X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=security%2Fselinux%2Fhooks.c;h=d9604794a4d2327eaee052a499b80458f1d4c023;hb=95c14904b6f6f8a35365f0c58d530c85b4fb96b4;hp=04acb5af831749652b3aa41db0412c8706cea4c9;hpb=3898b1b4ebff8dcfbcf1807e0661585e06c9a91c;p=safe%2Fjmp%2Flinux-2.6 diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 04acb5a..d960479 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -9,7 +9,8 @@ * James Morris * * Copyright (C) 2001,2002 Networks Associates Technology, Inc. - * Copyright (C) 2003 Red Hat, Inc., James Morris + * Copyright (C) 2003-2008 Red Hat, Inc., James Morris + * Eric Paris * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. * * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. @@ -24,7 +25,7 @@ #include #include -#include +#include #include #include #include @@ -39,11 +40,10 @@ #include #include #include +#include #include #include -#include #include -#include #include #include #include @@ -52,7 +52,7 @@ #include /* struct or_callable used in sock_rcv_skb */ #include #include -#include +#include #include #include #include @@ -75,6 +75,7 @@ #include #include #include +#include #include "avc.h" #include "objsec.h" @@ -88,7 +89,7 @@ #define XATTR_SELINUX_SUFFIX "selinux" #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX -#define NUM_SEL_MNT_OPTS 4 +#define NUM_SEL_MNT_OPTS 5 extern unsigned int policydb_loaded_version; extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); @@ -103,7 +104,9 @@ int selinux_enforcing; static int __init enforcing_setup(char *str) { - selinux_enforcing = simple_strtol(str, NULL, 0); + unsigned long enforcing; + if (!strict_strtoul(str, 0, &enforcing)) + selinux_enforcing = enforcing ? 1 : 0; return 1; } __setup("enforcing=", enforcing_setup); @@ -114,7 +117,9 @@ int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; static int __init selinux_enabled_setup(char *str) { - selinux_enabled = simple_strtol(str, NULL, 0); + unsigned long enabled; + if (!strict_strtoul(str, 0, &enabled)) + selinux_enabled = enabled ? 1 : 0; return 1; } __setup("selinux=", selinux_enabled_setup); @@ -122,13 +127,11 @@ __setup("selinux=", selinux_enabled_setup); int selinux_enabled = 1; #endif -/* Original (dummy) security module. */ -static struct security_operations *original_ops; -/* Minimal support for a secondary security module, - just to allow the use of the dummy or capability modules. - The owlsm module can alternatively be used as a secondary - module as long as CONFIG_OWLSM_FD is not enabled. */ +/* + * Minimal support for a secondary security module, + * just to allow the use of the capability module. + */ static struct security_operations *secondary_ops; /* Lists of inode and superblock security structures initialized @@ -153,33 +156,62 @@ static int selinux_secmark_enabled(void) return (atomic_read(&selinux_secmark_refcount) > 0); } -/* Allocate and free functions for each kind of security blob. */ - -static int task_alloc_security(struct task_struct *task) +/* + * initialise the security for the init task + */ +static void cred_init_security(void) { + struct cred *cred = (struct cred *) current->real_cred; struct task_security_struct *tsec; tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); if (!tsec) - return -ENOMEM; + panic("SELinux: Failed to initialize initial task.\n"); - tsec->osid = tsec->sid = SECINITSID_UNLABELED; - task->security = tsec; + tsec->osid = tsec->sid = SECINITSID_KERNEL; + cred->security = tsec; +} - return 0; +/* + * get the security ID of a set of credentials + */ +static inline u32 cred_sid(const struct cred *cred) +{ + const struct task_security_struct *tsec; + + tsec = cred->security; + return tsec->sid; } -static void task_free_security(struct task_struct *task) +/* + * get the objective security ID of a task + */ +static inline u32 task_sid(const struct task_struct *task) { - struct task_security_struct *tsec = task->security; - task->security = NULL; - kfree(tsec); + u32 sid; + + rcu_read_lock(); + sid = cred_sid(__task_cred(task)); + rcu_read_unlock(); + return sid; +} + +/* + * get the subjective security ID of the current task + */ +static inline u32 current_sid(void) +{ + const struct task_security_struct *tsec = current_cred()->security; + + return tsec->sid; } +/* Allocate and free functions for each kind of security blob. */ + static int inode_alloc_security(struct inode *inode) { - struct task_security_struct *tsec = current->security; struct inode_security_struct *isec; + u32 sid = current_sid(); isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); if (!isec) @@ -190,7 +222,7 @@ static int inode_alloc_security(struct inode *inode) isec->inode = inode; isec->sid = SECINITSID_UNLABELED; isec->sclass = SECCLASS_FILE; - isec->task_sid = tsec->sid; + isec->task_sid = sid; inode->i_security = isec; return 0; @@ -212,15 +244,15 @@ static void inode_free_security(struct inode *inode) static int file_alloc_security(struct file *file) { - struct task_security_struct *tsec = current->security; struct file_security_struct *fsec; + u32 sid = current_sid(); fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); if (!fsec) return -ENOMEM; - fsec->sid = tsec->sid; - fsec->fown_sid = tsec->sid; + fsec->sid = sid; + fsec->fown_sid = sid; file->f_security = fsec; return 0; @@ -289,6 +321,7 @@ static void sk_free_security(struct sock *sk) struct sk_security_struct *ssec = sk->sk_security; sk->sk_security = NULL; + selinux_netlbl_sk_security_free(ssec); kfree(ssec); } @@ -320,13 +353,15 @@ enum { Opt_fscontext = 2, Opt_defcontext = 3, Opt_rootcontext = 4, + Opt_labelsupport = 5, }; -static match_table_t tokens = { +static const match_table_t tokens = { {Opt_context, CONTEXT_STR "%s"}, {Opt_fscontext, FSCONTEXT_STR "%s"}, {Opt_defcontext, DEFCONTEXT_STR "%s"}, {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, + {Opt_labelsupport, LABELSUPP_STR}, {Opt_error, NULL}, }; @@ -334,8 +369,9 @@ static match_table_t tokens = { static int may_context_mount_sb_relabel(u32 sid, struct superblock_security_struct *sbsec, - struct task_security_struct *tsec) + const struct cred *cred) { + const struct task_security_struct *tsec = cred->security; int rc; rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, @@ -350,8 +386,9 @@ static int may_context_mount_sb_relabel(u32 sid, static int may_context_mount_inode_relabel(u32 sid, struct superblock_security_struct *sbsec, - struct task_security_struct *tsec) + const struct cred *cred) { + const struct task_security_struct *tsec = cred->security; int rc; rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, FILESYSTEM__RELABELFROM, NULL); @@ -396,7 +433,7 @@ static int sb_finish_set_opts(struct super_block *sb) } } - sbsec->initialized = 1; + sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP); if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", @@ -406,6 +443,12 @@ static int sb_finish_set_opts(struct super_block *sb) sb->s_id, sb->s_type->name, labeling_behaviors[sbsec->behavior-1]); + if (sbsec->behavior == SECURITY_FS_USE_GENFS || + sbsec->behavior == SECURITY_FS_USE_MNTPOINT || + sbsec->behavior == SECURITY_FS_USE_NONE || + sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) + sbsec->flags &= ~SE_SBLABELSUPP; + /* Initialize the root inode. */ rc = inode_doinit_with_dentry(root_inode, root); @@ -452,23 +495,22 @@ static int selinux_get_mnt_opts(const struct super_block *sb, security_init_mnt_opts(opts); - if (!sbsec->initialized) + if (!(sbsec->flags & SE_SBINITIALIZED)) return -EINVAL; if (!ss_initialized) return -EINVAL; - /* - * if we ever use sbsec flags for anything other than tracking mount - * settings this is going to need a mask - */ - tmp = sbsec->flags; + tmp = sbsec->flags & SE_MNTMASK; /* count the number of mount options for this sb */ for (i = 0; i < 8; i++) { if (tmp & 0x01) opts->num_mnt_opts++; tmp >>= 1; } + /* Check if the Label support flag is set */ + if (sbsec->flags & SE_SBLABELSUPP) + opts->num_mnt_opts++; opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); if (!opts->mnt_opts) { @@ -514,6 +556,10 @@ static int selinux_get_mnt_opts(const struct super_block *sb, opts->mnt_opts[i] = context; opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; } + if (sbsec->flags & SE_SBLABELSUPP) { + opts->mnt_opts[i] = NULL; + opts->mnt_opts_flags[i++] = SE_SBLABELSUPP; + } BUG_ON(i != opts->num_mnt_opts); @@ -527,8 +573,10 @@ out_free: static int bad_option(struct superblock_security_struct *sbsec, char flag, u32 old_sid, u32 new_sid) { + char mnt_flags = sbsec->flags & SE_MNTMASK; + /* check if the old mount command had the same options */ - if (sbsec->initialized) + if (sbsec->flags & SE_SBINITIALIZED) if (!(sbsec->flags & flag) || (old_sid != new_sid)) return 1; @@ -536,8 +584,8 @@ static int bad_option(struct superblock_security_struct *sbsec, char flag, /* check if we were passed the same options twice, * aka someone passed context=a,context=b */ - if (!sbsec->initialized) - if (sbsec->flags & flag) + if (!(sbsec->flags & SE_SBINITIALIZED)) + if (mnt_flags & flag) return 1; return 0; } @@ -549,8 +597,8 @@ static int bad_option(struct superblock_security_struct *sbsec, char flag, static int selinux_set_mnt_opts(struct super_block *sb, struct security_mnt_opts *opts) { + const struct cred *cred = current_cred(); int rc = 0, i; - struct task_security_struct *tsec = current->security; struct superblock_security_struct *sbsec = sb->s_security; const char *name = sb->s_type->name; struct inode *inode = sbsec->sb->s_root->d_inode; @@ -591,9 +639,9 @@ static int selinux_set_mnt_opts(struct super_block *sb, * this sb does not set any security options. (The first options * will be used for both mounts) */ - if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) + if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) && (num_opts == 0)) - goto out; + goto out; /* * parse the mount options, check if they are valid sids. @@ -602,6 +650,9 @@ static int selinux_set_mnt_opts(struct super_block *sb, */ for (i = 0; i < num_opts; i++) { u32 sid; + + if (flags[i] == SE_SBLABELSUPP) + continue; rc = security_context_to_sid(mount_options[i], strlen(mount_options[i]), &sid); if (rc) { @@ -655,19 +706,19 @@ static int selinux_set_mnt_opts(struct super_block *sb, } } - if (sbsec->initialized) { + if (sbsec->flags & SE_SBINITIALIZED) { /* previously mounted with options, but not on this attempt? */ - if (sbsec->flags && !num_opts) + if ((sbsec->flags & SE_MNTMASK) && !num_opts) goto out_double_mount; rc = 0; goto out; } if (strcmp(sb->s_type->name, "proc") == 0) - sbsec->proc = 1; + sbsec->flags |= SE_SBPROC; /* Determine the labeling behavior to use for this filesystem type. */ - rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); + rc = security_fs_use((sbsec->flags & SE_SBPROC) ? "proc" : sb->s_type->name, &sbsec->behavior, &sbsec->sid); if (rc) { printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", __func__, sb->s_type->name, rc); @@ -676,8 +727,7 @@ static int selinux_set_mnt_opts(struct super_block *sb, /* sets the context of the superblock for the fs being mounted. */ if (fscontext_sid) { - - rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec); + rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); if (rc) goto out; @@ -691,12 +741,14 @@ static int selinux_set_mnt_opts(struct super_block *sb, */ if (context_sid) { if (!fscontext_sid) { - rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec); + rc = may_context_mount_sb_relabel(context_sid, sbsec, + cred); if (rc) goto out; sbsec->sid = context_sid; } else { - rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec); + rc = may_context_mount_inode_relabel(context_sid, sbsec, + cred); if (rc) goto out; } @@ -708,7 +760,8 @@ static int selinux_set_mnt_opts(struct super_block *sb, } if (rootcontext_sid) { - rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec); + rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, + cred); if (rc) goto out; @@ -726,7 +779,7 @@ static int selinux_set_mnt_opts(struct super_block *sb, if (defcontext_sid != sbsec->def_sid) { rc = may_context_mount_inode_relabel(defcontext_sid, - sbsec, tsec); + sbsec, cred); if (rc) goto out; } @@ -769,10 +822,10 @@ static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, } /* how can we clone if the old one wasn't set up?? */ - BUG_ON(!oldsbsec->initialized); + BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED)); /* if fs is reusing a sb, just let its options stand... */ - if (newsbsec->initialized) + if (newsbsec->flags & SE_SBINITIALIZED) return; mutex_lock(&newsbsec->lock); @@ -880,7 +933,8 @@ static int selinux_parse_opts_str(char *options, goto out_err; } break; - + case Opt_labelsupport: + break; default: rc = -EINVAL; printk(KERN_WARNING "SELinux: unknown mount option\n"); @@ -955,6 +1009,71 @@ out_err: return rc; } +static void selinux_write_opts(struct seq_file *m, + struct security_mnt_opts *opts) +{ + int i; + char *prefix; + + for (i = 0; i < opts->num_mnt_opts; i++) { + char *has_comma; + + if (opts->mnt_opts[i]) + has_comma = strchr(opts->mnt_opts[i], ','); + else + has_comma = NULL; + + switch (opts->mnt_opts_flags[i]) { + case CONTEXT_MNT: + prefix = CONTEXT_STR; + break; + case FSCONTEXT_MNT: + prefix = FSCONTEXT_STR; + break; + case ROOTCONTEXT_MNT: + prefix = ROOTCONTEXT_STR; + break; + case DEFCONTEXT_MNT: + prefix = DEFCONTEXT_STR; + break; + case SE_SBLABELSUPP: + seq_putc(m, ','); + seq_puts(m, LABELSUPP_STR); + continue; + default: + BUG(); + }; + /* we need a comma before each option */ + seq_putc(m, ','); + seq_puts(m, prefix); + if (has_comma) + seq_putc(m, '\"'); + seq_puts(m, opts->mnt_opts[i]); + if (has_comma) + seq_putc(m, '\"'); + } +} + +static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) +{ + struct security_mnt_opts opts; + int rc; + + rc = selinux_get_mnt_opts(sb, &opts); + if (rc) { + /* before policy load we may get EINVAL, don't show anything */ + if (rc == -EINVAL) + rc = 0; + return rc; + } + + selinux_write_opts(m, &opts); + + security_free_mnt_opts(&opts); + + return rc; +} + static inline u16 inode_mode_to_security_class(umode_t mode) { switch (mode & S_IFMT) { @@ -1116,7 +1235,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent goto out_unlock; sbsec = inode->i_sb->s_security; - if (!sbsec->initialized) { + if (!(sbsec->flags & SE_SBINITIALIZED)) { /* Defer initialization until selinux_complete_init, after the initial policy is loaded and the security server is ready to handle calls. */ @@ -1233,7 +1352,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent /* Default to the fs superblock SID. */ isec->sid = sbsec->sid; - if (sbsec->proc) { + if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) { struct proc_inode *proci = PROC_I(inode); if (proci->pde) { isec->sclass = inode_mode_to_security_class(inode->i_mode); @@ -1285,18 +1404,53 @@ static inline u32 signal_to_av(int sig) return perm; } -/* Check permission betweeen a pair of tasks, e.g. signal checks, - fork check, ptrace check, etc. */ -static int task_has_perm(struct task_struct *tsk1, - struct task_struct *tsk2, +/* + * Check permission between a pair of credentials + * fork check, ptrace check, etc. + */ +static int cred_has_perm(const struct cred *actor, + const struct cred *target, + u32 perms) +{ + u32 asid = cred_sid(actor), tsid = cred_sid(target); + + return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); +} + +/* + * Check permission between a pair of tasks, e.g. signal checks, + * fork check, ptrace check, etc. + * tsk1 is the actor and tsk2 is the target + * - this uses the default subjective creds of tsk1 + */ +static int task_has_perm(const struct task_struct *tsk1, + const struct task_struct *tsk2, u32 perms) { - struct task_security_struct *tsec1, *tsec2; + const struct task_security_struct *__tsec1, *__tsec2; + u32 sid1, sid2; - tsec1 = tsk1->security; - tsec2 = tsk2->security; - return avc_has_perm(tsec1->sid, tsec2->sid, - SECCLASS_PROCESS, perms, NULL); + rcu_read_lock(); + __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; + __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; + rcu_read_unlock(); + return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); +} + +/* + * Check permission between current and another task, e.g. signal checks, + * fork check, ptrace check, etc. + * current is the actor and tsk2 is the target + * - this uses current's subjective creds + */ +static int current_has_perm(const struct task_struct *tsk, + u32 perms) +{ + u32 sid, tsid; + + sid = current_sid(); + tsid = task_sid(tsk); + return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL); } #if CAP_LAST_CAP > 63 @@ -1305,14 +1459,15 @@ static int task_has_perm(struct task_struct *tsk1, /* Check whether a task is allowed to use a capability. */ static int task_has_capability(struct task_struct *tsk, - int cap) + const struct cred *cred, + int cap, int audit) { - struct task_security_struct *tsec; struct avc_audit_data ad; + struct av_decision avd; u16 sclass; + u32 sid = cred_sid(cred); u32 av = CAP_TO_MASK(cap); - - tsec = tsk->security; + int rc; AVC_AUDIT_DATA_INIT(&ad, CAP); ad.tsk = tsk; @@ -1330,37 +1485,39 @@ static int task_has_capability(struct task_struct *tsk, "SELinux: out of range capability %d\n", cap); BUG(); } - return avc_has_perm(tsec->sid, tsec->sid, sclass, av, &ad); + + rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); + if (audit == SECURITY_CAP_AUDIT) + avc_audit(sid, sid, sclass, av, &avd, rc, &ad); + return rc; } /* Check whether a task is allowed to use a system operation. */ static int task_has_system(struct task_struct *tsk, u32 perms) { - struct task_security_struct *tsec; - - tsec = tsk->security; + u32 sid = task_sid(tsk); - return avc_has_perm(tsec->sid, SECINITSID_KERNEL, + return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM, perms, NULL); } /* Check whether a task has a particular permission to an inode. The 'adp' parameter is optional and allows other audit data to be passed (e.g. the dentry). */ -static int inode_has_perm(struct task_struct *tsk, +static int inode_has_perm(const struct cred *cred, struct inode *inode, u32 perms, struct avc_audit_data *adp) { - struct task_security_struct *tsec; struct inode_security_struct *isec; struct avc_audit_data ad; + u32 sid; if (unlikely(IS_PRIVATE(inode))) return 0; - tsec = tsk->security; + sid = cred_sid(cred); isec = inode->i_security; if (!adp) { @@ -1369,23 +1526,24 @@ static int inode_has_perm(struct task_struct *tsk, ad.u.fs.inode = inode; } - return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); + return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp); } /* Same as inode_has_perm, but pass explicit audit data containing the dentry to help the auditing code to more easily generate the pathname if needed. */ -static inline int dentry_has_perm(struct task_struct *tsk, +static inline int dentry_has_perm(const struct cred *cred, struct vfsmount *mnt, struct dentry *dentry, u32 av) { struct inode *inode = dentry->d_inode; struct avc_audit_data ad; + AVC_AUDIT_DATA_INIT(&ad, FS); ad.u.fs.path.mnt = mnt; ad.u.fs.path.dentry = dentry; - return inode_has_perm(tsk, inode, av, &ad); + return inode_has_perm(cred, inode, av, &ad); } /* Check whether a task can use an open file descriptor to @@ -1396,33 +1554,35 @@ static inline int dentry_has_perm(struct task_struct *tsk, has the same SID as the process. If av is zero, then access to the file is not checked, e.g. for cases where only the descriptor is affected like seek. */ -static int file_has_perm(struct task_struct *tsk, - struct file *file, - u32 av) +static int file_has_perm(const struct cred *cred, + struct file *file, + u32 av) { - struct task_security_struct *tsec = tsk->security; struct file_security_struct *fsec = file->f_security; struct inode *inode = file->f_path.dentry->d_inode; struct avc_audit_data ad; + u32 sid = cred_sid(cred); int rc; AVC_AUDIT_DATA_INIT(&ad, FS); ad.u.fs.path = file->f_path; - if (tsec->sid != fsec->sid) { - rc = avc_has_perm(tsec->sid, fsec->sid, + if (sid != fsec->sid) { + rc = avc_has_perm(sid, fsec->sid, SECCLASS_FD, FD__USE, &ad); if (rc) - return rc; + goto out; } /* av is zero if only checking access to the descriptor. */ + rc = 0; if (av) - return inode_has_perm(tsk, inode, av, &ad); + rc = inode_has_perm(cred, inode, av, &ad); - return 0; +out: + return rc; } /* Check whether a task can create a file. */ @@ -1430,36 +1590,36 @@ static int may_create(struct inode *dir, struct dentry *dentry, u16 tclass) { - struct task_security_struct *tsec; + const struct cred *cred = current_cred(); + const struct task_security_struct *tsec = cred->security; struct inode_security_struct *dsec; struct superblock_security_struct *sbsec; - u32 newsid; + u32 sid, newsid; struct avc_audit_data ad; int rc; - tsec = current->security; dsec = dir->i_security; sbsec = dir->i_sb->s_security; + sid = tsec->sid; + newsid = tsec->create_sid; + AVC_AUDIT_DATA_INIT(&ad, FS); ad.u.fs.path.dentry = dentry; - rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, + rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, DIR__ADD_NAME | DIR__SEARCH, &ad); if (rc) return rc; - if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { - newsid = tsec->create_sid; - } else { - rc = security_transition_sid(tsec->sid, dsec->sid, tclass, - &newsid); + if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { + rc = security_transition_sid(sid, dsec->sid, tclass, &newsid); if (rc) return rc; } - rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); + rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); if (rc) return rc; @@ -1472,11 +1632,9 @@ static int may_create(struct inode *dir, static int may_create_key(u32 ksid, struct task_struct *ctx) { - struct task_security_struct *tsec; - - tsec = ctx->security; + u32 sid = task_sid(ctx); - return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); + return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); } #define MAY_LINK 0 @@ -1489,13 +1647,12 @@ static int may_link(struct inode *dir, int kind) { - struct task_security_struct *tsec; struct inode_security_struct *dsec, *isec; struct avc_audit_data ad; + u32 sid = current_sid(); u32 av; int rc; - tsec = current->security; dsec = dir->i_security; isec = dentry->d_inode->i_security; @@ -1504,7 +1661,7 @@ static int may_link(struct inode *dir, av = DIR__SEARCH; av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); - rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); + rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); if (rc) return rc; @@ -1524,7 +1681,7 @@ static int may_link(struct inode *dir, return 0; } - rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); + rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); return rc; } @@ -1533,14 +1690,13 @@ static inline int may_rename(struct inode *old_dir, struct inode *new_dir, struct dentry *new_dentry) { - struct task_security_struct *tsec; struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; struct avc_audit_data ad; + u32 sid = current_sid(); u32 av; int old_is_dir, new_is_dir; int rc; - tsec = current->security; old_dsec = old_dir->i_security; old_isec = old_dentry->d_inode->i_security; old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); @@ -1549,16 +1705,16 @@ static inline int may_rename(struct inode *old_dir, AVC_AUDIT_DATA_INIT(&ad, FS); ad.u.fs.path.dentry = old_dentry; - rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, + rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, DIR__REMOVE_NAME | DIR__SEARCH, &ad); if (rc) return rc; - rc = avc_has_perm(tsec->sid, old_isec->sid, + rc = avc_has_perm(sid, old_isec->sid, old_isec->sclass, FILE__RENAME, &ad); if (rc) return rc; if (old_is_dir && new_dir != old_dir) { - rc = avc_has_perm(tsec->sid, old_isec->sid, + rc = avc_has_perm(sid, old_isec->sid, old_isec->sclass, DIR__REPARENT, &ad); if (rc) return rc; @@ -1568,13 +1724,13 @@ static inline int may_rename(struct inode *old_dir, av = DIR__ADD_NAME | DIR__SEARCH; if (new_dentry->d_inode) av |= DIR__REMOVE_NAME; - rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); + rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); if (rc) return rc; if (new_dentry->d_inode) { new_isec = new_dentry->d_inode->i_security; new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); - rc = avc_has_perm(tsec->sid, new_isec->sid, + rc = avc_has_perm(sid, new_isec->sid, new_isec->sclass, (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); if (rc) @@ -1585,18 +1741,16 @@ static inline int may_rename(struct inode *old_dir, } /* Check whether a task can perform a filesystem operation. */ -static int superblock_has_perm(struct task_struct *tsk, +static int superblock_has_perm(const struct cred *cred, struct super_block *sb, u32 perms, struct avc_audit_data *ad) { - struct task_security_struct *tsec; struct superblock_security_struct *sbsec; + u32 sid = cred_sid(cred); - tsec = tsk->security; sbsec = sb->s_security; - return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, - perms, ad); + return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); } /* Convert a Linux mode and permission mask to an access vector. */ @@ -1627,15 +1781,39 @@ static inline u32 file_mask_to_av(int mode, int mask) return av; } +/* Convert a Linux file to an access vector. */ +static inline u32 file_to_av(struct file *file) +{ + u32 av = 0; + + if (file->f_mode & FMODE_READ) + av |= FILE__READ; + if (file->f_mode & FMODE_WRITE) { + if (file->f_flags & O_APPEND) + av |= FILE__APPEND; + else + av |= FILE__WRITE; + } + if (!av) { + /* + * Special file opened with flags 3 for ioctl-only use. + */ + av = FILE__IOCTL; + } + + return av; +} + /* - * Convert a file mask to an access vector and include the correct open + * Convert a file to an access vector and include the correct open * open permission. */ -static inline u32 open_file_mask_to_av(int mode, int mask) +static inline u32 open_file_to_av(struct file *file) { - u32 av = file_mask_to_av(mode, mask); + u32 av = file_to_av(file); if (selinux_policycap_openperm) { + mode_t mode = file->f_path.dentry->d_inode->i_mode; /* * lnk files and socks do not really have an 'open' */ @@ -1651,45 +1829,40 @@ static inline u32 open_file_mask_to_av(int mode, int mask) av |= DIR__OPEN; else printk(KERN_ERR "SELinux: WARNING: inside %s with " - "unknown mode:%x\n", __func__, mode); + "unknown mode:%o\n", __func__, mode); } return av; } -/* Convert a Linux file to an access vector. */ -static inline u32 file_to_av(struct file *file) +/* Hook functions begin here. */ + +static int selinux_ptrace_may_access(struct task_struct *child, + unsigned int mode) { - u32 av = 0; + int rc; - if (file->f_mode & FMODE_READ) - av |= FILE__READ; - if (file->f_mode & FMODE_WRITE) { - if (file->f_flags & O_APPEND) - av |= FILE__APPEND; - else - av |= FILE__WRITE; - } - if (!av) { - /* - * Special file opened with flags 3 for ioctl-only use. - */ - av = FILE__IOCTL; + rc = secondary_ops->ptrace_may_access(child, mode); + if (rc) + return rc; + + if (mode == PTRACE_MODE_READ) { + u32 sid = current_sid(); + u32 csid = task_sid(child); + return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); } - return av; + return current_has_perm(child, PROCESS__PTRACE); } -/* Hook functions begin here. */ - -static int selinux_ptrace(struct task_struct *parent, struct task_struct *child) +static int selinux_ptrace_traceme(struct task_struct *parent) { int rc; - rc = secondary_ops->ptrace(parent, child); + rc = secondary_ops->ptrace_traceme(parent); if (rc) return rc; - return task_has_perm(parent, child, PROCESS__PTRACE); + return task_has_perm(parent, current, PROCESS__PTRACE); } static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, @@ -1697,40 +1870,38 @@ static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, { int error; - error = task_has_perm(current, target, PROCESS__GETCAP); + error = current_has_perm(target, PROCESS__GETCAP); if (error) return error; return secondary_ops->capget(target, effective, inheritable, permitted); } -static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, - kernel_cap_t *inheritable, kernel_cap_t *permitted) +static int selinux_capset(struct cred *new, const struct cred *old, + const kernel_cap_t *effective, + const kernel_cap_t *inheritable, + const kernel_cap_t *permitted) { int error; - error = secondary_ops->capset_check(target, effective, inheritable, permitted); + error = secondary_ops->capset(new, old, + effective, inheritable, permitted); if (error) return error; - return task_has_perm(current, target, PROCESS__SETCAP); -} - -static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, - kernel_cap_t *inheritable, kernel_cap_t *permitted) -{ - secondary_ops->capset_set(target, effective, inheritable, permitted); + return cred_has_perm(old, new, PROCESS__SETCAP); } -static int selinux_capable(struct task_struct *tsk, int cap) +static int selinux_capable(struct task_struct *tsk, const struct cred *cred, + int cap, int audit) { int rc; - rc = secondary_ops->capable(tsk, cap); + rc = secondary_ops->capable(tsk, cred, cap, audit); if (rc) return rc; - return task_has_capability(tsk, cap); + return task_has_capability(tsk, cred, cap, audit); } static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) @@ -1778,15 +1949,14 @@ static int selinux_sysctl(ctl_table *table, int op) { int error = 0; u32 av; - struct task_security_struct *tsec; - u32 tsid; + u32 tsid, sid; int rc; rc = secondary_ops->sysctl(table, op); if (rc) return rc; - tsec = current->security; + sid = current_sid(); rc = selinux_sysctl_get_sid(table, (op == 0001) ? SECCLASS_DIR : SECCLASS_FILE, &tsid); @@ -1798,7 +1968,7 @@ static int selinux_sysctl(ctl_table *table, int op) /* The op values are "defined" in sysctl.c, thereby creating * a bad coupling between this module and sysctl.c */ if (op == 001) { - error = avc_has_perm(tsec->sid, tsid, + error = avc_has_perm(sid, tsid, SECCLASS_DIR, DIR__SEARCH, NULL); } else { av = 0; @@ -1807,7 +1977,7 @@ static int selinux_sysctl(ctl_table *table, int op) if (op & 002) av |= FILE__WRITE; if (av) - error = avc_has_perm(tsec->sid, tsid, + error = avc_has_perm(sid, tsid, SECCLASS_FILE, av, NULL); } @@ -1816,6 +1986,7 @@ static int selinux_sysctl(ctl_table *table, int op) static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) { + const struct cred *cred = current_cred(); int rc = 0; if (!sb) @@ -1827,14 +1998,12 @@ static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) case Q_QUOTAOFF: case Q_SETINFO: case Q_SETQUOTA: - rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAMOD, - NULL); + rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); break; case Q_GETFMT: case Q_GETINFO: case Q_GETQUOTA: - rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAGET, - NULL); + rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); break; default: rc = 0; /* let the kernel handle invalid cmds */ @@ -1845,7 +2014,9 @@ static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) static int selinux_quota_on(struct dentry *dentry) { - return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON); } static int selinux_syslog(int type) @@ -1893,93 +2064,56 @@ static int selinux_syslog(int type) static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) { int rc, cap_sys_admin = 0; - struct task_security_struct *tsec = current->security; - - rc = secondary_ops->capable(current, CAP_SYS_ADMIN); - if (rc == 0) - rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, - SECCLASS_CAPABILITY, - CAP_TO_MASK(CAP_SYS_ADMIN), - 0, - NULL); + rc = selinux_capable(current, current_cred(), CAP_SYS_ADMIN, + SECURITY_CAP_NOAUDIT); if (rc == 0) cap_sys_admin = 1; return __vm_enough_memory(mm, pages, cap_sys_admin); } -/** - * task_tracer_task - return the task that is tracing the given task - * @task: task to consider - * - * Returns NULL if noone is tracing @task, or the &struct task_struct - * pointer to its tracer. - * - * Must be called under rcu_read_lock(). - */ -static struct task_struct *task_tracer_task(struct task_struct *task) -{ - if (task->ptrace & PT_PTRACED) - return rcu_dereference(task->parent); - return NULL; -} - /* binprm security operations */ -static int selinux_bprm_alloc_security(struct linux_binprm *bprm) +static int selinux_bprm_set_creds(struct linux_binprm *bprm) { - struct bprm_security_struct *bsec; - - bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); - if (!bsec) - return -ENOMEM; - - bsec->sid = SECINITSID_UNLABELED; - bsec->set = 0; - - bprm->security = bsec; - return 0; -} - -static int selinux_bprm_set_security(struct linux_binprm *bprm) -{ - struct task_security_struct *tsec; - struct inode *inode = bprm->file->f_path.dentry->d_inode; + const struct task_security_struct *old_tsec; + struct task_security_struct *new_tsec; struct inode_security_struct *isec; - struct bprm_security_struct *bsec; - u32 newsid; struct avc_audit_data ad; + struct inode *inode = bprm->file->f_path.dentry->d_inode; int rc; - rc = secondary_ops->bprm_set_security(bprm); + rc = secondary_ops->bprm_set_creds(bprm); if (rc) return rc; - bsec = bprm->security; - - if (bsec->set) + /* SELinux context only depends on initial program or script and not + * the script interpreter */ + if (bprm->cred_prepared) return 0; - tsec = current->security; + old_tsec = current_security(); + new_tsec = bprm->cred->security; isec = inode->i_security; /* Default to the current task SID. */ - bsec->sid = tsec->sid; + new_tsec->sid = old_tsec->sid; + new_tsec->osid = old_tsec->sid; /* Reset fs, key, and sock SIDs on execve. */ - tsec->create_sid = 0; - tsec->keycreate_sid = 0; - tsec->sockcreate_sid = 0; + new_tsec->create_sid = 0; + new_tsec->keycreate_sid = 0; + new_tsec->sockcreate_sid = 0; - if (tsec->exec_sid) { - newsid = tsec->exec_sid; + if (old_tsec->exec_sid) { + new_tsec->sid = old_tsec->exec_sid; /* Reset exec SID on execve. */ - tsec->exec_sid = 0; + new_tsec->exec_sid = 0; } else { /* Check for a default transition on this program. */ - rc = security_transition_sid(tsec->sid, isec->sid, - SECCLASS_PROCESS, &newsid); + rc = security_transition_sid(old_tsec->sid, isec->sid, + SECCLASS_PROCESS, &new_tsec->sid); if (rc) return rc; } @@ -1988,70 +2122,94 @@ static int selinux_bprm_set_security(struct linux_binprm *bprm) ad.u.fs.path = bprm->file->f_path; if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) - newsid = tsec->sid; + new_tsec->sid = old_tsec->sid; - if (tsec->sid == newsid) { - rc = avc_has_perm(tsec->sid, isec->sid, + if (new_tsec->sid == old_tsec->sid) { + rc = avc_has_perm(old_tsec->sid, isec->sid, SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); if (rc) return rc; } else { /* Check permissions for the transition. */ - rc = avc_has_perm(tsec->sid, newsid, + rc = avc_has_perm(old_tsec->sid, new_tsec->sid, SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); if (rc) return rc; - rc = avc_has_perm(newsid, isec->sid, + rc = avc_has_perm(new_tsec->sid, isec->sid, SECCLASS_FILE, FILE__ENTRYPOINT, &ad); if (rc) return rc; - /* Clear any possibly unsafe personality bits on exec: */ - current->personality &= ~PER_CLEAR_ON_SETID; + /* Check for shared state */ + if (bprm->unsafe & LSM_UNSAFE_SHARE) { + rc = avc_has_perm(old_tsec->sid, new_tsec->sid, + SECCLASS_PROCESS, PROCESS__SHARE, + NULL); + if (rc) + return -EPERM; + } + + /* Make sure that anyone attempting to ptrace over a task that + * changes its SID has the appropriate permit */ + if (bprm->unsafe & + (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { + struct task_struct *tracer; + struct task_security_struct *sec; + u32 ptsid = 0; + + rcu_read_lock(); + tracer = tracehook_tracer_task(current); + if (likely(tracer != NULL)) { + sec = __task_cred(tracer)->security; + ptsid = sec->sid; + } + rcu_read_unlock(); - /* Set the security field to the new SID. */ - bsec->sid = newsid; + if (ptsid != 0) { + rc = avc_has_perm(ptsid, new_tsec->sid, + SECCLASS_PROCESS, + PROCESS__PTRACE, NULL); + if (rc) + return -EPERM; + } + } + + /* Clear any possibly unsafe personality bits on exec: */ + bprm->per_clear |= PER_CLEAR_ON_SETID; } - bsec->set = 1; return 0; } -static int selinux_bprm_check_security(struct linux_binprm *bprm) -{ - return secondary_ops->bprm_check_security(bprm); -} - - static int selinux_bprm_secureexec(struct linux_binprm *bprm) { - struct task_security_struct *tsec = current->security; + const struct cred *cred = current_cred(); + const struct task_security_struct *tsec = cred->security; + u32 sid, osid; int atsecure = 0; - if (tsec->osid != tsec->sid) { + sid = tsec->sid; + osid = tsec->osid; + + if (osid != sid) { /* Enable secure mode for SIDs transitions unless the noatsecure permission is granted between the two SIDs, i.e. ahp returns 0. */ - atsecure = avc_has_perm(tsec->osid, tsec->sid, - SECCLASS_PROCESS, - PROCESS__NOATSECURE, NULL); + atsecure = avc_has_perm(osid, sid, + SECCLASS_PROCESS, + PROCESS__NOATSECURE, NULL); } return (atsecure || secondary_ops->bprm_secureexec(bprm)); } -static void selinux_bprm_free_security(struct linux_binprm *bprm) -{ - kfree(bprm->security); - bprm->security = NULL; -} - extern struct vfsmount *selinuxfs_mount; extern struct dentry *selinux_null; /* Derived from fs/exec.c:flush_old_files. */ -static inline void flush_unauthorized_files(struct files_struct *files) +static inline void flush_unauthorized_files(const struct cred *cred, + struct files_struct *files) { struct avc_audit_data ad; struct file *file, *devnull = NULL; @@ -2060,26 +2218,27 @@ static inline void flush_unauthorized_files(struct files_struct *files) long j = -1; int drop_tty = 0; - mutex_lock(&tty_mutex); tty = get_current_tty(); if (tty) { file_list_lock(); - file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list); - if (file) { + if (!list_empty(&tty->tty_files)) { + struct inode *inode; + /* Revalidate access to controlling tty. Use inode_has_perm on the tty inode directly rather than using file_has_perm, as this particular open file may belong to another process and we are only interested in the inode-based check here. */ - struct inode *inode = file->f_path.dentry->d_inode; - if (inode_has_perm(current, inode, + file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list); + inode = file->f_path.dentry->d_inode; + if (inode_has_perm(cred, inode, FILE__READ | FILE__WRITE, NULL)) { drop_tty = 1; } } file_list_unlock(); + tty_kref_put(tty); } - mutex_unlock(&tty_mutex); /* Reset controlling tty. */ if (drop_tty) no_tty(); @@ -2107,7 +2266,7 @@ static inline void flush_unauthorized_files(struct files_struct *files) file = fget(i); if (!file) continue; - if (file_has_perm(current, + if (file_has_perm(cred, file, file_to_av(file))) { sys_close(i); @@ -2121,7 +2280,10 @@ static inline void flush_unauthorized_files(struct files_struct *files) if (devnull) { get_file(devnull); } else { - devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); + devnull = dentry_open( + dget(selinux_null), + mntget(selinuxfs_mount), + O_RDWR, cred); if (IS_ERR(devnull)) { devnull = NULL; put_unused_fd(fd); @@ -2140,94 +2302,74 @@ static inline void flush_unauthorized_files(struct files_struct *files) spin_unlock(&files->file_lock); } -static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) +/* + * Prepare a process for imminent new credential changes due to exec + */ +static void selinux_bprm_committing_creds(struct linux_binprm *bprm) { - struct task_security_struct *tsec; - struct bprm_security_struct *bsec; - u32 sid; - int rc; - - secondary_ops->bprm_apply_creds(bprm, unsafe); - - tsec = current->security; - - bsec = bprm->security; - sid = bsec->sid; + struct task_security_struct *new_tsec; + struct rlimit *rlim, *initrlim; + int rc, i; - tsec->osid = tsec->sid; - bsec->unsafe = 0; - if (tsec->sid != sid) { - /* Check for shared state. If not ok, leave SID - unchanged and kill. */ - if (unsafe & LSM_UNSAFE_SHARE) { - rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, - PROCESS__SHARE, NULL); - if (rc) { - bsec->unsafe = 1; - return; - } - } + new_tsec = bprm->cred->security; + if (new_tsec->sid == new_tsec->osid) + return; - /* Check for ptracing, and update the task SID if ok. - Otherwise, leave SID unchanged and kill. */ - if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { - struct task_struct *tracer; - struct task_security_struct *sec; - u32 ptsid = 0; + /* Close files for which the new task SID is not authorized. */ + flush_unauthorized_files(bprm->cred, current->files); - rcu_read_lock(); - tracer = task_tracer_task(current); - if (likely(tracer != NULL)) { - sec = tracer->security; - ptsid = sec->sid; - } - rcu_read_unlock(); + /* Always clear parent death signal on SID transitions. */ + current->pdeath_signal = 0; - if (ptsid != 0) { - rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, - PROCESS__PTRACE, NULL); - if (rc) { - bsec->unsafe = 1; - return; - } - } + /* Check whether the new SID can inherit resource limits from the old + * SID. If not, reset all soft limits to the lower of the current + * task's hard limit and the init task's soft limit. + * + * Note that the setting of hard limits (even to lower them) can be + * controlled by the setrlimit check. The inclusion of the init task's + * soft limit into the computation is to avoid resetting soft limits + * higher than the default soft limit for cases where the default is + * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK. + */ + rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS, + PROCESS__RLIMITINH, NULL); + if (rc) { + for (i = 0; i < RLIM_NLIMITS; i++) { + rlim = current->signal->rlim + i; + initrlim = init_task.signal->rlim + i; + rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); } - tsec->sid = sid; + update_rlimit_cpu(rlim->rlim_cur); } } /* - * called after apply_creds without the task lock held + * Clean up the process immediately after the installation of new credentials + * due to exec */ -static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) +static void selinux_bprm_committed_creds(struct linux_binprm *bprm) { - struct task_security_struct *tsec; - struct rlimit *rlim, *initrlim; + const struct task_security_struct *tsec = current_security(); struct itimerval itimer; - struct bprm_security_struct *bsec; + struct sighand_struct *psig; + u32 osid, sid; int rc, i; + unsigned long flags; - tsec = current->security; - bsec = bprm->security; + osid = tsec->osid; + sid = tsec->sid; - if (bsec->unsafe) { - force_sig_specific(SIGKILL, current); - return; - } - if (tsec->osid == tsec->sid) + if (sid == osid) return; - /* Close files for which the new task SID is not authorized. */ - flush_unauthorized_files(current->files); - - /* Check whether the new SID can inherit signal state - from the old SID. If not, clear itimers to avoid - subsequent signal generation and flush and unblock - signals. This must occur _after_ the task SID has - been updated so that any kill done after the flush - will be checked against the new SID. */ - rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, - PROCESS__SIGINH, NULL); + /* Check whether the new SID can inherit signal state from the old SID. + * If not, clear itimers to avoid subsequent signal generation and + * flush and unblock signals. + * + * This must occur _after_ the task SID has been updated so that any + * kill done after the flush will be checked against the new SID. + */ + rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); if (rc) { memset(&itimer, 0, sizeof itimer); for (i = 0; i < 3; i++) @@ -2240,39 +2382,14 @@ static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) spin_unlock_irq(¤t->sighand->siglock); } - /* Always clear parent death signal on SID transitions. */ - current->pdeath_signal = 0; - - /* Check whether the new SID can inherit resource limits - from the old SID. If not, reset all soft limits to - the lower of the current task's hard limit and the init - task's soft limit. Note that the setting of hard limits - (even to lower them) can be controlled by the setrlimit - check. The inclusion of the init task's soft limit into - the computation is to avoid resetting soft limits higher - than the default soft limit for cases where the default - is lower than the hard limit, e.g. RLIMIT_CORE or - RLIMIT_STACK.*/ - rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, - PROCESS__RLIMITINH, NULL); - if (rc) { - for (i = 0; i < RLIM_NLIMITS; i++) { - rlim = current->signal->rlim + i; - initrlim = init_task.signal->rlim+i; - rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); - } - if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { - /* - * This will cause RLIMIT_CPU calculations - * to be refigured. - */ - current->it_prof_expires = jiffies_to_cputime(1); - } - } - - /* Wake up the parent if it is waiting so that it can - recheck wait permission to the new task SID. */ + /* Wake up the parent if it is waiting so that it can recheck + * wait permission to the new task SID. */ + read_lock_irq(&tasklist_lock); + psig = current->parent->sighand; + spin_lock_irqsave(&psig->siglock, flags); wake_up_interruptible(¤t->parent->signal->wait_chldexit); + spin_unlock_irqrestore(&psig->siglock, flags); + read_unlock_irq(&tasklist_lock); } /* superblock security operations */ @@ -2300,7 +2417,8 @@ static inline int selinux_option(char *option, int len) return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || - match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len)); + match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) || + match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len)); } static inline void take_option(char **to, char *from, int *first, int len) @@ -2377,8 +2495,9 @@ out: return rc; } -static int selinux_sb_kern_mount(struct super_block *sb, void *data) +static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data) { + const struct cred *cred = current_cred(); struct avc_audit_data ad; int rc; @@ -2386,18 +2505,23 @@ static int selinux_sb_kern_mount(struct super_block *sb, void *data) if (rc) return rc; + /* Allow all mounts performed by the kernel */ + if (flags & MS_KERNMOUNT) + return 0; + AVC_AUDIT_DATA_INIT(&ad, FS); ad.u.fs.path.dentry = sb->s_root; - return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); + return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); } static int selinux_sb_statfs(struct dentry *dentry) { + const struct cred *cred = current_cred(); struct avc_audit_data ad; AVC_AUDIT_DATA_INIT(&ad, FS); ad.u.fs.path.dentry = dentry->d_sb->s_root; - return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); + return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); } static int selinux_mount(char *dev_name, @@ -2406,29 +2530,21 @@ static int selinux_mount(char *dev_name, unsigned long flags, void *data) { - int rc; - - rc = secondary_ops->sb_mount(dev_name, path, type, flags, data); - if (rc) - return rc; + const struct cred *cred = current_cred(); if (flags & MS_REMOUNT) - return superblock_has_perm(current, path->mnt->mnt_sb, + return superblock_has_perm(cred, path->mnt->mnt_sb, FILESYSTEM__REMOUNT, NULL); else - return dentry_has_perm(current, path->mnt, path->dentry, + return dentry_has_perm(cred, path->mnt, path->dentry, FILE__MOUNTON); } static int selinux_umount(struct vfsmount *mnt, int flags) { - int rc; + const struct cred *cred = current_cred(); - rc = secondary_ops->sb_umount(mnt, flags); - if (rc) - return rc; - - return superblock_has_perm(current, mnt->mnt_sb, + return superblock_has_perm(cred, mnt->mnt_sb, FILESYSTEM__UNMOUNT, NULL); } @@ -2448,21 +2564,22 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, char **name, void **value, size_t *len) { - struct task_security_struct *tsec; + const struct cred *cred = current_cred(); + const struct task_security_struct *tsec = cred->security; struct inode_security_struct *dsec; struct superblock_security_struct *sbsec; - u32 newsid, clen; + u32 sid, newsid, clen; int rc; char *namep = NULL, *context; - tsec = current->security; dsec = dir->i_security; sbsec = dir->i_sb->s_security; - if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { - newsid = tsec->create_sid; - } else { - rc = security_transition_sid(tsec->sid, dsec->sid, + sid = tsec->sid; + newsid = tsec->create_sid; + + if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { + rc = security_transition_sid(sid, dsec->sid, inode_mode_to_security_class(inode->i_mode), &newsid); if (rc) { @@ -2476,14 +2593,14 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, } /* Possibly defer initialization to selinux_complete_init. */ - if (sbsec->initialized) { + if (sbsec->flags & SE_SBINITIALIZED) { struct inode_security_struct *isec = inode->i_security; isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; isec->initialized = 1; } - if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) + if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP)) return -EOPNOTSUPP; if (name) { @@ -2494,7 +2611,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, } if (value && len) { - rc = security_sid_to_context(newsid, &context, &clen); + rc = security_sid_to_context_force(newsid, &context, &clen); if (rc) { kfree(namep); return rc; @@ -2513,21 +2630,11 @@ static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int ma static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) { - int rc; - - rc = secondary_ops->inode_link(old_dentry, dir, new_dentry); - if (rc) - return rc; return may_link(dir, old_dentry, MAY_LINK); } static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) { - int rc; - - rc = secondary_ops->inode_unlink(dir, dentry); - if (rc) - return rc; return may_link(dir, dentry, MAY_UNLINK); } @@ -2548,12 +2655,6 @@ static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) { - int rc; - - rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); - if (rc) - return rc; - return may_create(dir, dentry, inode_mode_to_security_class(mode)); } @@ -2565,62 +2666,56 @@ static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dent static int selinux_inode_readlink(struct dentry *dentry) { - return dentry_has_perm(current, NULL, dentry, FILE__READ); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, NULL, dentry, FILE__READ); } static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) { - int rc; + const struct cred *cred = current_cred(); - rc = secondary_ops->inode_follow_link(dentry, nameidata); - if (rc) - return rc; - return dentry_has_perm(current, NULL, dentry, FILE__READ); + return dentry_has_perm(cred, NULL, dentry, FILE__READ); } -static int selinux_inode_permission(struct inode *inode, int mask, - struct nameidata *nd) +static int selinux_inode_permission(struct inode *inode, int mask) { - int rc; - - rc = secondary_ops->inode_permission(inode, mask, nd); - if (rc) - return rc; + const struct cred *cred = current_cred(); if (!mask) { /* No permission to check. Existence test. */ return 0; } - return inode_has_perm(current, inode, - open_file_mask_to_av(inode->i_mode, mask), NULL); + return inode_has_perm(cred, inode, + file_mask_to_av(inode->i_mode, mask), NULL); } static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) { - int rc; - - rc = secondary_ops->inode_setattr(dentry, iattr); - if (rc) - return rc; + const struct cred *cred = current_cred(); if (iattr->ia_valid & ATTR_FORCE) return 0; if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_ATIME_SET | ATTR_MTIME_SET)) - return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); + return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); - return dentry_has_perm(current, NULL, dentry, FILE__WRITE); + return dentry_has_perm(cred, NULL, dentry, FILE__WRITE); } static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) { - return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR); } -static int selinux_inode_setotherxattr(struct dentry *dentry, char *name) +static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) { + const struct cred *cred = current_cred(); + if (!strncmp(name, XATTR_SECURITY_PREFIX, sizeof XATTR_SECURITY_PREFIX - 1)) { if (!strcmp(name, XATTR_NAME_CAPS)) { @@ -2635,24 +2730,24 @@ static int selinux_inode_setotherxattr(struct dentry *dentry, char *name) /* Not an attribute we recognize, so just check the ordinary setattr permission. */ - return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); + return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); } -static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags) +static int selinux_inode_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) { - struct task_security_struct *tsec = current->security; struct inode *inode = dentry->d_inode; struct inode_security_struct *isec = inode->i_security; struct superblock_security_struct *sbsec; struct avc_audit_data ad; - u32 newsid; + u32 newsid, sid = current_sid(); int rc = 0; if (strcmp(name, XATTR_NAME_SELINUX)) return selinux_inode_setotherxattr(dentry, name); sbsec = inode->i_sb->s_security; - if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) + if (!(sbsec->flags & SE_SBLABELSUPP)) return -EOPNOTSUPP; if (!is_owner_or_cap(inode)) @@ -2661,21 +2756,26 @@ static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value AVC_AUDIT_DATA_INIT(&ad, FS); ad.u.fs.path.dentry = dentry; - rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, + rc = avc_has_perm(sid, isec->sid, isec->sclass, FILE__RELABELFROM, &ad); if (rc) return rc; rc = security_context_to_sid(value, size, &newsid); + if (rc == -EINVAL) { + if (!capable(CAP_MAC_ADMIN)) + return rc; + rc = security_context_to_sid_force(value, size, &newsid); + } if (rc) return rc; - rc = avc_has_perm(tsec->sid, newsid, isec->sclass, + rc = avc_has_perm(sid, newsid, isec->sclass, FILE__RELABELTO, &ad); if (rc) return rc; - rc = security_validate_transition(isec->sid, newsid, tsec->sid, + rc = security_validate_transition(isec->sid, newsid, sid, isec->sclass); if (rc) return rc; @@ -2687,8 +2787,9 @@ static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value &ad); } -static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, - void *value, size_t size, int flags) +static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, + int flags) { struct inode *inode = dentry->d_inode; struct inode_security_struct *isec = inode->i_security; @@ -2700,10 +2801,11 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, return; } - rc = security_context_to_sid(value, size, &newsid); + rc = security_context_to_sid_force(value, size, &newsid); if (rc) { - printk(KERN_WARNING "%s: unable to obtain SID for context " - "%s, rc=%d\n", __func__, (char *)value, -rc); + printk(KERN_ERR "SELinux: unable to map context to SID" + "for (%s, %lu), rc=%d\n", + inode->i_sb->s_id, inode->i_ino, -rc); return; } @@ -2711,17 +2813,21 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, return; } -static int selinux_inode_getxattr(struct dentry *dentry, char *name) +static int selinux_inode_getxattr(struct dentry *dentry, const char *name) { - return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); } static int selinux_inode_listxattr(struct dentry *dentry) { - return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); } -static int selinux_inode_removexattr(struct dentry *dentry, char *name) +static int selinux_inode_removexattr(struct dentry *dentry, const char *name) { if (strcmp(name, XATTR_NAME_SELINUX)) return selinux_inode_setotherxattr(dentry, name); @@ -2732,9 +2838,7 @@ static int selinux_inode_removexattr(struct dentry *dentry, char *name) } /* - * Copy the in-core inode security context value to the user. If the - * getxattr() prior to this succeeded, check to see if we need to - * canonicalize the value to be finally returned to the user. + * Copy the inode security context value to the user. * * Permission check is handled by selinux_inode_getxattr hook. */ @@ -2748,7 +2852,22 @@ static int selinux_inode_getsecurity(const struct inode *inode, const char *name if (strcmp(name, XATTR_SELINUX_SUFFIX)) return -EOPNOTSUPP; - error = security_sid_to_context(isec->sid, &context, &size); + /* + * If the caller has CAP_MAC_ADMIN, then get the raw context + * value even if it is not defined by current policy; otherwise, + * use the in-core value under current policy. + * Use the non-auditing forms of the permission checks since + * getxattr may be called by unprivileged processes commonly + * and lack of permission just means that we fall back to the + * in-core context value, not a denial. + */ + error = selinux_capable(current, current_cred(), CAP_MAC_ADMIN, + SECURITY_CAP_NOAUDIT); + if (!error) + error = security_sid_to_context_force(isec->sid, &context, + &size); + else + error = security_sid_to_context(isec->sid, &context, &size); if (error) return error; error = size; @@ -2810,6 +2929,7 @@ static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) static int selinux_revalidate_file_permission(struct file *file, int mask) { + const struct cred *cred = current_cred(); int rc; struct inode *inode = file->f_path.dentry->d_inode; @@ -2822,7 +2942,7 @@ static int selinux_revalidate_file_permission(struct file *file, int mask) if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) mask |= MAY_APPEND; - rc = file_has_perm(current, file, + rc = file_has_perm(cred, file, file_mask_to_av(inode->i_mode, mask)); if (rc) return rc; @@ -2833,16 +2953,16 @@ static int selinux_revalidate_file_permission(struct file *file, int mask) static int selinux_file_permission(struct file *file, int mask) { struct inode *inode = file->f_path.dentry->d_inode; - struct task_security_struct *tsec = current->security; struct file_security_struct *fsec = file->f_security; struct inode_security_struct *isec = inode->i_security; + u32 sid = current_sid(); if (!mask) { /* No permission to check. Existence test. */ return 0; } - if (tsec->sid == fsec->sid && fsec->isid == isec->sid + if (sid == fsec->sid && fsec->isid == isec->sid && fsec->pseqno == avc_policy_seqno()) return selinux_netlbl_inode_permission(inode, mask); @@ -2862,50 +2982,24 @@ static void selinux_file_free_security(struct file *file) static int selinux_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - int error = 0; - - switch (cmd) { - case FIONREAD: - /* fall through */ - case FIBMAP: - /* fall through */ - case FIGETBSZ: - /* fall through */ - case EXT2_IOC_GETFLAGS: - /* fall through */ - case EXT2_IOC_GETVERSION: - error = file_has_perm(current, file, FILE__GETATTR); - break; - - case EXT2_IOC_SETFLAGS: - /* fall through */ - case EXT2_IOC_SETVERSION: - error = file_has_perm(current, file, FILE__SETATTR); - break; - - /* sys_ioctl() checks */ - case FIONBIO: - /* fall through */ - case FIOASYNC: - error = file_has_perm(current, file, 0); - break; + const struct cred *cred = current_cred(); + u32 av = 0; - case KDSKBENT: - case KDSKBSENT: - error = task_has_capability(current, CAP_SYS_TTY_CONFIG); - break; + if (_IOC_DIR(cmd) & _IOC_WRITE) + av |= FILE__WRITE; + if (_IOC_DIR(cmd) & _IOC_READ) + av |= FILE__READ; + if (!av) + av = FILE__IOCTL; - /* default case assumes that the command will go - * to the file's ioctl() function. - */ - default: - error = file_has_perm(current, file, FILE__IOCTL); - } - return error; + return file_has_perm(cred, file, av); } static int file_map_prot_check(struct file *file, unsigned long prot, int shared) { + const struct cred *cred = current_cred(); + int rc = 0; + #ifndef CONFIG_PPC32 if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { /* @@ -2913,9 +3007,9 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared * private file mapping that will also be writable. * This has an additional check. */ - int rc = task_has_perm(current, current, PROCESS__EXECMEM); + rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); if (rc) - return rc; + goto error; } #endif @@ -2930,9 +3024,11 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared if (prot & PROT_EXEC) av |= FILE__EXECUTE; - return file_has_perm(current, file, av); + return file_has_perm(cred, file, av); } - return 0; + +error: + return rc; } static int selinux_file_mmap(struct file *file, unsigned long reqprot, @@ -2940,7 +3036,7 @@ static int selinux_file_mmap(struct file *file, unsigned long reqprot, unsigned long addr, unsigned long addr_only) { int rc = 0; - u32 sid = ((struct task_security_struct *)(current->security))->sid; + u32 sid = current_sid(); if (addr < mmap_min_addr) rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, @@ -2959,26 +3055,21 @@ static int selinux_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, unsigned long prot) { - int rc; - - rc = secondary_ops->file_mprotect(vma, reqprot, prot); - if (rc) - return rc; + const struct cred *cred = current_cred(); if (selinux_checkreqprot) prot = reqprot; #ifndef CONFIG_PPC32 if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { - rc = 0; + int rc = 0; if (vma->vm_start >= vma->vm_mm->start_brk && vma->vm_end <= vma->vm_mm->brk) { - rc = task_has_perm(current, current, - PROCESS__EXECHEAP); + rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); } else if (!vma->vm_file && vma->vm_start <= vma->vm_mm->start_stack && vma->vm_end >= vma->vm_mm->start_stack) { - rc = task_has_perm(current, current, PROCESS__EXECSTACK); + rc = current_has_perm(current, PROCESS__EXECSTACK); } else if (vma->vm_file && vma->anon_vma) { /* * We are making executable a file mapping that has @@ -2987,8 +3078,7 @@ static int selinux_file_mprotect(struct vm_area_struct *vma, * modified content. This typically should only * occur for text relocations. */ - rc = file_has_perm(current, vma->vm_file, - FILE__EXECMOD); + rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); } if (rc) return rc; @@ -3000,12 +3090,15 @@ static int selinux_file_mprotect(struct vm_area_struct *vma, static int selinux_file_lock(struct file *file, unsigned int cmd) { - return file_has_perm(current, file, FILE__LOCK); + const struct cred *cred = current_cred(); + + return file_has_perm(cred, file, FILE__LOCK); } static int selinux_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) { + const struct cred *cred = current_cred(); int err = 0; switch (cmd) { @@ -3016,7 +3109,7 @@ static int selinux_file_fcntl(struct file *file, unsigned int cmd, } if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { - err = file_has_perm(current, file, FILE__WRITE); + err = file_has_perm(cred, file, FILE__WRITE); break; } /* fall through */ @@ -3026,7 +3119,7 @@ static int selinux_file_fcntl(struct file *file, unsigned int cmd, case F_GETOWN: case F_GETSIG: /* Just check FD__USE permission */ - err = file_has_perm(current, file, 0); + err = file_has_perm(cred, file, 0); break; case F_GETLK: case F_SETLK: @@ -3040,7 +3133,7 @@ static int selinux_file_fcntl(struct file *file, unsigned int cmd, err = -EINVAL; break; } - err = file_has_perm(current, file, FILE__LOCK); + err = file_has_perm(cred, file, FILE__LOCK); break; } @@ -3049,12 +3142,10 @@ static int selinux_file_fcntl(struct file *file, unsigned int cmd, static int selinux_file_set_fowner(struct file *file) { - struct task_security_struct *tsec; struct file_security_struct *fsec; - tsec = current->security; fsec = file->f_security; - fsec->fown_sid = tsec->sid; + fsec->fown_sid = current_sid(); return 0; } @@ -3063,14 +3154,13 @@ static int selinux_file_send_sigiotask(struct task_struct *tsk, struct fown_struct *fown, int signum) { struct file *file; + u32 sid = current_sid(); u32 perm; - struct task_security_struct *tsec; struct file_security_struct *fsec; /* struct fown_struct is never outside the context of a struct file */ file = container_of(fown, struct file, f_owner); - tsec = tsk->security; fsec = file->f_security; if (!signum) @@ -3078,20 +3168,23 @@ static int selinux_file_send_sigiotask(struct task_struct *tsk, else perm = signal_to_av(signum); - return avc_has_perm(fsec->fown_sid, tsec->sid, + return avc_has_perm(fsec->fown_sid, sid, SECCLASS_PROCESS, perm, NULL); } static int selinux_file_receive(struct file *file) { - return file_has_perm(current, file, file_to_av(file)); + const struct cred *cred = current_cred(); + + return file_has_perm(cred, file, file_to_av(file)); } -static int selinux_dentry_open(struct file *file) +static int selinux_dentry_open(struct file *file, const struct cred *cred) { struct file_security_struct *fsec; struct inode *inode; struct inode_security_struct *isec; + inode = file->f_path.dentry->d_inode; fsec = file->f_security; isec = inode->i_security; @@ -3112,49 +3205,87 @@ static int selinux_dentry_open(struct file *file) * new inode label or new policy. * This check is not redundant - do not remove. */ - return inode_has_perm(current, inode, file_to_av(file), NULL); + return inode_has_perm(cred, inode, open_file_to_av(file), NULL); } /* task security operations */ static int selinux_task_create(unsigned long clone_flags) { - int rc; - - rc = secondary_ops->task_create(clone_flags); - if (rc) - return rc; - - return task_has_perm(current, current, PROCESS__FORK); + return current_has_perm(current, PROCESS__FORK); } -static int selinux_task_alloc_security(struct task_struct *tsk) +/* + * detach and free the LSM part of a set of credentials + */ +static void selinux_cred_free(struct cred *cred) { - struct task_security_struct *tsec1, *tsec2; - int rc; - - tsec1 = current->security; + struct task_security_struct *tsec = cred->security; + cred->security = NULL; + kfree(tsec); +} - rc = task_alloc_security(tsk); - if (rc) - return rc; - tsec2 = tsk->security; +/* + * prepare a new set of credentials for modification + */ +static int selinux_cred_prepare(struct cred *new, const struct cred *old, + gfp_t gfp) +{ + const struct task_security_struct *old_tsec; + struct task_security_struct *tsec; - tsec2->osid = tsec1->osid; - tsec2->sid = tsec1->sid; + old_tsec = old->security; - /* Retain the exec, fs, key, and sock SIDs across fork */ - tsec2->exec_sid = tsec1->exec_sid; - tsec2->create_sid = tsec1->create_sid; - tsec2->keycreate_sid = tsec1->keycreate_sid; - tsec2->sockcreate_sid = tsec1->sockcreate_sid; + tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); + if (!tsec) + return -ENOMEM; + new->security = tsec; return 0; } -static void selinux_task_free_security(struct task_struct *tsk) +/* + * set the security data for a kernel service + * - all the creation contexts are set to unlabelled + */ +static int selinux_kernel_act_as(struct cred *new, u32 secid) +{ + struct task_security_struct *tsec = new->security; + u32 sid = current_sid(); + int ret; + + ret = avc_has_perm(sid, secid, + SECCLASS_KERNEL_SERVICE, + KERNEL_SERVICE__USE_AS_OVERRIDE, + NULL); + if (ret == 0) { + tsec->sid = secid; + tsec->create_sid = 0; + tsec->keycreate_sid = 0; + tsec->sockcreate_sid = 0; + } + return ret; +} + +/* + * set the file creation context in a security record to the same as the + * objective context of the specified inode + */ +static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) { - task_free_security(tsk); + struct inode_security_struct *isec = inode->i_security; + struct task_security_struct *tsec = new->security; + u32 sid = current_sid(); + int ret; + + ret = avc_has_perm(sid, isec->sid, + SECCLASS_KERNEL_SERVICE, + KERNEL_SERVICE__CREATE_FILES_AS, + NULL); + + if (ret == 0) + tsec->create_sid = isec->sid; + return 0; } static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) @@ -3168,9 +3299,10 @@ static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) return 0; } -static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) +static int selinux_task_fix_setuid(struct cred *new, const struct cred *old, + int flags) { - return secondary_ops->task_post_setuid(id0, id1, id2, flags); + return secondary_ops->task_fix_setuid(new, old, flags); } static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) @@ -3181,23 +3313,22 @@ static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) { - return task_has_perm(current, p, PROCESS__SETPGID); + return current_has_perm(p, PROCESS__SETPGID); } static int selinux_task_getpgid(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETPGID); + return current_has_perm(p, PROCESS__GETPGID); } static int selinux_task_getsid(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETSESSION); + return current_has_perm(p, PROCESS__GETSESSION); } static void selinux_task_getsecid(struct task_struct *p, u32 *secid) { - struct task_security_struct *tsec = p->security; - *secid = tsec->sid; + *secid = task_sid(p); } static int selinux_task_setgroups(struct group_info *group_info) @@ -3214,7 +3345,7 @@ static int selinux_task_setnice(struct task_struct *p, int nice) if (rc) return rc; - return task_has_perm(current, p, PROCESS__SETSCHED); + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_setioprio(struct task_struct *p, int ioprio) @@ -3225,29 +3356,24 @@ static int selinux_task_setioprio(struct task_struct *p, int ioprio) if (rc) return rc; - return task_has_perm(current, p, PROCESS__SETSCHED); + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_getioprio(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETSCHED); + return current_has_perm(p, PROCESS__GETSCHED); } -static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) -{ - struct rlimit *old_rlim = current->signal->rlim + resource; - int rc; - - rc = secondary_ops->task_setrlimit(resource, new_rlim); - if (rc) - return rc; +static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) +{ + struct rlimit *old_rlim = current->signal->rlim + resource; /* Control the ability to change the hard limit (whether lowering or raising it), so that the hard limit can later be used as a safe reset point for the soft limit - upon context transitions. See selinux_bprm_apply_creds. */ + upon context transitions. See selinux_bprm_committing_creds. */ if (old_rlim->rlim_max != new_rlim->rlim_max) - return task_has_perm(current, current, PROCESS__SETRLIMIT); + return current_has_perm(current, PROCESS__SETRLIMIT); return 0; } @@ -3260,17 +3386,17 @@ static int selinux_task_setscheduler(struct task_struct *p, int policy, struct s if (rc) return rc; - return task_has_perm(current, p, PROCESS__SETSCHED); + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_getscheduler(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETSCHED); + return current_has_perm(p, PROCESS__GETSCHED); } static int selinux_task_movememory(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__SETSCHED); + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_kill(struct task_struct *p, struct siginfo *info, @@ -3278,24 +3404,16 @@ static int selinux_task_kill(struct task_struct *p, struct siginfo *info, { u32 perm; int rc; - struct task_security_struct *tsec; - - rc = secondary_ops->task_kill(p, info, sig, secid); - if (rc) - return rc; - - if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info))) - return 0; if (!sig) perm = PROCESS__SIGNULL; /* null signal; existence test */ else perm = signal_to_av(sig); - tsec = p->security; if (secid) - rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL); + rc = avc_has_perm(secid, task_sid(p), + SECCLASS_PROCESS, perm, NULL); else - rc = task_has_perm(current, p, perm); + rc = current_has_perm(p, perm); return rc; } @@ -3303,13 +3421,12 @@ static int selinux_task_prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, - unsigned long arg5, - long *rc_p) + unsigned long arg5) { /* The current prctl operations do not appear to require any SELinux controls since they merely observe or modify the state of the current process. */ - return secondary_ops->task_prctl(option, arg2, arg3, arg4, arg5, rc_p); + return secondary_ops->task_prctl(option, arg2, arg3, arg4, arg5); } static int selinux_task_wait(struct task_struct *p) @@ -3317,27 +3434,14 @@ static int selinux_task_wait(struct task_struct *p) return task_has_perm(p, current, PROCESS__SIGCHLD); } -static void selinux_task_reparent_to_init(struct task_struct *p) -{ - struct task_security_struct *tsec; - - secondary_ops->task_reparent_to_init(p); - - tsec = p->security; - tsec->osid = tsec->sid; - tsec->sid = SECINITSID_KERNEL; - return; -} - static void selinux_task_to_inode(struct task_struct *p, struct inode *inode) { - struct task_security_struct *tsec = p->security; struct inode_security_struct *isec = inode->i_security; + u32 sid = task_sid(p); - isec->sid = tsec->sid; + isec->sid = sid; isec->initialized = 1; - return; } /* Returns error only if unable to parse addresses */ @@ -3495,38 +3599,44 @@ out: #endif /* IPV6 */ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, - char **addrp, int src, u8 *proto) + char **_addrp, int src, u8 *proto) { - int ret = 0; + char *addrp; + int ret; switch (ad->u.net.family) { case PF_INET: ret = selinux_parse_skb_ipv4(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v4info.saddr : - &ad->u.net.v4info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v4info.saddr : + &ad->u.net.v4info.daddr); + goto okay; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) case PF_INET6: ret = selinux_parse_skb_ipv6(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v6info.saddr : - &ad->u.net.v6info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v6info.saddr : + &ad->u.net.v6info.daddr); + goto okay; #endif /* IPV6 */ default: - break; + addrp = NULL; + goto okay; } - if (unlikely(ret)) - printk(KERN_WARNING - "SELinux: failure in selinux_parse_skb()," - " unable to parse packet\n"); - +parse_error: + printk(KERN_WARNING + "SELinux: failure in selinux_parse_skb()," + " unable to parse packet\n"); return ret; + +okay: + if (_addrp) + *_addrp = addrp; + return 0; } /** @@ -3570,19 +3680,19 @@ static int socket_has_perm(struct task_struct *task, struct socket *sock, u32 perms) { struct inode_security_struct *isec; - struct task_security_struct *tsec; struct avc_audit_data ad; + u32 sid; int err = 0; - tsec = task->security; isec = SOCK_INODE(sock)->i_security; if (isec->sid == SECINITSID_KERNEL) goto out; + sid = task_sid(task); AVC_AUDIT_DATA_INIT(&ad, NET); ad.u.net.sk = sock->sk; - err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); + err = avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); out: return err; @@ -3591,18 +3701,20 @@ out: static int selinux_socket_create(int family, int type, int protocol, int kern) { + const struct cred *cred = current_cred(); + const struct task_security_struct *tsec = cred->security; + u32 sid, newsid; + u16 secclass; int err = 0; - struct task_security_struct *tsec; - u32 newsid; if (kern) goto out; - tsec = current->security; - newsid = tsec->sockcreate_sid ? : tsec->sid; - err = avc_has_perm(tsec->sid, newsid, - socket_type_to_security_class(family, type, - protocol), SOCKET__CREATE, NULL); + sid = tsec->sid; + newsid = tsec->sockcreate_sid ?: sid; + + secclass = socket_type_to_security_class(family, type, protocol); + err = avc_has_perm(sid, newsid, secclass, SOCKET__CREATE, NULL); out: return err; @@ -3611,18 +3723,26 @@ out: static int selinux_socket_post_create(struct socket *sock, int family, int type, int protocol, int kern) { - int err = 0; + const struct cred *cred = current_cred(); + const struct task_security_struct *tsec = cred->security; struct inode_security_struct *isec; - struct task_security_struct *tsec; struct sk_security_struct *sksec; - u32 newsid; + u32 sid, newsid; + int err = 0; + + sid = tsec->sid; + newsid = tsec->sockcreate_sid; isec = SOCK_INODE(sock)->i_security; - tsec = current->security; - newsid = tsec->sockcreate_sid ? : tsec->sid; + if (kern) + isec->sid = SECINITSID_KERNEL; + else if (newsid) + isec->sid = newsid; + else + isec->sid = sid; + isec->sclass = socket_type_to_security_class(family, type, protocol); - isec->sid = kern ? SECINITSID_KERNEL : newsid; isec->initialized = 1; if (sock->sk) { @@ -3657,26 +3777,22 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in if (family == PF_INET || family == PF_INET6) { char *addrp; struct inode_security_struct *isec; - struct task_security_struct *tsec; struct avc_audit_data ad; struct sockaddr_in *addr4 = NULL; struct sockaddr_in6 *addr6 = NULL; unsigned short snum; struct sock *sk = sock->sk; - u32 sid, node_perm, addrlen; + u32 sid, node_perm; - tsec = current->security; isec = SOCK_INODE(sock)->i_security; if (family == PF_INET) { addr4 = (struct sockaddr_in *)address; snum = ntohs(addr4->sin_port); - addrlen = sizeof(addr4->sin_addr.s_addr); addrp = (char *)&addr4->sin_addr.s_addr; } else { addr6 = (struct sockaddr_in6 *)address; snum = ntohs(addr6->sin6_port); - addrlen = sizeof(addr6->sin6_addr.s6_addr); addrp = (char *)&addr6->sin6_addr.s6_addr; } @@ -3743,6 +3859,7 @@ out: static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) { + struct sock *sk = sock->sk; struct inode_security_struct *isec; int err; @@ -3756,7 +3873,6 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, isec = SOCK_INODE(sock)->i_security; if (isec->sclass == SECCLASS_TCP_SOCKET || isec->sclass == SECCLASS_DCCP_SOCKET) { - struct sock *sk = sock->sk; struct avc_audit_data ad; struct sockaddr_in *addr4 = NULL; struct sockaddr_in6 *addr6 = NULL; @@ -3790,6 +3906,8 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, goto out; } + err = selinux_netlbl_socket_connect(sk, address); + out: return err; } @@ -3879,10 +3997,6 @@ static int selinux_socket_unix_stream_connect(struct socket *sock, struct avc_audit_data ad; int err; - err = secondary_ops->unix_stream_connect(sock, other, newsk); - if (err) - return err; - isec = SOCK_INODE(sock)->i_security; other_isec = SOCK_INODE(other)->i_security; @@ -4019,20 +4133,28 @@ static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk, } static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, - struct avc_audit_data *ad, - u16 family, char *addrp) + u16 family) { - int err; + int err = 0; struct sk_security_struct *sksec = sk->sk_security; u32 peer_sid; u32 sk_sid = sksec->sid; + struct avc_audit_data ad; + char *addrp; + + AVC_AUDIT_DATA_INIT(&ad, NET); + ad.u.net.netif = skb->iif; + ad.u.net.family = family; + err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); + if (err) + return err; if (selinux_compat_net) - err = selinux_sock_rcv_skb_iptables_compat(sk, skb, ad, + err = selinux_sock_rcv_skb_iptables_compat(sk, skb, &ad, family, addrp); - else + else if (selinux_secmark_enabled()) err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, - PACKET__RECV, ad); + PACKET__RECV, &ad); if (err) return err; @@ -4041,12 +4163,14 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, if (err) return err; err = avc_has_perm(sk_sid, peer_sid, - SECCLASS_PEER, PEER__RECV, ad); + SECCLASS_PEER, PEER__RECV, &ad); + if (err) + selinux_netlbl_err(skb, err, 0); } else { - err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, ad); + err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad); if (err) return err; - err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, ad); + err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); } return err; @@ -4060,6 +4184,8 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) u32 sk_sid = sksec->sid; struct avc_audit_data ad; char *addrp; + u8 secmark_active; + u8 peerlbl_active; if (family != PF_INET && family != PF_INET6) return 0; @@ -4068,6 +4194,18 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) family = PF_INET; + /* If any sort of compatibility mode is enabled then handoff processing + * to the selinux_sock_rcv_skb_compat() function to deal with the + * special handling. We do this in an attempt to keep this function + * as fast and as clean as possible. */ + if (selinux_compat_net || !selinux_policycap_netpeer) + return selinux_sock_rcv_skb_compat(sk, skb, family); + + secmark_active = selinux_secmark_enabled(); + peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); + if (!secmark_active && !peerlbl_active) + return 0; + AVC_AUDIT_DATA_INIT(&ad, NET); ad.u.net.netif = skb->iif; ad.u.net.family = family; @@ -4075,15 +4213,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) if (err) return err; - /* If any sort of compatibility mode is enabled then handoff processing - * to the selinux_sock_rcv_skb_compat() function to deal with the - * special handling. We do this in an attempt to keep this function - * as fast and as clean as possible. */ - if (selinux_compat_net || !selinux_policycap_netpeer) - return selinux_sock_rcv_skb_compat(sk, skb, &ad, - family, addrp); - - if (netlbl_enabled() || selinux_xfrm_enabled()) { + if (peerlbl_active) { u32 peer_sid; err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); @@ -4091,13 +4221,17 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) return err; err = selinux_inet_sys_rcv_skb(skb->iif, addrp, family, peer_sid, &ad); - if (err) + if (err) { + selinux_netlbl_err(skb, err, 0); return err; + } err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, PEER__RECV, &ad); + if (err) + selinux_netlbl_err(skb, err, 0); } - if (selinux_secmark_enabled()) { + if (secmark_active) { err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, PACKET__RECV, &ad); if (err) @@ -4156,10 +4290,12 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff * u32 peer_secid = SECSID_NULL; u16 family; - if (sock) + if (skb && skb->protocol == htons(ETH_P_IP)) + family = PF_INET; + else if (skb && skb->protocol == htons(ETH_P_IPV6)) + family = PF_INET6; + else if (sock) family = sock->sk->sk_family; - else if (skb && skb->sk) - family = skb->sk->sk_family; else goto out; @@ -4217,8 +4353,6 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent) sk->sk_family == PF_UNIX) isec->sid = sksec->sid; sksec->sclass = isec->sclass; - - selinux_netlbl_sock_graft(sk, parent); } static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, @@ -4226,10 +4360,15 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, { struct sk_security_struct *sksec = sk->sk_security; int err; + u16 family = sk->sk_family; u32 newsid; u32 peersid; - err = selinux_skb_peerlbl_sid(skb, sk->sk_family, &peersid); + /* handle mapped IPv4 packets arriving via IPv6 sockets */ + if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) + family = PF_INET; + + err = selinux_skb_peerlbl_sid(skb, family, &peersid); if (err) return err; if (peersid == SECSID_NULL) { @@ -4264,12 +4403,18 @@ static void selinux_inet_csk_clone(struct sock *newsk, selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family); } -static void selinux_inet_conn_established(struct sock *sk, - struct sk_buff *skb) +static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb) { + u16 family = sk->sk_family; struct sk_security_struct *sksec = sk->sk_security; - selinux_skb_peerlbl_sid(skb, sk->sk_family, &sksec->peer_sid); + /* handle mapped IPv4 packets arriving via IPv6 sockets */ + if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) + family = PF_INET; + + selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid); + + selinux_netlbl_inet_conn_established(sk, family); } static void selinux_req_classify_flow(const struct request_sock *req, @@ -4299,7 +4444,7 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) "SELinux: unrecognized netlink message" " type=%hu for sclass=%hu\n", nlh->nlmsg_type, isec->sclass); - if (!selinux_enforcing) + if (!selinux_enforcing || security_get_allow_unknown()) err = 0; } @@ -4319,39 +4464,54 @@ out: static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, u16 family) { + int err; char *addrp; u32 peer_sid; struct avc_audit_data ad; u8 secmark_active; + u8 netlbl_active; u8 peerlbl_active; if (!selinux_policycap_netpeer) return NF_ACCEPT; secmark_active = selinux_secmark_enabled(); - peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); + netlbl_active = netlbl_enabled(); + peerlbl_active = netlbl_active || selinux_xfrm_enabled(); if (!secmark_active && !peerlbl_active) return NF_ACCEPT; + if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) + return NF_DROP; + AVC_AUDIT_DATA_INIT(&ad, NET); ad.u.net.netif = ifindex; ad.u.net.family = family; if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) return NF_DROP; - if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) - return NF_DROP; - - if (peerlbl_active) - if (selinux_inet_sys_rcv_skb(ifindex, addrp, family, - peer_sid, &ad) != 0) + if (peerlbl_active) { + err = selinux_inet_sys_rcv_skb(ifindex, addrp, family, + peer_sid, &ad); + if (err) { + selinux_netlbl_err(skb, err, 1); return NF_DROP; + } + } if (secmark_active) if (avc_has_perm(peer_sid, skb->secmark, SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) return NF_DROP; + if (netlbl_active) + /* we do this in the FORWARD path and not the POST_ROUTING + * path because we want to make sure we apply the necessary + * labeling before IPsec is applied so we can leverage AH + * protection */ + if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0) + return NF_DROP; + return NF_ACCEPT; } @@ -4375,6 +4535,37 @@ static unsigned int selinux_ipv6_forward(unsigned int hooknum, } #endif /* IPV6 */ +static unsigned int selinux_ip_output(struct sk_buff *skb, + u16 family) +{ + u32 sid; + + if (!netlbl_enabled()) + return NF_ACCEPT; + + /* we do this in the LOCAL_OUT path and not the POST_ROUTING path + * because we want to make sure we apply the necessary labeling + * before IPsec is applied so we can leverage AH protection */ + if (skb->sk) { + struct sk_security_struct *sksec = skb->sk->sk_security; + sid = sksec->sid; + } else + sid = SECINITSID_KERNEL; + if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0) + return NF_DROP; + + return NF_ACCEPT; +} + +static unsigned int selinux_ipv4_output(unsigned int hooknum, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + return selinux_ip_output(skb, PF_INET); +} + static int selinux_ip_postroute_iptables_compat(struct sock *sk, int ifindex, struct avc_audit_data *ad, @@ -4442,30 +4633,36 @@ static int selinux_ip_postroute_iptables_compat(struct sock *sk, static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, int ifindex, - struct avc_audit_data *ad, - u16 family, - char *addrp, - u8 proto) + u16 family) { struct sock *sk = skb->sk; struct sk_security_struct *sksec; + struct avc_audit_data ad; + char *addrp; + u8 proto; if (sk == NULL) return NF_ACCEPT; sksec = sk->sk_security; + AVC_AUDIT_DATA_INIT(&ad, NET); + ad.u.net.netif = ifindex; + ad.u.net.family = family; + if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) + return NF_DROP; + if (selinux_compat_net) { if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex, - ad, family, addrp)) + &ad, family, addrp)) return NF_DROP; - } else { + } else if (selinux_secmark_enabled()) { if (avc_has_perm(sksec->sid, skb->secmark, - SECCLASS_PACKET, PACKET__SEND, ad)) + SECCLASS_PACKET, PACKET__SEND, &ad)) return NF_DROP; } if (selinux_policycap_netpeer) - if (selinux_xfrm_postroute_last(sksec->sid, skb, ad, proto)) + if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) return NF_DROP; return NF_ACCEPT; @@ -4479,24 +4676,16 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, struct sock *sk; struct avc_audit_data ad; char *addrp; - u8 proto; u8 secmark_active; u8 peerlbl_active; - AVC_AUDIT_DATA_INIT(&ad, NET); - ad.u.net.netif = ifindex; - ad.u.net.family = family; - if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) - return NF_DROP; - /* If any sort of compatibility mode is enabled then handoff processing * to the selinux_ip_postroute_compat() function to deal with the * special handling. We do this in an attempt to keep this function * as fast and as clean as possible. */ if (selinux_compat_net || !selinux_policycap_netpeer) - return selinux_ip_postroute_compat(skb, ifindex, &ad, - family, addrp, proto); - + return selinux_ip_postroute_compat(skb, ifindex, family); +#ifdef CONFIG_XFRM /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec * packet transformation so allow the packet to pass without any checks * since we'll have another chance to perform access control checks @@ -4505,27 +4694,51 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, * is NULL, in this case go ahead and apply access control. */ if (skb->dst != NULL && skb->dst->xfrm != NULL) return NF_ACCEPT; - +#endif secmark_active = selinux_secmark_enabled(); peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); if (!secmark_active && !peerlbl_active) return NF_ACCEPT; - /* if the packet is locally generated (skb->sk != NULL) then use the - * socket's label as the peer label, otherwise the packet is being - * forwarded through this system and we need to fetch the peer label - * directly from the packet */ + /* if the packet is being forwarded then get the peer label from the + * packet itself; otherwise check to see if it is from a local + * application or the kernel, if from an application get the peer label + * from the sending socket, otherwise use the kernel's sid */ sk = skb->sk; - if (sk) { + if (sk == NULL) { + switch (family) { + case PF_INET: + if (IPCB(skb)->flags & IPSKB_FORWARDED) + secmark_perm = PACKET__FORWARD_OUT; + else + secmark_perm = PACKET__SEND; + break; + case PF_INET6: + if (IP6CB(skb)->flags & IP6SKB_FORWARDED) + secmark_perm = PACKET__FORWARD_OUT; + else + secmark_perm = PACKET__SEND; + break; + default: + return NF_DROP; + } + if (secmark_perm == PACKET__FORWARD_OUT) { + if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) + return NF_DROP; + } else + peer_sid = SECINITSID_KERNEL; + } else { struct sk_security_struct *sksec = sk->sk_security; peer_sid = sksec->sid; secmark_perm = PACKET__SEND; - } else { - if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) - return NF_DROP; - secmark_perm = PACKET__FORWARD_OUT; } + AVC_AUDIT_DATA_INIT(&ad, NET); + ad.u.net.netif = ifindex; + ad.u.net.family = family; + if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL)) + return NF_DROP; + if (secmark_active) if (avc_has_perm(peer_sid, skb->secmark, SECCLASS_PACKET, secmark_perm, &ad)) @@ -4607,15 +4820,16 @@ static int ipc_alloc_security(struct task_struct *task, struct kern_ipc_perm *perm, u16 sclass) { - struct task_security_struct *tsec = task->security; struct ipc_security_struct *isec; + u32 sid; isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); if (!isec) return -ENOMEM; + sid = task_sid(task); isec->sclass = sclass; - isec->sid = tsec->sid; + isec->sid = sid; perm->security = isec; return 0; @@ -4653,17 +4867,16 @@ static void msg_msg_free_security(struct msg_msg *msg) static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, u32 perms) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct avc_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = ipc_perms->security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = ipc_perms->key; - return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); + return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); } static int selinux_msg_msg_alloc_security(struct msg_msg *msg) @@ -4679,22 +4892,21 @@ static void selinux_msg_msg_free_security(struct msg_msg *msg) /* message queue security operations */ static int selinux_msg_queue_alloc_security(struct msg_queue *msq) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct avc_audit_data ad; + u32 sid = current_sid(); int rc; rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); if (rc) return rc; - tsec = current->security; isec = msq->q_perm.security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = msq->q_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, + rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__CREATE, &ad); if (rc) { ipc_free_security(&msq->q_perm); @@ -4710,17 +4922,16 @@ static void selinux_msg_queue_free_security(struct msg_queue *msq) static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct avc_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = msq->q_perm.security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = msq->q_perm.key; - return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, + return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__ASSOCIATE, &ad); } @@ -4754,13 +4965,12 @@ static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct msg_security_struct *msec; struct avc_audit_data ad; + u32 sid = current_sid(); int rc; - tsec = current->security; isec = msq->q_perm.security; msec = msg->security; @@ -4772,9 +4982,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, * Compute new sid based on current process and * message queue this message will be stored in */ - rc = security_transition_sid(tsec->sid, - isec->sid, - SECCLASS_MSG, + rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, &msec->sid); if (rc) return rc; @@ -4784,16 +4992,16 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, ad.u.ipc_id = msq->q_perm.key; /* Can this process write to the queue? */ - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, + rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__WRITE, &ad); if (!rc) /* Can this process send the message */ - rc = avc_has_perm(tsec->sid, msec->sid, - SECCLASS_MSG, MSG__SEND, &ad); + rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, + MSG__SEND, &ad); if (!rc) /* Can the message be put in the queue? */ - rc = avc_has_perm(msec->sid, isec->sid, - SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad); + rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ, + MSGQ__ENQUEUE, &ad); return rc; } @@ -4802,23 +5010,22 @@ static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct msg_security_struct *msec; struct avc_audit_data ad; + u32 sid = task_sid(target); int rc; - tsec = target->security; isec = msq->q_perm.security; msec = msg->security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = msq->q_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, + rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__READ, &ad); if (!rc) - rc = avc_has_perm(tsec->sid, msec->sid, + rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, MSG__RECEIVE, &ad); return rc; } @@ -4826,22 +5033,21 @@ static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, /* Shared Memory security operations */ static int selinux_shm_alloc_security(struct shmid_kernel *shp) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct avc_audit_data ad; + u32 sid = current_sid(); int rc; rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); if (rc) return rc; - tsec = current->security; isec = shp->shm_perm.security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = shp->shm_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, + rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM, SHM__CREATE, &ad); if (rc) { ipc_free_security(&shp->shm_perm); @@ -4857,17 +5063,16 @@ static void selinux_shm_free_security(struct shmid_kernel *shp) static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct avc_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = shp->shm_perm.security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = shp->shm_perm.key; - return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, + return avc_has_perm(sid, isec->sid, SECCLASS_SHM, SHM__ASSOCIATE, &ad); } @@ -4908,11 +5113,6 @@ static int selinux_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmflg) { u32 perms; - int rc; - - rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg); - if (rc) - return rc; if (shmflg & SHM_RDONLY) perms = SHM__READ; @@ -4925,22 +5125,21 @@ static int selinux_shm_shmat(struct shmid_kernel *shp, /* Semaphore security operations */ static int selinux_sem_alloc_security(struct sem_array *sma) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct avc_audit_data ad; + u32 sid = current_sid(); int rc; rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); if (rc) return rc; - tsec = current->security; isec = sma->sem_perm.security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = sma->sem_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, + rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM, SEM__CREATE, &ad); if (rc) { ipc_free_security(&sma->sem_perm); @@ -4956,17 +5155,16 @@ static void selinux_sem_free_security(struct sem_array *sma) static int selinux_sem_associate(struct sem_array *sma, int semflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct avc_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = sma->sem_perm.security; AVC_AUDIT_DATA_INIT(&ad, IPC); ad.u.ipc_id = sma->sem_perm.key; - return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, + return avc_has_perm(sid, isec->sid, SECCLASS_SEM, SEM__ASSOCIATE, &ad); } @@ -5047,24 +5245,6 @@ static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) *secid = isec->sid; } -/* module stacking operations */ -static int selinux_register_security(const char *name, struct security_operations *ops) -{ - if (secondary_ops != original_ops) { - printk(KERN_ERR "%s: There is already a secondary security " - "module registered.\n", __func__); - return -EINVAL; - } - - secondary_ops = ops; - - printk(KERN_INFO "%s: Registering secondary module %s\n", - __func__, - name); - - return 0; -} - static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) { if (inode) @@ -5074,33 +5254,35 @@ static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) static int selinux_getprocattr(struct task_struct *p, char *name, char **value) { - struct task_security_struct *tsec; + const struct task_security_struct *__tsec; u32 sid; int error; unsigned len; if (current != p) { - error = task_has_perm(current, p, PROCESS__GETATTR); + error = current_has_perm(p, PROCESS__GETATTR); if (error) return error; } - tsec = p->security; + rcu_read_lock(); + __tsec = __task_cred(p)->security; if (!strcmp(name, "current")) - sid = tsec->sid; + sid = __tsec->sid; else if (!strcmp(name, "prev")) - sid = tsec->osid; + sid = __tsec->osid; else if (!strcmp(name, "exec")) - sid = tsec->exec_sid; + sid = __tsec->exec_sid; else if (!strcmp(name, "fscreate")) - sid = tsec->create_sid; + sid = __tsec->create_sid; else if (!strcmp(name, "keycreate")) - sid = tsec->keycreate_sid; + sid = __tsec->keycreate_sid; else if (!strcmp(name, "sockcreate")) - sid = tsec->sockcreate_sid; + sid = __tsec->sockcreate_sid; else - return -EINVAL; + goto invalid; + rcu_read_unlock(); if (!sid) return 0; @@ -5109,6 +5291,10 @@ static int selinux_getprocattr(struct task_struct *p, if (error) return error; return len; + +invalid: + rcu_read_unlock(); + return -EINVAL; } static int selinux_setprocattr(struct task_struct *p, @@ -5116,7 +5302,8 @@ static int selinux_setprocattr(struct task_struct *p, { struct task_security_struct *tsec; struct task_struct *tracer; - u32 sid = 0; + struct cred *new; + u32 sid = 0, ptsid; int error; char *str = value; @@ -5132,15 +5319,15 @@ static int selinux_setprocattr(struct task_struct *p, * above restriction is ever removed. */ if (!strcmp(name, "exec")) - error = task_has_perm(current, p, PROCESS__SETEXEC); + error = current_has_perm(p, PROCESS__SETEXEC); else if (!strcmp(name, "fscreate")) - error = task_has_perm(current, p, PROCESS__SETFSCREATE); + error = current_has_perm(p, PROCESS__SETFSCREATE); else if (!strcmp(name, "keycreate")) - error = task_has_perm(current, p, PROCESS__SETKEYCREATE); + error = current_has_perm(p, PROCESS__SETKEYCREATE); else if (!strcmp(name, "sockcreate")) - error = task_has_perm(current, p, PROCESS__SETSOCKCREATE); + error = current_has_perm(p, PROCESS__SETSOCKCREATE); else if (!strcmp(name, "current")) - error = task_has_perm(current, p, PROCESS__SETCURRENT); + error = current_has_perm(p, PROCESS__SETCURRENT); else error = -EINVAL; if (error) @@ -5153,82 +5340,85 @@ static int selinux_setprocattr(struct task_struct *p, size--; } error = security_context_to_sid(value, size, &sid); + if (error == -EINVAL && !strcmp(name, "fscreate")) { + if (!capable(CAP_MAC_ADMIN)) + return error; + error = security_context_to_sid_force(value, size, + &sid); + } if (error) return error; } + new = prepare_creds(); + if (!new) + return -ENOMEM; + /* Permission checking based on the specified context is performed during the actual operation (execve, open/mkdir/...), when we know the full context of the - operation. See selinux_bprm_set_security for the execve + operation. See selinux_bprm_set_creds for the execve checks and may_create for the file creation checks. The operation will then fail if the context is not permitted. */ - tsec = p->security; - if (!strcmp(name, "exec")) + tsec = new->security; + if (!strcmp(name, "exec")) { tsec->exec_sid = sid; - else if (!strcmp(name, "fscreate")) + } else if (!strcmp(name, "fscreate")) { tsec->create_sid = sid; - else if (!strcmp(name, "keycreate")) { + } else if (!strcmp(name, "keycreate")) { error = may_create_key(sid, p); if (error) - return error; + goto abort_change; tsec->keycreate_sid = sid; - } else if (!strcmp(name, "sockcreate")) + } else if (!strcmp(name, "sockcreate")) { tsec->sockcreate_sid = sid; - else if (!strcmp(name, "current")) { - struct av_decision avd; - + } else if (!strcmp(name, "current")) { + error = -EINVAL; if (sid == 0) - return -EINVAL; + goto abort_change; /* Only allow single threaded processes to change context */ - if (atomic_read(&p->mm->mm_users) != 1) { - struct task_struct *g, *t; - struct mm_struct *mm = p->mm; - read_lock(&tasklist_lock); - do_each_thread(g, t) - if (t->mm == mm && t != p) { - read_unlock(&tasklist_lock); - return -EPERM; - } - while_each_thread(g, t); - read_unlock(&tasklist_lock); + error = -EPERM; + if (!is_single_threaded(p)) { + error = security_bounded_transition(tsec->sid, sid); + if (error) + goto abort_change; } /* Check permissions for the transition. */ error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, PROCESS__DYNTRANSITION, NULL); if (error) - return error; + goto abort_change; /* Check for ptracing, and update the task SID if ok. Otherwise, leave SID unchanged and fail. */ + ptsid = 0; task_lock(p); - rcu_read_lock(); - tracer = task_tracer_task(p); - if (tracer != NULL) { - struct task_security_struct *ptsec = tracer->security; - u32 ptsid = ptsec->sid; - rcu_read_unlock(); - error = avc_has_perm_noaudit(ptsid, sid, - SECCLASS_PROCESS, - PROCESS__PTRACE, 0, &avd); - if (!error) - tsec->sid = sid; - task_unlock(p); - avc_audit(ptsid, sid, SECCLASS_PROCESS, - PROCESS__PTRACE, &avd, error, NULL); + tracer = tracehook_tracer_task(p); + if (tracer) + ptsid = task_sid(tracer); + task_unlock(p); + + if (tracer) { + error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, + PROCESS__PTRACE, NULL); if (error) - return error; - } else { - rcu_read_unlock(); - tsec->sid = sid; - task_unlock(p); + goto abort_change; } - } else - return -EINVAL; + tsec->sid = sid; + } else { + error = -EINVAL; + goto abort_change; + } + + commit_creds(new); return size; + +abort_change: + abort_creds(new); + return error; } static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) @@ -5236,7 +5426,7 @@ static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) return security_sid_to_context(secid, secdata, seclen); } -static int selinux_secctx_to_secid(char *secdata, u32 seclen, u32 *secid) +static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) { return security_context_to_sid(secdata, seclen, secid); } @@ -5248,22 +5438,23 @@ static void selinux_release_secctx(char *secdata, u32 seclen) #ifdef CONFIG_KEYS -static int selinux_key_alloc(struct key *k, struct task_struct *tsk, +static int selinux_key_alloc(struct key *k, const struct cred *cred, unsigned long flags) { - struct task_security_struct *tsec = tsk->security; + const struct task_security_struct *tsec; struct key_security_struct *ksec; ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); if (!ksec) return -ENOMEM; + tsec = cred->security; if (tsec->keycreate_sid) ksec->sid = tsec->keycreate_sid; else ksec->sid = tsec->sid; - k->security = ksec; + k->security = ksec; return 0; } @@ -5276,17 +5467,12 @@ static void selinux_key_free(struct key *k) } static int selinux_key_permission(key_ref_t key_ref, - struct task_struct *ctx, - key_perm_t perm) + const struct cred *cred, + key_perm_t perm) { struct key *key; - struct task_security_struct *tsec; struct key_security_struct *ksec; - - key = key_ref_to_ptr(key_ref); - - tsec = ctx->security; - ksec = key->security; + u32 sid; /* if no specific permissions are requested, we skip the permission check. No serious, additional covert channels @@ -5294,8 +5480,26 @@ static int selinux_key_permission(key_ref_t key_ref, if (perm == 0) return 0; - return avc_has_perm(tsec->sid, ksec->sid, - SECCLASS_KEY, perm, NULL); + sid = cred_sid(cred); + + key = key_ref_to_ptr(key_ref); + ksec = key->security; + + return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL); +} + +static int selinux_key_getsecurity(struct key *key, char **_buffer) +{ + struct key_security_struct *ksec = key->security; + char *context = NULL; + unsigned len; + int rc; + + rc = security_sid_to_context(ksec->sid, &context, &len); + if (!rc) + rc = len; + *_buffer = context; + return rc; } #endif @@ -5303,10 +5507,10 @@ static int selinux_key_permission(key_ref_t key_ref, static struct security_operations selinux_ops = { .name = "selinux", - .ptrace = selinux_ptrace, + .ptrace_may_access = selinux_ptrace_may_access, + .ptrace_traceme = selinux_ptrace_traceme, .capget = selinux_capget, - .capset_check = selinux_capset_check, - .capset_set = selinux_capset_set, + .capset = selinux_capset, .sysctl = selinux_sysctl, .capable = selinux_capable, .quotactl = selinux_quotactl, @@ -5317,22 +5521,19 @@ static struct security_operations selinux_ops = { .netlink_send = selinux_netlink_send, .netlink_recv = selinux_netlink_recv, - .bprm_alloc_security = selinux_bprm_alloc_security, - .bprm_free_security = selinux_bprm_free_security, - .bprm_apply_creds = selinux_bprm_apply_creds, - .bprm_post_apply_creds = selinux_bprm_post_apply_creds, - .bprm_set_security = selinux_bprm_set_security, - .bprm_check_security = selinux_bprm_check_security, + .bprm_set_creds = selinux_bprm_set_creds, + .bprm_committing_creds = selinux_bprm_committing_creds, + .bprm_committed_creds = selinux_bprm_committed_creds, .bprm_secureexec = selinux_bprm_secureexec, .sb_alloc_security = selinux_sb_alloc_security, .sb_free_security = selinux_sb_free_security, .sb_copy_data = selinux_sb_copy_data, .sb_kern_mount = selinux_sb_kern_mount, + .sb_show_options = selinux_sb_show_options, .sb_statfs = selinux_sb_statfs, .sb_mount = selinux_mount, .sb_umount = selinux_umount, - .sb_get_mnt_opts = selinux_get_mnt_opts, .sb_set_mnt_opts = selinux_set_mnt_opts, .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, .sb_parse_opts_str = selinux_parse_opts_str, @@ -5364,7 +5565,7 @@ static struct security_operations selinux_ops = { .inode_listsecurity = selinux_inode_listsecurity, .inode_need_killpriv = selinux_inode_need_killpriv, .inode_killpriv = selinux_inode_killpriv, - .inode_getsecid = selinux_inode_getsecid, + .inode_getsecid = selinux_inode_getsecid, .file_permission = selinux_file_permission, .file_alloc_security = selinux_file_alloc_security, @@ -5381,10 +5582,12 @@ static struct security_operations selinux_ops = { .dentry_open = selinux_dentry_open, .task_create = selinux_task_create, - .task_alloc_security = selinux_task_alloc_security, - .task_free_security = selinux_task_free_security, + .cred_free = selinux_cred_free, + .cred_prepare = selinux_cred_prepare, + .kernel_act_as = selinux_kernel_act_as, + .kernel_create_files_as = selinux_kernel_create_files_as, .task_setuid = selinux_task_setuid, - .task_post_setuid = selinux_task_post_setuid, + .task_fix_setuid = selinux_task_fix_setuid, .task_setgid = selinux_task_setgid, .task_setpgid = selinux_task_setpgid, .task_getpgid = selinux_task_getpgid, @@ -5401,11 +5604,10 @@ static struct security_operations selinux_ops = { .task_kill = selinux_task_kill, .task_wait = selinux_task_wait, .task_prctl = selinux_task_prctl, - .task_reparent_to_init = selinux_task_reparent_to_init, .task_to_inode = selinux_task_to_inode, .ipc_permission = selinux_ipc_permission, - .ipc_getsecid = selinux_ipc_getsecid, + .ipc_getsecid = selinux_ipc_getsecid, .msg_msg_alloc_security = selinux_msg_msg_alloc_security, .msg_msg_free_security = selinux_msg_msg_free_security, @@ -5429,8 +5631,6 @@ static struct security_operations selinux_ops = { .sem_semctl = selinux_sem_semctl, .sem_semop = selinux_sem_semop, - .register_security = selinux_register_security, - .d_instantiate = selinux_d_instantiate, .getprocattr = selinux_getprocattr, @@ -5486,6 +5686,7 @@ static struct security_operations selinux_ops = { .key_alloc = selinux_key_alloc, .key_free = selinux_key_free, .key_permission = selinux_key_permission, + .key_getsecurity = selinux_key_getsecurity, #endif #ifdef CONFIG_AUDIT @@ -5498,8 +5699,6 @@ static struct security_operations selinux_ops = { static __init int selinux_init(void) { - struct task_security_struct *tsec; - if (!security_module_enable(&selinux_ops)) { selinux_enabled = 0; return 0; @@ -5513,17 +5712,14 @@ static __init int selinux_init(void) printk(KERN_INFO "SELinux: Initializing.\n"); /* Set the security state for the initial task. */ - if (task_alloc_security(current)) - panic("SELinux: Failed to initialize initial task.\n"); - tsec = current->security; - tsec->osid = tsec->sid = SECINITSID_KERNEL; + cred_init_security(); sel_inode_cache = kmem_cache_create("selinux_inode_security", sizeof(struct inode_security_struct), 0, SLAB_PANIC, NULL); avc_init(); - original_ops = secondary_ops = security_ops; + secondary_ops = security_ops; if (!secondary_ops) panic("SELinux: No initial security operations\n"); if (register_security(&selinux_ops)) @@ -5534,14 +5730,6 @@ static __init int selinux_init(void) else printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); -#ifdef CONFIG_KEYS - /* Add security information to initial keyrings */ - selinux_key_alloc(&root_user_keyring, current, - KEY_ALLOC_NOT_IN_QUOTA); - selinux_key_alloc(&root_session_keyring, current, - KEY_ALLOC_NOT_IN_QUOTA); -#endif - return 0; } @@ -5596,6 +5784,13 @@ static struct nf_hook_ops selinux_ipv4_ops[] = { .pf = PF_INET, .hooknum = NF_INET_FORWARD, .priority = NF_IP_PRI_SELINUX_FIRST, + }, + { + .hook = selinux_ipv4_output, + .owner = THIS_MODULE, + .pf = PF_INET, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_SELINUX_FIRST, } }; @@ -5623,27 +5818,20 @@ static struct nf_hook_ops selinux_ipv6_ops[] = { static int __init selinux_nf_ip_init(void) { int err = 0; - u32 iter; if (!selinux_enabled) goto out; printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); - for (iter = 0; iter < ARRAY_SIZE(selinux_ipv4_ops); iter++) { - err = nf_register_hook(&selinux_ipv4_ops[iter]); - if (err) - panic("SELinux: nf_register_hook for IPv4: error %d\n", - err); - } + err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); + if (err) + panic("SELinux: nf_register_hooks for IPv4: error %d\n", err); #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) - for (iter = 0; iter < ARRAY_SIZE(selinux_ipv6_ops); iter++) { - err = nf_register_hook(&selinux_ipv6_ops[iter]); - if (err) - panic("SELinux: nf_register_hook for IPv6: error %d\n", - err); - } + err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); + if (err) + panic("SELinux: nf_register_hooks for IPv6: error %d\n", err); #endif /* IPV6 */ out: @@ -5655,15 +5843,11 @@ __initcall(selinux_nf_ip_init); #ifdef CONFIG_SECURITY_SELINUX_DISABLE static void selinux_nf_ip_exit(void) { - u32 iter; - printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); - for (iter = 0; iter < ARRAY_SIZE(selinux_ipv4_ops); iter++) - nf_unregister_hook(&selinux_ipv4_ops[iter]); + nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) - for (iter = 0; iter < ARRAY_SIZE(selinux_ipv6_ops); iter++) - nf_unregister_hook(&selinux_ipv6_ops[iter]); + nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); #endif /* IPV6 */ } #endif