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authorAl Viro <viro@zeniv.linux.org.uk>2012-10-20 15:07:18 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-11-28 21:53:36 -0500
commitc62d773a3751610010feb574d859f58de4a51eba (patch)
tree29fa0afb1dc90826cae0d356007a7ca057413eab /kernel
parent6b94631f9e8c45a46056cbc6a7a50ecebea4f8da (diff)
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audit: no nested contexts anymore...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/auditsc.c102
1 files changed, 21 insertions, 81 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 2f186ed80c40..c8ca7fafbcc9 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -200,7 +200,6 @@ struct audit_context {
struct list_head names_list; /* anchor for struct audit_names->list */
char * filterkey; /* key for rule that triggered record */
struct path pwd;
- struct audit_context *previous; /* For nested syscalls */
struct audit_aux_data *aux;
struct audit_aux_data *aux_pids;
struct sockaddr_storage *sockaddr;
@@ -1091,29 +1090,13 @@ int audit_alloc(struct task_struct *tsk)
static inline void audit_free_context(struct audit_context *context)
{
- struct audit_context *previous;
- int count = 0;
-
- do {
- previous = context->previous;
- if (previous || (count && count < 10)) {
- ++count;
- printk(KERN_ERR "audit(:%d): major=%d name_count=%d:"
- " freeing multiple contexts (%d)\n",
- context->serial, context->major,
- 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->sockaddr);
- kfree(context);
- context = previous;
- } while (context);
- if (count >= 10)
- printk(KERN_ERR "audit: freed %d contexts\n", count);
+ audit_free_names(context);
+ unroll_tree_refs(context, NULL, 0);
+ free_tree_refs(context);
+ audit_free_aux(context);
+ kfree(context->filterkey);
+ kfree(context->sockaddr);
+ kfree(context);
}
void audit_log_task_context(struct audit_buffer *ab)
@@ -1783,42 +1766,6 @@ void __audit_syscall_entry(int arch, int major,
if (!context)
return;
- /*
- * This happens only on certain architectures that make system
- * calls in kernel_thread via the entry.S interface, instead of
- * with direct calls. (If you are porting to a new
- * architecture, hitting this condition can indicate that you
- * got the _exit/_leave calls backward in entry.S.)
- *
- * i386 no
- * x86_64 no
- * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S)
- *
- * This also happens with vm86 emulation in a non-nested manner
- * (entries without exits), so this case must be caught.
- */
- if (context->in_syscall) {
- struct audit_context *newctx;
-
-#if AUDIT_DEBUG
- printk(KERN_ERR
- "audit(:%d) pid=%d in syscall=%d;"
- " entering syscall=%d\n",
- context->serial, tsk->pid, context->major, major);
-#endif
- newctx = audit_alloc_context(context->state);
- if (newctx) {
- newctx->previous = context;
- context = newctx;
- tsk->audit_context = newctx;
- } else {
- /* If we can't alloc a new context, the best we
- * can do is to leak memory (any pending putname
- * will be lost). The only other alternative is
- * to abandon auditing. */
- audit_zero_context(context, context->state);
- }
- }
BUG_ON(context->in_syscall || context->name_count);
if (!audit_enabled)
@@ -1881,28 +1828,21 @@ void __audit_syscall_exit(int success, long return_code)
if (!list_empty(&context->killed_trees))
audit_kill_trees(&context->killed_trees);
- if (context->previous) {
- struct audit_context *new_context = context->previous;
- context->previous = NULL;
- audit_free_context(context);
- 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;
- context->target_pid = 0;
- context->target_sid = 0;
- context->sockaddr_len = 0;
- context->type = 0;
- context->fds[0] = -1;
- if (context->state != AUDIT_RECORD_CONTEXT) {
- kfree(context->filterkey);
- context->filterkey = NULL;
- }
- tsk->audit_context = context;
+ audit_free_names(context);
+ unroll_tree_refs(context, NULL, 0);
+ audit_free_aux(context);
+ context->aux = NULL;
+ context->aux_pids = NULL;
+ context->target_pid = 0;
+ context->target_sid = 0;
+ context->sockaddr_len = 0;
+ context->type = 0;
+ context->fds[0] = -1;
+ if (context->state != AUDIT_RECORD_CONTEXT) {
+ kfree(context->filterkey);
+ context->filterkey = NULL;
}
+ tsk->audit_context = context;
}
static inline void handle_one(const struct inode *inode)