Control-flow Enforcement [1] [2] introduces a new control-protection fault,
which is triggered by a branch instruction (call, ret, or jmp) violating
branch-enforcement rules. When the signal is delivered, si_code is set to
SEGV_CPERR. Add the code to sigaction.2, and while at it, clarify when
si_addr is set.
[1] Intel 64 and IA-32 Architectures Software Developer's Manual:
https://software.intel.com/en-us/download/intel-64-and-ia-32-
architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4
[2] CET Shadow Stack patches v21:
https://lkml.kernel.org/r/20210217222730.15819-1-yu-cheng.yu@xxxxxxxxx/
https://lkml.kernel.org/r/20210217223135.16790-1-yu-cheng.yu@xxxxxxxxx/
Yu-cheng Yu (2):
sigaction.2: Add SEGV_CPERR
sigaction.2: wfix - Clarify si_addr description.
man2/sigaction.2 | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
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2.21.0
