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Message-ID: <20200328225436.m3f72nutyq352i2w@comp-core-i7-2640m-0182e6>
Date: Sat, 28 Mar 2020 23:54:36 +0100
From: Alexey Gladkov <gladkov.alexey@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux API <linux-api@...r.kernel.org>,
Linux FS Devel <linux-fsdevel@...r.kernel.org>,
Linux Security Module <linux-security-module@...r.kernel.org>,
Akinobu Mita <akinobu.mita@...il.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Alexey Dobriyan <adobriyan@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
Daniel Micay <danielmicay@...il.com>,
Djalal Harouni <tixxdz@...il.com>,
"Dmitry V . Levin" <ldv@...linux.org>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Ingo Molnar <mingo@...nel.org>,
"J . Bruce Fields" <bfields@...ldses.org>,
Jeff Layton <jlayton@...chiereds.net>,
Jonathan Corbet <corbet@....net>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v10 8/9] proc: use human-readable values for hidehid
On Sat, Mar 28, 2020 at 02:52:55PM -0700, Kees Cook wrote:
> On Sat, Mar 28, 2020 at 10:14:53PM +0100, Alexey Gladkov wrote:
> > On Sat, Mar 28, 2020 at 01:28:28PM -0700, Kees Cook wrote:
> > > On Fri, Mar 27, 2020 at 06:23:30PM +0100, Alexey Gladkov wrote:
> > > > [...]
> > > > + if (!kstrtouint(param->string, base, &result.uint_32)) {
> > > > + ctx->hidepid = result.uint_32;
> > >
> > > This need to bounds-check the value with a call to valid_hidepid(), yes?
> >
> > The kstrtouint returns 0 on success and -ERANGE on overflow [1].
>
> No, I mean, hidepid cannot be just any uint32 value. It must be in the
> enum. Is that checked somewhere else? It looked like the call to
> valid_hidepid() was removed.
The valid_hidepid() is called after parsing the hidepid parameter value.
Yes, it can be called inside this condition.
--
Rgrds, legion
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