From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 848B51C4A24; Mon, 10 Mar 2025 18:02:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741629753; cv=none; b=qOt/kUozbbr51XyvSxfMJoEJOB8YZv63iuWpVmGPi6CVMl7Mg2TT3fRht6/6yFbkvboGYL8o9AN95V0/n0WCqguCzBz2MlXhogcRnY1sNEMj1vUGuZri9mRRJOz9QSs0E1kAi/OHlFbACJPAyiq1dlltOURfqQPMqgHhma8pbBA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741629753; c=relaxed/simple; bh=2T/S3LDjsr94lcEbq/7DH2xz0jSUL2bT2SaIRs2E/cw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RUZFQUamrTYNaEdEYKaq9ccwNzJgyPHo56F14DnxPqEyGgDZ149XSb04kV3XscI3AzvJFJcqxEEVwwAueZ5FuoMidb8EZvKApL0khviOJ1ezTppYjbn2ZT3BfBXCEPhXBZ5hYKooPMeG3k6+r5tsDW7wxdt9xUvXSL0gvz7RZXM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gSR7nd+9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="gSR7nd+9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04AA7C4CEE5; Mon, 10 Mar 2025 18:02:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741629753; bh=2T/S3LDjsr94lcEbq/7DH2xz0jSUL2bT2SaIRs2E/cw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gSR7nd+979Tg7KU21oBB1E8k3tTEfgU8+bkXPT5x/FOwj8ZRqPc+OZ7qbLKX02K3T MU7L1wLsLF0ENoHKD1mMjzt9h0G189210ymD9V6alr0ELUxJOfb2AUhhlWJYJ8HPEY mqZbSd5pEe08DjR6WFVQGeO071zUeGFT+cGRToLQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jann Horn , Jens Axboe Subject: [PATCH 5.15 384/620] partitions: mac: fix handling of bogus partition table Date: Mon, 10 Mar 2025 18:03:50 +0100 Message-ID: <20250310170600.750537790@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170545.553361750@linuxfoundation.org> References: <20250310170545.553361750@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: Jann Horn commit 80e648042e512d5a767da251d44132553fe04ae0 upstream. Fix several issues in partition probing: - The bailout for a bad partoffset must use put_dev_sector(), since the preceding read_part_sector() succeeded. - If the partition table claims a silly sector size like 0xfff bytes (which results in partition table entries straddling sector boundaries), bail out instead of accessing out-of-bounds memory. - We must not assume that the partition table contains proper NUL termination - use strnlen() and strncmp() instead of strlen() and strcmp(). Cc: stable@vger.kernel.org Signed-off-by: Jann Horn Link: https://lore.kernel.org/r/20250214-partition-mac-v1-1-c1c626dffbd5@google.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/partitions/mac.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) --- a/block/partitions/mac.c +++ b/block/partitions/mac.c @@ -51,13 +51,25 @@ int mac_partition(struct parsed_partitio } secsize = be16_to_cpu(md->block_size); put_dev_sector(sect); + + /* + * If the "block size" is not a power of 2, things get weird - we might + * end up with a partition straddling a sector boundary, so we wouldn't + * be able to read a partition entry with read_part_sector(). + * Real block sizes are probably (?) powers of two, so just require + * that. + */ + if (!is_power_of_2(secsize)) + return -1; datasize = round_down(secsize, 512); data = read_part_sector(state, datasize / 512, §); if (!data) return -1; partoffset = secsize % 512; - if (partoffset + sizeof(*part) > datasize) + if (partoffset + sizeof(*part) > datasize) { + put_dev_sector(sect); return -1; + } part = (struct mac_partition *) (data + partoffset); if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) { put_dev_sector(sect); @@ -110,8 +122,8 @@ int mac_partition(struct parsed_partitio int i, l; goodness++; - l = strlen(part->name); - if (strcmp(part->name, "/") == 0) + l = strnlen(part->name, sizeof(part->name)); + if (strncmp(part->name, "/", sizeof(part->name)) == 0) goodness++; for (i = 0; i <= l - 4; ++i) { if (strncasecmp(part->name + i, "root",