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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-08-23 04:06:03 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-08-24 23:54:58 +0400
commita343bb7750e6a098909c34f5c5dfddbc4fa40053 (patch)
treef4125368b85270b4fd619ae317ce0796605c579e /fs/namei.c
parent16b4289c7460ba9c04af40c574949dcca9029658 (diff)
downloadlinux-a343bb7750e6a098909c34f5c5dfddbc4fa40053.tar.xz
VFS: Fix access("file", X_OK) in the presence of ACLs
Currently, the access() call will return incorrect information on NFS if there exists an ACL that grants execute access to the user on a regular file. The reason the information is incorrect is that the VFS overrides this execute access in open_exec() by checking (inode->i_mode & 0111). This patch propagates the VFS execute bit check back into the generic permission() call. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> (cherry picked from 64cbae98848c4c99851cb0a405f0b4982cd76c1e commit)
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 863166441bf3..432d6bc6fab0 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -227,10 +227,10 @@ int generic_permission(struct inode *inode, int mask,
int permission(struct inode *inode, int mask, struct nameidata *nd)
{
+ umode_t mode = inode->i_mode;
int retval, submask;
if (mask & MAY_WRITE) {
- umode_t mode = inode->i_mode;
/*
* Nobody gets write access to a read-only fs.
@@ -247,6 +247,13 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
}
+ /*
+ * MAY_EXEC on regular files requires special handling: We override
+ * filesystem execute permissions if the mode bits aren't set.
+ */
+ if ((mask & MAY_EXEC) && S_ISREG(mode) && !(mode & S_IXUGO))
+ return -EACCES;
+
/* Ordinary permission routines do not understand MAY_APPEND. */
submask = mask & ~MAY_APPEND;
if (inode->i_op && inode->i_op->permission)