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From: Roman Divacky <rdivacky@FreeBSD.org>
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Subject: PERFORCE change 136936 for review
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http://perforce.freebsd.org/chv.cgi?CH=136936

Change 136936 by rdivacky@rdivacky_witten on 2008/03/05 18:16:33

	Check for sane maxevents parameter.
	
	Noticed by: netchild

Affected files ...

.. //depot/projects/soc2007/rdivacky/linux_epoll/sys/compat/linux/linux_epoll.c#11 edit
.. //depot/projects/soc2007/rdivacky/linux_epoll/sys/compat/linux/linux_epoll.h#5 edit

Differences ...

==== //depot/projects/soc2007/rdivacky/linux_epoll/sys/compat/linux/linux_epoll.c#11 (text+ko) ====

@@ -29,6 +29,7 @@
 
 #include "opt_compat.h"
 
+#include <sys/limits.h>
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/systm.h>
@@ -228,6 +229,9 @@
 					linux_kev_copyin};
 	int error;
 
+	if (args->maxevents <= 0 || args->maxevents > LINUX_MAX_EVENTS)
+		return (EINVAL);
+
 	/* Convert from miliseconds to timespec. */
 	ts.tv_sec = args->timeout / 1000000;
 	ts.tv_nsec = (args->timeout % 1000000) * 1000;

==== //depot/projects/soc2007/rdivacky/linux_epoll/sys/compat/linux/linux_epoll.h#5 (text+ko) ====

@@ -50,4 +50,6 @@
 #define	LINUX_EPOLL_CTL_DEL	2
 #define	LINUX_EPOLL_CTL_MOD	3
 
+#define	LINUX_MAX_EVENTS	(INT_MAX / sizeof(struct linux_epoll_event))
+
 #endif	/* !_LINUX_EPOLL_H_ */