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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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3
fs/proc/array.c
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@ -344,6 +344,9 @@ static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
case PR_SPEC_NOT_AFFECTED:
seq_printf(m, "not vulnerable");
break;
case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
seq_printf(m, "thread force mitigated");
break;
case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
seq_printf(m, "thread mitigated");
break;