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Fri, 06 Feb 2026 00:37:44 -0800 (PST) Received: from fedora ([61.74.238.173]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-824418812d2sm1788185b3a.43.2026.02.06.00.37.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Feb 2026 00:37:43 -0800 (PST) From: SeungJu Cheon To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim Cc: Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, SeungJu Cheon Subject: [PATCH] perf header: Validate build_id filename length to prevent buffer overflow Date: Fri, 6 Feb 2026 17:37:21 +0900 Message-ID: <20260206083721.2277438-1-suunj1331@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The build_id parsing functions calculate a filename length from the event header size and read directly into a stack buffer of PATH_MAX bytes without bounds checking. A malformed perf.data file with a crafted header.size can cause the length to be negative or exceed PATH_MAX, resulting in a stack buffer overflow. Add bounds checking for the filename length in both perf_header__read_build_ids() and the ABI quirk variant. Signed-off-by: SeungJu Cheon --- tools/perf/util/header.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index f5cad377c99e..208ccaa62399 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2335,6 +2335,9 @@ static int perf_header__read_build_ids_abi_quirk(stru= ct perf_header *header, perf_event_header__bswap(&old_bev.header); =20 len =3D old_bev.header.size - sizeof(old_bev); + if (len < 0 || len >=3D PATH_MAX) + return -1; + if (readn(input, filename, len) !=3D len) return -1; =20 @@ -2377,6 +2380,9 @@ static int perf_header__read_build_ids(struct perf_he= ader *header, perf_event_header__bswap(&bev.header); =20 len =3D bev.header.size - sizeof(bev); + if (len < 0 || len >=3D PATH_MAX) + goto out; + if (readn(input, filename, len) !=3D len) goto out; /* --=20 2.52.0