[v2,2/2] cifs: modefromsid: write mode ACE with DENY first

Commit Message

Aurélien Aptel Sept. 16, 2019, 7:09 p.m. UTC

DACL should start with denying ACE first but we are putting it at the
end. reorder them to put it first.

Signed-off-by: Aurelien Aptel <[e-mail]>
Signed-off-by: Steve French <[e-mail]>
---
 fs/cifs/cifsacl.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

Patch

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 3e0c5ed9ca20..5cde4ec5534e 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -809,18 +809,11 @@  static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
 			struct cifs_sid *pgrpsid, __u64 nmode, bool modefromsid)
 {
 	u16 size = 0;
+	u32 num_aces = 0;
 	struct cifs_acl *pnndacl;
 
 	pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl));
 
-	size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size),
-					pownersid, nmode, S_IRWXU);
-	size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
-					pgrpsid, nmode, S_IRWXG);
-	size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
-					 &sid_everyone, nmode, S_IRWXO);
-
-	/* TBD: Move this ACE to the top of ACE list instead of bottom */
 	if (modefromsid) {
 		struct cifs_ace *pntace =
 			(struct cifs_ace *)((char *)pnndacl + size);
@@ -828,11 +821,9 @@  static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
 
 		pntace->type = ACCESS_DENIED;
 		pntace->flags = 0x0;
+		pntace->access_req = 0;
 		pntace->sid.num_subauth = 3;
 		pntace->sid.revision = 1;
-		/* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4) */
-		pntace->size = cpu_to_le16(28);
-		size += 28;
 		for (i = 0; i < NUM_AUTHS; i++)
 			pntace->sid.authority[i] =
 				sid_unix_NFS_mode.authority[i];
@@ -840,12 +831,23 @@  static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
 		pntace->sid.sub_auth[1] = sid_unix_NFS_mode.sub_auth[1];
 		pntace->sid.sub_auth[2] = cpu_to_le32(nmode & 07777);
 
-		pndacl->num_aces = cpu_to_le32(4);
-		size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
-					 &sid_unix_NFS_mode, nmode, S_IRWXO);
-	} else
-		pndacl->num_aces = cpu_to_le32(3);
+		/* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */
+		pntace->size = cpu_to_le16(28);
+		size += 28;
+		num_aces++;
+	}
+
+	size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size),
+					pownersid, nmode, S_IRWXU);
+	num_aces++;
+	size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
+					pgrpsid, nmode, S_IRWXG);
+	num_aces++;
+	size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
+					 &sid_everyone, nmode, S_IRWXO);
+	num_aces++;
 
+	pndacl->num_aces = cpu_to_le32(num_aces);
 	pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl));
 
 	return 0;