linux-kernel - Re: signals logged / [RFC] log out-of-virtual-memory events

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Message-ID: <20070610195333.GB15616@vanheusden.com>
Date:	Sun, 10 Jun 2007 21:53:33 +0200
From:	Folkert van Heusden <folkert@...heusden.com>
To:	Satyam Sharma <satyam.sharma@...il.com>
Cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Andrea Righi <righiandr@...rs.sourceforge.net>,
	Andi Kleen <ak@...e.de>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: signals logged / [RFC] log out-of-virtual-memory events

> > >> >+    {
> > >> if (sig_fatal(t, sig)) {
> > >> >+            printk(KERN_WARNING "Sig %d send to %d owned by %d.%d 
> > >(%s)\n",
> > >> s/send/sent/;
> > >> >+            sig, t -> pid, t -> uid, t -> gid, t -> comm);
> > >> t->pid, t->uid, t->gid, t->comm);
> > >
> > 
> > Gargh ... why does this want to be in the *kernel*'s logs? In any case, can
> > you please make this KERN_INFO (or lower) instead of KERN_WARNING.
> Description:
> This patch adds code to the signal-sender making it log a message when
> an unhandled fatal signal will be delivered.

New version. This one also informs the user about the sende pid/uid of
the signal (when applicable).

Signed-of by: Folkert van Heusden <folkert@...heusden.com

--- linux/kernel/signal.c.org	2007-05-20 22:47:13.000000000 +0200
+++ linux/kernel/signal.c	2007-06-10 00:21:31.000000000 +0200
@@ -739,6 +739,18 @@
 	struct sigqueue * q = NULL;
 	int ret = 0;
 
+	/* unhandled fatal signals are logged */
+	if (sig_fatal(t, sig)) {
+		if (is_si_special(info))
+			printk(KERN_INFO "Sig %d sent to %d owned by %d.%d (%s)\n",
+				sig, t->pid, t->uid, t->gid, t->comm);
+		else
+			printk(KERN_INFO "Sig %d sent to %d owned by %d.%d (%s), sent by pid %d, uid %d\n",
+				sig, t->pid, t->uid, t->gid, t->comm,
+				info -> _sifields._kill._pid,
+				info -> _sifields._kill._uid);
+	}
+
 	/*
 	 * fast-pathed signals for kernel-internal things like SIGSTOP
 	 * or SIGKILL.


Folkert van Heusden

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