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Subject[PATCH v4 01/16] uprobes: allow ignoring of probe hits
Date
From: "David A. Long" <dave.long@linaro.org>

Allow arches to decided to ignore a probe hit. ARM will use this to
only call handlers if the conditions to execute a conditionally executed
instruction are satisfied.

Signed-off-by: David A. Long <dave.long@linaro.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
---
include/linux/uprobes.h | 1 +
kernel/events/uprobes.c | 9 +++++++++
2 files changed, 10 insertions(+)

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 319eae7..197a36e 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -134,6 +134,7 @@ extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
+extern bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs);
#else /* !CONFIG_UPROBES */
struct uprobes_state {
};
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 24b7d6c..4eec7ce 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1778,6 +1778,11 @@ static bool handle_trampoline(struct pt_regs *regs)
return true;
}

+bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs)
+{
+ return false;
+}
+
/*
* Run handler and ask thread to singlestep.
* Ensure all non-fatal signals cannot interrupt thread while it singlesteps.
@@ -1828,7 +1833,11 @@ static void handle_swbp(struct pt_regs *regs)
if (unlikely(!test_bit(UPROBE_COPY_INSN, &uprobe->flags)))
goto out;

+ if (arch_uprobe_ignore(&uprobe->arch, regs))
+ goto out;
+
handler_chain(uprobe, regs);
+
if (can_skip_sstep(uprobe, regs))
goto out;

--
1.8.1.2


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