Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6fe50a28 authored by David A. Long's avatar David A. Long
Browse files

uprobes: allow ignoring of probe hits 



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: default avatarDavid A. Long <dave.long@linaro.org>
Acked-by: default avatarOleg Nesterov <oleg@redhat.com>
parent 21254ebc

include/linux/uprobes.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

};

kernel/events/uprobes.c

+9 −0
Original line number Diff line number Diff line
@@ -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;