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author | Gabriel Krisman Bertazi <krisman@suse.de> | 2024-02-21 20:14:03 +0300 |
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committer | Sasha Levin <sashal@kernel.org> | 2024-03-27 01:17:59 +0300 |
commit | db6be34474de4acc683fb3b40b0224f17206eb8f (patch) | |
tree | 27975c8abe6a968660f1446eac4a556ec48a21be /lib/kunit/executor_test.c | |
parent | fe7670ede9aa69cd300a0daa584d493141efdc18 (diff) | |
download | linux-db6be34474de4acc683fb3b40b0224f17206eb8f.tar.xz |
ovl: Always reject mounting over case-insensitive directories
[ Upstream commit 2824083db76cb9d4b7910607b367e93b02912865 ]
overlayfs relies on the filesystem setting DCACHE_OP_HASH or
DCACHE_OP_COMPARE to reject mounting over case-insensitive directories.
Since commit bb9cd9106b22 ("fscrypt: Have filesystems handle their
d_ops"), we set ->d_op through a hook in ->d_lookup, which
means the root dentry won't have them, causing the mount to accidentally
succeed.
In v6.7-rc7, the following sequence will succeed to mount, but any
dentry other than the root dentry will be a "weird" dentry to ovl and
fail with EREMOTE.
mkfs.ext4 -O casefold lower.img
mount -O loop lower.img lower
mount -t overlay -o lowerdir=lower,upperdir=upper,workdir=work ovl /mnt
Mounting on a subdirectory fails, as expected, because DCACHE_OP_HASH
and DCACHE_OP_COMPARE are properly set by ->lookup.
Fix by explicitly rejecting superblocks that allow case-insensitive
dentries. Yes, this will be solved when we move d_op configuration back
to ->s_d_op. Yet, we better have an explicit fix to avoid messing up
again.
While there, re-sort the entries to have more descriptive error messages
first.
Fixes: bb9cd9106b22 ("fscrypt: Have filesystems handle their d_ops")
Acked-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240221171412.10710-2-krisman@suse.de
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib/kunit/executor_test.c')
0 files changed, 0 insertions, 0 deletions