From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D77743ED10F; Wed, 5 Aug 2026 21:28:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785965294; cv=none; b=iKVh4tIsBKSDdPUanOxnb+uWN8ivtqfF/cJiN+kd7C4fsFqekyBY/DEO/x6/Psss5J6DOLnBJL4Q/Rqc+tYzv8CMtPaW0EaDsJ85JcWvmKtUvQR1fzobJpcXGgQXYW0WnUnLTL3zPB1e/5V9n0/tj5wypSwoQ+MND2+a9M3mNjE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785965294; c=relaxed/simple; bh=SZQuzrP/ehv3y8PwjY5jperLSL3kBkBVUroC8jwdI3s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LGFNbj73i4S5vFrF5inFLQFxj175w4I9sTRVLe7c0gzP25Pl5fD8GjNTDU4rP2rnKTPEd2DnmZ77CgcYc5zKSI5EBJpuyWmPgmAnffIbIzTlCdklv8FmbDdjIjmD4WkBt5hY1MtkBPNX61CaNwxXgiDRWq14HJaOVvKYoXdipxU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oCifNleg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="oCifNleg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA7291F00A3A; Wed, 5 Aug 2026 21:28:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785965292; bh=RUyxmj3vxNdvlR8l7JK2MtQk0vGO/OK+dQDKwAGY5Bw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oCifNlegBDQFTaomFnstyVvnkPAKjRPveAPbQfAZtxSlMCq44cBuid7ZIuON3w9cw sa7w7+MHpyoV1ojXdd98zFhWJ+Wbf+EbRGD7xbHIdd2X/0tcaNu58+z7xnuciuhH49 GUkfvNUawHrSgtyrzJPQnc984CH2TLA4pOpS160EU9KQsUroJM9HSe2SL+RR8qQhBw tL4NESueckPk0GHaaTsy+ODtgE0VmUL5/GXAFXhv+67WVA3s3agMfIkWhUB64tUc0/ qOetCcLdoIWCrrh9szIjGT+5lKzvKUFbZVbbm4SyeU65lpp6une8onrz96t4gvOidB Z4JHMSNoEfMWw== From: Arnaldo Carvalho de Melo To: Namhyung Kim Cc: Ingo Molnar , Thomas Gleixner , James Clark , Jiri Olsa , Ian Rogers , Adrian Hunter , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , sashiko-bot , Stephane Eranian Subject: [PATCH 11/12] perf jitdump: Validate sym string NUL-termination in code load Date: Wed, 5 Aug 2026 18:27:01 -0300 Message-ID: <20260805212704.267779-12-acme@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260805212704.267779-1-acme@kernel.org> References: <20260805212704.267779-1-acme@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Arnaldo Carvalho de Melo jit_repipe_code_load() computes sym = (void *)jr + sizeof(jr->load) and passes it to jit_emit_elf() which calls strlen(sym) via jit_write_elf(). If code_size equals total_size - sizeof(jr->load), the sym pointer aliases the code blob with no NUL terminator, and strlen() scans past the buffer into adjacent heap memory. Add a memchr() check to verify the symbol name is NUL-terminated within the region between the load header and the code blob before use. Fixes: 598b7c6919c7bbcc ("perf jit: add source line info support") Reported-by: sashiko-bot Cc: Stephane Eranian Assisted-by: Claude:claude-opus-4.6 Reviewed-by: Ian Rogers Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/jitdump.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c index 5a3ea2681fb37105..5898a7d8eb962daf 100644 --- a/tools/perf/util/jitdump.c +++ b/tools/perf/util/jitdump.c @@ -487,6 +487,13 @@ static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr) sym = (void *)((unsigned long)jr + sizeof(jr->load)); code = (unsigned long)jr + jr->load.p.total_size - csize; + + /* sym string lives between the load header and the code blob */ + if (!memchr(sym, '\0', code - (unsigned long)sym)) { + pr_warning("jitdump: unterminated symbol name in code_load record\n"); + return -1; + } + count = jr->load.code_index; idr_size = jd->machine->id_hdr_size; -- 2.55.0