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authorAurelien Aptel <aaptel@suse.com>2020-02-06 18:16:55 +0100
committerSteve French <stfrench@microsoft.com>2020-02-06 17:19:38 -0600
commite3e056c35108661e418c803adfc054bf683426e7 (patch)
tree3838d53d8bd718d1c6fb8dc12f7a60e1b107afa6 /fs/cifs
parentcifs: fix channel signing (diff)
downloadlinux-dev-e3e056c35108661e418c803adfc054bf683426e7.tar.xz
linux-dev-e3e056c35108661e418c803adfc054bf683426e7.zip
cifs: fix mode bits from dir listing when mounted with modefromsid
When mounting with -o modefromsid, the mode bits are stored in an ACE. Directory enumeration (e.g. ls -l /mnt) triggers an SMB Query Dir which does not include ACEs in its response. The mode bits in this case are silently set to a default value of 755 instead. This patch marks the dentry created during the directory enumeration as needing re-evaluation (i.e. additional Query Info with ACEs) so that the mode bits can be properly extracted. Quick repro: $ mount.cifs //win19.test/data /mnt -o ...,modefromsid $ touch /mnt/foo && chmod 751 /mnt/foo $ stat /mnt/foo # reports 751 (OK) $ sleep 2 # dentry older than 1s by default get invalidated $ ls -l /mnt # since dentry invalid, ls does a Query Dir # and reports foo as 755 (WRONG) Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/readdir.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index d17587c2c4ab..ba9dadf3be24 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -196,7 +196,8 @@ cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
* may look wrong since the inodes may not have timed out by the time
* "ls" does a stat() call on them.
*/
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
+ if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
+ (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID))
fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&