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uprobes: allow ignoring of probe hits

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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>
This commit is contained in:
David A. Long 2014-02-03 14:25:49 -05:00
parent 21254ebc9e
commit 6fe50a28ba
2 changed files with 10 additions and 0 deletions
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1
include/linux/uprobes.h
View File

@ -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 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 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 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 */ #else /* !CONFIG_UPROBES */
struct uprobes_state { struct uprobes_state {
}; };

9
kernel/events/uprobes.c
View File

@ -1804,6 +1804,11 @@ static bool handle_trampoline(struct pt_regs *regs)
return true; return true;
} }
bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs)
{
return false;
}
/* /*
* Run handler and ask thread to singlestep. * Run handler and ask thread to singlestep.
* Ensure all non-fatal signals cannot interrupt thread while it singlesteps. * 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()) if (!get_utask())
goto out; goto out;
if (arch_uprobe_ignore(&uprobe->arch, regs))
goto out;
handler_chain(uprobe, regs); handler_chain(uprobe, regs);
if (can_skip_sstep(uprobe, regs)) if (can_skip_sstep(uprobe, regs))
goto out; goto out;