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ext4: add more inode number paranoia checks
authorTheodore Ts'o <tytso@mit.edu>
Sun, 17 Jun 2018 04:41:14 +0000 (00:41 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Sun, 17 Jun 2018 04:41:14 +0000 (00:41 -0400)
commitc37e9e013469521d9adb932d17a1795c139b36db
treea7a39bc1259d9c8398817a5c7c05fcc87e8f6bb6tree | snapshot
parent8bc1379b82b8e809eef77a9fedbb75c6c297be19commit | diff
ext4: add more inode number paranoia checks

If there is a directory entry pointing to a system inode (such as a
journal inode), complain and declare the file system to be corrupted.

Also, if the superblock's first inode number field is too small,
refuse to mount the file system.

This addresses CVE-2018-10882.

https://bugzilla.kernel.org/show_bug.cgi?id=200069

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
fs/ext4/ext4.h diff | blob | history
fs/ext4/inode.c diff | blob | history
fs/ext4/super.c diff | blob | history
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