linux-kernel - Re: KASAN: use-after-free Read in alloc

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Message-ID: <12b09710-ddc3-7948-b24e-487c514f028e@I-love.SAKURA.ne.jp>
Date:   Sat, 21 Apr 2018 19:43:18 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     syzbot+7a1cff37dbbef9e7ba4c@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com
Cc:     viro@...IV.linux.org.uk, akpm@...ux-foundation.org,
        dhowells@...hat.com, ebiederm@...ssion.com, ebiggers3@...il.com,
        gs051095@...il.com, ktkhai@...tuozzo.com,
        linux-kernel@...r.kernel.org, oleg@...hat.com,
        pasha.tatashin@...cle.com, riel@...hat.com,
        rppt@...ux.vnet.ibm.com, wangkefeng.wang@...wei.com
Subject: Re: KASAN: use-after-free Read in alloc_pid

On 2018/04/10 23:33, Tetsuo Handa wrote:
> syzbot wrote:
>> syzbot has found reproducer for the following crash on upstream commit
>> c18bb396d3d261ebbb4efbc05129c5d354c541e4 (Tue Apr 10 00:04:10 2018 +0000)
>> Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
>> syzbot dashboard link:  
>> https://syzkaller.appspot.com/bug?extid=7a1cff37dbbef9e7ba4c
>>
> While we are waiting for
> 
>   rpc_pipefs: fix double-dput()
>   rpc_pipefs: deal with early sget() failures
>   kernfs: deal with early sget() failures
>   procfs: deal with early sget() failures
>   orangefs_kill_sb(): deal with allocation failures
>   nfsd_umount(): deal with early sget() failures
>   nfs: avoid double-free on early sget() failures
>   jffs2_kill_sb(): deal with failed allocations
>   hypfs_kill_super(): deal with failed allocations
> 
> in https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git/log/?h=for-linus ,
> I think the patch at
> 
>   WARNING in kill_block_super
>   https://syzkaller.appspot.com/bug?id=588996a25a2587be2e3a54e8646728fb9cae44e7
> 
> is better.
> 

OK. The patch was sent to linux.git as commit 8e04944f0ea8b838.

#syz fix: mm,vmscan: Allow preallocating memory for register_shrinker().