Currently this doesn't matter, the only ->pre_xol() hook can't fail,
but we need to fix arch_uprobe_pre_xol() anyway. If ->pre_xol() fails
we should not change regs->ip/flags, we should just return the error
to make restart actually possible.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
---
arch/x86/kernel/uprobes.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 4bbeb60..9690c65 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -676,6 +676,12 @@ int arch_uprobe_pre_xol(struct arch_uprobe *auprobe,
struct pt_regs *regs)
{
struct uprobe_task *utask = current->utask;
+ if (auprobe->ops->pre_xol) {
+ int err = auprobe->ops->pre_xol(auprobe, regs);
+ if (err)
+ return err;
+ }
+
regs->ip = utask->xol_vaddr;
utask->autask.saved_trap_nr = current->thread.trap_nr;
current->thread.trap_nr = UPROBE_TRAP_NR;
@@ -685,8 +691,6 @@ int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct
pt_regs *regs)
if (test_tsk_thread_flag(current, TIF_BLOCKSTEP))
set_task_blockstep(current, false);
- if (auprobe->ops->pre_xol)
- return auprobe->ops->pre_xol(auprobe, regs);
return 0;
}
--
1.5.5.1
--
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