Messages in this thread Patch in this message | | | From | Pranith Kumar <> | Subject | [PATCH 11/16] seccomp: Replace smp_read_barrier_depends() with lockless_dereference() | Date | Thu, 13 Nov 2014 14:24:17 -0500 |
| |
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> --- kernel/seccomp.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/kernel/seccomp.c b/kernel/seccomp.c index 4ef9687..3729b06 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -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; -- 1.9.1
| |