diff options
| author | Atte Heikkilä <atteh.mailbox@gmail.com> | 2022-09-28 00:57:21 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2022-10-05 09:15:44 +0300 |
| commit | dbab80e2071ad8c702e50dab43326608a127d27b (patch) | |
| tree | a380652e4821b2f52af84ef4cb766768b18ae949 /fs/ksmbd | |
| parent | 7c88c1e0ab1704bacb751341ee6431c3be34b834 (diff) | |
| download | linux-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.h | 1 | ||||
| -rw-r--r-- | fs/ksmbd/vfs.c | 20 | ||||
| -rw-r--r-- | fs/ksmbd/vfs.h | 2 |
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 */ |