From: Linus Torvalds <torvalds@linux-foundation.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Hugh Dickins <hugh@veritas.com>,
Al Viro <viro@ZenIV.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Joe Malicki <jmalicki@metacarta.com>,
Michael Itz <mitz@metacarta.com>,
Kenneth Baker <bakerk@metacarta.com>,
Chris Wright <chrisw@sous-sol.org>,
David Howells <dhowells@redhat.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Q: check_unsafe_exec() races (Was: [PATCH 2/4] fix setuid sometimes doesn't)
Date: Tue, 21 Apr 2009 10:35:58 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.00.0904211032191.2199@localhost.localdomain> (raw)
In-Reply-To: <20090421171530.GA12014@redhat.com>
On Tue, 21 Apr 2009, Oleg Nesterov wrote:
>
> OK, I agree, it doesn't really matter from latency/etc pov.
>
> But still I can't understand why it is better to take fs->lock under
> RCU lock. I mean, "fs->lock is the innermost lock" should not apply
> to rcu_read_lock(). Because the latter is a bit special, no?
Oh, I don't think it matters. If you want to put the RCU read-lock
innermost, that's fine by me. I just reacted to your latency argument as
not being very strong :)
All I personally want is a patch that everybody can agree on, and that
has sane semantics.
Linus
next prev parent reply other threads:[~2009-04-21 17:44 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-28 23:16 [PATCH 1/4] compat_do_execve should unshare_files Hugh Dickins
2009-03-28 23:20 ` [PATCH 2/4] fix setuid sometimes doesn't Hugh Dickins
2009-03-29 0:53 ` Q: check_unsafe_exec() races (Was: [PATCH 2/4] fix setuid sometimes doesn't) Oleg Nesterov
2009-03-29 4:10 ` Al Viro
2009-03-29 4:14 ` Al Viro
2009-03-29 4:52 ` Oleg Nesterov
2009-03-29 5:55 ` Al Viro
2009-03-29 6:01 ` Al Viro
2009-03-29 21:36 ` Oleg Nesterov
2009-03-29 22:20 ` Al Viro
2009-03-29 23:56 ` Oleg Nesterov
2009-03-30 0:03 ` Oleg Nesterov
2009-03-30 1:08 ` Al Viro
2009-03-30 1:13 ` Al Viro
2009-03-30 1:36 ` Oleg Nesterov
2009-03-30 1:40 ` Oleg Nesterov
2009-03-30 12:31 ` Al Viro
2009-03-30 14:32 ` Hugh Dickins
2009-03-31 6:16 ` Al Viro
2009-04-01 0:28 ` Hugh Dickins
2009-04-01 2:38 ` Al Viro
2009-04-01 3:03 ` Al Viro
2009-04-01 11:25 ` Hugh Dickins
2009-04-06 15:31 ` Oleg Nesterov
2009-04-19 16:30 ` Hugh Dickins
2009-04-21 16:10 ` Oleg Nesterov
2009-04-21 16:31 ` Linus Torvalds
2009-04-21 17:15 ` Oleg Nesterov
2009-04-21 17:35 ` Linus Torvalds [this message]
2009-04-21 19:39 ` Hugh Dickins
2009-04-23 23:01 ` [PATCH 1/2] do_execve() must not clear fs->in_exec if it was set by another thread Oleg Nesterov
2009-04-23 23:18 ` Roland McGrath
2009-04-23 23:31 ` Al Viro
2009-04-24 11:57 ` [PATCH 3/2] check_unsafe_exec: rcu_read_unlock Hugh Dickins
2009-04-24 14:34 ` Oleg Nesterov
2009-04-24 4:20 ` [PATCH 1/2] do_execve() must not clear fs->in_exec if it was set by another thread Hugh Dickins
2009-04-23 23:02 ` [PATCH 2/2] check_unsafe_exec: s/lock_task_sighand/rcu_read_lock/ Oleg Nesterov
2009-04-23 23:18 ` Roland McGrath
2009-04-24 4:29 ` Hugh Dickins
2009-04-01 11:18 ` Q: check_unsafe_exec() races (Was: [PATCH 2/4] fix setuid sometimes doesn't) Hugh Dickins
2009-04-06 15:51 ` Oleg Nesterov
2009-04-19 16:44 ` Hugh Dickins
2009-04-21 16:39 ` Oleg Nesterov
2009-03-30 23:45 ` Serge E. Hallyn
2009-03-31 6:19 ` Al Viro
2009-03-28 23:21 ` [PATCH 3/4] fix setuid sometimes wouldn't Hugh Dickins
2009-03-29 11:19 ` Alexey Dobriyan
2009-03-29 21:48 ` Oleg Nesterov
2009-03-29 22:37 ` Al Viro
2009-03-28 23:23 ` [PATCH 4/4] Annotate struct fs_struct's usage count restriction Hugh Dickins
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