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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, linux-mm@kvack.org,
	mm-commits@vger.kernel.org, phillip@squashfs.org.uk,
	stable@vger.kernel.org, torvalds@linux-foundation.org
Subject: [patch 02/14] squashfs: add more sanity checks in id lookup
Date: Tue, 09 Feb 2021 13:41:53 -0800
Message-ID: <20210209214153.l0Cs-q9SO%akpm@linux-foundation.org> (raw)
In-Reply-To: <20210209134115.4d933d446165cd0ed8977b03@linux-foundation.org>

From: Phillip Lougher <phillip@squashfs.org.uk>
Subject: squashfs: add more sanity checks in id lookup

Sysbot has reported a number of "slab-out-of-bounds reads" and
"use-after-free read" errors which has been identified as being caused by
a corrupted index value read from the inode.  This could be because the
metadata block is uncompressed, or because the "compression" bit has been
corrupted (turning a compressed block into an uncompressed block).

This patch adds additional sanity checks to detect this, and the
following corruption.

1. It checks against corruption of the ids count.  This can either
   lead to a larger table to be read, or a smaller than expected
   table to be read.

   In the case of a too large ids count, this would often have been
   trapped by the existing sanity checks, but this patch introduces
   a more exact check, which can identify too small values.

2. It checks the contents of the index table for corruption.

Link: https://lkml.kernel.org/r/20210204130249.4495-3-phillip@squashfs.org.uk
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Reported-by: syzbot+b06d57ba83f604522af2@syzkaller.appspotmail.com
Reported-by: syzbot+c021ba012da41ee9807c@syzkaller.appspotmail.com
Reported-by: syzbot+5024636e8b5fd19f0f19@syzkaller.appspotmail.com
Reported-by: syzbot+bcbc661df46657d0fa4f@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/squashfs/id.c             |   40 ++++++++++++++++++++++++++-------
 fs/squashfs/squashfs_fs_sb.h |    1 
 fs/squashfs/super.c          |    6 ++--
 fs/squashfs/xattr.h          |   10 +++++++-
 4 files changed, 45 insertions(+), 12 deletions(-)

--- a/fs/squashfs/id.c~squashfs-add-more-sanity-checks-in-id-lookup
+++ a/fs/squashfs/id.c
@@ -35,10 +35,15 @@ int squashfs_get_id(struct super_block *
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
 	int block = SQUASHFS_ID_BLOCK(index);
 	int offset = SQUASHFS_ID_BLOCK_OFFSET(index);
-	u64 start_block = le64_to_cpu(msblk->id_table[block]);
+	u64 start_block;
 	__le32 disk_id;
 	int err;
 
+	if (index >= msblk->ids)
+		return -EINVAL;
+
+	start_block = le64_to_cpu(msblk->id_table[block]);
+
 	err = squashfs_read_metadata(sb, &disk_id, &start_block, &offset,
 							sizeof(disk_id));
 	if (err < 0)
@@ -56,7 +61,10 @@ __le64 *squashfs_read_id_index_table(str
 		u64 id_table_start, u64 next_table, unsigned short no_ids)
 {
 	unsigned int length = SQUASHFS_ID_BLOCK_BYTES(no_ids);
+	unsigned int indexes = SQUASHFS_ID_BLOCKS(no_ids);
+	int n;
 	__le64 *table;
+	u64 start, end;
 
 	TRACE("In read_id_index_table, length %d\n", length);
 
@@ -67,20 +75,36 @@ __le64 *squashfs_read_id_index_table(str
 		return ERR_PTR(-EINVAL);
 
 	/*
-	 * length bytes should not extend into the next table - this check
-	 * also traps instances where id_table_start is incorrectly larger
-	 * than the next table start
+	 * The computed size of the index table (length bytes) should exactly
+	 * match the table start and end points
 	 */
-	if (id_table_start + length > next_table)
+	if (length != (next_table - id_table_start))
 		return ERR_PTR(-EINVAL);
 
 	table = squashfs_read_table(sb, id_table_start, length);
+	if (IS_ERR(table))
+		return table;
 
 	/*
-	 * table[0] points to the first id lookup table metadata block, this
-	 * should be less than id_table_start
+	 * table[0], table[1], ... table[indexes - 1] store the locations
+	 * of the compressed id blocks.   Each entry should be less than
+	 * the next (i.e. table[0] < table[1]), and the difference between them
+	 * should be SQUASHFS_METADATA_SIZE or less.  table[indexes - 1]
+	 * should be less than id_table_start, and again the difference
+	 * should be SQUASHFS_METADATA_SIZE or less
 	 */
-	if (!IS_ERR(table) && le64_to_cpu(table[0]) >= id_table_start) {
+	for (n = 0; n < (indexes - 1); n++) {
+		start = le64_to_cpu(table[n]);
+		end = le64_to_cpu(table[n + 1]);
+
+		if (start >= end || (end - start) > SQUASHFS_METADATA_SIZE) {
+			kfree(table);
+			return ERR_PTR(-EINVAL);
+		}
+	}
+
+	start = le64_to_cpu(table[indexes - 1]);
+	if (start >= id_table_start || (id_table_start - start) > SQUASHFS_METADATA_SIZE) {
 		kfree(table);
 		return ERR_PTR(-EINVAL);
 	}
--- a/fs/squashfs/squashfs_fs_sb.h~squashfs-add-more-sanity-checks-in-id-lookup
+++ a/fs/squashfs/squashfs_fs_sb.h
@@ -64,5 +64,6 @@ struct squashfs_sb_info {
 	unsigned int				inodes;
 	unsigned int				fragments;
 	int					xattr_ids;
+	unsigned int				ids;
 };
 #endif
--- a/fs/squashfs/super.c~squashfs-add-more-sanity-checks-in-id-lookup
+++ a/fs/squashfs/super.c
@@ -166,6 +166,7 @@ static int squashfs_fill_super(struct su
 	msblk->directory_table = le64_to_cpu(sblk->directory_table_start);
 	msblk->inodes = le32_to_cpu(sblk->inodes);
 	msblk->fragments = le32_to_cpu(sblk->fragments);
+	msblk->ids = le16_to_cpu(sblk->no_ids);
 	flags = le16_to_cpu(sblk->flags);
 
 	TRACE("Found valid superblock on %pg\n", sb->s_bdev);
@@ -177,7 +178,7 @@ static int squashfs_fill_super(struct su
 	TRACE("Block size %d\n", msblk->block_size);
 	TRACE("Number of inodes %d\n", msblk->inodes);
 	TRACE("Number of fragments %d\n", msblk->fragments);
-	TRACE("Number of ids %d\n", le16_to_cpu(sblk->no_ids));
+	TRACE("Number of ids %d\n", msblk->ids);
 	TRACE("sblk->inode_table_start %llx\n", msblk->inode_table);
 	TRACE("sblk->directory_table_start %llx\n", msblk->directory_table);
 	TRACE("sblk->fragment_table_start %llx\n",
@@ -236,8 +237,7 @@ static int squashfs_fill_super(struct su
 allocate_id_index_table:
 	/* Allocate and read id index table */
 	msblk->id_table = squashfs_read_id_index_table(sb,
-		le64_to_cpu(sblk->id_table_start), next_table,
-		le16_to_cpu(sblk->no_ids));
+		le64_to_cpu(sblk->id_table_start), next_table, msblk->ids);
 	if (IS_ERR(msblk->id_table)) {
 		errorf(fc, "unable to read id index table");
 		err = PTR_ERR(msblk->id_table);
--- a/fs/squashfs/xattr.h~squashfs-add-more-sanity-checks-in-id-lookup
+++ a/fs/squashfs/xattr.h
@@ -17,8 +17,16 @@ extern int squashfs_xattr_lookup(struct
 static inline __le64 *squashfs_read_xattr_id_table(struct super_block *sb,
 		u64 start, u64 *xattr_table_start, int *xattr_ids)
 {
+	struct squashfs_xattr_id_table *id_table;
+
+	id_table = squashfs_read_table(sb, start, sizeof(*id_table));
+	if (IS_ERR(id_table))
+		return (__le64 *) id_table;
+
+	*xattr_table_start = le64_to_cpu(id_table->xattr_table_start);
+	kfree(id_table);
+
 	ERROR("Xattrs in filesystem, these will be ignored\n");
-	*xattr_table_start = start;
 	return ERR_PTR(-ENOTSUPP);
 }
 
_

  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09 21:41 incoming Andrew Morton
2021-02-09 21:41 ` [patch 01/14] squashfs: avoid out of bounds writes in decompressors Andrew Morton
2021-02-09 21:41 ` Andrew Morton [this message]
2021-02-09 21:41 ` [patch 03/14] squashfs: add more sanity checks in inode lookup Andrew Morton
2021-02-09 21:42 ` [patch 04/14] squashfs: add more sanity checks in xattr id lookup Andrew Morton
2021-02-09 21:42 ` [patch 05/14] kasan: fix stack traces dependency for HW_TAGS Andrew Morton
2021-02-09 21:42 ` [patch 06/14] firmware_loader: align .builtin_fw to 8 Andrew Morton
2021-02-09 21:42 ` [patch 07/14] mm/mremap: fix BUILD_BUG_ON() error in get_extent Andrew Morton
2021-02-09 21:42 ` [patch 08/14] tmpfs: disallow CONFIG_TMPFS_INODE64 on s390 Andrew Morton
2021-02-09 21:42 ` [patch 09/14] tmpfs: disallow CONFIG_TMPFS_INODE64 on alpha Andrew Morton
2021-02-09 22:03   ` Linus Torvalds
2021-02-10 13:34     ` Heiko Carstens
2021-02-10 17:27       ` Heiko Carstens
2021-02-10 19:17       ` Linus Torvalds
2021-02-10 19:55         ` Arnd Bergmann
2021-02-11 18:45         ` Heiko Carstens
2021-02-09 21:42 ` [patch 10/14] selftests/vm: rename file run_vmtests to run_vmtests.sh Andrew Morton
2021-02-09 21:42 ` [patch 11/14] MAINTAINERS: update Andrey Ryabinin's email address Andrew Morton
2021-02-09 21:42 ` [patch 12/14] Revert "mm: memcontrol: avoid workload stalls when lowering memory.high" Andrew Morton
2021-02-09 21:42 ` [patch 13/14] mm, slub: better heuristic for number of cpus when calculating slab order Andrew Morton
2021-02-10 14:34   ` Vlastimil Babka
2021-02-10 19:22     ` Linus Torvalds
2021-02-09 21:42 ` [patch 14/14] nilfs2: make splice write available again Andrew Morton
2021-02-10 19:30 ` incoming Linus Torvalds

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