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| author | Eric Biggers <ebiggers@google.com> | 2021-07-01 23:53:47 -0700 |
|---|---|---|
| committer | Eric Biggers <ebiggers@google.com> | 2021-07-25 20:01:06 -0700 |
| commit | 8c4bca10ceafc43b1ca0a9fab5fa27e13cbce99e (patch) | |
| tree | 673b214cfd740e892bbf0cd55f592a6109eb2bf3 /fs/ext4 | |
| parent | d18760560593e5af921f51a8c9b64b6109d634c2 (diff) | |
| download | linux-8c4bca10ceafc43b1ca0a9fab5fa27e13cbce99e.tar.bz2 | |
ext4: report correct st_size for encrypted symlinks
The stat() family of syscalls report the wrong size for encrypted
symlinks, which has caused breakage in several userspace programs.
Fix this by calling fscrypt_symlink_getattr() after ext4_getattr() for
encrypted symlinks. This function computes the correct size by reading
and decrypting the symlink target (if it's not already cached).
For more details, see the commit which added fscrypt_symlink_getattr().
Fixes: f348c252320b ("ext4 crypto: add symlink encryption")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/symlink.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c index dd05af983092..69109746e6e2 100644 --- a/fs/ext4/symlink.c +++ b/fs/ext4/symlink.c @@ -52,10 +52,20 @@ static const char *ext4_encrypted_get_link(struct dentry *dentry, return paddr; } +static int ext4_encrypted_symlink_getattr(struct user_namespace *mnt_userns, + const struct path *path, + struct kstat *stat, u32 request_mask, + unsigned int query_flags) +{ + ext4_getattr(mnt_userns, path, stat, request_mask, query_flags); + + return fscrypt_symlink_getattr(path, stat); +} + const struct inode_operations ext4_encrypted_symlink_inode_operations = { .get_link = ext4_encrypted_get_link, .setattr = ext4_setattr, - .getattr = ext4_getattr, + .getattr = ext4_encrypted_symlink_getattr, .listxattr = ext4_listxattr, }; |