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authorSteve French <stfrench@microsoft.com>2019-06-24 10:01:42 +0300
committerSteve French <stfrench@microsoft.com>2019-07-08 06:37:43 +0300
commit412094a8fb0711e9f332bed6723aa59706a4ff7e (patch)
tree8c8bb1162dff355aa8c428adda25114eb845905f /fs/cifs
parentd5ecebc4900df7f6e8dff0717574668885110553 (diff)
downloadlinux-412094a8fb0711e9f332bed6723aa59706a4ff7e.tar.xz
smb3: add new mount option to retrieve mode from special ACE
There is a special ACE used by some servers to allow the mode bits to be stored. This can be especially helpful in scenarios in which the client is trusted, and access checking on the client vs the POSIX mode bits is sufficient. Add mount option to allow enabling this behavior. Follow on patch will add support for chmod and queryinfo (stat) by retrieving the POSIX mode bits from the special ACE, SID: S-1-5-88-3 See e.g. https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/hh509017(v=ws.10) Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifs_fs_sb.h1
-rw-r--r--fs/cifs/cifsfs.c2
-rw-r--r--fs/cifs/cifsglob.h3
-rw-r--r--fs/cifs/connect.c8
4 files changed, 12 insertions, 2 deletions
diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index afa56237a0c3..b326d2ca3765 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -52,6 +52,7 @@
#define CIFS_MOUNT_UID_FROM_ACL 0x2000000 /* try to get UID via special SID */
#define CIFS_MOUNT_NO_HANDLE_CACHE 0x4000000 /* disable caching dir handles */
#define CIFS_MOUNT_NO_DFS 0x8000000 /* disable DFS resolving */
+#define CIFS_MOUNT_MODE_FROM_SID 0x10000000 /* retrieve mode from special ACE */
struct cifs_sb_info {
struct rb_root tlink_tree;
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index dc5fd7a648f0..0ee63ac4ef72 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -526,6 +526,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
seq_puts(s, ",nobrl");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
seq_puts(s, ",nohandlecache");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
+ seq_puts(s, ",modefromsid");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
seq_puts(s, ",cifsacl");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 16f240911192..a4af850cd20a 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -550,6 +550,7 @@ struct smb_vol {
bool override_gid:1;
bool dynperm:1;
bool noperm:1;
+ bool mode_ace:1;
bool no_psx_acl:1; /* set if posix acl support should be disabled */
bool cifs_acl:1;
bool backupuid_specified; /* mount option backupuid is specified */
@@ -618,7 +619,7 @@ struct smb_vol {
CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
- CIFS_MOUNT_NO_DFS)
+ CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID)
/**
* Generic VFS superblock mount flags (s_flags) to consider when
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 1eb73149e6d4..07c9cd7637c5 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -96,7 +96,7 @@ enum {
Opt_multiuser, Opt_sloppy, Opt_nosharesock,
Opt_persistent, Opt_nopersistent,
Opt_resilient, Opt_noresilient,
- Opt_domainauto, Opt_rdma,
+ Opt_domainauto, Opt_rdma, Opt_modesid,
/* Mount options which take numeric value */
Opt_backupuid, Opt_backupgid, Opt_uid,
@@ -175,6 +175,7 @@ static const match_table_t cifs_mount_option_tokens = {
{ Opt_serverino, "serverino" },
{ Opt_noserverino, "noserverino" },
{ Opt_rwpidforward, "rwpidforward" },
+ { Opt_modesid, "modefromsid" },
{ Opt_cifsacl, "cifsacl" },
{ Opt_nocifsacl, "nocifsacl" },
{ Opt_acl, "acl" },
@@ -1830,6 +1831,9 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
case Opt_rwpidforward:
vol->rwpidforward = 1;
break;
+ case Opt_modesid:
+ vol->mode_ace = 1;
+ break;
case Opt_cifsacl:
vol->cifs_acl = 1;
break;
@@ -3976,6 +3980,8 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
if (pvolume_info->rwpidforward)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
+ if (pvolume_info->mode_ace)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID;
if (pvolume_info->cifs_acl)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
if (pvolume_info->backupuid_specified) {