linux-kernel - [PATCH] partitions: mac: fix handling of bogus partition table

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Message-Id: <20250214-partition-mac-v1-1-c1c626dffbd5@google.com>
Date: Fri, 14 Feb 2025 02:39:50 +0100
From: Jann Horn <jannh@...gle.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 stable@...r.kernel.org, Jann Horn <jannh@...gle.com>
Subject: [PATCH] partitions: mac: fix handling of bogus partition table

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@...r.kernel.org
Signed-off-by: Jann Horn <jannh@...gle.com>
---
 block/partitions/mac.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/block/partitions/mac.c b/block/partitions/mac.c
index c80183156d68020e0e14974308ac751b3df84421..b02530d986297058de0db929fbf638a76fc44508 100644
--- a/block/partitions/mac.c
+++ b/block/partitions/mac.c
@@ -53,13 +53,25 @@ int mac_partition(struct parsed_partitions *state)
 	}
 	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, &sect);
 	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);
@@ -112,8 +124,8 @@ int mac_partition(struct parsed_partitions *state)
 				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",

---
base-commit: ab68d7eb7b1a64f3f4710da46cc5f93c6c154942
change-id: 20250214-partition-mac-2e7114c62223

-- 
Jann Horn <jannh@...gle.com>