From: zhong jiang <zhongjiang@huawei.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: akpm@linux-foundation.org, oleg@redhat.com, vbabka@suse.cz,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
qiuxishi@huawei.com
Subject: Re: [PATCH v2] signal: Avoid undefined behaviour in kill_something_info
Date: Mon, 5 Jun 2017 21:18:59 +0800 [thread overview]
Message-ID: <59355A43.7000706@huawei.com> (raw)
In-Reply-To: <20170605130903.GP9248@dhcp22.suse.cz>
On 2017/6/5 21:09, Michal Hocko wrote:
> On Mon 05-06-17 20:53:27, zhongjiang wrote:
>> diff --git a/kernel/signal.c b/kernel/signal.c
>> index ca92bcf..63148f7 100644
>> --- a/kernel/signal.c
>> +++ b/kernel/signal.c
>> @@ -1395,6 +1395,12 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
>>
>> read_lock(&tasklist_lock);
>> if (pid != -1) {
>> + /*
>> + * -INT_MIN is undefined, it need to exclude following case to
>> + * avoid the UBSAN detection.
>> + */
>> + if (pid == INT_MIN)
>> + return -ESRCH;
> this will obviously keep the tasklist_lock held...
oh, it is my fault. Thank you for clarify.
Thanks
zhongjiang
>> ret = __kill_pgrp_info(sig, info,
>> pid ? find_vpid(-pid) : task_pgrp(current));
>> } else {
>> --
>> 1.7.12.4
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next prev parent reply other threads:[~2017-06-05 13:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-05 12:53 zhongjiang
2017-06-05 13:09 ` Michal Hocko
2017-06-05 13:18 ` zhong jiang [this message]
2017-06-05 13:31 ` Oleg Nesterov
2017-06-05 13:46 ` zhong jiang
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