From 378831e4daec75fbba6d3612bcf3b4dd00ddbf08 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Wed, 16 May 2018 21:25:46 +0100
Subject: [PATCH] afs: Fix directory permissions check
Git-commit: 378831e4daec75fbba6d3612bcf3b4dd00ddbf08
Patch-mainline: v4.17
References: bsc#1101828

Doing faccessat("/afs/some/directory", 0) triggers a BUG in the permissions
check code.

Fix this by just removing the BUG section.  If no permissions are asked
for, just return okay if the file exists.

Also: 

 (1) Split up the directory check so that it has separate if-statements
     rather than if-else-if (e.g. checking for MAY_EXEC shouldn't skip the
     check for MAY_READ and MAY_WRITE).

 (2) Check for MAY_CHDIR as MAY_EXEC.

Without the main fix, the following BUG may occur:

 kernel BUG at fs/afs/security.c:386!
 invalid opcode: 0000 [#1] SMP PTI
 ...
 RIP: 0010:afs_permission+0x19d/0x1a0 [kafs]
 ...
 Call Trace:
  ? inode_permission+0xbe/0x180
  ? do_faccessat+0xdc/0x270
  ? do_syscall_64+0x60/0x1f0
  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe

Fixes: 00d3b7a4533e ("[AFS]: Add security support.")
Reported-by: Jonathan Billings <jsbillings@jsbillings.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/afs/security.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

--- a/fs/afs/security.c
+++ b/fs/afs/security.c
@@ -323,19 +323,15 @@ int afs_permission(struct inode *inode,
 	       mask, access, S_ISDIR(inode->i_mode) ? "dir" : "file");
 
 	if (S_ISDIR(inode->i_mode)) {
-		if (mask & MAY_EXEC) {
+		if (mask & (MAY_EXEC | MAY_READ | MAY_CHDIR)) {
 			if (!(access & AFS_ACE_LOOKUP))
 				goto permission_denied;
-		} else if (mask & MAY_READ) {
-			if (!(access & AFS_ACE_READ))
-				goto permission_denied;
-		} else if (mask & MAY_WRITE) {
+		}
+		if (mask & MAY_WRITE) {
 			if (!(access & (AFS_ACE_DELETE | /* rmdir, unlink, rename from */
 					AFS_ACE_INSERT | /* create, mkdir, symlink, rename to */
 					AFS_ACE_WRITE))) /* chmod */
 				goto permission_denied;
-		} else {
-			BUG();
 		}
 	} else {
 		if (!(access & AFS_ACE_LOOKUP))