From cf31ec3f7fece93f3fce3ee5964e27857141ea47 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Sun, 30 Dec 2012 15:21:22 +0100 Subject: [PATCH] uprobes/x86: Change __skip_sstep() to actually skip the whole insn __skip_sstep() doesn't update regs->ip. Currently this is correct but only "by accident" and it doesn't skip the whole insn. Change it to advance ->ip by the length of the detected 0x66*0x90 sequence. Signed-off-by: Oleg Nesterov Acked-by: Srikar Dronamraju --- arch/x86/kernel/uprobes.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c index c71025b6746..4e33a35d659 100644 --- a/arch/x86/kernel/uprobes.c +++ b/arch/x86/kernel/uprobes.c @@ -680,8 +680,11 @@ static bool __skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) if (auprobe->insn[i] == 0x66) continue; - if (auprobe->insn[i] == 0x90) + if (auprobe->insn[i] == 0x90) { + regs->ip = uprobe_get_swbp_addr(regs); + regs->ip += i + 1; return true; + } break; } -- 2.20.1