diff options
| author | Sachin Prabhu <sprabhu@redhat.com> | 2016-07-29 22:38:20 +0100 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2016-09-09 23:58:06 -0500 |
| commit | c1d8b24d18192764fe82067ec6aa8d4c3bf094e0 (patch) | |
| tree | 0347a017fef6d42bc5a47a5c708cc1e96112cc1b /fs | |
| parent | 4214ebf4654798309364d0c678b799e402f38288 (diff) | |
| download | linux-0-day-c1d8b24d18192764fe82067ec6aa8d4c3bf094e0.tar.gz linux-0-day-c1d8b24d18192764fe82067ec6aa8d4c3bf094e0.tar.xz | |
Compare prepaths when comparing superblocks
The patch
fs/cifs: make share unaccessible at root level mountable
makes use of prepaths when any component of the underlying path is
inaccessible.
When mounting 2 separate shares having different prepaths but are other
wise similar in other respects, we end up sharing superblocks when we
shouldn't be doing so.
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Tested-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cifs/connect.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 4546926680d4d..2e4f4bad8b1e9 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2781,6 +2781,24 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data) return 1; } +static int +match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data) +{ + struct cifs_sb_info *old = CIFS_SB(sb); + struct cifs_sb_info *new = mnt_data->cifs_sb; + + if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) { + if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)) + return 0; + /* The prepath should be null terminated strings */ + if (strcmp(new->prepath, old->prepath)) + return 0; + + return 1; + } + return 0; +} + int cifs_match_super(struct super_block *sb, void *data) { @@ -2808,7 +2826,8 @@ cifs_match_super(struct super_block *sb, void *data) if (!match_server(tcp_srv, volume_info) || !match_session(ses, volume_info) || - !match_tcon(tcon, volume_info->UNC)) { + !match_tcon(tcon, volume_info->UNC) || + !match_prepath(sb, mnt_data)) { rc = 0; goto out; } |