#include <linux/init.h>
#include <asm/types.h>
#include <asm/atomic.h>
-#include <asm/types.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/binfmts.h>
#include <linux/highmem.h>
#include <linux/syscalls.h>
+#include <linux/inotify.h>
#include "audit.h"
int pid_count;
};
+struct audit_tree_refs {
+ struct audit_tree_refs *next;
+ struct audit_chunk *c[31];
+};
+
/* The per-task audit context. */
struct audit_context {
int dummy; /* must be the first element */
enum audit_state state;
unsigned int serial; /* serial number for record */
struct timespec ctime; /* time of syscall entry */
- uid_t loginuid; /* login uid (identity) */
int major; /* syscall number */
unsigned long argv[4]; /* syscall arguments */
int return_valid; /* return code is valid */
pid_t target_pid;
u32 target_sid;
+ struct audit_tree_refs *trees, *first_trees;
+ int tree_count;
+
#if AUDIT_DEBUG
int put_count;
int ino_count;
}
}
+/*
+ * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
+ * ->first_trees points to its beginning, ->trees - to the current end of data.
+ * ->tree_count is the number of free entries in array pointed to by ->trees.
+ * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
+ * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
+ * it's going to remain 1-element for almost any setup) until we free context itself.
+ * References in it _are_ dropped - at the same time we free/drop aux stuff.
+ */
+
+#ifdef CONFIG_AUDIT_TREE
+static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
+{
+ struct audit_tree_refs *p = ctx->trees;
+ int left = ctx->tree_count;
+ if (likely(left)) {
+ p->c[--left] = chunk;
+ ctx->tree_count = left;
+ return 1;
+ }
+ if (!p)
+ return 0;
+ p = p->next;
+ if (p) {
+ p->c[30] = chunk;
+ ctx->trees = p;
+ ctx->tree_count = 30;
+ return 1;
+ }
+ return 0;
+}
+
+static int grow_tree_refs(struct audit_context *ctx)
+{
+ struct audit_tree_refs *p = ctx->trees;
+ ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
+ if (!ctx->trees) {
+ ctx->trees = p;
+ return 0;
+ }
+ if (p)
+ p->next = ctx->trees;
+ else
+ ctx->first_trees = ctx->trees;
+ ctx->tree_count = 31;
+ return 1;
+}
+#endif
+
+static void unroll_tree_refs(struct audit_context *ctx,
+ struct audit_tree_refs *p, int count)
+{
+#ifdef CONFIG_AUDIT_TREE
+ struct audit_tree_refs *q;
+ int n;
+ if (!p) {
+ /* we started with empty chain */
+ p = ctx->first_trees;
+ count = 31;
+ /* if the very first allocation has failed, nothing to do */
+ if (!p)
+ return;
+ }
+ n = count;
+ for (q = p; q != ctx->trees; q = q->next, n = 31) {
+ while (n--) {
+ audit_put_chunk(q->c[n]);
+ q->c[n] = NULL;
+ }
+ }
+ while (n-- > ctx->tree_count) {
+ audit_put_chunk(q->c[n]);
+ q->c[n] = NULL;
+ }
+ ctx->trees = p;
+ ctx->tree_count = count;
+#endif
+}
+
+static void free_tree_refs(struct audit_context *ctx)
+{
+ struct audit_tree_refs *p, *q;
+ for (p = ctx->first_trees; p; p = q) {
+ q = p->next;
+ kfree(p);
+ }
+}
+
+static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
+{
+#ifdef CONFIG_AUDIT_TREE
+ struct audit_tree_refs *p;
+ int n;
+ if (!tree)
+ return 0;
+ /* full ones */
+ for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
+ for (n = 0; n < 31; n++)
+ if (audit_tree_match(p->c[n], tree))
+ return 1;
+ }
+ /* partial */
+ if (p) {
+ for (n = ctx->tree_count; n < 31; n++)
+ if (audit_tree_match(p->c[n], tree))
+ return 1;
+ }
+#endif
+ return 0;
+}
+
/* Determine if any context name data matches a rule's watch data */
/* Compare a task_struct with an audit_rule. Return 1 on match, 0
* otherwise. */
result = audit_comparator(tsk->personality, f->op, f->val);
break;
case AUDIT_ARCH:
- if (ctx)
+ if (ctx)
result = audit_comparator(ctx->arch, f->op, f->val);
break;
result = (name->dev == rule->watch->dev &&
name->ino == rule->watch->ino);
break;
+ case AUDIT_DIR:
+ if (ctx)
+ result = match_tree_refs(ctx, rule->tree);
+ break;
case AUDIT_LOGINUID:
result = 0;
if (ctx)
- result = audit_comparator(ctx->loginuid, f->op, f->val);
+ result = audit_comparator(tsk->loginuid, f->op, f->val);
break;
case AUDIT_SUBJ_USER:
case AUDIT_SUBJ_ROLE:
if (likely(!context))
return NULL;
context->return_valid = return_valid;
- context->return_code = return_code;
+
+ /*
+ * we need to fix up the return code in the audit logs if the actual
+ * return codes are later going to be fixed up by the arch specific
+ * signal handlers
+ *
+ * This is actually a test for:
+ * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
+ * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
+ *
+ * but is faster than a bunch of ||
+ */
+ if (unlikely(return_code <= -ERESTARTSYS) &&
+ (return_code >= -ERESTART_RESTARTBLOCK) &&
+ (return_code != -ENOIOCTLCMD))
+ context->return_code = -EINTR;
+ else
+ context->return_code = return_code;
if (context->in_syscall && !context->dummy && !context->auditable) {
enum audit_state state;
static inline void audit_zero_context(struct audit_context *context,
enum audit_state state)
{
- uid_t loginuid = context->loginuid;
-
memset(context, 0, sizeof(*context));
context->state = state;
- context->loginuid = loginuid;
}
static inline struct audit_context *audit_alloc_context(enum audit_state state)
return -ENOMEM;
}
- /* Preserve login uid */
- context->loginuid = -1;
- if (current->audit_context)
- context->loginuid = current->audit_context->loginuid;
-
tsk->audit_context = context;
set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
return 0;
context->name_count, count);
}
audit_free_names(context);
+ unroll_tree_refs(context, NULL, 0);
+ free_tree_refs(context);
audit_free_aux(context);
kfree(context->filterkey);
kfree(context);
if (context->personality != PER_LINUX)
audit_log_format(ab, " per=%lx", context->personality);
if (context->return_valid)
- audit_log_format(ab, " success=%s exit=%ld",
+ audit_log_format(ab, " success=%s exit=%ld",
(context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
context->return_code);
context->name_count,
context->ppid,
context->pid,
- context->loginuid,
+ tsk->loginuid,
context->uid,
context->gid,
context->euid, context->suid, context->fsuid,
return;
/* Check for system calls that do not go through the exit
- * function (e.g., exit_group), then free context block.
- * We use GFP_ATOMIC here because we might be doing this
+ * function (e.g., exit_group), then free context block.
+ * We use GFP_ATOMIC here because we might be doing this
* in the context of the idle thread */
/* that can happen only if we are called from do_exit() */
if (context->in_syscall && context->auditable)
tsk->audit_context = new_context;
} else {
audit_free_names(context);
+ unroll_tree_refs(context, NULL, 0);
audit_free_aux(context);
context->aux = NULL;
context->aux_pids = NULL;
}
}
+static inline void handle_one(const struct inode *inode)
+{
+#ifdef CONFIG_AUDIT_TREE
+ struct audit_context *context;
+ struct audit_tree_refs *p;
+ struct audit_chunk *chunk;
+ int count;
+ if (likely(list_empty(&inode->inotify_watches)))
+ return;
+ context = current->audit_context;
+ p = context->trees;
+ count = context->tree_count;
+ rcu_read_lock();
+ chunk = audit_tree_lookup(inode);
+ rcu_read_unlock();
+ if (!chunk)
+ return;
+ if (likely(put_tree_ref(context, chunk)))
+ return;
+ if (unlikely(!grow_tree_refs(context))) {
+ printk(KERN_WARNING "out of memory, audit has lost a tree reference");
+ audit_set_auditable(context);
+ audit_put_chunk(chunk);
+ unroll_tree_refs(context, p, count);
+ return;
+ }
+ put_tree_ref(context, chunk);
+#endif
+}
+
+static void handle_path(const struct dentry *dentry)
+{
+#ifdef CONFIG_AUDIT_TREE
+ struct audit_context *context;
+ struct audit_tree_refs *p;
+ const struct dentry *d, *parent;
+ struct audit_chunk *drop;
+ unsigned long seq;
+ int count;
+
+ context = current->audit_context;
+ p = context->trees;
+ count = context->tree_count;
+retry:
+ drop = NULL;
+ d = dentry;
+ rcu_read_lock();
+ seq = read_seqbegin(&rename_lock);
+ for(;;) {
+ struct inode *inode = d->d_inode;
+ if (inode && unlikely(!list_empty(&inode->inotify_watches))) {
+ struct audit_chunk *chunk;
+ chunk = audit_tree_lookup(inode);
+ if (chunk) {
+ if (unlikely(!put_tree_ref(context, chunk))) {
+ drop = chunk;
+ break;
+ }
+ }
+ }
+ parent = d->d_parent;
+ if (parent == d)
+ break;
+ d = parent;
+ }
+ if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
+ rcu_read_unlock();
+ if (!drop) {
+ /* just a race with rename */
+ unroll_tree_refs(context, p, count);
+ goto retry;
+ }
+ audit_put_chunk(drop);
+ if (grow_tree_refs(context)) {
+ /* OK, got more space */
+ unroll_tree_refs(context, p, count);
+ goto retry;
+ }
+ /* too bad */
+ printk(KERN_WARNING
+ "out of memory, audit has lost a tree reference");
+ unroll_tree_refs(context, p, count);
+ audit_set_auditable(context);
+ return;
+ }
+ rcu_read_unlock();
+#endif
+}
+
/**
* audit_getname - add a name to the list
* @name: name to add
context->pwdmnt = mntget(current->fs->pwdmnt);
read_unlock(¤t->fs->lock);
}
-
+
}
/* audit_putname - intercept a putname request
/**
* audit_inode - store the inode and device from a lookup
* @name: name being audited
- * @inode: inode being audited
+ * @dentry: dentry being audited
*
* Called from fs/namei.c:path_lookup().
*/
-void __audit_inode(const char *name, const struct inode *inode)
+void __audit_inode(const char *name, const struct dentry *dentry)
{
int idx;
struct audit_context *context = current->audit_context;
+ const struct inode *inode = dentry->d_inode;
if (!context->in_syscall)
return;
idx = context->name_count - 1;
context->names[idx].name = NULL;
}
+ handle_path(dentry);
audit_copy_inode(&context->names[idx], inode);
}
/**
* audit_inode_child - collect inode info for created/removed objects
* @dname: inode's dentry name
- * @inode: inode being audited
+ * @dentry: dentry being audited
* @parent: inode of dentry parent
*
* For syscalls that create or remove filesystem objects, audit_inode
* must be hooked prior, in order to capture the target inode during
* unsuccessful attempts.
*/
-void __audit_inode_child(const char *dname, const struct inode *inode,
+void __audit_inode_child(const char *dname, const struct dentry *dentry,
const struct inode *parent)
{
int idx;
struct audit_context *context = current->audit_context;
const char *found_parent = NULL, *found_child = NULL;
+ const struct inode *inode = dentry->d_inode;
int dirlen = 0;
if (!context->in_syscall)
return;
+ if (inode)
+ handle_one(inode);
/* determine matching parent */
if (!dname)
goto add_names;
context->names[idx].ino = (unsigned long)-1;
}
}
+EXPORT_SYMBOL_GPL(__audit_inode_child);
/**
* auditsc_get_stamp - get local copies of audit_context values
{
struct audit_context *context = task->audit_context;
- if (context) {
- /* Only log if audit is enabled */
- if (context->in_syscall) {
- struct audit_buffer *ab;
-
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
- if (ab) {
- audit_log_format(ab, "login pid=%d uid=%u "
- "old auid=%u new auid=%u",
- task->pid, task->uid,
- context->loginuid, loginuid);
- audit_log_end(ab);
- }
+ if (context && context->in_syscall) {
+ struct audit_buffer *ab;
+
+ ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
+ if (ab) {
+ audit_log_format(ab, "login pid=%d uid=%u "
+ "old auid=%u new auid=%u",
+ task->pid, task->uid,
+ task->loginuid, loginuid);
+ audit_log_end(ab);
}
- context->loginuid = loginuid;
}
+ task->loginuid = loginuid;
return 0;
}
-/**
- * audit_get_loginuid - get the loginuid for an audit_context
- * @ctx: the audit_context
- *
- * Returns the context's loginuid or -1 if @ctx is NULL.
- */
-uid_t audit_get_loginuid(struct audit_context *ctx)
-{
- return ctx ? ctx->loginuid : -1;
-}
-
-EXPORT_SYMBOL(audit_get_loginuid);
-
/**
* __audit_mq_open - record audit data for a POSIX MQ open
* @oflag: open flag
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) {
audit_sig_pid = tsk->pid;
- if (ctx)
- audit_sig_uid = ctx->loginuid;
+ if (tsk->loginuid != -1)
+ audit_sig_uid = tsk->loginuid;
else
audit_sig_uid = tsk->uid;
selinux_get_task_sid(tsk, &audit_sig_sid);
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),
+ audit_get_loginuid(current),
current->uid, current->gid);
selinux_get_task_sid(current, &sid);
if (sid) {
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