From: Eric Biggers ebiggers@google.com
stable inclusion from linux-4.19.207 commit 8377a6af62992a55b19da1c3ac2b0c0ecae7e5ec
--------------------------------
commit 461b43a8f92e68e96c4424b31e15f2b35f1bbfa9 upstream.
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: cbaf042a3cc6 ("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: Eric Biggers ebiggers@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- fs/f2fs/namei.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index e20a0f9e68455..edc80855974ac 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -1219,9 +1219,18 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry, return target; }
+static int f2fs_encrypted_symlink_getattr(const struct path *path, + struct kstat *stat, u32 request_mask, + unsigned int query_flags) +{ + f2fs_getattr(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, #ifdef CONFIG_F2FS_FS_XATTR .listxattr = f2fs_listxattr,