Ian Rogers 6bfb4c571b perf test cpumap: Avoid use-after-free following merge
Previously cpu maps in the test weren't modified by calls to the cpu map
API, however, perf_cpu_map__merge was modified so the left hand argument
was updated.

In the test this meant the maps copy of the "two" map was put/deleted in
the merge meaning when accessed via maps, the pointer was stale and to
the put/deleted memory.

To fix this add an extra layer of indirection to the maps array, so the
updated value of two is accessed.

Fixes: a9d2217556 ("libperf cpumap: Refactor perf_cpu_map__merge()")
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250108051511.1720369-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2025-01-08 17:40:05 -03:00
2024-09-01 20:43:24 -07:00
2022-09-28 09:02:20 +02:00
2024-12-08 14:03:39 -08:00
2024-03-18 03:36:32 -06:00

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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