diff options
| author | Rodrigo Branco <bsdaemon@google.com> | 2023-01-03 14:17:51 -0600 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-01-04 11:25:32 +0100 |
| commit | a664ec9158eeddd75121d39c9a0758016097fa96 (patch) | |
| tree | c158a59624bea7ee7998643dd62cd3da52ab3c0e | |
| parent | 72bb8f8cc088730c4d84117a6906f458c2fc64bb (diff) | |
| download | pci-a664ec9158eeddd75121d39c9a0758016097fa96.tar.gz | |
x86/bugs: Flush IBP in ib_prctl_set()
We missed the window between the TIF flag update and the next reschedule.
Signed-off-by: Rodrigo Branco <bsdaemon@google.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: <stable@vger.kernel.org>
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index d970ddb0cc65be..bca0bd8f484641 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1981,6 +1981,8 @@ static int ib_prctl_set(struct task_struct *task, unsigned long ctrl) if (ctrl == PR_SPEC_FORCE_DISABLE) task_set_spec_ib_force_disable(task); task_update_spec_tif(task); + if (task == current) + indirect_branch_prediction_barrier(); break; default: return -ERANGE; |