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

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Date:   Tue, 17 Oct 2023 21:16:38 +0100
From:   Dmitry Safonov <0x7f454c46@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, frederic@...nel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de,
        syzbot <syzbot+3908cdfd655fd839c82f@...kaller.appspotmail.com>
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in
 reweight_entity

On 10/17/23 20:07, Peter Zijlstra wrote:
> On Tue, Oct 17, 2023 at 07:58:56PM +0100, Dmitry Safonov wrote:
>> FWIW,
>> Managed to locally reproduce it twice on 58720809f527 (tag: v6.6-rc6)
>> Linux 6.6-rc6 + TCP-AO patches on the top.
>> (but can't reproduce reliably at will)
>>
>> [dima@...dolluin linux-tcp-ao]$ ./scripts/faddr2line vmlinux
>> reweight_entity+0x3b0/0x490
>> reweight_entity+0x3b0/0x490:
> 
> Could you please try:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=sched/urgent&id=a3b75dce9d9ae4510ea75b655567f50622f48706

I've run a hundred times the test that previously hit it twice, no
reproductions.

> ---
> Subject: sched/eevdf: Fix heap corruption more
> From: Peter Zijlstra <peterz@...radead.org>
> Date: Tue Oct 17 16:59:47 CEST 2023
> 
> Because someone is a flaming idiot... :/
> 
> Fixes: 8dafa9d0eb1a ("sched/eevdf: Fix min_deadline heap integrity")
> Reported-by: 0599jiangyc@...il.com
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=218020
> ---
>  kernel/sched/fair.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -3699,7 +3699,8 @@ static void reweight_entity(struct cfs_r
>  		 */
>  		deadline = div_s64(deadline * old_weight, weight);
>  		se->deadline = se->vruntime + deadline;
> -		min_deadline_cb_propagate(&se->run_node, NULL);
> +		if (se != cfs_rq->curr)
> +			min_deadline_cb_propagate(&se->run_node, NULL);
>  	}
>  
>  #ifdef CONFIG_SMP

Thanks,
         Dmitry