linux-kernel - Re: [PATCH v2] signal: Avoid undefined behaviour in kill_something

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Message-ID: <20170605133159.GA10301@redhat.com>
Date:   Mon, 5 Jun 2017 15:31:59 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     zhongjiang <zhongjiang@...wei.com>
Cc:     akpm@...ux-foundation.org, mhocko@...nel.org, vbabka@...e.cz,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        qiuxishi@...wei.com
Subject: Re: [PATCH v2] signal: Avoid undefined behaviour in
 kill_something_info

On 06/05, zhongjiang wrote:
>
> --- 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;

you need to do this before read_lock(tasklist)

Oleg.