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 D8D383B6C17; Tue, 21 Jul 2026 22:00:15 +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=1784671217; cv=none; b=I0fxvVPPPPu3hrSanLydN5Wem1kgHa1lGcK+pxHX8zGU9dDKN1m+InO0jTtf8r4N8JCy+lQa2FPtJBI1/yeeqAeRHlr2kvFqGl0u9lshsTO9L0IAWQCjvkkd+TPsxgqyRVu0yfCQkS2v78K2BDsr1BMUh6R9x2+PBeHGJK2/HBw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671217; c=relaxed/simple; bh=2IIJJ6LEzgjbdghxWiYrgFjDO1WMA77iHyaOuBOYQF4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=V6S3P04yPa4cEobeijeyRQfBqk3ND44z/fAj9or81JDQ0my50u0Fp/zkRyme8VGce7gXxGGU4EJjOYQSqFJwPKA16FAaOJvfhSGOKTGOxJsnqR+6d38VBKRNFAe2rsn2Ac5/6VWpVcpao2Zrk8y2meeMi1NrYQVxoAGhcvpbTmI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=V57ltza4; 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="V57ltza4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D45C1F000E9; Tue, 21 Jul 2026 22:00:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671215; bh=kPwiSp767EM8GImesUaB6rgFA3rMMcMPcnCesymThW0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=V57ltza4dFj+1j7ZtfkblB8zCwY7ZSKxlSCJV7fxQlwASqGjm1dZnlqQItormSj0B Yxx7B8RpgKDS54GQA0BiZ7hHjNVE5Xdv+2pxNUy4yW5i58aFpE/wKERc4MR4pYnUm6 wn36evMwz5xxFWj3BBYqoNUs5ZE6FMzH1tL/qfgA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bryam Vargas , Philippe De Muyter , Jens Axboe Subject: [PATCH 5.15 161/843] partitions: aix: bound the pp_count scan to the ppe array Date: Tue, 21 Jul 2026 17:16:36 +0200 Message-ID: <20260721152409.636619174@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: Bryam Vargas commit 2dc0bfd2fe355fb930de63c2f2eb8ced8570c579 upstream. aix_partition() reads the physical volume descriptor into a fixed-size struct pvd and then scans its physical-partition-extent array: int numpps = be16_to_cpu(pvd->pp_count); ... for (i = 0; i < numpps; i += 1) { struct ppe *p = pvd->ppe + i; ... lp_ix = be16_to_cpu(p->lp_ix); pvd points at a single kmalloc()'d struct pvd whose ppe[] member holds a fixed ARRAY_SIZE(pvd->ppe) (1016) entries, but the loop runs up to the on-disk pp_count. pp_count is an unvalidated __be16 read straight from the descriptor, so a crafted AIX image with pp_count larger than 1016 drives the loop to read pvd->ppe[i] past the end of the allocation (up to 65535 entries, ~2 MB out of bounds). The partition scan runs without mounting anything, when a block device with a crafted AIX/IBM partition table appears (an attacker-supplied image attached with losetup -P, or a device auto-scanned by udev), via msdos_partition() -> aix_partition(). Clamp the scan to the number of entries the ppe[] array can hold. Fixes: 6ceea22bbbc8 ("partitions: add aix lvm partition support files") Cc: stable@vger.kernel.org Signed-off-by: Bryam Vargas Acked-by: Philippe De Muyter Link: https://patch.msgid.link/20260607064137.302574-1-hexlabsecurity@proton.me Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/partitions/aix.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/block/partitions/aix.c +++ b/block/partitions/aix.c @@ -228,6 +228,15 @@ int aix_partition(struct parsed_partitio int next_lp_ix = 1; int lp_ix; + /* + * pvd was read into a fixed-size struct pvd whose ppe[] array + * holds ARRAY_SIZE(pvd->ppe) entries. pp_count is an + * unvalidated on-disk __be16, so clamp the scan to the array + * size to avoid walking past the allocation. + */ + if (numpps > ARRAY_SIZE(pvd->ppe)) + numpps = ARRAY_SIZE(pvd->ppe); + for (i = 0; i < numpps; i += 1) { struct ppe *p = pvd->ppe + i; unsigned int lv_ix;