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linux/tools/lib/symbol
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Rui Qi 68018df3f5 perf: Fix off-by-one stack buffer overflow in kallsyms__parse() 
In kallsyms__parse(), the loop reading symbol names iterates with i <
sizeof(symbol_name), which allows i to reach sizeof(symbol_name) upon
loop exit. The subsequent symbol_name[i] = '\0' then writes one byte
past the end of the stack-allocated symbol_name[] array.

Fix this by changing the loop bound to KSYM_NAME_LEN, so the null
terminator always lands within the array. The overflow is triggerable by
a kallsyms entry with a symbol name of KSYM_NAME_LEN+1 or more
characters (e.g., long Rust mangled names or a malicious
/proc/kallsyms).

Fixes: 53df2b9344 ("libsymbols kallsyms: Parse using io api")
Signed-off-by: Rui Qi <qirui.001@bytedance.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
History 2026-06-04 10:58:47 -03:00
..
Build tool lib symbol: Add Makefile/Build 2022-11-16 12:17:15 -03:00
kallsyms.c perf: Fix off-by-one stack buffer overflow in kallsyms__parse() 2026-06-04 10:58:47 -03:00
kallsyms.h kallsyms: increase maximum kernel symbol length to 512 2022-09-28 08:56:25 +02:00
Makefile tools: Drop nonsensical -O6 2024-09-11 13:08:36 -03:00