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| author | Rodrigo Branco <bsdaemon@google.com> | 2023-01-03 14:17:51 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-12 12:02:44 +0100 |
| commit | e8377f0456fb6738a4668d4df16c13d7599925fd (patch) | |
| tree | af3681f35b51480c832fba87a37e001b78e45d03 /arch | |
| parent | 5bd3c7abeb69fb4133418b846a1c6dc11313d6f0 (diff) | |
| download | linux-e8377f0456fb6738a4668d4df16c13d7599925fd.tar.gz linux-e8377f0456fb6738a4668d4df16c13d7599925fd.tar.bz2 linux-e8377f0456fb6738a4668d4df16c13d7599925fd.zip | |
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>
Diffstat (limited to 'arch')
| -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 6daf84229548..16d8e43be775 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1951,6 +1951,8 @@ 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; |