linux-kernel - Re: b050de0f98 ("fs/binfmt_elf.c: free PT_INTERP filename ASAP"): BUG: KASAN: null-ptr-deref in allow_write

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Date:   Tue, 2 Apr 2019 09:17:10 -0700
From:   Nikitas Angelinas <nikitas.angelinas@...il.com>
To:     Mukesh Ojha <mojha@...eaurora.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     kernel test robot <lkp@...el.com>,
        Alexey Dobriyan <adobriyan@...il.com>, LKP <lkp@...org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: b050de0f98 ("fs/binfmt_elf.c: free PT_INTERP filename ASAP"):
 BUG: KASAN: null-ptr-deref in allow_write_access

On Tue, Apr 02, 2019 at 08:53:42PM +0530, Mukesh Ojha wrote:
> I think, this may fix the problem.
> 
> https://patchwork.kernel.org/patch/10878501/
> 
> 
> Thanks,
> Mukesh
> 
> On 4/2/2019 8:24 PM, kernel test robot wrote:
> > Greetings,
> > 
> > 0day kernel testing robot got the below dmesg and the first bad commit is
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > 
> > commit b050de0f986606011986698de504c0dbc12c40dc
> > Author:     Alexey Dobriyan <adobriyan@...il.com>
> > AuthorDate: Fri Mar 29 10:02:05 2019 +1100
> > Commit:     Stephen Rothwell <sfr@...b.auug.org.au>
> > CommitDate: Sat Mar 30 16:09:51 2019 +1100
> > 
> >      fs/binfmt_elf.c: free PT_INTERP filename ASAP
> >      There is no reason for PT_INTERP filename to linger till the end of
> >      the whole loading process.
> >      Link: http://lkml.kernel.org/r/20190314204953.GD18143@avx2
> >      Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> >      Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
> >      Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> >      Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > 
> > 46238614d8  fs/binfmt_elf.c: make scope of "pos" variable smaller
> > b050de0f98  fs/binfmt_elf.c: free PT_INTERP filename ASAP
> > 05d08e2995  Add linux-next specific files for 20190402
<snip>
> > 
> > ---
> > 0-DAY kernel test infrastructure                Open Source Technology Center
> > https://lists.01.org/pipermail/lkp                          Intel Corporation
> 

Hi,

Yes, it should.

Andrew seems to have added the patch to the -mm tree.


P.S. Apologies to individual recipients for the double-posting. I am resending
this as the previous mail was rejected from linux-kernel and linux-fsdevel due
to HTML content.



Cheers,
Nikitas