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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 <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2012-12-30 15:21:22 +01:00
parent da1816b1ca
commit cf31ec3f7f
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/uprobes.c
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@ -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;
}