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prctl: Add force disable speculation

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For certain use cases it is desired to enforce mitigations so they cannot
be undone afterwards. That's important for loader stubs which want to
prevent a child from disabling the mitigation again. Will also be used for
seccomp(). The extra state preserving of the prctl state for SSB is a
preparatory step for EBPF dymanic speculation control.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2018-05-03 22:09:15 +02:00
parent f9544b2b07
commit 356e4bfff2
5 changed files with 59 additions and 24 deletions
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include/uapi/linux/prctl.h
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@@ -217,5 +217,6 @@ struct prctl_mm_map {
# define PR_SPEC_PRCTL (1UL << 0)
# define PR_SPEC_ENABLE (1UL << 1)
# define PR_SPEC_DISABLE (1UL << 2)
# define PR_SPEC_FORCE_DISABLE (1UL << 3)
#endif /* _LINUX_PRCTL_H */