Re: KASAN: use-after-free Read in alloc_pid

[Tetsuo Handa]

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().