linux-kernel - Re: [PATCH v3] signal: trace_signal_deliver when signal_group

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Date:   Tue, 23 Apr 2019 13:10:52 +0000
From:   weizhenliang <weizhenliang@...wei.com>
To:     Oleg Nesterov <oleg@...hat.com>
CC:     "ebiederm@...ssion.com" <ebiederm@...ssion.com>,
        "colona@...sta.com" <colona@...sta.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "christian@...uner.io" <christian@...uner.io>,
        "arnd@...db.de" <arnd@...db.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "deepa.kernel@...il.com" <deepa.kernel@...il.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v3] signal: trace_signal_deliver when signal_group_exit

On Mon, Apr 22, 2019 at 11:25 PM Oleg Nesterov <oleg@...hat.com> wrote:
>On 04/22, Zhenliang Wei wrote:
>>
>> --- a/kernel/signal.c
>> +++ b/kernel/signal.c
>> @@ -2441,6 +2441,7 @@ bool get_signal(struct ksignal *ksig)
>>  	if (signal_group_exit(signal)) {
>>  		ksig->info.si_signo = signr = SIGKILL;
>>  		sigdelset(&current->pending.signal, SIGKILL);
>> +		trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO, SIG_DFL);
>>  		recalc_sigpending();
>>  		goto fatal;
>>  	}
>
>Reviewed-by: Oleg Nesterov <oleg@...hat.com>

Last time Oleg suggested using SIG_DFL as the third parameter, but its type is 'void (*)(int)', but not expected 'struct k_sigaction *'.

How about
	trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO, &sighand->action[signr - 1]);
?

Although we know that action[SIGKILL] must be SIG_DFL, in order to adapt to the parameter type, I suggest to use the original variable value.

Zhenliang Wei.