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mirror_ubuntu-kernels/arch/x86/events
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Tristan Hume 1d9093457b perf/x86/intel/pt: Fix crash with stop filters in single-range mode 
Add a check for !buf->single before calling pt_buffer_region_size in a
place where a missing check can cause a kernel crash.

Fixes a bug introduced by commit 670638477a ("perf/x86/intel/pt:
Opportunistically use single range output mode"), which added a
support for PT single-range output mode. Since that commit if a PT
stop filter range is hit while tracing, the kernel will crash because
of a null pointer dereference in pt_handle_status due to calling
pt_buffer_region_size without a ToPA configured.

The commit which introduced single-range mode guarded almost all uses of
the ToPA buffer variables with checks of the buf->single variable, but
missed the case where tracing was stopped by the PT hardware, which
happens when execution hits a configured stop filter.

Tested that hitting a stop filter while PT recording successfully
records a trace with this patch but crashes without this patch.

Fixes: 670638477a ("perf/x86/intel/pt: Opportunistically use single range output mode")
Signed-off-by: Tristan Hume <tristan@thume.ca>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@kernel.org
Link: https://lkml.kernel.org/r/20220127220806.73664-1-tristan@thume.ca
2022-02-02 13:11:40 +01:00
..
amd x86/events/amd/iommu: Remove redundant assignment to variable shift 2021-12-28 21:30:05 +01:00
intel perf/x86/intel/pt: Fix crash with stop filters in single-range mode 2022-02-02 13:11:40 +01:00
zhaoxin x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
core.c Peter Zijlstra says: 2022-01-12 16:26:58 -08:00
Kconfig perf/amd/uncore: Allow the driver to be built as a module 2021-08-26 09:14:36 +02:00
Makefile perf/x86/rapl: Fix RAPL config variable bug 2020-06-02 11:52:56 +02:00
msr.c perf/x86/msr: Add Sapphire Rapids CPU support 2021-10-15 11:25:26 +02:00
perf_event.h perf/x86/intel/lbr: Support LBR format V7 2022-01-18 12:09:48 +01:00
probe.c perf/x86/rapl: Add msr mask support 2021-02-10 14:44:54 +01:00
probe.h perf/x86/rapl: Add msr mask support 2021-02-10 14:44:54 +01:00
rapl.c perf/x86/rapl: fix AMD event handling 2022-01-18 12:09:48 +01:00