[PATCH 5.13 110/113] ubifs: report correct st_size for encrypted symlinks
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-09-01 12:55:31
Also in:
lkml
From: Eric Biggers <redacted>
commit 064c734986011390b4d111f1a99372b7f26c3850 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 ubifs_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: ca7f85be8d6c ("ubifs: Add support for encrypted symlinks")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-5-ebiggers@kernel.org (local)
Signed-off-by: Eric Biggers <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/ubifs/file.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c@@ -1630,6 +1630,17 @@ static const char *ubifs_get_link(struct return fscrypt_get_symlink(inode, ui->data, ui->data_len, done); } +static int ubifs_symlink_getattr(struct user_namespace *mnt_userns, + const struct path *path, struct kstat *stat, + u32 request_mask, unsigned int query_flags) +{ + ubifs_getattr(mnt_userns, path, stat, request_mask, query_flags); + + if (IS_ENCRYPTED(d_inode(path->dentry))) + return fscrypt_symlink_getattr(path, stat); + return 0; +} + const struct address_space_operations ubifs_file_address_operations = { .readpage = ubifs_readpage, .writepage = ubifs_writepage,
@@ -1655,7 +1666,7 @@ const struct inode_operations ubifs_file const struct inode_operations ubifs_symlink_inode_operations = { .get_link = ubifs_get_link, .setattr = ubifs_setattr, - .getattr = ubifs_getattr, + .getattr = ubifs_symlink_getattr, .listxattr = ubifs_listxattr, .update_time = ubifs_update_time, };