X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fproc%2Fbase.c;h=7b1ded63fa63b494f904b65840449c82fb5f20d8;hb=00977a59b951207d38380c75f03a36829950265c;hp=b18f3773dd4360e33cff99366794d0d3900c10f5;hpb=0804ef4b0de7121261f77c565b20a11ac694e877;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/proc/base.c b/fs/proc/base.c index b18f377..7b1ded6 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -59,7 +59,7 @@ #include #include #include -#include +#include #include #include #include @@ -71,6 +71,8 @@ #include #include #include +#include +#include #include "internal.h" /* NOTE: @@ -83,262 +85,44 @@ * in /proc for a task before it execs a suid executable. */ -/* - * For hysterical raisins we keep the same inumbers as in the old procfs. - * Feel free to change the macro below - just keep the range distinct from - * inumbers of the rest of procfs (currently those are in 0x0000--0xffff). - * As soon as we'll get a separate superblock we will be able to forget - * about magical ranges too. - */ - -#define fake_ino(pid,ino) (((pid)<<16)|(ino)) - -enum pid_directory_inos { - PROC_TGID_INO = 2, - PROC_TGID_TASK, - PROC_TGID_STATUS, - PROC_TGID_MEM, -#ifdef CONFIG_SECCOMP - PROC_TGID_SECCOMP, -#endif - PROC_TGID_CWD, - PROC_TGID_ROOT, - PROC_TGID_EXE, - PROC_TGID_FD, - PROC_TGID_ENVIRON, - PROC_TGID_AUXV, - PROC_TGID_CMDLINE, - PROC_TGID_STAT, - PROC_TGID_STATM, - PROC_TGID_MAPS, - PROC_TGID_NUMA_MAPS, - PROC_TGID_MOUNTS, - PROC_TGID_MOUNTSTATS, - PROC_TGID_WCHAN, -#ifdef CONFIG_MMU - PROC_TGID_SMAPS, -#endif -#ifdef CONFIG_SCHEDSTATS - PROC_TGID_SCHEDSTAT, -#endif -#ifdef CONFIG_CPUSETS - PROC_TGID_CPUSET, -#endif -#ifdef CONFIG_SECURITY - PROC_TGID_ATTR, - PROC_TGID_ATTR_CURRENT, - PROC_TGID_ATTR_PREV, - PROC_TGID_ATTR_EXEC, - PROC_TGID_ATTR_FSCREATE, - PROC_TGID_ATTR_KEYCREATE, - PROC_TGID_ATTR_SOCKCREATE, -#endif -#ifdef CONFIG_AUDITSYSCALL - PROC_TGID_LOGINUID, -#endif - PROC_TGID_OOM_SCORE, - PROC_TGID_OOM_ADJUST, - PROC_TID_INO, - PROC_TID_STATUS, - PROC_TID_MEM, -#ifdef CONFIG_SECCOMP - PROC_TID_SECCOMP, -#endif - PROC_TID_CWD, - PROC_TID_ROOT, - PROC_TID_EXE, - PROC_TID_FD, - PROC_TID_ENVIRON, - PROC_TID_AUXV, - PROC_TID_CMDLINE, - PROC_TID_STAT, - PROC_TID_STATM, - PROC_TID_MAPS, - PROC_TID_NUMA_MAPS, - PROC_TID_MOUNTS, - PROC_TID_MOUNTSTATS, - PROC_TID_WCHAN, -#ifdef CONFIG_MMU - PROC_TID_SMAPS, -#endif -#ifdef CONFIG_SCHEDSTATS - PROC_TID_SCHEDSTAT, -#endif -#ifdef CONFIG_CPUSETS - PROC_TID_CPUSET, -#endif -#ifdef CONFIG_SECURITY - PROC_TID_ATTR, - PROC_TID_ATTR_CURRENT, - PROC_TID_ATTR_PREV, - PROC_TID_ATTR_EXEC, - PROC_TID_ATTR_FSCREATE, - PROC_TID_ATTR_KEYCREATE, - PROC_TID_ATTR_SOCKCREATE, -#endif -#ifdef CONFIG_AUDITSYSCALL - PROC_TID_LOGINUID, -#endif - PROC_TID_OOM_SCORE, - PROC_TID_OOM_ADJUST, - - /* Add new entries before this */ - PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */ -}; /* Worst case buffer size needed for holding an integer. */ -#define PROC_NUMBUF 10 +#define PROC_NUMBUF 13 struct pid_entry { - int type; int len; char *name; mode_t mode; + struct inode_operations *iop; + const struct file_operations *fop; + union proc_op op; }; -#define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)} - -static struct pid_entry tgid_base_stuff[] = { - E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO), - E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), - E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR), - E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR), - E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO), - E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), - E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO), - E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO), - E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO), -#ifdef CONFIG_NUMA - E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), -#endif - E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), -#ifdef CONFIG_SECCOMP - E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), -#endif - E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO), - E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO), - E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO), - E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO), - E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR), -#ifdef CONFIG_MMU - E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO), -#endif -#ifdef CONFIG_SECURITY - E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), -#endif -#ifdef CONFIG_KALLSYMS - E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO), -#endif -#ifdef CONFIG_SCHEDSTATS - E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO), -#endif -#ifdef CONFIG_CPUSETS - E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO), -#endif - E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), - E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR), -#ifdef CONFIG_AUDITSYSCALL - E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), -#endif - {0,0,NULL,0} -}; -static struct pid_entry tid_base_stuff[] = { - E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), - E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR), - E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR), - E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO), - E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), - E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO), - E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO), - E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO), -#ifdef CONFIG_NUMA - E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), -#endif - E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), -#ifdef CONFIG_SECCOMP - E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), -#endif - E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO), - E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO), - E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO), - E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO), -#ifdef CONFIG_MMU - E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO), -#endif -#ifdef CONFIG_SECURITY - E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), -#endif -#ifdef CONFIG_KALLSYMS - E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO), -#endif -#ifdef CONFIG_SCHEDSTATS - E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO), -#endif -#ifdef CONFIG_CPUSETS - E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO), -#endif - E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), - E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR), -#ifdef CONFIG_AUDITSYSCALL - E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), -#endif - {0,0,NULL,0} -}; - -#ifdef CONFIG_SECURITY -static struct pid_entry tgid_attr_stuff[] = { - E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), - E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TGID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TGID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO), - {0,0,NULL,0} -}; -static struct pid_entry tid_attr_stuff[] = { - E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), - E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO), - E(PROC_TID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO), - {0,0,NULL,0} -}; -#endif - -#undef E - -static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) -{ - struct task_struct *task = get_proc_task(inode); - struct files_struct *files = NULL; - struct file *file; - int fd = proc_fd(inode); - - if (task) { - files = get_files_struct(task); - put_task_struct(task); - } - if (files) { - /* - * We are not taking a ref to the file structure, so we must - * hold ->file_lock. - */ - spin_lock(&files->file_lock); - file = fcheck_files(files, fd); - if (file) { - *mnt = mntget(file->f_vfsmnt); - *dentry = dget(file->f_dentry); - spin_unlock(&files->file_lock); - put_files_struct(files); - return 0; - } - spin_unlock(&files->file_lock); - put_files_struct(files); - } - return -ENOENT; +#define NOD(NAME, MODE, IOP, FOP, OP) { \ + .len = sizeof(NAME) - 1, \ + .name = (NAME), \ + .mode = MODE, \ + .iop = IOP, \ + .fop = FOP, \ + .op = OP, \ } +#define DIR(NAME, MODE, OTYPE) \ + NOD(NAME, (S_IFDIR|(MODE)), \ + &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ + {} ) +#define LNK(NAME, OTYPE) \ + NOD(NAME, (S_IFLNK|S_IRWXUGO), \ + &proc_pid_link_inode_operations, NULL, \ + { .proc_get_link = &proc_##OTYPE##_link } ) +#define REG(NAME, MODE, OTYPE) \ + NOD(NAME, (S_IFREG|(MODE)), NULL, \ + &proc_##OTYPE##_operations, {}) +#define INF(NAME, MODE, OTYPE) \ + NOD(NAME, (S_IFREG|(MODE)), \ + NULL, &proc_info_file_operations, \ + { .proc_read = &proc_##OTYPE } ) + static struct fs_struct *get_fs_struct(struct task_struct *task) { struct fs_struct *fs; @@ -581,33 +365,35 @@ struct proc_mounts { static int mounts_open(struct inode *inode, struct file *file) { struct task_struct *task = get_proc_task(inode); - struct namespace *namespace = NULL; + struct mnt_namespace *ns = NULL; struct proc_mounts *p; int ret = -EINVAL; if (task) { task_lock(task); - namespace = task->namespace; - if (namespace) - get_namespace(namespace); + if (task->nsproxy) { + ns = task->nsproxy->mnt_ns; + if (ns) + get_mnt_ns(ns); + } task_unlock(task); put_task_struct(task); } - if (namespace) { + if (ns) { ret = -ENOMEM; p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); if (p) { file->private_data = &p->m; ret = seq_open(file, &mounts_op); if (!ret) { - p->m.private = namespace; - p->event = namespace->event; + p->m.private = ns; + p->event = ns->event; return 0; } kfree(p); } - put_namespace(namespace); + put_mnt_ns(ns); } return ret; } @@ -615,15 +401,15 @@ static int mounts_open(struct inode *inode, struct file *file) static int mounts_release(struct inode *inode, struct file *file) { struct seq_file *m = file->private_data; - struct namespace *namespace = m->private; - put_namespace(namespace); + struct mnt_namespace *ns = m->private; + put_mnt_ns(ns); return seq_release(inode, file); } static unsigned mounts_poll(struct file *file, poll_table *wait) { struct proc_mounts *p = file->private_data; - struct namespace *ns = p->m.private; + struct mnt_namespace *ns = p->m.private; unsigned res = 0; poll_wait(file, &ns->poll, wait); @@ -638,7 +424,7 @@ static unsigned mounts_poll(struct file *file, poll_table *wait) return res; } -static struct file_operations proc_mounts_operations = { +static const struct file_operations proc_mounts_operations = { .open = mounts_open, .read = seq_read, .llseek = seq_lseek, @@ -653,20 +439,21 @@ static int mountstats_open(struct inode *inode, struct file *file) if (!ret) { struct seq_file *m = file->private_data; - struct namespace *namespace = NULL; + struct mnt_namespace *mnt_ns = NULL; struct task_struct *task = get_proc_task(inode); if (task) { task_lock(task); - namespace = task->namespace; - if (namespace) - get_namespace(namespace); + if (task->nsproxy) + mnt_ns = task->nsproxy->mnt_ns; + if (mnt_ns) + get_mnt_ns(mnt_ns); task_unlock(task); put_task_struct(task); } - if (namespace) - m->private = namespace; + if (mnt_ns) + m->private = mnt_ns; else { seq_release(inode, file); ret = -EINVAL; @@ -675,7 +462,7 @@ static int mountstats_open(struct inode *inode, struct file *file) return ret; } -static struct file_operations proc_mountstats_operations = { +static const struct file_operations proc_mountstats_operations = { .open = mountstats_open, .read = seq_read, .llseek = seq_lseek, @@ -687,7 +474,7 @@ static struct file_operations proc_mountstats_operations = { static ssize_t proc_info_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { - struct inode * inode = file->f_dentry->d_inode; + struct inode * inode = file->f_path.dentry->d_inode; unsigned long page; ssize_t length; struct task_struct *task = get_proc_task(inode); @@ -714,7 +501,7 @@ out_no_task: return length; } -static struct file_operations proc_info_file_operations = { +static const struct file_operations proc_info_file_operations = { .read = proc_info_read, }; @@ -727,7 +514,7 @@ static int mem_open(struct inode* inode, struct file* file) static ssize_t mem_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { - struct task_struct *task = get_proc_task(file->f_dentry->d_inode); + struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); char *page; unsigned long src = *ppos; int ret = -ESRCH; @@ -799,7 +586,7 @@ static ssize_t mem_write(struct file * file, const char * buf, { int copied; char *page; - struct task_struct *task = get_proc_task(file->f_dentry->d_inode); + struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); unsigned long dst = *ppos; copied = -ESRCH; @@ -859,7 +646,7 @@ static loff_t mem_lseek(struct file * file, loff_t offset, int orig) return file->f_pos; } -static struct file_operations proc_mem_operations = { +static const struct file_operations proc_mem_operations = { .llseek = mem_lseek, .read = mem_read, .write = mem_write, @@ -869,7 +656,7 @@ static struct file_operations proc_mem_operations = { static ssize_t oom_adjust_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - struct task_struct *task = get_proc_task(file->f_dentry->d_inode); + struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); char buffer[PROC_NUMBUF]; size_t len; int oom_adjust; @@ -898,21 +685,24 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf, char buffer[PROC_NUMBUF], *end; int oom_adjust; - if (!capable(CAP_SYS_RESOURCE)) - return -EPERM; memset(buffer, 0, sizeof(buffer)); if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) return -EFAULT; oom_adjust = simple_strtol(buffer, &end, 0); - if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE) + if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && + oom_adjust != OOM_DISABLE) return -EINVAL; if (*end == '\n') end++; - task = get_proc_task(file->f_dentry->d_inode); + task = get_proc_task(file->f_path.dentry->d_inode); if (!task) return -ESRCH; + if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { + put_task_struct(task); + return -EACCES; + } task->oomkilladj = oom_adjust; put_task_struct(task); if (end - buffer == 0) @@ -920,7 +710,7 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf, return end - buffer; } -static struct file_operations proc_oom_adjust_operations = { +static const struct file_operations proc_oom_adjust_operations = { .read = oom_adjust_read, .write = oom_adjust_write, }; @@ -930,7 +720,7 @@ static struct file_operations proc_oom_adjust_operations = { static ssize_t proc_loginuid_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { - struct inode * inode = file->f_dentry->d_inode; + struct inode * inode = file->f_path.dentry->d_inode; struct task_struct *task = get_proc_task(inode); ssize_t length; char tmpbuf[TMPBUFLEN]; @@ -946,7 +736,7 @@ static ssize_t proc_loginuid_read(struct file * file, char __user * buf, static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { - struct inode * inode = file->f_dentry->d_inode; + struct inode * inode = file->f_path.dentry->d_inode; char *page, *tmp; ssize_t length; uid_t loginuid; @@ -987,7 +777,7 @@ out_free_page: return length; } -static struct file_operations proc_loginuid_operations = { +static const struct file_operations proc_loginuid_operations = { .read = proc_loginuid_read, .write = proc_loginuid_write, }; @@ -1059,12 +849,71 @@ out_no_task: return result; } -static struct file_operations proc_seccomp_operations = { +static const struct file_operations proc_seccomp_operations = { .read = seccomp_read, .write = seccomp_write, }; #endif /* CONFIG_SECCOMP */ +#ifdef CONFIG_FAULT_INJECTION +static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, + size_t count, loff_t *ppos) +{ + struct task_struct *task = get_proc_task(file->f_dentry->d_inode); + char buffer[PROC_NUMBUF]; + size_t len; + int make_it_fail; + loff_t __ppos = *ppos; + + if (!task) + return -ESRCH; + make_it_fail = task->make_it_fail; + put_task_struct(task); + + len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); + if (__ppos >= len) + return 0; + if (count > len-__ppos) + count = len-__ppos; + if (copy_to_user(buf, buffer + __ppos, count)) + return -EFAULT; + *ppos = __ppos + count; + return count; +} + +static ssize_t proc_fault_inject_write(struct file * file, + const char __user * buf, size_t count, loff_t *ppos) +{ + struct task_struct *task; + char buffer[PROC_NUMBUF], *end; + int make_it_fail; + + if (!capable(CAP_SYS_RESOURCE)) + return -EPERM; + memset(buffer, 0, sizeof(buffer)); + if (count > sizeof(buffer) - 1) + count = sizeof(buffer) - 1; + if (copy_from_user(buffer, buf, count)) + return -EFAULT; + make_it_fail = simple_strtol(buffer, &end, 0); + if (*end == '\n') + end++; + task = get_proc_task(file->f_dentry->d_inode); + if (!task) + return -ESRCH; + task->make_it_fail = make_it_fail; + put_task_struct(task); + if (end - buffer == 0) + return -EIO; + return end - buffer; +} + +static const struct file_operations proc_fault_inject_operations = { + .read = proc_fault_inject_read, + .write = proc_fault_inject_write, +}; +#endif + static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) { struct inode *inode = dentry->d_inode; @@ -1137,202 +986,85 @@ static struct inode_operations proc_pid_link_inode_operations = { .setattr = proc_setattr, }; -static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir) + +/* building an inode */ + +static int task_dumpable(struct task_struct *task) { - struct dentry *dentry = filp->f_dentry; - struct inode *inode = dentry->d_inode; - struct task_struct *p = get_proc_task(inode); - unsigned int fd, tid, ino; - int retval; - char buf[PROC_NUMBUF]; - struct files_struct * files; - struct fdtable *fdt; + int dumpable = 0; + struct mm_struct *mm; - retval = -ENOENT; - if (!p) - goto out_no_task; - retval = 0; - tid = p->pid; + task_lock(task); + mm = task->mm; + if (mm) + dumpable = mm->dumpable; + task_unlock(task); + if(dumpable == 1) + return 1; + return 0; +} - fd = filp->f_pos; - switch (fd) { - case 0: - if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) - goto out; - filp->f_pos++; - case 1: - ino = parent_ino(dentry); - if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) - goto out; - filp->f_pos++; - default: - files = get_files_struct(p); - if (!files) - goto out; - rcu_read_lock(); - fdt = files_fdtable(files); - for (fd = filp->f_pos-2; - fd < fdt->max_fds; - fd++, filp->f_pos++) { - unsigned int i,j; - if (!fcheck_files(files, fd)) - continue; - rcu_read_unlock(); +static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) +{ + struct inode * inode; + struct proc_inode *ei; - j = PROC_NUMBUF; - i = fd; - do { - j--; - buf[j] = '0' + (i % 10); - i /= 10; - } while (i); + /* We need a new inode */ - ino = fake_ino(tid, PROC_TID_FD_DIR + fd); - if (filldir(dirent, buf+j, PROC_NUMBUF-j, fd+2, ino, DT_LNK) < 0) { - rcu_read_lock(); - break; - } - rcu_read_lock(); - } - rcu_read_unlock(); - put_files_struct(files); + inode = new_inode(sb); + if (!inode) + goto out; + + /* Common stuff */ + ei = PROC_I(inode); + inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; + inode->i_op = &proc_def_inode_operations; + + /* + * grab the reference to task. + */ + ei->pid = get_task_pid(task, PIDTYPE_PID); + if (!ei->pid) + goto out_unlock; + + inode->i_uid = 0; + inode->i_gid = 0; + if (task_dumpable(task)) { + inode->i_uid = task->euid; + inode->i_gid = task->egid; } + security_task_to_inode(task, inode); + out: - put_task_struct(p); -out_no_task: - return retval; + return inode; + +out_unlock: + iput(inode); + return NULL; } -static int proc_pident_readdir(struct file *filp, - void *dirent, filldir_t filldir, - struct pid_entry *ents, unsigned int nents) +static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { - int i; - int pid; - struct dentry *dentry = filp->f_dentry; struct inode *inode = dentry->d_inode; - struct task_struct *task = get_proc_task(inode); - struct pid_entry *p; - ino_t ino; - int ret; - - ret = -ENOENT; - if (!task) - goto out; + struct task_struct *task; + generic_fillattr(inode, stat); - ret = 0; - pid = task->pid; - put_task_struct(task); - i = filp->f_pos; - switch (i) { - case 0: - ino = inode->i_ino; - if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) - goto out; - i++; - filp->f_pos++; - /* fall through */ - case 1: - ino = parent_ino(dentry); - if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) - goto out; - i++; - filp->f_pos++; - /* fall through */ - default: - i -= 2; - if (i >= nents) { - ret = 1; - goto out; - } - p = ents + i; - while (p->name) { - if (filldir(dirent, p->name, p->len, filp->f_pos, - fake_ino(pid, p->type), p->mode >> 12) < 0) - goto out; - filp->f_pos++; - p++; + rcu_read_lock(); + stat->uid = 0; + stat->gid = 0; + task = pid_task(proc_pid(inode), PIDTYPE_PID); + if (task) { + if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || + task_dumpable(task)) { + stat->uid = task->euid; + stat->gid = task->egid; } } - - ret = 1; -out: - return ret; -} - -static int proc_tgid_base_readdir(struct file * filp, - void * dirent, filldir_t filldir) -{ - return proc_pident_readdir(filp,dirent,filldir, - tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); -} - -static int proc_tid_base_readdir(struct file * filp, - void * dirent, filldir_t filldir) -{ - return proc_pident_readdir(filp,dirent,filldir, - tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); -} - -/* building an inode */ - -static int task_dumpable(struct task_struct *task) -{ - int dumpable = 0; - struct mm_struct *mm; - - task_lock(task); - mm = task->mm; - if (mm) - dumpable = mm->dumpable; - task_unlock(task); - if(dumpable == 1) - return 1; + rcu_read_unlock(); return 0; } - -static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino) -{ - struct inode * inode; - struct proc_inode *ei; - - /* We need a new inode */ - - inode = new_inode(sb); - if (!inode) - goto out; - - /* Common stuff */ - ei = PROC_I(inode); - inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; - inode->i_ino = fake_ino(task->pid, ino); - inode->i_op = &proc_def_inode_operations; - - /* - * grab the reference to task. - */ - ei->pid = get_pid(task->pids[PIDTYPE_PID].pid); - if (!ei->pid) - goto out_unlock; - - inode->i_uid = 0; - inode->i_gid = 0; - if (task_dumpable(task)) { - inode->i_uid = task->euid; - inode->i_gid = task->egid; - } - security_task_to_inode(task, inode); - -out: - return inode; - -out_unlock: - iput(inode); - return NULL; -} - /* dentry stuff */ /* @@ -1372,25 +1104,130 @@ static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) return 0; } -static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) +static int pid_delete_dentry(struct dentry * dentry) { - struct inode *inode = dentry->d_inode; - struct task_struct *task; - generic_fillattr(inode, stat); + /* Is the task we represent dead? + * If so, then don't put the dentry on the lru list, + * kill it immediately. + */ + return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; +} + +static struct dentry_operations pid_dentry_operations = +{ + .d_revalidate = pid_revalidate, + .d_delete = pid_delete_dentry, +}; + +/* Lookups */ + +typedef struct dentry *instantiate_t(struct inode *, struct dentry *, struct task_struct *, void *); + +/* + * Fill a directory entry. + * + * If possible create the dcache entry and derive our inode number and + * file type from dcache entry. + * + * Since all of the proc inode numbers are dynamically generated, the inode + * numbers do not exist until the inode is cache. This means creating the + * the dcache entry in readdir is necessary to keep the inode numbers + * reported by readdir in sync with the inode numbers reported + * by stat. + */ +static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, + char *name, int len, + instantiate_t instantiate, struct task_struct *task, void *ptr) +{ + struct dentry *child, *dir = filp->f_path.dentry; + struct inode *inode; + struct qstr qname; + ino_t ino = 0; + unsigned type = DT_UNKNOWN; + + qname.name = name; + qname.len = len; + qname.hash = full_name_hash(name, len); + + child = d_lookup(dir, &qname); + if (!child) { + struct dentry *new; + new = d_alloc(dir, &qname); + if (new) { + child = instantiate(dir->d_inode, new, task, ptr); + if (child) + dput(new); + else + child = new; + } + } + if (!child || IS_ERR(child) || !child->d_inode) + goto end_instantiate; + inode = child->d_inode; + if (inode) { + ino = inode->i_ino; + type = inode->i_mode >> 12; + } + dput(child); +end_instantiate: + if (!ino) + ino = find_inode_number(dir, &qname); + if (!ino) + ino = 1; + return filldir(dirent, name, len, filp->f_pos, ino, type); +} + +static unsigned name_to_int(struct dentry *dentry) +{ + const char *name = dentry->d_name.name; + int len = dentry->d_name.len; + unsigned n = 0; + + if (len > 1 && *name == '0') + goto out; + while (len-- > 0) { + unsigned c = *name++ - '0'; + if (c > 9) + goto out; + if (n >= (~0U-9)/10) + goto out; + n *= 10; + n += c; + } + return n; +out: + return ~0U; +} + +static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) +{ + struct task_struct *task = get_proc_task(inode); + struct files_struct *files = NULL; + struct file *file; + int fd = proc_fd(inode); - rcu_read_lock(); - stat->uid = 0; - stat->gid = 0; - task = pid_task(proc_pid(inode), PIDTYPE_PID); if (task) { - if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || - task_dumpable(task)) { - stat->uid = task->euid; - stat->gid = task->egid; + files = get_files_struct(task); + put_task_struct(task); + } + if (files) { + /* + * We are not taking a ref to the file structure, so we must + * hold ->file_lock. + */ + spin_lock(&files->file_lock); + file = fcheck_files(files, fd); + if (file) { + *mnt = mntget(file->f_path.mnt); + *dentry = dget(file->f_path.dentry); + spin_unlock(&files->file_lock); + put_files_struct(files); + return 0; } + spin_unlock(&files->file_lock); + put_files_struct(files); } - rcu_read_unlock(); - return 0; + return -ENOENT; } static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) @@ -1428,76 +1265,31 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) return 0; } -static int pid_delete_dentry(struct dentry * dentry) -{ - /* Is the task we represent dead? - * If so, then don't put the dentry on the lru list, - * kill it immediately. - */ - return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; -} - static struct dentry_operations tid_fd_dentry_operations = { .d_revalidate = tid_fd_revalidate, .d_delete = pid_delete_dentry, }; -static struct dentry_operations pid_dentry_operations = -{ - .d_revalidate = pid_revalidate, - .d_delete = pid_delete_dentry, -}; - -/* Lookups */ - -static unsigned name_to_int(struct dentry *dentry) +static struct dentry *proc_fd_instantiate(struct inode *dir, + struct dentry *dentry, struct task_struct *task, void *ptr) { - const char *name = dentry->d_name.name; - int len = dentry->d_name.len; - unsigned n = 0; + unsigned fd = *(unsigned *)ptr; + struct file *file; + struct files_struct *files; + struct inode *inode; + struct proc_inode *ei; + struct dentry *error = ERR_PTR(-ENOENT); - if (len > 1 && *name == '0') + inode = proc_pid_make_inode(dir->i_sb, task); + if (!inode) goto out; - while (len-- > 0) { - unsigned c = *name++ - '0'; - if (c > 9) - goto out; - if (n >= (~0U-9)/10) - goto out; - n *= 10; - n += c; - } - return n; -out: - return ~0U; -} - -/* SMP-safe */ -static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd) -{ - struct task_struct *task = get_proc_task(dir); - unsigned fd = name_to_int(dentry); - struct dentry *result = ERR_PTR(-ENOENT); - struct file * file; - struct files_struct * files; - struct inode *inode; - struct proc_inode *ei; - - if (!task) - goto out_no_task; - if (fd == ~0U) - goto out; - - inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd); - if (!inode) - goto out; - ei = PROC_I(inode); - ei->fd = fd; - files = get_files_struct(task); - if (!files) - goto out_unlock; - inode->i_mode = S_IFLNK; + ei = PROC_I(inode); + ei->fd = fd; + files = get_files_struct(task); + if (!files) + goto out_iput; + inode->i_mode = S_IFLNK; /* * We are not taking a ref to the file structure, so we must @@ -1506,13 +1298,14 @@ static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, spin_lock(&files->file_lock); file = fcheck_files(files, fd); if (!file) - goto out_unlock2; + goto out_unlock; if (file->f_mode & 1) inode->i_mode |= S_IRUSR | S_IXUSR; if (file->f_mode & 2) inode->i_mode |= S_IWUSR | S_IXUSR; spin_unlock(&files->file_lock); put_files_struct(files); + inode->i_op = &proc_pid_link_inode_operations; inode->i_size = 64; ei->op.proc_get_link = proc_fd_link; @@ -1520,32 +1313,104 @@ static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, d_add(dentry, inode); /* Close the race of the process dying before we return the dentry */ if (tid_fd_revalidate(dentry, NULL)) - result = NULL; -out: - put_task_struct(task); -out_no_task: - return result; + error = NULL; -out_unlock2: + out: + return error; +out_unlock: spin_unlock(&files->file_lock); put_files_struct(files); -out_unlock: +out_iput: iput(inode); goto out; } -static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir); -static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd); -static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); +static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd) +{ + struct task_struct *task = get_proc_task(dir); + unsigned fd = name_to_int(dentry); + struct dentry *result = ERR_PTR(-ENOENT); -static struct file_operations proc_fd_operations = { - .read = generic_read_dir, - .readdir = proc_readfd, -}; + if (!task) + goto out_no_task; + if (fd == ~0U) + goto out; + + result = proc_fd_instantiate(dir, dentry, task, &fd); +out: + put_task_struct(task); +out_no_task: + return result; +} + +static int proc_fd_fill_cache(struct file *filp, void *dirent, filldir_t filldir, + struct task_struct *task, int fd) +{ + char name[PROC_NUMBUF]; + int len = snprintf(name, sizeof(name), "%d", fd); + return proc_fill_cache(filp, dirent, filldir, name, len, + proc_fd_instantiate, task, &fd); +} -static struct file_operations proc_task_operations = { +static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir) +{ + struct dentry *dentry = filp->f_path.dentry; + struct inode *inode = dentry->d_inode; + struct task_struct *p = get_proc_task(inode); + unsigned int fd, tid, ino; + int retval; + struct files_struct * files; + struct fdtable *fdt; + + retval = -ENOENT; + if (!p) + goto out_no_task; + retval = 0; + tid = p->pid; + + fd = filp->f_pos; + switch (fd) { + case 0: + if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) + goto out; + filp->f_pos++; + case 1: + ino = parent_ino(dentry); + if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) + goto out; + filp->f_pos++; + default: + files = get_files_struct(p); + if (!files) + goto out; + rcu_read_lock(); + fdt = files_fdtable(files); + for (fd = filp->f_pos-2; + fd < fdt->max_fds; + fd++, filp->f_pos++) { + + if (!fcheck_files(files, fd)) + continue; + rcu_read_unlock(); + + if (proc_fd_fill_cache(filp, dirent, filldir, p, fd) < 0) { + rcu_read_lock(); + break; + } + rcu_read_lock(); + } + rcu_read_unlock(); + put_files_struct(files); + } +out: + put_task_struct(p); +out_no_task: + return retval; +} + +static const struct file_operations proc_fd_operations = { .read = generic_read_dir, - .readdir = proc_task_readdir, + .readdir = proc_readfd, }; /* @@ -1556,17 +1421,143 @@ static struct inode_operations proc_fd_inode_operations = { .setattr = proc_setattr, }; -static struct inode_operations proc_task_inode_operations = { - .lookup = proc_task_lookup, - .getattr = proc_task_getattr, - .setattr = proc_setattr, -}; +static struct dentry *proc_pident_instantiate(struct inode *dir, + struct dentry *dentry, struct task_struct *task, void *ptr) +{ + struct pid_entry *p = ptr; + struct inode *inode; + struct proc_inode *ei; + struct dentry *error = ERR_PTR(-EINVAL); + + inode = proc_pid_make_inode(dir->i_sb, task); + if (!inode) + goto out; + + ei = PROC_I(inode); + inode->i_mode = p->mode; + if (S_ISDIR(inode->i_mode)) + inode->i_nlink = 2; /* Use getattr to fix if necessary */ + if (p->iop) + inode->i_op = p->iop; + if (p->fop) + inode->i_fop = p->fop; + ei->op = p->op; + dentry->d_op = &pid_dentry_operations; + d_add(dentry, inode); + /* Close the race of the process dying before we return the dentry */ + if (pid_revalidate(dentry, NULL)) + error = NULL; +out: + return error; +} + +static struct dentry *proc_pident_lookup(struct inode *dir, + struct dentry *dentry, + struct pid_entry *ents, + unsigned int nents) +{ + struct inode *inode; + struct dentry *error; + struct task_struct *task = get_proc_task(dir); + struct pid_entry *p, *last; + + error = ERR_PTR(-ENOENT); + inode = NULL; + + if (!task) + goto out_no_task; + + /* + * Yes, it does not scale. And it should not. Don't add + * new entries into /proc// without very good reasons. + */ + last = &ents[nents - 1]; + for (p = ents; p <= last; p++) { + if (p->len != dentry->d_name.len) + continue; + if (!memcmp(dentry->d_name.name, p->name, p->len)) + break; + } + if (p > last) + goto out; + + error = proc_pident_instantiate(dir, dentry, task, p); +out: + put_task_struct(task); +out_no_task: + return error; +} + +static int proc_pident_fill_cache(struct file *filp, void *dirent, filldir_t filldir, + struct task_struct *task, struct pid_entry *p) +{ + return proc_fill_cache(filp, dirent, filldir, p->name, p->len, + proc_pident_instantiate, task, p); +} + +static int proc_pident_readdir(struct file *filp, + void *dirent, filldir_t filldir, + struct pid_entry *ents, unsigned int nents) +{ + int i; + int pid; + struct dentry *dentry = filp->f_path.dentry; + struct inode *inode = dentry->d_inode; + struct task_struct *task = get_proc_task(inode); + struct pid_entry *p, *last; + ino_t ino; + int ret; + + ret = -ENOENT; + if (!task) + goto out_no_task; + + ret = 0; + pid = task->pid; + i = filp->f_pos; + switch (i) { + case 0: + ino = inode->i_ino; + if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) + goto out; + i++; + filp->f_pos++; + /* fall through */ + case 1: + ino = parent_ino(dentry); + if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) + goto out; + i++; + filp->f_pos++; + /* fall through */ + default: + i -= 2; + if (i >= nents) { + ret = 1; + goto out; + } + p = ents + i; + last = &ents[nents - 1]; + while (p <= last) { + if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) + goto out; + filp->f_pos++; + p++; + } + } + + ret = 1; +out: + put_task_struct(task); +out_no_task: + return ret; +} #ifdef CONFIG_SECURITY static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { - struct inode * inode = file->f_dentry->d_inode; + struct inode * inode = file->f_path.dentry->d_inode; unsigned long page; ssize_t length; struct task_struct *task = get_proc_task(inode); @@ -1581,8 +1572,8 @@ static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, if (!(page = __get_free_page(GFP_KERNEL))) goto out; - length = security_getprocattr(task, - (char*)file->f_dentry->d_name.name, + length = security_getprocattr(task, + (char*)file->f_path.dentry->d_name.name, (void*)page, count); if (length >= 0) length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); @@ -1595,17 +1586,17 @@ out_no_task: static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos) -{ - struct inode * inode = file->f_dentry->d_inode; - char *page; - ssize_t length; +{ + struct inode * inode = file->f_path.dentry->d_inode; + char *page; + ssize_t length; struct task_struct *task = get_proc_task(inode); length = -ESRCH; if (!task) goto out_no_task; - if (count > PAGE_SIZE) - count = PAGE_SIZE; + if (count > PAGE_SIZE) + count = PAGE_SIZE; /* No partial writes. */ length = -EINVAL; @@ -1613,16 +1604,16 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, goto out; length = -ENOMEM; - page = (char*)__get_free_page(GFP_USER); - if (!page) + page = (char*)__get_free_page(GFP_USER); + if (!page) goto out; - length = -EFAULT; - if (copy_from_user(page, buf, count)) + length = -EFAULT; + if (copy_from_user(page, buf, count)) goto out_free; - length = security_setprocattr(task, - (char*)file->f_dentry->d_name.name, + length = security_setprocattr(task, + (char*)file->f_path.dentry->d_name.name, (void*)page, count); out_free: free_page((unsigned long) page); @@ -1630,329 +1621,293 @@ out: put_task_struct(task); out_no_task: return length; -} +} -static struct file_operations proc_pid_attr_operations = { +static const struct file_operations proc_pid_attr_operations = { .read = proc_pid_attr_read, .write = proc_pid_attr_write, }; -static struct file_operations proc_tid_attr_operations; -static struct inode_operations proc_tid_attr_inode_operations; -static struct file_operations proc_tgid_attr_operations; -static struct inode_operations proc_tgid_attr_inode_operations; -#endif +static struct pid_entry attr_dir_stuff[] = { + REG("current", S_IRUGO|S_IWUGO, pid_attr), + REG("prev", S_IRUGO, pid_attr), + REG("exec", S_IRUGO|S_IWUGO, pid_attr), + REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), + REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), + REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), +}; -/* SMP-safe */ -static struct dentry *proc_pident_lookup(struct inode *dir, - struct dentry *dentry, - struct pid_entry *ents) +static int proc_attr_dir_readdir(struct file * filp, + void * dirent, filldir_t filldir) { - struct inode *inode; - struct dentry *error; - struct task_struct *task = get_proc_task(dir); - struct pid_entry *p; - struct proc_inode *ei; - - error = ERR_PTR(-ENOENT); - inode = NULL; + return proc_pident_readdir(filp,dirent,filldir, + attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); +} - if (!task) - goto out_no_task; +static const struct file_operations proc_attr_dir_operations = { + .read = generic_read_dir, + .readdir = proc_attr_dir_readdir, +}; - for (p = ents; p->name; p++) { - if (p->len != dentry->d_name.len) - continue; - if (!memcmp(dentry->d_name.name, p->name, p->len)) - break; - } - if (!p->name) - goto out; +static struct dentry *proc_attr_dir_lookup(struct inode *dir, + struct dentry *dentry, struct nameidata *nd) +{ + return proc_pident_lookup(dir, dentry, + attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); +} - error = ERR_PTR(-EINVAL); - inode = proc_pid_make_inode(dir->i_sb, task, p->type); - if (!inode) - goto out; +static struct inode_operations proc_attr_dir_inode_operations = { + .lookup = proc_attr_dir_lookup, + .getattr = pid_getattr, + .setattr = proc_setattr, +}; - ei = PROC_I(inode); - inode->i_mode = p->mode; - /* - * Yes, it does not scale. And it should not. Don't add - * new entries into /proc// without very good reasons. - */ - switch(p->type) { - case PROC_TGID_TASK: - inode->i_nlink = 2; - inode->i_op = &proc_task_inode_operations; - inode->i_fop = &proc_task_operations; - break; - case PROC_TID_FD: - case PROC_TGID_FD: - inode->i_nlink = 2; - inode->i_op = &proc_fd_inode_operations; - inode->i_fop = &proc_fd_operations; - break; - case PROC_TID_EXE: - case PROC_TGID_EXE: - inode->i_op = &proc_pid_link_inode_operations; - ei->op.proc_get_link = proc_exe_link; - break; - case PROC_TID_CWD: - case PROC_TGID_CWD: - inode->i_op = &proc_pid_link_inode_operations; - ei->op.proc_get_link = proc_cwd_link; - break; - case PROC_TID_ROOT: - case PROC_TGID_ROOT: - inode->i_op = &proc_pid_link_inode_operations; - ei->op.proc_get_link = proc_root_link; - break; - case PROC_TID_ENVIRON: - case PROC_TGID_ENVIRON: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_pid_environ; - break; - case PROC_TID_AUXV: - case PROC_TGID_AUXV: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_pid_auxv; - break; - case PROC_TID_STATUS: - case PROC_TGID_STATUS: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_pid_status; - break; - case PROC_TID_STAT: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_tid_stat; - break; - case PROC_TGID_STAT: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_tgid_stat; - break; - case PROC_TID_CMDLINE: - case PROC_TGID_CMDLINE: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_pid_cmdline; - break; - case PROC_TID_STATM: - case PROC_TGID_STATM: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_pid_statm; - break; - case PROC_TID_MAPS: - case PROC_TGID_MAPS: - inode->i_fop = &proc_maps_operations; - break; -#ifdef CONFIG_NUMA - case PROC_TID_NUMA_MAPS: - case PROC_TGID_NUMA_MAPS: - inode->i_fop = &proc_numa_maps_operations; - break; -#endif - case PROC_TID_MEM: - case PROC_TGID_MEM: - inode->i_fop = &proc_mem_operations; - break; -#ifdef CONFIG_SECCOMP - case PROC_TID_SECCOMP: - case PROC_TGID_SECCOMP: - inode->i_fop = &proc_seccomp_operations; - break; -#endif /* CONFIG_SECCOMP */ - case PROC_TID_MOUNTS: - case PROC_TGID_MOUNTS: - inode->i_fop = &proc_mounts_operations; - break; -#ifdef CONFIG_MMU - case PROC_TID_SMAPS: - case PROC_TGID_SMAPS: - inode->i_fop = &proc_smaps_operations; - break; -#endif - case PROC_TID_MOUNTSTATS: - case PROC_TGID_MOUNTSTATS: - inode->i_fop = &proc_mountstats_operations; - break; -#ifdef CONFIG_SECURITY - case PROC_TID_ATTR: - inode->i_nlink = 2; - inode->i_op = &proc_tid_attr_inode_operations; - inode->i_fop = &proc_tid_attr_operations; - break; - case PROC_TGID_ATTR: - inode->i_nlink = 2; - inode->i_op = &proc_tgid_attr_inode_operations; - inode->i_fop = &proc_tgid_attr_operations; - break; - case PROC_TID_ATTR_CURRENT: - case PROC_TGID_ATTR_CURRENT: - case PROC_TID_ATTR_PREV: - case PROC_TGID_ATTR_PREV: - case PROC_TID_ATTR_EXEC: - case PROC_TGID_ATTR_EXEC: - case PROC_TID_ATTR_FSCREATE: - case PROC_TGID_ATTR_FSCREATE: - case PROC_TID_ATTR_KEYCREATE: - case PROC_TGID_ATTR_KEYCREATE: - case PROC_TID_ATTR_SOCKCREATE: - case PROC_TGID_ATTR_SOCKCREATE: - inode->i_fop = &proc_pid_attr_operations; - break; #endif -#ifdef CONFIG_KALLSYMS - case PROC_TID_WCHAN: - case PROC_TGID_WCHAN: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_pid_wchan; - break; -#endif -#ifdef CONFIG_SCHEDSTATS - case PROC_TID_SCHEDSTAT: - case PROC_TGID_SCHEDSTAT: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_pid_schedstat; - break; -#endif -#ifdef CONFIG_CPUSETS - case PROC_TID_CPUSET: - case PROC_TGID_CPUSET: - inode->i_fop = &proc_cpuset_operations; - break; -#endif - case PROC_TID_OOM_SCORE: - case PROC_TGID_OOM_SCORE: - inode->i_fop = &proc_info_file_operations; - ei->op.proc_read = proc_oom_score; - break; - case PROC_TID_OOM_ADJUST: - case PROC_TGID_OOM_ADJUST: - inode->i_fop = &proc_oom_adjust_operations; - break; -#ifdef CONFIG_AUDITSYSCALL - case PROC_TID_LOGINUID: - case PROC_TGID_LOGINUID: - inode->i_fop = &proc_loginuid_operations; - break; -#endif - default: - printk("procfs: impossible type (%d)",p->type); - iput(inode); - error = ERR_PTR(-EINVAL); - goto out; - } - dentry->d_op = &pid_dentry_operations; - d_add(dentry, inode); - /* Close the race of the process dying before we return the dentry */ - if (pid_revalidate(dentry, NULL)) - error = NULL; -out: - put_task_struct(task); -out_no_task: - return error; -} -static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ - return proc_pident_lookup(dir, dentry, tgid_base_stuff); +/* + * /proc/self: + */ +static int proc_self_readlink(struct dentry *dentry, char __user *buffer, + int buflen) +{ + char tmp[PROC_NUMBUF]; + sprintf(tmp, "%d", current->tgid); + return vfs_readlink(dentry,buffer,buflen,tmp); } -static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ - return proc_pident_lookup(dir, dentry, tid_base_stuff); +static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + char tmp[PROC_NUMBUF]; + sprintf(tmp, "%d", current->tgid); + return ERR_PTR(vfs_follow_link(nd,tmp)); } -static struct file_operations proc_tgid_base_operations = { - .read = generic_read_dir, - .readdir = proc_tgid_base_readdir, +static struct inode_operations proc_self_inode_operations = { + .readlink = proc_self_readlink, + .follow_link = proc_self_follow_link, }; -static struct file_operations proc_tid_base_operations = { - .read = generic_read_dir, - .readdir = proc_tid_base_readdir, +/* + * proc base + * + * These are the directory entries in the root directory of /proc + * that properly belong to the /proc filesystem, as they describe + * describe something that is process related. + */ +static struct pid_entry proc_base_stuff[] = { + NOD("self", S_IFLNK|S_IRWXUGO, + &proc_self_inode_operations, NULL, {}), }; -static struct inode_operations proc_tgid_base_inode_operations = { - .lookup = proc_tgid_base_lookup, - .getattr = pid_getattr, - .setattr = proc_setattr, -}; +/* + * Exceptional case: normally we are not allowed to unhash a busy + * directory. In this case, however, we can do it - no aliasing problems + * due to the way we treat inodes. + */ +static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) +{ + struct inode *inode = dentry->d_inode; + struct task_struct *task = get_proc_task(inode); + if (task) { + put_task_struct(task); + return 1; + } + d_drop(dentry); + return 0; +} -static struct inode_operations proc_tid_base_inode_operations = { - .lookup = proc_tid_base_lookup, - .getattr = pid_getattr, - .setattr = proc_setattr, +static struct dentry_operations proc_base_dentry_operations = +{ + .d_revalidate = proc_base_revalidate, + .d_delete = pid_delete_dentry, }; -#ifdef CONFIG_SECURITY -static int proc_tgid_attr_readdir(struct file * filp, - void * dirent, filldir_t filldir) +static struct dentry *proc_base_instantiate(struct inode *dir, + struct dentry *dentry, struct task_struct *task, void *ptr) { - return proc_pident_readdir(filp,dirent,filldir, - tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff)); + struct pid_entry *p = ptr; + struct inode *inode; + struct proc_inode *ei; + struct dentry *error = ERR_PTR(-EINVAL); + + /* Allocate the inode */ + error = ERR_PTR(-ENOMEM); + inode = new_inode(dir->i_sb); + if (!inode) + goto out; + + /* Initialize the inode */ + ei = PROC_I(inode); + inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; + + /* + * grab the reference to the task. + */ + ei->pid = get_task_pid(task, PIDTYPE_PID); + if (!ei->pid) + goto out_iput; + + inode->i_uid = 0; + inode->i_gid = 0; + inode->i_mode = p->mode; + if (S_ISDIR(inode->i_mode)) + inode->i_nlink = 2; + if (S_ISLNK(inode->i_mode)) + inode->i_size = 64; + if (p->iop) + inode->i_op = p->iop; + if (p->fop) + inode->i_fop = p->fop; + ei->op = p->op; + dentry->d_op = &proc_base_dentry_operations; + d_add(dentry, inode); + error = NULL; +out: + return error; +out_iput: + iput(inode); + goto out; } -static int proc_tid_attr_readdir(struct file * filp, - void * dirent, filldir_t filldir) +static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) { - return proc_pident_readdir(filp,dirent,filldir, - tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff)); -} + struct dentry *error; + struct task_struct *task = get_proc_task(dir); + struct pid_entry *p, *last; -static struct file_operations proc_tgid_attr_operations = { - .read = generic_read_dir, - .readdir = proc_tgid_attr_readdir, -}; + error = ERR_PTR(-ENOENT); -static struct file_operations proc_tid_attr_operations = { - .read = generic_read_dir, - .readdir = proc_tid_attr_readdir, -}; + if (!task) + goto out_no_task; + + /* Lookup the directory entry */ + last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; + for (p = proc_base_stuff; p <= last; p++) { + if (p->len != dentry->d_name.len) + continue; + if (!memcmp(dentry->d_name.name, p->name, p->len)) + break; + } + if (p > last) + goto out; + + error = proc_base_instantiate(dir, dentry, task, p); + +out: + put_task_struct(task); +out_no_task: + return error; +} -static struct dentry *proc_tgid_attr_lookup(struct inode *dir, - struct dentry *dentry, struct nameidata *nd) +static int proc_base_fill_cache(struct file *filp, void *dirent, filldir_t filldir, + struct task_struct *task, struct pid_entry *p) { - return proc_pident_lookup(dir, dentry, tgid_attr_stuff); + return proc_fill_cache(filp, dirent, filldir, p->name, p->len, + proc_base_instantiate, task, p); } -static struct dentry *proc_tid_attr_lookup(struct inode *dir, - struct dentry *dentry, struct nameidata *nd) +#ifdef CONFIG_TASK_IO_ACCOUNTING +static int proc_pid_io_accounting(struct task_struct *task, char *buffer) { - return proc_pident_lookup(dir, dentry, tid_attr_stuff); + return sprintf(buffer, +#ifdef CONFIG_TASK_XACCT + "rchar: %llu\n" + "wchar: %llu\n" + "syscr: %llu\n" + "syscw: %llu\n" +#endif + "read_bytes: %llu\n" + "write_bytes: %llu\n" + "cancelled_write_bytes: %llu\n", +#ifdef CONFIG_TASK_XACCT + (unsigned long long)task->rchar, + (unsigned long long)task->wchar, + (unsigned long long)task->syscr, + (unsigned long long)task->syscw, +#endif + (unsigned long long)task->ioac.read_bytes, + (unsigned long long)task->ioac.write_bytes, + (unsigned long long)task->ioac.cancelled_write_bytes); } - -static struct inode_operations proc_tgid_attr_inode_operations = { - .lookup = proc_tgid_attr_lookup, - .getattr = pid_getattr, - .setattr = proc_setattr, -}; - -static struct inode_operations proc_tid_attr_inode_operations = { - .lookup = proc_tid_attr_lookup, - .getattr = pid_getattr, - .setattr = proc_setattr, -}; #endif /* - * /proc/self: + * Thread groups */ -static int proc_self_readlink(struct dentry *dentry, char __user *buffer, - int buflen) +static const struct file_operations proc_task_operations; +static struct inode_operations proc_task_inode_operations; + +static struct pid_entry tgid_base_stuff[] = { + DIR("task", S_IRUGO|S_IXUGO, task), + DIR("fd", S_IRUSR|S_IXUSR, fd), + INF("environ", S_IRUSR, pid_environ), + INF("auxv", S_IRUSR, pid_auxv), + INF("status", S_IRUGO, pid_status), + INF("cmdline", S_IRUGO, pid_cmdline), + INF("stat", S_IRUGO, tgid_stat), + INF("statm", S_IRUGO, pid_statm), + REG("maps", S_IRUGO, maps), +#ifdef CONFIG_NUMA + REG("numa_maps", S_IRUGO, numa_maps), +#endif + REG("mem", S_IRUSR|S_IWUSR, mem), +#ifdef CONFIG_SECCOMP + REG("seccomp", S_IRUSR|S_IWUSR, seccomp), +#endif + LNK("cwd", cwd), + LNK("root", root), + LNK("exe", exe), + REG("mounts", S_IRUGO, mounts), + REG("mountstats", S_IRUSR, mountstats), +#ifdef CONFIG_MMU + REG("smaps", S_IRUGO, smaps), +#endif +#ifdef CONFIG_SECURITY + DIR("attr", S_IRUGO|S_IXUGO, attr_dir), +#endif +#ifdef CONFIG_KALLSYMS + INF("wchan", S_IRUGO, pid_wchan), +#endif +#ifdef CONFIG_SCHEDSTATS + INF("schedstat", S_IRUGO, pid_schedstat), +#endif +#ifdef CONFIG_CPUSETS + REG("cpuset", S_IRUGO, cpuset), +#endif + INF("oom_score", S_IRUGO, oom_score), + REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), +#ifdef CONFIG_AUDITSYSCALL + REG("loginuid", S_IWUSR|S_IRUGO, loginuid), +#endif +#ifdef CONFIG_FAULT_INJECTION + REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), +#endif +#ifdef CONFIG_TASK_IO_ACCOUNTING + INF("io", S_IRUGO, pid_io_accounting), +#endif +}; + +static int proc_tgid_base_readdir(struct file * filp, + void * dirent, filldir_t filldir) { - char tmp[PROC_NUMBUF]; - sprintf(tmp, "%d", current->tgid); - return vfs_readlink(dentry,buffer,buflen,tmp); + return proc_pident_readdir(filp,dirent,filldir, + tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); } -static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) -{ - char tmp[PROC_NUMBUF]; - sprintf(tmp, "%d", current->tgid); - return ERR_PTR(vfs_follow_link(nd,tmp)); -} +static const struct file_operations proc_tgid_base_operations = { + .read = generic_read_dir, + .readdir = proc_tgid_base_readdir, +}; -static struct inode_operations proc_self_inode_operations = { - .readlink = proc_self_readlink, - .follow_link = proc_self_follow_link, +static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ + return proc_pident_lookup(dir, dentry, + tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); +} + +static struct inode_operations proc_tgid_base_inode_operations = { + .lookup = proc_tgid_base_lookup, + .getattr = pid_getattr, + .setattr = proc_setattr, }; /** @@ -2022,54 +1977,24 @@ out: return; } -/* SMP-safe */ -struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) +static struct dentry *proc_pid_instantiate(struct inode *dir, + struct dentry * dentry, + struct task_struct *task, void *ptr) { - struct dentry *result = ERR_PTR(-ENOENT); - struct task_struct *task; + struct dentry *error = ERR_PTR(-ENOENT); struct inode *inode; - struct proc_inode *ei; - unsigned tgid; - - if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) { - inode = new_inode(dir->i_sb); - if (!inode) - return ERR_PTR(-ENOMEM); - ei = PROC_I(inode); - inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; - inode->i_ino = fake_ino(0, PROC_TGID_INO); - ei->pde = NULL; - inode->i_mode = S_IFLNK|S_IRWXUGO; - inode->i_uid = inode->i_gid = 0; - inode->i_size = 64; - inode->i_op = &proc_self_inode_operations; - d_add(dentry, inode); - return NULL; - } - tgid = name_to_int(dentry); - if (tgid == ~0U) - goto out; - - rcu_read_lock(); - task = find_task_by_pid(tgid); - if (task) - get_task_struct(task); - rcu_read_unlock(); - if (!task) - goto out; - inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO); + inode = proc_pid_make_inode(dir->i_sb, task); if (!inode) - goto out_put_task; + goto out; inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; inode->i_op = &proc_tgid_base_inode_operations; inode->i_fop = &proc_tgid_base_operations; inode->i_flags|=S_IMMUTABLE; -#ifdef CONFIG_SECURITY - inode->i_nlink = 5; -#else inode->i_nlink = 4; +#ifdef CONFIG_SECURITY + inode->i_nlink += 1; #endif dentry->d_op = &pid_dentry_operations; @@ -2077,67 +2002,36 @@ struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct d_add(dentry, inode); /* Close the race of the process dying before we return the dentry */ if (pid_revalidate(dentry, NULL)) - result = NULL; - -out_put_task: - put_task_struct(task); + error = NULL; out: - return result; + return error; } -/* SMP-safe */ -static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) +struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) { struct dentry *result = ERR_PTR(-ENOENT); struct task_struct *task; - struct task_struct *leader = get_proc_task(dir); - struct inode *inode; - unsigned tid; + unsigned tgid; - if (!leader) - goto out_no_task; + result = proc_base_lookup(dir, dentry); + if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) + goto out; - tid = name_to_int(dentry); - if (tid == ~0U) + tgid = name_to_int(dentry); + if (tgid == ~0U) goto out; rcu_read_lock(); - task = find_task_by_pid(tid); + task = find_task_by_pid(tgid); if (task) get_task_struct(task); rcu_read_unlock(); if (!task) goto out; - if (leader->tgid != task->tgid) - goto out_drop_task; - - inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO); - - - if (!inode) - goto out_drop_task; - inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; - inode->i_op = &proc_tid_base_inode_operations; - inode->i_fop = &proc_tid_base_operations; - inode->i_flags|=S_IMMUTABLE; -#ifdef CONFIG_SECURITY - inode->i_nlink = 4; -#else - inode->i_nlink = 3; -#endif - - dentry->d_op = &pid_dentry_operations; - - d_add(dentry, inode); - /* Close the race of the process dying before we return the dentry */ - if (pid_revalidate(dentry, NULL)) - result = NULL; -out_drop_task: + result = proc_pid_instantiate(dir, dentry, task, NULL); put_task_struct(task); out: - put_task_struct(leader); -out_no_task: return result; } @@ -2177,45 +2071,185 @@ retry: return task; } -#define TGID_OFFSET (FIRST_PROCESS_ENTRY + (1 /* /proc/self */)) +#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) + +static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, + struct task_struct *task, int tgid) +{ + char name[PROC_NUMBUF]; + int len = snprintf(name, sizeof(name), "%d", tgid); + return proc_fill_cache(filp, dirent, filldir, name, len, + proc_pid_instantiate, task, NULL); +} /* for the /proc/ directory itself, after non-process stuff has been done */ int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) { - char buf[PROC_NUMBUF]; unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; + struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); struct task_struct *task; int tgid; - if (!nr) { - ino_t ino = fake_ino(0,PROC_TGID_INO); - if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0) - return 0; - filp->f_pos++; - nr++; + if (!reaper) + goto out_no_task; + + for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { + struct pid_entry *p = &proc_base_stuff[nr]; + if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) + goto out; } tgid = filp->f_pos - TGID_OFFSET; for (task = next_tgid(tgid); task; put_task_struct(task), task = next_tgid(tgid + 1)) { - int len; - ino_t ino; tgid = task->pid; filp->f_pos = tgid + TGID_OFFSET; - len = snprintf(buf, sizeof(buf), "%d", tgid); - ino = fake_ino(tgid, PROC_TGID_INO); - if (filldir(dirent, buf, len, filp->f_pos, ino, DT_DIR) < 0) { + if (proc_pid_fill_cache(filp, dirent, filldir, task, tgid) < 0) { put_task_struct(task); goto out; } } filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; out: + put_task_struct(reaper); +out_no_task: return 0; } /* + * Tasks + */ +static struct pid_entry tid_base_stuff[] = { + DIR("fd", S_IRUSR|S_IXUSR, fd), + INF("environ", S_IRUSR, pid_environ), + INF("auxv", S_IRUSR, pid_auxv), + INF("status", S_IRUGO, pid_status), + INF("cmdline", S_IRUGO, pid_cmdline), + INF("stat", S_IRUGO, tid_stat), + INF("statm", S_IRUGO, pid_statm), + REG("maps", S_IRUGO, maps), +#ifdef CONFIG_NUMA + REG("numa_maps", S_IRUGO, numa_maps), +#endif + REG("mem", S_IRUSR|S_IWUSR, mem), +#ifdef CONFIG_SECCOMP + REG("seccomp", S_IRUSR|S_IWUSR, seccomp), +#endif + LNK("cwd", cwd), + LNK("root", root), + LNK("exe", exe), + REG("mounts", S_IRUGO, mounts), +#ifdef CONFIG_MMU + REG("smaps", S_IRUGO, smaps), +#endif +#ifdef CONFIG_SECURITY + DIR("attr", S_IRUGO|S_IXUGO, attr_dir), +#endif +#ifdef CONFIG_KALLSYMS + INF("wchan", S_IRUGO, pid_wchan), +#endif +#ifdef CONFIG_SCHEDSTATS + INF("schedstat", S_IRUGO, pid_schedstat), +#endif +#ifdef CONFIG_CPUSETS + REG("cpuset", S_IRUGO, cpuset), +#endif + INF("oom_score", S_IRUGO, oom_score), + REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), +#ifdef CONFIG_AUDITSYSCALL + REG("loginuid", S_IWUSR|S_IRUGO, loginuid), +#endif +#ifdef CONFIG_FAULT_INJECTION + REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), +#endif +}; + +static int proc_tid_base_readdir(struct file * filp, + void * dirent, filldir_t filldir) +{ + return proc_pident_readdir(filp,dirent,filldir, + tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); +} + +static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ + return proc_pident_lookup(dir, dentry, + tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); +} + +static const struct file_operations proc_tid_base_operations = { + .read = generic_read_dir, + .readdir = proc_tid_base_readdir, +}; + +static struct inode_operations proc_tid_base_inode_operations = { + .lookup = proc_tid_base_lookup, + .getattr = pid_getattr, + .setattr = proc_setattr, +}; + +static struct dentry *proc_task_instantiate(struct inode *dir, + struct dentry *dentry, struct task_struct *task, void *ptr) +{ + struct dentry *error = ERR_PTR(-ENOENT); + struct inode *inode; + inode = proc_pid_make_inode(dir->i_sb, task); + + if (!inode) + goto out; + inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; + inode->i_op = &proc_tid_base_inode_operations; + inode->i_fop = &proc_tid_base_operations; + inode->i_flags|=S_IMMUTABLE; + inode->i_nlink = 3; +#ifdef CONFIG_SECURITY + inode->i_nlink += 1; +#endif + + dentry->d_op = &pid_dentry_operations; + + d_add(dentry, inode); + /* Close the race of the process dying before we return the dentry */ + if (pid_revalidate(dentry, NULL)) + error = NULL; +out: + return error; +} + +static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) +{ + struct dentry *result = ERR_PTR(-ENOENT); + struct task_struct *task; + struct task_struct *leader = get_proc_task(dir); + unsigned tid; + + if (!leader) + goto out_no_task; + + tid = name_to_int(dentry); + if (tid == ~0U) + goto out; + + rcu_read_lock(); + task = find_task_by_pid(tid); + if (task) + get_task_struct(task); + rcu_read_unlock(); + if (!task) + goto out; + if (leader->tgid != task->tgid) + goto out_drop_task; + + result = proc_task_instantiate(dir, dentry, task, NULL); +out_drop_task: + put_task_struct(task); +out: + put_task_struct(leader); +out_no_task: + return result; +} + +/* * Find the first tid of a thread group to return to user space. * * Usually this is just the thread group leader, but if the users @@ -2284,19 +2318,37 @@ static struct task_struct *next_tid(struct task_struct *start) return pos; } +static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, + struct task_struct *task, int tid) +{ + char name[PROC_NUMBUF]; + int len = snprintf(name, sizeof(name), "%d", tid); + return proc_fill_cache(filp, dirent, filldir, name, len, + proc_task_instantiate, task, NULL); +} + /* for the /proc/TGID/task/ directories */ static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) { - char buf[PROC_NUMBUF]; - struct dentry *dentry = filp->f_dentry; + struct dentry *dentry = filp->f_path.dentry; struct inode *inode = dentry->d_inode; - struct task_struct *leader = get_proc_task(inode); + struct task_struct *leader = NULL; struct task_struct *task; int retval = -ENOENT; ino_t ino; int tid; unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ + task = get_proc_task(inode); + if (!task) + goto out_no_task; + rcu_read_lock(); + if (pid_alive(task)) { + leader = task->group_leader; + get_task_struct(leader); + } + rcu_read_unlock(); + put_task_struct(task); if (!leader) goto out_no_task; retval = 0; @@ -2324,11 +2376,8 @@ static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldi for (task = first_tid(leader, tid, pos - 2); task; task = next_tid(task), pos++) { - int len; tid = task->pid; - len = snprintf(buf, sizeof(buf), "%d", tid); - ino = fake_ino(tid, PROC_TID_INO); - if (filldir(dirent, buf, len, pos, ino, DT_DIR < 0)) { + if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { /* returning this tgid failed, save it as the first * pid for the next readir call */ filp->f_version = tid; @@ -2358,3 +2407,14 @@ static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct return 0; } + +static struct inode_operations proc_task_inode_operations = { + .lookup = proc_task_lookup, + .getattr = proc_task_getattr, + .setattr = proc_setattr, +}; + +static const struct file_operations proc_task_operations = { + .read = generic_read_dir, + .readdir = proc_task_readdir, +};