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BACKPORT: f2fs: sanity check log_blocks_per_seg

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f2fs currently only supports 4KB block size and 2MB segment size.
Sanity check log_blocks_per_seg == 9, i.e. 2MB/4KB = (1 << 9)

Partially
(cherry-picked from commit 9a59b62fd88196844cee5fff851bee2cfd7afb6e)

f2fs: do more integrity verification for superblock

Do more sanity check for superblock during ->mount.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Bug: 36817013
Change-Id: I0be52e54fba82083068337ceb9f7ad985a87319f
Signed-off-by: Jin Qian <jinqian@google.com>
CVE-2017-0750
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
This commit is contained in:
Jin Qian
2019-08-06 12:29:56 +02:00
committed by Francescodario Cuzzocrea
parent 79667afde6
commit 3aa040ac74
1 changed files with 8 additions and 0 deletions
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fs/f2fs/super.c
+8
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@@ -1358,6 +1358,14 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
return 1;
}
/* check log blocks per segment */
if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
f2fs_msg(sb, KERN_INFO,
"Invalid log blocks per segment (%u)\n",
le32_to_cpu(raw_super->log_blocks_per_seg));
return 1;
}
/* Currently, support 512/1024/2048/4096 bytes sector size */
if (le32_to_cpu(raw_super->log_sectorsize) >
F2FS_MAX_LOG_SECTOR_SIZE ||