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Message-ID: <20190712120743.mka3vl5t4zndc5wj@yavin>
Date: Fri, 12 Jul 2019 22:07:43 +1000
From: Aleksa Sarai <cyphar@...har.com>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: Jeff Layton <jlayton@...nel.org>,
"J. Bruce Fields" <bfields@...ldses.org>,
Arnd Bergmann <arnd@...db.de>,
David Howells <dhowells@...hat.com>,
Shuah Khan <shuah@...nel.org>,
Shuah Khan <skhan@...uxfoundation.org>,
Eric Biederman <ebiederm@...ssion.com>,
Andy Lutomirski <luto@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Alexei Starovoitov <ast@...nel.org>,
Kees Cook <keescook@...omium.org>,
Jann Horn <jannh@...gle.com>,
Christian Brauner <christian@...uner.io>,
Tycho Andersen <tycho@...ho.ws>,
David Drysdale <drysdale@...gle.com>,
Chanho Min <chanho.min@....com>,
Oleg Nesterov <oleg@...hat.com>, Aleksa Sarai <asarai@...e.de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
containers@...ts.linux-foundation.org, linux-alpha@...r.kernel.org,
linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
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Subject: Re: [PATCH v9 04/10] namei: split out nd->dfd handling to
dirfd_path_init
On 2019-07-12, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Sun, Jul 07, 2019 at 12:57:31AM +1000, Aleksa Sarai wrote:
> > Previously, path_init's handling of *at(dfd, ...) was only done once,
> > but with LOOKUP_BENEATH (and LOOKUP_IN_ROOT) we have to parse the
> > initial nd->path at different times (before or after absolute path
> > handling) depending on whether we have been asked to scope resolution
> > within a root.
>
> > if (*s == '/') {
> > - set_root(nd);
> > - if (likely(!nd_jump_root(nd)))
> > - return s;
> > - return ERR_PTR(-ECHILD);
>
> > + if (likely(!nd->root.mnt))
> > + set_root(nd);
>
> How can we get there with non-NULL nd->root.mnt, when LOOKUP_ROOT case
> has been already handled by that point?
Yup, you're completely right. I will remove the
if (!nd->root.mnt)
in the next version.
--
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>
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