Re: [PATCH] vfs: fix linkat error for unprivileged AT_EMPTY_PATH

From: Al Viro
Date: Wed Sep 24 2014 - 15:01:06 EST

On Wed, Sep 24, 2014 at 05:25:23PM +0200, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@xxxxxxx>
> Return proper error value for linkat(..., AT_EMPTY_PATH) without enough
> privileges.
> I guess ENOENT was used here, because without AT_EMPTY_PATH that's what
> we'd return for an empty path. But it is wrong for AT_EMPTY_PATH, since we
> might not even be passing an empty path, we are simply complaining about
> lack of privs for which EPERM is the proper error.

Umm... Are you sure that nothing in userland is checking for that
return value? I agree that EPERM would make more sense, but...
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