Date: Mon, 26 Sep 2005 23:52:23 GMT From: Peter Wemm <peter@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 84320 for review Message-ID: <200509262352.j8QNqNWQ036502@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=84320 Change 84320 by peter@peter_melody on 2005/09/26 23:51:30 Mask off user supplied upper bits for %dr6 and %dr7 Affected files ... .. //depot/projects/hammer/sys/amd64/amd64/machdep.c#140 edit Differences ... ==== //depot/projects/hammer/sys/amd64/amd64/machdep.c#140 (text+ko) ==== @@ -1731,6 +1731,13 @@ i++, mask1 <<= 2, mask2 <<= 2) if ((dbregs->dr[7] & mask1) == mask2) return (EINVAL); + /* + * Bits 5-12 and 32-63 are reserved for dr6, and bits 10-15 and + * 32-63 of dr7 are reserved. However, bits 32-63 cause a GPF. + */ + if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 || + (dbregs->dr[7] & 0xffffffff00000000ul) != 0) + return (EINVAL); pcb = td->td_pcb;
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