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fs: Create a generic is_dot_dotdot() utility

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commit 42c3732fa8 upstream.

De-duplicate the same functionality in several places by hoisting
the is_dot_dotdot() utility function into linux/fs.h.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chuck Lever 2023-12-30 19:46:00 -05:00 committed by Greg Kroah-Hartman
parent 3322fa8f2a
commit 12aea49495
5 changed files with 14 additions and 32 deletions
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8
fs/crypto/fname.c
View File

@ -74,13 +74,7 @@ struct fscrypt_nokey_name {
static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
{
if (str->len == 1 && str->name[0] == '.')
return true;
if (str->len == 2 && str->name[0] == '.' && str->name[1] == '.')
return true;
return false;
return is_dot_dotdot(str->name, str->len);
}
/**

10
fs/ecryptfs/crypto.c
View File

@ -1973,16 +1973,6 @@ int ecryptfs_encrypt_and_encode_filename(
return rc;
}
static bool is_dot_dotdot(const char *name, size_t name_size)
{
if (name_size == 1 && name[0] == '.')
return true;
else if (name_size == 2 && name[0] == '.' && name[1] == '.')
return true;
return false;
}
/**
* ecryptfs_decode_and_decrypt_filename - converts the encoded cipher text name to decoded plaintext
* @plaintext_name: The plaintext name

11
fs/f2fs/f2fs.h
View File

@ -3335,17 +3335,6 @@ static inline bool f2fs_cp_error(struct f2fs_sb_info *sbi)
return is_set_ckpt_flags(sbi, CP_ERROR_FLAG);
}
static inline bool is_dot_dotdot(const u8 *name, size_t len)
{
if (len == 1 && name[0] == '.')
return true;
if (len == 2 && name[0] == '.' && name[1] == '.')
return true;
return false;
}
static inline void *f2fs_kmalloc(struct f2fs_sb_info *sbi,
size_t size, gfp_t flags)
{

6
fs/namei.c
View File

@ -2663,10 +2663,8 @@ static int lookup_one_common(struct user_namespace *mnt_userns,
if (!len)
return -EACCES;
if (unlikely(name[0] == '.')) {
if (len < 2 || (len == 2 && name[1] == '.'))
return -EACCES;
}
if (is_dot_dotdot(name, len))
return -EACCES;
while (len--) {
unsigned int c = *(const unsigned char *)name++;

11
include/linux/fs.h
View File

@ -3107,6 +3107,17 @@ extern bool path_is_under(const struct path *, const struct path *);
extern char *file_path(struct file *, char *, int);
/**
* is_dot_dotdot - returns true only if @name is "." or ".."
* @name: file name to check
* @len: length of file name, in bytes
*/
static inline bool is_dot_dotdot(const char *name, size_t len)
{
return len && unlikely(name[0] == '.') &&
(len == 1 || (len == 2 && name[1] == '.'));
}
#include <linux/err.h>
/* needed for stackable file system support */