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ntfs: add check for mft record size in superblock 

Number of bytes allocated for mft record should be equal to the mft record
size stored in ntfs superblock as reported by syzbot, userspace might
trigger out-of-bounds read by dereferencing ctx->attr in ntfs_attr_find()

Reported-by: syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com
Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com
Acked-by: Anton Altaparmakov <anton@tuxera.com>
Link: https://syzkaller.appspot.com/bug?extid=aed06913f36eff9b544e
Link: https://lkml.kernel.org/r/20200824022804.226242-1-rkovhaev@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rustam Kovhaev 2020-10-13 16:48:17 -07:00 committed by Linus Torvalds
parent d72e720a19
commit 4f8c94022f
1 changed files with 6 additions and 0 deletions
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6
fs/ntfs/inode.c
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@ -1810,6 +1810,12 @@ int ntfs_read_inode_mount(struct inode *vi)
brelse(bh);
}
if (le32_to_cpu(m->bytes_allocated) != vol->mft_record_size) {
ntfs_error(sb, "Incorrect mft record size %u in superblock, should be %u.",
le32_to_cpu(m->bytes_allocated), vol->mft_record_size);
goto err_out;
}
/* Apply the mst fixups. */
if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) {
/* FIXME: Try to use the $MFTMirr now. */