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authorAl Viro <viro@zeniv.linux.org.uk>2008-07-16 17:51:03 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-07-27 04:53:19 +0400
commit8bb79224b87aab92071e94d46e70bd160d89bf34 (patch)
treedab47cbb434876e5916f18b738ef8bd3fe1e1ce1
parentdb2e747b14991a4c6a5c98b0e5f552a193237c03 (diff)
downloadlinux-8bb79224b87aab92071e94d46e70bd160d89bf34.tar.xz
[PATCH] permission checks for chdir need special treatment only on the last step
... so we ought to pass MAY_CHDIR to vfs_permission() instead of having it triggered on every step of preceding pathname resolution. LOOKUP_CHDIR is killed by that. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/namei.c2
-rw-r--r--fs/open.c5
-rw-r--r--include/linux/namei.h1
3 files changed, 2 insertions, 6 deletions
diff --git a/fs/namei.c b/fs/namei.c
index ae0e56fdb742..6c76e1ee9c45 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -268,8 +268,6 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
if (nd) {
if (nd->flags & LOOKUP_ACCESS)
extra |= MAY_ACCESS;
- if (nd->flags & LOOKUP_CHDIR)
- extra |= MAY_CHDIR;
if (nd->flags & LOOKUP_OPEN)
extra |= MAY_OPEN;
}
diff --git a/fs/open.c b/fs/open.c
index b2e4c93aed03..8e02d42bfe44 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -501,12 +501,11 @@ asmlinkage long sys_chdir(const char __user * filename)
struct nameidata nd;
int error;
- error = __user_walk(filename,
- LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
+ error = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &nd);
if (error)
goto out;
- error = vfs_permission(&nd, MAY_EXEC);
+ error = vfs_permission(&nd, MAY_EXEC | MAY_CHDIR);
if (error)
goto dput_and_out;
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 24d88e98a626..3cf62d26d493 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -55,7 +55,6 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
#define LOOKUP_OPEN (0x0100)
#define LOOKUP_CREATE (0x0200)
#define LOOKUP_ACCESS (0x0400)
-#define LOOKUP_CHDIR (0x0800)
extern int __user_walk(const char __user *, unsigned, struct nameidata *);
extern int __user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *);