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74eedeba45
- Correct the permission checks for perf event which send SIGTRAP to a
different process and clean up that code to be more readable.
- Prevent an out of bound MSR access in the x86 perf code which happened
due to an incomplete limiting to the actually available hardware
counters.
- Prevent access to the AMD64_EVENTSEL_HOSTONLY bit when running inside a
guest.
- Handle small core counter re-enabling correctly by issuing an ACK right
before reenabling it to prevent a stale PEBS record being kept around.
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Merge tag 'perf-urgent-2021-08-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Thomas Gleixner:
"A set of perf fixes:
- Correct the permission checks for perf event which send SIGTRAP to
a different process and clean up that code to be more readable.
- Prevent an out of bound MSR access in the x86 perf code which
happened due to an incomplete limiting to the actually available
hardware counters.
- Prevent access to the AMD64_EVENTSEL_HOSTONLY bit when running
inside a guest.
- Handle small core counter re-enabling correctly by issuing an ACK
right before reenabling it to prevent a stale PEBS record being
kept around"
* tag 'perf-urgent-2021-08-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel: Apply mid ACK for small core
perf/x86/amd: Don't touch the AMD64_EVENTSEL_HOSTONLY bit inside the guest
perf/x86: Fix out of bound MSR access
perf: Refactor permissions check into perf_check_permission()
perf: Fix required permissions if sigtrap is requested
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