From: Cyrill Gorcunov <gorcunov@openvz.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Mark Salter <msalter@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Russell King <rmk@arm.linux.org.uk>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org,
Linux-Arch <linux-arch@vger.kernel.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Pavel Emelyanov <xemul@parallels.com>
Subject: Re: sys_kcmp
Date: Mon, 24 Sep 2012 22:51:19 +0400 [thread overview]
Message-ID: <20120924185119.GI16532@moon> (raw)
In-Reply-To: <87lifzuvey.fsf@xmission.com>
On Mon, Sep 24, 2012 at 11:29:09AM -0700, Eric W. Biederman wrote:
> >
> > +#ifdef CONFIG_MMU
> > if (addr >= TASK_SIZE || addr < mmap_min_addr)
> > +#else
> > + if (addr >= TASK_SIZE)
> > +#endif
>
> I expect what you want is a call to access_ok, rather than hard coding
> details about task layout here. This test certainly looks wrong
> for a 32bit process on a 64bit kernel. If I read your test right it
> appears I can set values of say 0x100000000 on a 32bit process...
>
> As for mmap_min_addr I would expect your find_vma check would make that
> test unnecessary, simply by not finding a vma...
Good point, Eric, thanks! I'm cooking a new patch now.
next prev parent reply other threads:[~2012-09-24 18:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-22 10:56 sys_kcmp (was: Re: [PATCH 1/2] ARM: add finit_module syscall to ARM) Geert Uytterhoeven
2012-09-22 10:56 ` Geert Uytterhoeven
2012-09-22 11:45 ` Cyrill Gorcunov
2012-09-22 13:20 ` Russell King
2012-09-22 13:20 ` Russell King
2012-09-22 13:38 ` Ralf Baechle
2012-09-22 15:37 ` Cyrill Gorcunov
2012-09-22 18:47 ` Andrew Morton
2012-09-24 16:21 ` Mark Salter
2012-09-24 16:21 ` Mark Salter
2012-09-24 16:49 ` Cyrill Gorcunov
2012-09-24 17:42 ` Cyrill Gorcunov
2012-09-24 18:16 ` Mark Salter
2012-09-24 18:55 ` Cyrill Gorcunov
2012-09-24 18:29 ` sys_kcmp Eric W. Biederman
2012-09-24 18:51 ` Cyrill Gorcunov [this message]
2012-09-24 20:35 ` sys_kcmp Cyrill Gorcunov
2012-09-24 20:35 ` sys_kcmp Cyrill Gorcunov
2012-09-24 20:44 ` sys_kcmp Eric W. Biederman
2012-09-24 20:53 ` sys_kcmp Cyrill Gorcunov
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