linux-kernel - [PATCH 4/11] Kprobe rpl fix

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Message-Id: <200702060352.l163qttg000739@zach-dev.vmware.com>
Date:	Mon, 5 Feb 2007 19:52:55 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>
Subject: [PATCH 4/11] Kprobe rpl fix

Kprobes bugfix for paravirt compatibility - RPL on the CS when inserting
BPs must match running kernel.

Signed-off-by: Zachary Amsden <zach@...are.com>
CC: Eric Biederman <ebiederm@...ssion.com>

diff -r fad1c2108c13 arch/i386/kernel/kprobes.c
--- a/arch/i386/kernel/kprobes.c	Fri Feb 02 16:22:37 2007 -0800
+++ b/arch/i386/kernel/kprobes.c	Fri Feb 02 16:28:48 2007 -0800
@@ -408,7 +408,7 @@ fastcall void *__kprobes trampoline_hand
 	spin_lock_irqsave(&kretprobe_lock, flags);
 	head = kretprobe_inst_table_head(current);
 	/* fixup registers */
-	regs->xcs = __KERNEL_CS;
+	regs->xcs = __KERNEL_CS | get_kernel_rpl();
 	regs->eip = trampoline_address;
 	regs->orig_eax = 0xffffffff;
 
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