Commit 461b43a8 authored by Eric Biggers's avatar Eric Biggers
Browse files

f2fs: 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 f2fs_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: cbaf042a ("f2fs crypto: add symlink encryption")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-4-ebiggers@kernel.org

Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
parent 8c4bca10
......@@ -1323,9 +1323,19 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
return target;
}
static int f2fs_encrypted_symlink_getattr(struct user_namespace *mnt_userns,
const struct path *path,
struct kstat *stat, u32 request_mask,
unsigned int query_flags)
{
f2fs_getattr(mnt_userns, path, stat, request_mask, query_flags);
return fscrypt_symlink_getattr(path, stat);
}
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
.get_link = f2fs_encrypted_get_link,
.getattr = f2fs_getattr,
.getattr = f2fs_encrypted_symlink_getattr,
.setattr = f2fs_setattr,
.listxattr = f2fs_listxattr,
};
......
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