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ubifs: report correct st_size for encrypted symlinks

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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: ca7f85be8d ("ubifs: Add support for encrypted symlinks")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-5-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Biggers 2021-09-01 09:27:21 -07:00 committed by AuxXxilium
parent d6675f69f0
commit 9e3c779cbb
1 changed files with 11 additions and 1 deletions
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12
fs/ubifs/file.c
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@ -1629,6 +1629,16 @@ static const char *ubifs_get_link(struct dentry *dentry,
return fscrypt_get_symlink(inode, ui->data, ui->data_len, done); return fscrypt_get_symlink(inode, ui->data, ui->data_len, done);
} }
static int ubifs_symlink_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
ubifs_getattr(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 = { const struct address_space_operations ubifs_file_address_operations = {
.readpage = ubifs_readpage, .readpage = ubifs_readpage,
.writepage = ubifs_writepage, .writepage = ubifs_writepage,
@ -1654,7 +1664,7 @@ const struct inode_operations ubifs_file_inode_operations = {
const struct inode_operations ubifs_symlink_inode_operations = { const struct inode_operations ubifs_symlink_inode_operations = {
.get_link = ubifs_get_link, .get_link = ubifs_get_link,
.setattr = ubifs_setattr, .setattr = ubifs_setattr,
.getattr = ubifs_getattr, .getattr = ubifs_symlink_getattr,
#ifdef CONFIG_UBIFS_FS_XATTR #ifdef CONFIG_UBIFS_FS_XATTR
.listxattr = ubifs_listxattr, .listxattr = ubifs_listxattr,
#endif #endif