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

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Message-ID: <8736zkbm3x.fsf@xmission.com>
Date:   Tue, 24 Apr 2018 11:33:22 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     syzbot+7a1cff37dbbef9e7ba4c@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com, viro@...IV.linux.org.uk,
        akpm@...ux-foundation.org, dhowells@...hat.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

Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> writes:

> 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().

Sigh no fixes tag on the commit you sent to Linus, and no
cc'ing of stable.

Can you please update the stable folks that 9ee332d99e4d ("sget():
handle failures of register_shrinker()") is fixed with the commit you
just sent to Linus?

Thank you,
Eric