linux-kernel - Re: [PATCH] staging: android: ion: Bail out upon SIGKILL when allocating memory.

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Date:   Mon, 1 Jul 2019 07:36:42 -0400
From:   Laura Abbott <labbott@...hat.com>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: android: ion: Bail out upon SIGKILL when
 allocating memory.

On 7/1/19 6:55 AM, Tetsuo Handa wrote:
> Andrew, can you pick up this patch? No response from Laura Abbott nor Sumit Semwal.
> 
> On 2019/06/21 18:58, Tetsuo Handa wrote:
>>  From e0758655727044753399fb4f7c5f3eb25ac5cccd Mon Sep 17 00:00:00 2001
>> From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
>> Date: Fri, 21 Jun 2019 11:22:51 +0900
>> Subject: [PATCH] staging: android: ion: Bail out upon SIGKILL when allocating memory.
>>
>> syzbot found that a thread can stall for minutes inside
>> ion_system_heap_allocate() after that thread was killed by SIGKILL [1].
>> Let's check for SIGKILL before doing memory allocation.
>>
>> [1] https://syzkaller.appspot.com/bug?id=a0e3436829698d5824231251fad9d8e998f94f5e
>>
>> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
>> Reported-by: syzbot <syzbot+8ab2d0f39fb79fe6ca40@...kaller.appspotmail.com>
>> ---
>>   drivers/staging/android/ion/ion_page_pool.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
>> index fd4995fb676e..f85ec5b16b65 100644
>> --- a/drivers/staging/android/ion/ion_page_pool.c
>> +++ b/drivers/staging/android/ion/ion_page_pool.c
>> @@ -8,11 +8,14 @@
>>   #include <linux/list.h>
>>   #include <linux/slab.h>
>>   #include <linux/swap.h>
>> +#include <linux/sched/signal.h>
>>   
>>   #include "ion.h"
>>   
>>   static inline struct page *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
>>   {
>> +	if (fatal_signal_pending(current))
>> +		return NULL;
>>   	return alloc_pages(pool->gfp_mask, pool->order);
>>   }
>>   
>>
> 

Acked-by: Laura Abbott <labbott@...hat.com>