Re: [PATCH 16/18] arm64: kprobes: fix kprobes without CONFIG_KRETPROBES

Ard Biesheuvel
2019-10-21T06:22:17Z

On Fri, 18 Oct 2019 at 18:11, Sami Tolvanen <samitolvanen@google.com> wrote:
>
> This allows CONFIG_KRETPROBES to be disabled without disabling
> kprobes entirely.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Can we make kretprobes work with the shadow call stack instead?

> ---
> arch/arm64/kernel/probes/kprobes.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
> index c4452827419b..98230ae979ca 100644
> --- a/arch/arm64/kernel/probes/kprobes.c
> +++ b/arch/arm64/kernel/probes/kprobes.c
> @@ -551,6 +551,7 @@ void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
> return (void *)orig_ret_address;
> }
>
> +#ifdef CONFIG_KRETPROBES
> void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
> struct pt_regs *regs)
> {
> @@ -564,6 +565,7 @@ int __kprobes arch_trampoline_kprobe(struct kprobe *p)
> {
> return 0;
> }
> +#endif
>
> int __init arch_init_kprobes(void)
> {
> --
> 2.23.0.866.gb869b98d4c-goog
>