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x86/bugs: Flush IBP in ib_prctl_set()
commit a664ec9158
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>
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@ -1787,6 +1787,8 @@ static int ib_prctl_set(struct task_struct *task, unsigned long ctrl)
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if (ctrl == PR_SPEC_FORCE_DISABLE)
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task_set_spec_ib_force_disable(task);
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task_update_spec_tif(task);
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if (task == current)
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indirect_branch_prediction_barrier();
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break;
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default:
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return -ERANGE;
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