PR/42787 CVS commit: [netbsd-5-0] src/sys/arch/i386/i386

[Manuel Bouyer <bouyer%netbsd.org@localhost>]

The following reply was made to PR port-i386/42787; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/42787 CVS commit: [netbsd-5-0] src/sys/arch/i386/i386
Date: Tue, 16 Feb 2010 21:24:22 +0000

 Module Name:   src
 Committed By:  bouyer
 Date:          Tue Feb 16 21:24:22 UTC 2010
 
 Modified Files:
        src/sys/arch/i386/i386 [netbsd-5-0]: ibcs2_machdep.c svr4_machdep.c
 
 Log Message:
 Pull up following revision(s) (requested by drochner in ticket #1307):
        sys/arch/i386/i386/svr4_machdep.c: revision 1.96
        sys/arch/i386/i386/ibcs2_machdep.c: revision 1.40
 fix confused CS selector, fixes the panic reported by Mark Davis
 per PR port-i386/42787 (the panic happens due to a GPF when a
 privileged descriptor is tried to be loaded with the UPL bit set)
 The original bug is very old (pre-2.0, i386/svr4_machdep.c rev. 1.69),
 but it was relatively harmless until the order of GDT entries was
 shuffled (pre-5.0, i386/segments.h rev. 1.42). Before, it caused
 a userlevel data selector to be used for CS which broke the emulation
 (likely the reason of PR port-i386/32424). The shuffle made that
 a privileged selector was used, causing the GPF.
 (recent -current doesn't panic on that GPF which seems to be a
 side effect of another change)
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.36 -r1.36.16.1 src/sys/arch/i386/i386/ibcs2_machdep.c
 cvs rdiff -u -r1.92 -r1.92.6.1 src/sys/arch/i386/i386/svr4_machdep.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.