[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 b85cfa3ce1dd8e1f65db5cc010f95440bc49a0f9..b545bc746fceb2a9f6f192778c6dbca784395553 100644 (file)
--- 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;