[PATCH] make vm86 call audit_syscall_exit

hi,

The motivation behind the patch below was to address messages in
/var/log/messages such as:

Jan 31 10:54:15 mets kernel: audit(:0): major=252 name_count=0: freeing
multiple contexts (1)
Jan 31 10:54:15 mets kernel: audit(:0): major=113 name_count=0: freeing
multiple contexts (2)

I can reproduce by running 'get-edid' from:
http://john.fremlin.de/programs/linux/read-edid/.

These messages come about in the log b/c the vm86 calls do not exit via
the normal system call exit paths and thus do not call
'audit_syscall_exit'. The next system call will then free the context for
itself and for the vm86 context, thus generating the above messages. This
patch addresses the issue by simply adding a call to 'audit_syscall_exit'
from the vm86 code.

Besides fixing the above error messages the patch also now allows vm86
system calls to become auditable. This is useful since strace does not
appear to properly record the return values from sys_vm86.

I think this patch is also a step in the right direction in terms of
cleaning up some core auditing code. If we can correct any other paths
that do not properly call the audit exit and entries points, then we can
also eliminate the notion of context chaining.

I've tested this patch by verifying that the log messages no longer
appear, and that the audit records for sys_vm86 appear to be correct.
Also, 'read_edid' produces itentical output.

thanks,

-Jason

Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 5 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d7e7e63..cfaa4a2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -966,11 +966,6 @@ void audit_syscall_entry(struct task_struct *tsk, int arch, int major,
 	if (context->in_syscall) {
 		struct audit_context *newctx;
 
-#if defined(__NR_vm86) && defined(__NR_vm86old)
-		/* vm86 mode should only be entered once */
-		if (major == __NR_vm86 || major == __NR_vm86old)
-			return;
-#endif
 #if AUDIT_DEBUG
 		printk(KERN_ERR
 		       "audit(:%d) pid=%d in syscall=%d;"