seccomp: allow perf_event_open if CAP_PERFMON #2534
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Previously perf_event_open was only allowed if both CAP_SYS_ADMIN and CAP_PERFMON were granted. CAP_SYS_ADMIN in particular is a very overloaded capability and is best avoided. This commit enables perf_event_open if either (or both) capabilities are set, in particular this enables containers with only CAP_PERFMON to profile itself. This change does not deny anything new, nor does it enable perf_event_open by default. Signed-off-by: Jonathon Anderson <[email protected]>
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Currently
perf_event_openis only allowed if bothCAP_SYS_ADMINandCAP_PERFMONare enabled.CAP_SYS_ADMINis a very overloaded capability and is best avoided. This PR enablesperf_event_openif either (or both) capabilities are enabled. In particular, this enables a container to profile itself by only enablingCAP_PERFMON.This change does not deny anything new, nor does it enable
perf_event_openby default. In summary:perf_event_openreturn (before)perf_event_openreturn (after)CAP_PERFMON+CAP_SYS_ADMINCAP_PERFMONEPERMCAP_SYS_ADMINENOSYSEPERMEPERM