From: Zachary Amsden <zach@vmware.com>
Date: Tue, 13 Feb 2007 12:26:21 +0000 (+0100)
Subject: [PATCH] i386: Kprobe rpl fix
X-Git-Tag: v2.6.21-rc1~184^2~65
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ac3b6faff961dd52fde71fb199ec3cf68ba35052;p=linux-2.6

[PATCH] i386: 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@vmware.com>
Signed-off-by: Andi Kleen <ak@suse.de>
CC: Eric Biederman <ebiederm@xmission.com>
---

diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
index b85cfa3ce1..b545bc746f 100644
--- a/arch/i386/kernel/kprobes.c
+++ b/arch/i386/kernel/kprobes.c
@@ -408,7 +408,7 @@ fastcall void *__kprobes trampoline_handler(struct pt_regs *regs)
 	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;