perf tools: Use snprintf() in dso__read_running_kernel_build_id()

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dso__read_running_kernel_build_id() uses sprintf() to format a sysfs
path from machine->root_dir into a PATH_MAX buffer.  If root_dir is
close to PATH_MAX in length, appending "/sys/kernel/notes" (18 bytes)
overflows the stack buffer.

Switch to snprintf() with sizeof(path) to prevent the overflow.

Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: cdd059d731 ("perf tools: Move dso_* related functions into dso object")
Cc: Jiri Olsa <jolsa@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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Arnaldo Carvalho de Melo 2026-06-08 07:04:25 -03:00

parent 34d3d93fac

commit 2ea64782a4

1 changed files with 1 additions and 1 deletions

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tools/perf/util/dso.c

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