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| author |   Oleg Nesterov <oleg@redhat.com> | 2015-07-21 15:40:16 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-07-31 10:38:04 +0200 |
| commit | 97da89767d398c1dfa1f34e5f312eb8ebb382f7f (patch) | |
| tree | 4ea64015b214f2f92ee68163906ada541225ecb5 /include/linux/uprobes.h | |
| parent | uprobes: Change handle_trampoline() to find the next chain beforehand (diff) | |
| download | linux-dev-97da89767d398c1dfa1f34e5f312eb8ebb382f7f.tar.xz linux-dev-97da89767d398c1dfa1f34e5f312eb8ebb382f7f.zip | |
uprobes: Export 'struct return_instance', introduce arch_uretprobe_is_alive()
Add the new "weak" helper, arch_uretprobe_is_alive(), used by
the next patches. It should return true if this return_instance
is still valid. The arch agnostic version just always returns
true.
The patch exports "struct return_instance" for the architectures
which want to override this hook. We can also cleanup
prepare_uretprobe() if we pass the new return_instance to
arch_uretprobe_hijack_return_addr().
Tested-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Anton Arapov <arapov@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150721134016.GA4762@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/uprobes.h')
| -rw-r--r-- | include/linux/uprobes.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index 60beb5dc7977..50d2764d66a8 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -92,6 +92,15 @@ struct uprobe_task { unsigned int depth; }; +struct return_instance { + struct uprobe *uprobe; + unsigned long func; + unsigned long orig_ret_vaddr; /* original return address */ + bool chained; /* true, if instance is nested */ + + struct return_instance *next; /* keep as stack */ +}; + struct xol_area; struct uprobes_state { @@ -128,6 +137,7 @@ 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 arch_uretprobe_is_alive(struct return_instance *ret, struct pt_regs *regs); extern bool arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs); extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr, void *src, unsigned long len); |