linux-kernel - Re: general protection fault in tomoyo_check

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Message-ID: <fcbc5905-e507-6002-f5b2-95335c3d0083@i-love.sakura.ne.jp>
Date:   Tue, 26 May 2020 21:58:29 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     syzbot <syzbot+cff8c4c75acd8c6fb842@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com
Cc:     jmorris@...ei.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, serge@...lyn.com
Subject: Re: general protection fault in tomoyo_check_acl

On 2020/05/26 12:46, syzbot wrote:
> general protection fault, probably for non-canonical address 0xe000026660000003: 0000 [#1] PREEMPT SMP KASAN
> KASAN: probably user-memory-access in range [0x0000333300000018-0x000033330000001f]
> CPU: 0 PID: 12489 Comm: systemd-rfkill Not tainted 5.7.0-rc6-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:tomoyo_check_acl+0xa9/0x3e0 security/tomoyo/domain.c:173

struct tomoyo_acl_info *ptr == 0x0000333300000000 is strange; such pointer
can't be linked into standard doubly linked list using list_add_tail_rcu().
Thus, this report would to be an victim of memory corruption.