In the "operation does permission checking" model used by fuse, chdir
permission is not checked, since there's no chdir method.
For this case set a lookup flag, which will be passed to
->permission(), so fuse can distinguish it from permission checks for
other operations.
Signed-off-by: Miklos Szeredi <miklos@xxxxxxxxxx>
---
Index: linux/fs/fuse/dir.c
===================================================================
--- linux.orig/fs/fuse/dir.c 2006-07-27 14:38:04.000000000 +0200
+++ linux/fs/fuse/dir.c 2006-07-27 14:38:15.000000000 +0200
@@ -776,7 +776,7 @@ static int fuse_permission(struct inode
if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
return -EACCES;
- if (nd && (nd->flags & LOOKUP_ACCESS))
+ if (nd && (nd->flags & (LOOKUP_ACCESS | LOOKUP_CHDIR)))
return fuse_access(inode, mask);
return 0;
}
Index: linux/fs/open.c
===================================================================
--- linux.orig/fs/open.c 2006-07-27 14:35:14.000000000 +0200
+++ linux/fs/open.c 2006-07-27 14:38:15.000000000 +0200
@@ -546,7 +546,8 @@ asmlinkage long sys_chdir(const char __u
struct nameidata nd;
int error;
- error = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &nd);
+ error = __user_walk(filename,
+ LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
if (error)
goto out;
Index: linux/include/linux/namei.h
===================================================================
--- linux.orig/include/linux/namei.h 2006-07-27 14:35:14.000000000 +0200
+++ linux/include/linux/namei.h 2006-07-27 14:38:15.000000000 +0200
@@ -54,6 +54,7 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LA
#define LOOKUP_OPEN (0x0100)
#define LOOKUP_CREATE (0x0200)
#define LOOKUP_ACCESS (0x0400)
+#define LOOKUP_CHDIR (0x0800)
extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));
-
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