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SubjectRe: [PATCH v19 3/7] x86/cet/ibt: Handle signals for Indirect Branch Tracking
On Wed, Feb 03, 2021 at 02:58:58PM -0800, 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 <>

Reviewed-by: Kees Cook <>

Kees Cook

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