From: zhong jiang <zhongjiang@huawei.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: akpm@linux-foundation.org, stsp@list.ru, Waiman.Long@hpe.com,
mingo@kernel.org, mhocko@kernel.org, vbabka@suse.cz,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
qiuxishi@huawei.com
Subject: Re: [PATCH] signal: Avoid undefined behaviour in kill_something_info
Date: Mon, 5 Jun 2017 20:47:47 +0800 [thread overview]
Message-ID: <593552F3.4040407@huawei.com> (raw)
In-Reply-To: <20170605123744.GA9807@redhat.com>
On 2017/6/5 20:37, Oleg Nesterov wrote:
> On 06/05, zhongjiang wrote:
>> static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
>> {
>> - int ret;
>> + int ret, vpid;
>>
>> if (pid > 0) {
>> rcu_read_lock();
>> @@ -1395,8 +1395,12 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
>>
>> read_lock(&tasklist_lock);
>> if (pid != -1) {
>> + if (pid == INT_MIN)
>> + vpid = INT_MAX;
> Well, this probably needs a comment to explain that this is just "avoid ub".
>
> And if we really want the fix, to me
>
> if (pid == INT_MIN)
> return -ESRCH;
>
> at the start makes more sense...
>
> Oleg.
>
>
> .
>
ok, I will motify it in v2 shortly, Thanks
Regards
zhongjiang
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WARNING: multiple messages have this Message-ID (diff)
From: zhong jiang <zhongjiang@huawei.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: <akpm@linux-foundation.org>, <stsp@list.ru>,
<Waiman.Long@hpe.com>, <mingo@kernel.org>, <mhocko@kernel.org>,
<vbabka@suse.cz>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>, <qiuxishi@huawei.com>
Subject: Re: [PATCH] signal: Avoid undefined behaviour in kill_something_info
Date: Mon, 5 Jun 2017 20:47:47 +0800 [thread overview]
Message-ID: <593552F3.4040407@huawei.com> (raw)
In-Reply-To: <20170605123744.GA9807@redhat.com>
On 2017/6/5 20:37, Oleg Nesterov wrote:
> On 06/05, zhongjiang wrote:
>> static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
>> {
>> - int ret;
>> + int ret, vpid;
>>
>> if (pid > 0) {
>> rcu_read_lock();
>> @@ -1395,8 +1395,12 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
>>
>> read_lock(&tasklist_lock);
>> if (pid != -1) {
>> + if (pid == INT_MIN)
>> + vpid = INT_MAX;
> Well, this probably needs a comment to explain that this is just "avoid ub".
>
> And if we really want the fix, to me
>
> if (pid == INT_MIN)
> return -ESRCH;
>
> at the start makes more sense...
>
> Oleg.
>
>
> .
>
ok, I will motify it in v2 shortly, Thanks
Regards
zhongjiang
next prev parent reply other threads:[~2017-06-05 12:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-05 9:11 [PATCH] signal: Avoid undefined behaviour in kill_something_info zhongjiang
2017-06-05 9:11 ` zhongjiang
2017-06-05 12:37 ` Oleg Nesterov
2017-06-05 12:37 ` Oleg Nesterov
2017-06-05 12:47 ` zhong jiang [this message]
2017-06-05 12:47 ` zhong jiang
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