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authorAtte Heikkilä <atteh.mailbox@gmail.com>2022-09-28 00:57:21 +0300
committerSteve French <stfrench@microsoft.com>2022-10-05 09:15:44 +0300
commitdbab80e2071ad8c702e50dab43326608a127d27b (patch)
treea380652e4821b2f52af84ef4cb766768b18ae949 /fs/ksmbd
parent7c88c1e0ab1704bacb751341ee6431c3be34b834 (diff)
downloadlinux-dbab80e2071ad8c702e50dab43326608a127d27b.tar.xz
ksmbd: make utf-8 file name comparison work in __caseless_lookup()
Case-insensitive file name lookups with __caseless_lookup() use strncasecmp() for file name comparison. strncasecmp() assumes an ISO8859-1-compatible encoding, which is not the case here as UTF-8 is always used. As such, use of strncasecmp() here produces correct results only if both strings use characters in the ASCII range only. Fix this by using utf8_strncasecmp() if CONFIG_UNICODE is set. On failure or if CONFIG_UNICODE is not set, fallback to strncasecmp(). Also, as we are adding an include for `linux/unicode.h', include it in `fs/ksmbd/connection.h' as well since it should be explicit there. Signed-off-by: Atte Heikkilä <atteh.mailbox@gmail.com> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd')
-rw-r--r--fs/ksmbd/connection.h1
-rw-r--r--fs/ksmbd/vfs.c20
-rw-r--r--fs/ksmbd/vfs.h2
3 files changed, 20 insertions, 3 deletions
diff --git a/fs/ksmbd/connection.h b/fs/ksmbd/connection.h
index 41d96f5cef06..3643354a3fa7 100644
--- a/fs/ksmbd/connection.h
+++ b/fs/ksmbd/connection.h
@@ -14,6 +14,7 @@
#include <net/request_sock.h>
#include <linux/kthread.h>
#include <linux/nls.h>
+#include <linux/unicode.h>
#include "smb_common.h"
#include "ksmbd_work.h"
diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c
index 4fcf96a01c16..8d8af724df70 100644
--- a/fs/ksmbd/vfs.c
+++ b/fs/ksmbd/vfs.c
@@ -1145,12 +1145,23 @@ static int __caseless_lookup(struct dir_context *ctx, const char *name,
unsigned int d_type)
{
struct ksmbd_readdir_data *buf;
+ int cmp = -EINVAL;
buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
if (buf->used != namlen)
return 0;
- if (!strncasecmp((char *)buf->private, name, namlen)) {
+ if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
+ const struct qstr q_buf = {.name = buf->private,
+ .len = buf->used};
+ const struct qstr q_name = {.name = name,
+ .len = namlen};
+
+ cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
+ }
+ if (cmp < 0)
+ cmp = strncasecmp((char *)buf->private, name, namlen);
+ if (!cmp) {
memcpy((char *)buf->private, name, namlen);
buf->dirent_count = 1;
return -EEXIST;
@@ -1166,7 +1177,8 @@ static int __caseless_lookup(struct dir_context *ctx, const char *name,
*
* Return: 0 on success, otherwise error
*/
-static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name, size_t namelen)
+static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
+ size_t namelen, struct unicode_map *um)
{
int ret;
struct file *dfilp;
@@ -1176,6 +1188,7 @@ static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name, size_t na
.private = name,
.used = namelen,
.dirent_count = 0,
+ .um = um,
};
dfilp = dentry_open(dir, flags, current_cred());
@@ -1238,7 +1251,8 @@ int ksmbd_vfs_kern_path(struct ksmbd_work *work, char *name,
break;
err = ksmbd_vfs_lookup_in_dir(&parent, filename,
- filename_len);
+ filename_len,
+ work->conn->um);
path_put(&parent);
if (err)
goto out;
diff --git a/fs/ksmbd/vfs.h b/fs/ksmbd/vfs.h
index d7542a2dab52..593059ca8511 100644
--- a/fs/ksmbd/vfs.h
+++ b/fs/ksmbd/vfs.h
@@ -12,6 +12,7 @@
#include <linux/namei.h>
#include <uapi/linux/xattr.h>
#include <linux/posix_acl.h>
+#include <linux/unicode.h>
#include "smbacl.h"
#include "xattr.h"
@@ -60,6 +61,7 @@ struct ksmbd_readdir_data {
unsigned int used;
unsigned int dirent_count;
unsigned int file_attr;
+ struct unicode_map *um;
};
/* ksmbd kstat wrapper to get valid create time when reading dir entry */