Messages in this thread | | | Date | Wed, 28 Apr 2021 13:31:07 -0700 | From | Kees Cook <> | Subject | Re: [PATCH v26 3/9] x86/cet/ibt: Handle signals for Indirect Branch Tracking |
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On Tue, Apr 27, 2021 at 01:47:14PM -0700, Yu-cheng Yu wrote: > When an indirect CALL/JMP instruction is executed and before it reaches > the target, it is in 'WAIT_ENDBR' status, which can be read from > MSR_IA32_U_CET. The status is part of a task's status before a signal is > raised and preserved in the signal frame. It is restored for sigreturn. > > IBT state machine is described in Intel SDM Vol. 1, Sec. 18.3. > > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-- Kees Cook
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