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 0660E433BCA; Tue, 21 Jul 2026 22:11:47 +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=1784671908; cv=none; b=nU0jf+d2Gf/7D2A8m91A4O0rB3bbUn701MnC29TsYCkSUiM9bnKCMb+0k+HDR+lpIQptoY45b4WB2RF8oK5rSpZkjo5hOAdlneMkQAhsCwvlHchEKoI+2DJIidyu+BAAp9QbUOnMYXvnWjnmqla48rAFCoWF/F7vE7Y6CMA8Z6s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671908; c=relaxed/simple; bh=KTu2imYI37fVcs42h5qVu8HTEK1m5klSO9+siMJrL2U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ikLByfYHps0U0lrQXrirY/oI+AKuG/nBuFiAPe4oH1tkAuqJ5qu32YtLspMXm1PRlw9vnXM5dN+rkDBEpHxeZJx7lwGC4roSQ1DlcVMlT4upl8xqHVLvxVMISS7lgT5ZAwTujNeGq0V9jeWfLPoryZNmjmG4sXZVdVp59Rh+N5Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=A0XNOya/; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="A0XNOya/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B8881F00A3D; Tue, 21 Jul 2026 22:11:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671906; bh=6GaUHGEJQamteXEjT0xUTX2vfwvFrB2RFDdJJTfz2iA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=A0XNOya/M1If57c6oktzSPgtTBm/gN3JXynL/RpydJsETXBheYP+CBPQXminz0kCh Wg0ylW0Uly+YEEXlR8LWgGFQd1VGlunwY66n2Ln7LvisdVISFpRPlsIWA3e1fLetZU L5lJsmO2u9koiyd6HgSXKjzDKI7G7EZyjDU+B4c8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, sashiko-bot , Namhyung Kim , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 5.15 424/843] perf symbols: Add bounds checks to read_build_id() note iteration in minimal build Date: Tue, 21 Jul 2026 17:20:59 +0200 Message-ID: <20260721152415.572605121@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arnaldo Carvalho de Melo [ Upstream commit 52e582e316c48c53bb3082c29f7862ebc554087e ] symbol-minimal.c's read_build_id() iterates ELF notes with the same pattern as symbol-elf.c's elf_read_build_id(): pointer arithmetic driven by n_namesz and n_descsz from 32-bit note header fields, without validating that the name and desc fit within the note section data. A malformed ELF file with oversized note sizes causes out-of-bounds reads past the section data buffer. Add the same bounds check as the libelf path: validate namesz and descsz individually against remaining data before advancing the pointer, avoiding size_t overflow on 32-bit. Fixes: b691f64360ecec49 ("perf symbols: Implement poor man's ELF parser") Reported-by: sashiko-bot Cc: Namhyung Kim Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/symbol-minimal.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/symbol-minimal.c b/tools/perf/util/symbol-minimal.c index f9eb0bee7f157a..cd3bef5644a0b6 100644 --- a/tools/perf/util/symbol-minimal.c +++ b/tools/perf/util/symbol-minimal.c @@ -1,3 +1,4 @@ +#include "debug.h" #include "dso.h" #include "symbol.h" #include "symsrc.h" @@ -45,7 +46,7 @@ static int read_build_id(void *note_data, size_t note_len, struct build_id *bid, ptr = note_data; while (ptr < (note_data + note_len)) { const char *name; - size_t namesz, descsz; + size_t namesz, descsz, remaining; nhdr = ptr; if (need_swap) { @@ -57,6 +58,14 @@ static int read_build_id(void *note_data, size_t note_len, struct build_id *bid, namesz = NOTE_ALIGN(nhdr->n_namesz); descsz = NOTE_ALIGN(nhdr->n_descsz); + /* validate individually to avoid size_t overflow on 32-bit */ + remaining = note_data + note_len - ptr - sizeof(*nhdr); + if (namesz > remaining || descsz > remaining - namesz) { + pr_warning("%s: oversized note: n_namesz=%u, n_descsz=%u\n", + __func__, nhdr->n_namesz, nhdr->n_descsz); + break; + } + ptr += sizeof(*nhdr); name = ptr; ptr += namesz; -- 2.53.0