diff options
| -rw-r--r-- | tools/perf/util/symbol-elf.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index 36a0304707e1..06cfb84f86eb 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -961,8 +961,13 @@ int sysfs__read_build_id(const char *filename, struct build_id *bid) err = 0; break; } - } else if (read(fd, bf, descsz) != (ssize_t)descsz) - break; + } else { + /* descsz from untrusted file — clamp to buffer */ + if (descsz > sizeof(bf)) + break; + if (read(fd, bf, descsz) != (ssize_t)descsz) + break; + } } else { size_t n; |