linux

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Denis Nikitin 159c7db3cc perf session: Remap buf if there is no space for event

[ Upstream commit bc21e74d4775f883ae1f542c1f1dc7205b15d925 ]

If a perf event doesn't fit into remaining buffer space return NULL to
remap buf and fetch the event again.

Keep the logic to error out on inadequate input from fuzzing.

This fixes perf failing on ChromeOS (with 32b userspace):

  $ perf report -v -i perf.data
  ...
  prefetch_event: head=0x1fffff8 event->header_size=0x30, mmap_size=0x2000000: fuzzed or compressed perf.data?
  Error:
  failed to process sample

Fixes: 57fc032ad643ffd0 ("perf session: Avoid infinite loop when seeing invalid header.size")
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Denis Nikitin <denik@chromium.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220330031130.2152327-1-denik@chromium.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-04-13 20:59:20 +02:00

accounting

…

arch

x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE

2022-03-11 12:22:31 +01:00

bootconfig

tools/bootconfig: Define memblock_free_ptr() to fix build error

2021-09-15 09:49:48 -07:00

bpf

bpftool: Fix the error when lookup in no-btf maps

2022-04-08 14:23:31 +02:00