linux-kernel - Re: [syzbot] general protection fault in binder_alloc_new_buf

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Date:   Fri, 2 Sep 2022 15:53:23 +0000
From:   Carlos Llamas <cmllamas@...gle.com>
To:     syzbot <syzbot+ff47834028a51cf6f857@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, arve@...roid.com, brauner@...nel.org,
        gregkh@...uxfoundation.org, joel@...lfernandes.org,
        liam.howlett@...cle.com, linux-kernel@...r.kernel.org,
        maco@...roid.com, omosnace@...hat.com, surenb@...gle.com,
        syzkaller-bugs@...glegroups.com, tkjos@...roid.com
Subject: Re: [syzbot] general protection fault in binder_alloc_new_buf_locked

On Fri, Sep 02, 2022 at 07:42:36AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    b90cb1053190 Linux 6.0-rc3
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1719e383080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9c5c41fc03fda66f
> dashboard link: https://syzkaller.appspot.com/bug?extid=ff47834028a51cf6f857
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11794975080000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1445c063080000
> 
> The issue was bisected to:
> 
> commit 44e602b4e52f70f04620bbbf4fe46ecb40170bde
> Author: Liam Howlett <liam.howlett@...cle.com>
> Date:   Wed Aug 10 16:02:25 2022 +0000
> 
>     binder_alloc: add missing mmap_lock calls when using the VMA
> 

Duplicate report, this time bisection worked though.

#syz dup: general protection fault in binder_alloc_new_buf