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

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Message-Id: <201804102333.BCC87582.MFHFOQFOOJLVtS@I-love.SAKURA.ne.jp>
Date:   Tue, 10 Apr 2018 23:33:41 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     viro@...IV.linux.org.uk
Cc:     syzbot+7a1cff37dbbef9e7ba4c@...kaller.appspotmail.com,
        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, syzkaller-bugs@...glegroups.com,
        wangkefeng.wang@...wei.com
Subject: Re: KASAN: use-after-free Read in alloc_pid

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.