From: disconnect3d dominik.b.czarnota@gmail.com
commit db2c549407d4a76563c579e4768f7d6d32afefba upstream.
This patch fixes an off-by-one error in strncpy size argument in tools/perf/util/map.c. The issue is that in:
strncmp(filename, "/system/lib/", 11)
the passed string literal: "/system/lib/" has 12 bytes (without the NULL byte) and the passed size argument is 11. As a result, the logic won't match the ending "/" byte and will pass filepaths that are stored in other directories e.g. "/system/libmalicious/bin" or just "/system/libmalicious".
This functionality seems to be present only on Android. I assume the /system/ directory is only writable by the root user, so I don't think this bug has much (or any) security impact.
Fixes: eca818369996 ("perf tools: Add automatic remapping of Android libraries") Signed-off-by: disconnect3d dominik.b.czarnota@gmail.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Changbin Du changbin.du@intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: John Keeping john@metanate.com Cc: Mark Rutland mark.rutland@arm.com Cc: Michael Lentine mlentine@google.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Song Liu songliubraving@fb.com Cc: Stephane Eranian eranian@google.com Link: http://lore.kernel.org/lkml/20200309104855.3775-1-dominik.b.czarnota@gmail.c... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/perf/util/map.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -90,7 +90,7 @@ static inline bool replace_android_lib(c return true; }
- if (!strncmp(filename, "/system/lib/", 11)) { + if (!strncmp(filename, "/system/lib/", 12)) { char *ndk, *app; const char *arch; size_t ndk_length;