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authorEric Biggers <ebiggers@google.com>2020-01-20 14:31:59 -0800
committerEric Biggers <ebiggers@google.com>2020-01-22 14:49:56 -0800
commitf0d07a98a070bb5e443df19c3aa55693cbca9341 (patch)
tree6ee18e57ea46e15f22d368ab3ed626ce23059502 /fs/ubifs
parentf592efe735a29c764e0d473307dab0f59665f02b (diff)
downloadlinux-f0d07a98a070bb5e443df19c3aa55693cbca9341.tar.bz2
ubifs: don't trigger assertion on invalid no-key filename
If userspace provides an invalid fscrypt no-key filename which encodes a hash value with any of the UBIFS node type bits set (i.e. the high 3 bits), gracefully report ENOENT rather than triggering ubifs_assert(). Test case with kvm-xfstests shell: . fs/ubifs/config . ~/xfstests/common/encrypt dev=$(__blkdev_to_ubi_volume /dev/vdc) ubiupdatevol $dev -t mount $dev /mnt -t ubifs mkdir /mnt/edir xfs_io -c set_encpolicy /mnt/edir rm /mnt/edir/_,,,,,DAAAAAAAAAAAAAAAAAAAAAAAAAA With the bug, the following assertion fails on the 'rm' command: [ 19.066048] UBIFS error (ubi0:0 pid 379): ubifs_assert_failed: UBIFS assert failed: !(hash & ~UBIFS_S_KEY_HASH_MASK), in fs/ubifs/key.h:170 Fixes: f4f61d2cc6d8 ("ubifs: Implement encrypted filenames") Cc: <stable@vger.kernel.org> # v4.10+ Link: https://lore.kernel.org/r/20200120223201.241390-5-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/ubifs')
-rw-r--r--fs/ubifs/dir.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 636c3222c230..5f937226976a 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -228,6 +228,8 @@ static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
if (nm.hash) {
ubifs_assert(c, fname_len(&nm) == 0);
ubifs_assert(c, fname_name(&nm) == NULL);
+ if (nm.hash & ~UBIFS_S_KEY_HASH_MASK)
+ goto done; /* ENOENT */
dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
} else {