linux-kernel - RE: [PATCH] signal: Fix the error return of kill -1

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Date:   Tue, 15 Aug 2023 14:47:07 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Oleg Nesterov' <oleg@...hat.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
CC:     Petr Skocik <pskocik@...il.com>, Kees Cook <keescook@...omium.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Marco Elver" <elver@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] signal: Fix the error return of kill -1

From: Oleg Nesterov
> Sent: 14 August 2023 16:44
...
> Even simpler
> 
> 	} else {
> 		struct task_struct * p;
> 		bool success = false;
> 		int err = -ESRCH;

		int err;
		ret = -ESRCH;

> 
> 		for_each_process(p) {
> 			if (task_pid_vnr(p) > 1 &&
> 					!same_thread_group(p, current)) {
> 				err = group_send_sig_info(sig, info, p,
> 							  PIDTYPE_MAX);
> 				success |= !err;
> 			}
> 		}
> 		ret = success ? 0 : err;
> 	}

or maybe even:
	} else {
		struct task_struct * p;
		int err;
		ret = -ESRCH;

		for_each_process(p) {
			if (task_pid_vnr(p) > 1 &&
					!same_thread_group(p, current)) {
				err = group_send_sig_info(sig, info, p,
							  PIDTYPE_MAX);
				if (ret)
					ret = err; 
			}
		}
	}

	David

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