[PATCH -V5 11/24] vfs: Make acl_permission_check() work for richacls

[Aneesh Kumar K.V]

From: Andreas Gruenbacher <agruen@xxxxxxx>

Signed-off-by: Andreas Gruenbacher <agruen@xxxxxxx>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
 fs/namei.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 1b6dbc9..d7ff419 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -174,6 +174,20 @@ static int acl_permission_check(struct inode *inode, int mask, unsigned int flag
 {
 	umode_t			mode = inode->i_mode;
 
+	if (IS_RICHACL(inode)) {
+		int error = check_acl(inode, mask, flags);
+		if (error != -EAGAIN)
+			return error;
+		if (mask & (MAY_DELETE_SELF | MAY_TAKE_OWNERSHIP |
+			    MAY_CHMOD | MAY_SET_TIMES)) {
+			/*
+			 * The file permission bit cannot grant these
+			 * permissions.
+			 */
+			return -EACCES;
+		}
+	}
+
 	if (current_fsuid() == inode->i_uid)
 		mode >>= 6;
 	else {
-- 
1.7.1

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