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seccomp: Replace smp_read_barrier_depends() with lockless_dereference() 

Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the change.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Pranith Kumar 2014-11-21 10:06:01 -05:00 committed by Kees Cook
parent b3bddffd35
commit 8225d3853f
1 changed files with 3 additions and 4 deletions
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7
kernel/seccomp.c
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@ -175,17 +175,16 @@ static int seccomp_check_filter(struct sock_filter *filter, unsigned int flen)
*/
static u32 seccomp_run_filters(struct seccomp_data *sd)
{
struct seccomp_filter *f = ACCESS_ONCE(current->seccomp.filter);
struct seccomp_data sd_local;
u32 ret = SECCOMP_RET_ALLOW;
/* Make sure cross-thread synced filter points somewhere sane. */
struct seccomp_filter *f =
lockless_dereference(current->seccomp.filter);
/* Ensure unexpected behavior doesn't result in failing open. */
if (unlikely(WARN_ON(f == NULL)))
return SECCOMP_RET_KILL;
/* Make sure cross-thread synced filter points somewhere sane. */
smp_read_barrier_depends();
if (!sd) {
populate_seccomp_data(&sd_local);
sd = &sd_local;