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From: Jake Burkholder <jake@FreeBSD.org>
Subject: PERFORCE change 9641 for review
To: Perforce Change Reviews <perforce@freebsd.org>
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http://people.freebsd.org/~peter/p4db/chv.cgi?CH=9641

Change 9641 by jake@jake_sparc64 on 2002/04/12 18:11:48

	Simple fix for a program sent by art@openbsd.org, which just
	misaligns the stack pointer and then calls into the kernel.
	This causes it to catch a sigbus instead of spin forever,
	which still isn't really right, but better than nothing.

Affected files ...

... //depot/projects/sparc64/sys/sparc64/sparc64/rwindow.c#10 edit

Differences ...

==== //depot/projects/sparc64/sys/sparc64/sparc64/rwindow.c#10 (text+ko) ====

@@ -60,6 +60,8 @@
 	for (i = 0; i < n; i++) {
 		CTR1(KTR_TRAP, "rwindow_load: usp=%#lx", usp);
 		usp += SPOFF;
+		if ((error = (usp & 0x7)) != 0)
+			break;
 		error = copyin((void *)usp, &rw, sizeof rw);
 		usp = rw.rw_in[6];
 	}
@@ -91,6 +93,8 @@
 		usp = *ausp;
 		CTR1(KTR_TRAP, "rwindow_save: usp=%#lx", usp);
 		usp += SPOFF;
+		if ((error = (usp & 0x7)) != 0)
+			break;
 		error = copyout(rw, (void *)usp, sizeof *rw);
 		if (error)
 			break;

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