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| author | Rodrigo Branco <bsdaemon@google.com> | 2023-01-03 23:17:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-18 11:26:41 +0300 |
| commit | e1feec3bd63b7e526f92464def38a5fbe437dc99 (patch) | |
| tree | 6d266ab457b715412d39c7812f772fe5caf7b1e3 | |
| parent | 27b5b63973d19f791f591c382c49b797eb9b6eea (diff) | |
| download | linux-e1feec3bd63b7e526f92464def38a5fbe437dc99.tar.xz | |
x86/bugs: Flush IBP in ib_prctl_set()
commit a664ec9158eeddd75121d39c9a0758016097fa96 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 12c687455430..80dfd84c3ca8 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1776,6 +1776,8 @@ 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; |