Messages in this thread | | | Date | Sun, 7 Apr 2013 17:21:14 +0530 | From | Srikar Dronamraju <> | Subject | Re: [PATCH v1 4/9] uretprobes/ppc: Hijack return address |
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* Anton Arapov <anton@redhat.com> [2013-04-03 18:00:34]:
> Hijack the return address and replace it with a trampoline address. > PowerPC implementation. > > Signed-off-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
> --- > arch/powerpc/include/asm/uprobes.h | 1 + > arch/powerpc/kernel/uprobes.c | 13 +++++++++++++ > 2 files changed, 14 insertions(+) > > diff --git a/arch/powerpc/include/asm/uprobes.h b/arch/powerpc/include/asm/uprobes.h > index b532060..2301602 100644 > --- a/arch/powerpc/include/asm/uprobes.h > +++ b/arch/powerpc/include/asm/uprobes.h > @@ -51,4 +51,5 @@ extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs); > 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); > #endif /* _ASM_UPROBES_H */ > diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c > index bc77834..567b975 100644 > --- a/arch/powerpc/kernel/uprobes.c > +++ b/arch/powerpc/kernel/uprobes.c > @@ -188,3 +188,16 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) > > return false; > } > + > +unsigned long > +arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs) > +{ > + unsigned long orig_ret_vaddr; > + > + orig_ret_vaddr = regs->link; > + > + /* Replace the return addr with trampoline addr */ > + regs->link = trampoline_vaddr; > + > + return orig_ret_vaddr; > +} > -- > 1.8.1.4 >
-- Thanks and Regards Srikar Dronamraju
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