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    Subject[PATCH v6 01/14] 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 e32251e..edff2b9 100644
    --- a/include/linux/uprobes.h
    +++ b/include/linux/uprobes.h
    @@ -126,6 +126,7 @@ 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 307d87c..04709b6 100644
    --- a/kernel/events/uprobes.c
    +++ b/kernel/events/uprobes.c
    @@ -1804,6 +1804,11 @@ 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.
    @@ -1858,7 +1863,11 @@ static void handle_swbp(struct pt_regs *regs)
    if (!get_utask())
    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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