linux-kernel - Re: [syzbot] [net?] KASAN: slab-use-after-free Read in unix_stream_read

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Message-ID: <15a6ed05-8f11-4118-ae32-4cb7622ce19b@oracle.com>
Date: Thu, 5 Sep 2024 12:06:53 -0700
From: Shoaib Rao <rao.shoaib@...cle.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: syzbot <syzbot+8811381d455e3e9ec788@...kaller.appspotmail.com>,
        davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Read in
 unix_stream_read_actor (2)


On 9/5/2024 1:04 AM, Eric Dumazet wrote:
> On Thu, Sep 5, 2024 at 9:35 AM Shoaib Rao <rao.shoaib@...cle.com> wrote:
>> Hi All,
>>
>> I am not able to reproduce the issue. I have run the C program at least
>> 100 times in a loop. In the I do get an EFAULT, not sure if that is
>> intentional or not but no panic. Should I be doing something
>> differently? The kernel version I am using is
>> v6.11-rc6-70-gc763c4339688. Later I can try with the exact version.
>
> Have you selected ASAN in your kernel build ?
>
> CONFIG_KASAN=y
> CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX=y
> CONFIG_KASAN_GENERIC=y
> CONFIG_KASAN_INLINE=y
> CONFIG_KASAN_STACK=y
> CONFIG_KASAN_VMALLOC=y
>
>> [rshoaib@...bo-2 debug_pnic]$ gcc cause_panic.c -o panic_sys
>> [rshoaib@...bo-2 debug_pnic]$ strace -f ./panic_sys
>> execve("./panic_sys", ["./panic_sys"], 0x7ffe7d271d38 /* 63 vars */) = 0
>> brk(NULL)                               = 0x18104000

Hi Eric,

Yes. The config is

[rshoaib@...bo-2 ~]$ grep KASAN /boot/config-`uname -r`
++ uname -r
+ grep --color=auto KASAN /boot/config-6.11.0-rao-rc6-gc763c4339688-dirty
CONFIG_KASAN_SHADOW_OFFSET=0xdffffc0000000000
CONFIG_HAVE_ARCH_KASAN=y
CONFIG_HAVE_ARCH_KASAN_VMALLOC=y
CONFIG_CC_HAS_KASAN_GENERIC=y
CONFIG_KASAN=y
CONFIG_KASAN_GENERIC=y
# CONFIG_KASAN_OUTLINE is not set
CONFIG_KASAN_INLINE=y
CONFIG_KASAN_STACK=y
CONFIG_KASAN_VMALLOC=y

The only config missing is

CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX

I do not have that option.

Shoaib