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[PATCH] vfs: define new lookup flag for chdir

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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@szeredi.hu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi 2006-09-29 01:59:35 -07:00 committed by Linus Torvalds
parent 5b35e8e58a
commit 650a898342
3 changed files with 4 additions and 2 deletions
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2
fs/fuse/dir.c
View file

@ -776,7 +776,7 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
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;
}

3
fs/open.c
View file

@ -546,7 +546,8 @@ asmlinkage long sys_chdir(const char __user * filename)
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;

1
include/linux/namei.h
View file

@ -54,6 +54,7 @@ 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 FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));