linux-kernel - Re: [PATCH 1/3] fuse/dev: Fix unbalanced calls to kunmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAJfpegt7BRgnHZWR8TbgnXx7+Xey3CS98i1UUdjm4C2G1u6RGg@mail.gmail.com>
Date:	Fri, 18 Jul 2014 17:21:55 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	lxc-devel@...ts.linuxcontainers.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	"Michael H. Warfield" <mhw@...tsend.com>
Subject: Re: [PATCH 1/3] fuse/dev: Fix unbalanced calls to kunmap_atomic()
 during splice I/O

On Mon, Jul 14, 2014 at 9:18 PM, Seth Forshee
<seth.forshee@...onical.com> wrote:
> fuse_copy_finish() assumes that mapaddr in fuse_copy_state refers
> to a valid mapping if currbuf is non-NULL, but this isn't always
> true when moving pages for splice I/O. This results in an
> unbalanced call to kunmap_atomic() and thus an unbalanced
> decrement of the preempt count. Avoid this by checking that
> mapaddr is non-NULL before calling kunmap_atomic().

I guess this is obsoleted by:

  c55a01d360af  fuse: avoid scheduling while atomic

which moves the kmap/kunmap closer to the actual use of the mapping.

Can you please verify?

Thanks,
Miklos
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/