extern struct list_head audit_filter_list[];
-/* No syscall auditing will take place unless audit_enabled != 0. */
-extern int audit_enabled;
-
/* AUDIT_NAMES is the number of slots we reserve in the audit_context
* for saving names from getname(). */
#define AUDIT_NAMES 20
-/* AUDIT_NAMES_RESERVED is the number of slots we reserve in the
- * audit_context from being used for nameless inodes from
- * path_lookup. */
-#define AUDIT_NAMES_RESERVED 7
-
/* Indicates that audit should log the full pathname. */
#define AUDIT_NAME_FULL -1
/* number of audit rules */
int audit_n_rules;
+/* determines whether we collect data for signals sent */
+int audit_signals;
+
/* When fs/namei.c:getname() is called, we store the pointer in name and
* we don't let putname() free it (instead we free all of the saved
* pointers at syscall exit time).
#define AUDIT_AUX_IPCPERM 0
+/* Number of target pids per aux struct. */
+#define AUDIT_AUX_PIDS 16
+
struct audit_aux_data_mq_open {
struct audit_aux_data d;
int oflag;
struct vfsmount *mnt;
};
+struct audit_aux_data_pids {
+ struct audit_aux_data d;
+ pid_t target_pid[AUDIT_AUX_PIDS];
+ u32 target_sid[AUDIT_AUX_PIDS];
+ int pid_count;
+};
+
/* The per-task audit context. */
struct audit_context {
int dummy; /* must be the first element */
struct vfsmount * pwdmnt;
struct audit_context *previous; /* For nested syscalls */
struct audit_aux_data *aux;
+ struct audit_aux_data *aux_pids;
/* Save things to print about task_struct */
pid_t pid, ppid;
unsigned long personality;
int arch;
+ pid_t target_pid;
+ u32 target_sid;
+
#if AUDIT_DEBUG
int put_count;
int ino_count;
context->aux = aux->next;
kfree(aux);
}
+ while ((aux = context->aux_pids)) {
+ context->aux_pids = aux->next;
+ kfree(aux);
+ }
}
static inline void audit_zero_context(struct audit_context *context,
audit_log_task_context(ab);
}
+static int audit_log_pid_context(struct audit_context *context, pid_t pid,
+ u32 sid)
+{
+ struct audit_buffer *ab;
+ char *s = NULL;
+ u32 len;
+ int rc = 0;
+
+ ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
+ if (!ab)
+ return 1;
+
+ if (selinux_sid_to_string(sid, &s, &len)) {
+ audit_log_format(ab, "opid=%d obj=(none)", pid);
+ rc = 1;
+ } else
+ audit_log_format(ab, "opid=%d obj=%s", pid, s);
+ audit_log_end(ab);
+ kfree(s);
+
+ return rc;
+}
+
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
int i, call_panic = 0;
audit_log_end(ab);
}
+ for (aux = context->aux_pids; aux; aux = aux->next) {
+ struct audit_aux_data_pids *axs = (void *)aux;
+ int i;
+
+ for (i = 0; i < axs->pid_count; i++)
+ if (audit_log_pid_context(context, axs->target_pid[i],
+ axs->target_sid[i]))
+ call_panic = 1;
+ }
+
+ if (context->target_pid &&
+ audit_log_pid_context(context, context->target_pid,
+ context->target_sid))
+ call_panic = 1;
+
if (context->pwd && context->pwdmnt) {
ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
if (ab) {
} else {
audit_free_names(context);
audit_free_aux(context);
+ context->aux = NULL;
+ context->aux_pids = NULL;
+ context->target_pid = 0;
+ context->target_sid = 0;
kfree(context->filterkey);
context->filterkey = NULL;
tsk->audit_context = context;
context->names[context->name_count].name_len = AUDIT_NAME_FULL;
context->names[context->name_count].name_put = 1;
context->names[context->name_count].ino = (unsigned long)-1;
+ context->names[context->name_count].osid = 0;
++context->name_count;
if (!context->pwd) {
read_lock(¤t->fs->lock);
#endif
}
+static int audit_inc_name_count(struct audit_context *context,
+ const struct inode *inode)
+{
+ if (context->name_count >= AUDIT_NAMES) {
+ if (inode)
+ printk(KERN_DEBUG "name_count maxed, losing inode data: "
+ "dev=%02x:%02x, inode=%lu",
+ MAJOR(inode->i_sb->s_dev),
+ MINOR(inode->i_sb->s_dev),
+ inode->i_ino);
+
+ else
+ printk(KERN_DEBUG "name_count maxed, losing inode data");
+ return 1;
+ }
+ context->name_count++;
+#if AUDIT_DEBUG
+ context->ino_count++;
+#endif
+ return 0;
+}
+
/* Copy inode data into an audit_names. */
static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
{
else {
/* FIXME: how much do we care about inodes that have no
* associated name? */
- if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED)
+ if (audit_inc_name_count(context, inode))
return;
- idx = context->name_count++;
+ idx = context->name_count - 1;
context->names[idx].name = NULL;
-#if AUDIT_DEBUG
- ++context->ino_count;
-#endif
}
audit_copy_inode(&context->names[idx], inode);
}
{
int idx;
struct audit_context *context = current->audit_context;
- const char *found_name = NULL;
+ const char *found_parent = NULL, *found_child = NULL;
int dirlen = 0;
if (!context->in_syscall)
/* determine matching parent */
if (!dname)
- goto update_context;
- for (idx = 0; idx < context->name_count; idx++)
- if (context->names[idx].ino == parent->i_ino) {
- const char *name = context->names[idx].name;
+ goto add_names;
- if (!name)
- continue;
+ /* parent is more likely, look for it first */
+ for (idx = 0; idx < context->name_count; idx++) {
+ struct audit_names *n = &context->names[idx];
- if (audit_compare_dname_path(dname, name, &dirlen) == 0) {
- context->names[idx].name_len = dirlen;
- found_name = name;
- break;
- }
+ if (!n->name)
+ continue;
+
+ if (n->ino == parent->i_ino &&
+ !audit_compare_dname_path(dname, n->name, &dirlen)) {
+ n->name_len = dirlen; /* update parent data in place */
+ found_parent = n->name;
+ goto add_names;
}
+ }
-update_context:
- idx = context->name_count;
- if (context->name_count == AUDIT_NAMES) {
- printk(KERN_DEBUG "name_count maxed and losing %s\n",
- found_name ?: "(null)");
- return;
+ /* no matching parent, look for matching child */
+ for (idx = 0; idx < context->name_count; idx++) {
+ struct audit_names *n = &context->names[idx];
+
+ if (!n->name)
+ continue;
+
+ /* strcmp() is the more likely scenario */
+ if (!strcmp(dname, n->name) ||
+ !audit_compare_dname_path(dname, n->name, &dirlen)) {
+ if (inode)
+ audit_copy_inode(n, inode);
+ else
+ n->ino = (unsigned long)-1;
+ found_child = n->name;
+ goto add_names;
+ }
}
- context->name_count++;
-#if AUDIT_DEBUG
- context->ino_count++;
-#endif
- /* Re-use the name belonging to the slot for a matching parent directory.
- * All names for this context are relinquished in audit_free_names() */
- context->names[idx].name = found_name;
- context->names[idx].name_len = AUDIT_NAME_FULL;
- context->names[idx].name_put = 0; /* don't call __putname() */
-
- if (!inode)
- context->names[idx].ino = (unsigned long)-1;
- else
- audit_copy_inode(&context->names[idx], inode);
-
- /* A parent was not found in audit_names, so copy the inode data for the
- * provided parent. */
- if (!found_name) {
- idx = context->name_count;
- if (context->name_count == AUDIT_NAMES) {
- printk(KERN_DEBUG
- "name_count maxed and losing parent inode data: dev=%02x:%02x, inode=%lu",
- MAJOR(parent->i_sb->s_dev),
- MINOR(parent->i_sb->s_dev),
- parent->i_ino);
+
+add_names:
+ if (!found_parent) {
+ if (audit_inc_name_count(context, parent))
return;
- }
- context->name_count++;
-#if AUDIT_DEBUG
- context->ino_count++;
-#endif
+ idx = context->name_count - 1;
+ context->names[idx].name = NULL;
audit_copy_inode(&context->names[idx], parent);
}
-}
-/**
- * audit_inode_update - update inode info for last collected name
- * @inode: inode being audited
- *
- * When open() is called on an existing object with the O_CREAT flag, the inode
- * data audit initially collects is incorrect. This additional hook ensures
- * audit has the inode data for the actual object to be opened.
- */
-void __audit_inode_update(const struct inode *inode)
-{
- struct audit_context *context = current->audit_context;
- int idx;
+ if (!found_child) {
+ if (audit_inc_name_count(context, inode))
+ return;
+ idx = context->name_count - 1;
- if (!context->in_syscall || !inode)
- return;
+ /* Re-use the name belonging to the slot for a matching parent
+ * directory. All names for this context are relinquished in
+ * audit_free_names() */
+ if (found_parent) {
+ context->names[idx].name = found_parent;
+ context->names[idx].name_len = AUDIT_NAME_FULL;
+ /* don't call __putname() */
+ context->names[idx].name_put = 0;
+ } else {
+ context->names[idx].name = NULL;
+ }
- if (context->name_count == 0) {
- context->name_count++;
-#if AUDIT_DEBUG
- context->ino_count++;
-#endif
+ if (inode)
+ audit_copy_inode(&context->names[idx], inode);
+ else
+ context->names[idx].ino = (unsigned long)-1;
}
- idx = context->name_count - 1;
-
- audit_copy_inode(&context->names[idx], inode);
}
/**
return 0;
}
+void __audit_ptrace(struct task_struct *t)
+{
+ struct audit_context *context = current->audit_context;
+
+ context->target_pid = t->pid;
+ selinux_get_task_sid(t, &context->target_sid);
+}
+
/**
* audit_avc_path - record the granting or denial of permissions
* @dentry: dentry to record
* If the audit subsystem is being terminated, record the task (pid)
* and uid that is doing that.
*/
-void __audit_signal_info(int sig, struct task_struct *t)
+int __audit_signal_info(int sig, struct task_struct *t)
{
+ struct audit_aux_data_pids *axp;
+ struct task_struct *tsk = current;
+ struct audit_context *ctx = tsk->audit_context;
extern pid_t audit_sig_pid;
extern uid_t audit_sig_uid;
extern u32 audit_sig_sid;
- if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) {
- struct task_struct *tsk = current;
- struct audit_context *ctx = tsk->audit_context;
+ if (audit_pid && t->tgid == audit_pid &&
+ (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1)) {
audit_sig_pid = tsk->pid;
if (ctx)
audit_sig_uid = ctx->loginuid;
audit_sig_uid = tsk->uid;
selinux_get_task_sid(tsk, &audit_sig_sid);
}
+
+ if (!audit_signals) /* audit_context checked in wrapper */
+ return 0;
+
+ /* optimize the common case by putting first signal recipient directly
+ * in audit_context */
+ if (!ctx->target_pid) {
+ ctx->target_pid = t->tgid;
+ selinux_get_task_sid(t, &ctx->target_sid);
+ return 0;
+ }
+
+ axp = (void *)ctx->aux_pids;
+ if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
+ axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
+ if (!axp)
+ return -ENOMEM;
+
+ axp->d.type = AUDIT_OBJ_PID;
+ axp->d.next = ctx->aux_pids;
+ ctx->aux_pids = (void *)axp;
+ }
+ BUG_ON(axp->pid_count > AUDIT_AUX_PIDS);
+
+ axp->target_pid[axp->pid_count] = t->tgid;
+ selinux_get_task_sid(t, &axp->target_sid[axp->pid_count]);
+ axp->pid_count++;
+
+ return 0;
+}
+
+/**
+ * audit_core_dumps - record information about processes that end abnormally
+ * @signr: signal value
+ *
+ * If a process ends with a core dump, something fishy is going on and we
+ * should record the event for investigation.
+ */
+void audit_core_dumps(long signr)
+{
+ struct audit_buffer *ab;
+ u32 sid;
+
+ if (!audit_enabled)
+ return;
+
+ if (signr == SIGQUIT) /* don't care for those */
+ return;
+
+ ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+ audit_log_format(ab, "auid=%u uid=%u gid=%u",
+ audit_get_loginuid(current->audit_context),
+ current->uid, current->gid);
+ selinux_get_task_sid(current, &sid);
+ if (sid) {
+ char *ctx = NULL;
+ u32 len;
+
+ if (selinux_sid_to_string(sid, &ctx, &len))
+ audit_log_format(ab, " ssid=%u", sid);
+ else
+ audit_log_format(ab, " subj=%s", ctx);
+ kfree(ctx);
+ }
+ audit_log_format(ab, " pid=%d comm=", current->pid);
+ audit_log_untrustedstring(ab, current->comm);
+ audit_log_format(ab, " sig=%ld", signr);
+ audit_log_end(ab);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff