On Tue, Aug 02, 2022 at 11:10:29AM +0200, Artem Savkov wrote:
> Allow properly marked bpf programs to call crash_kexec().
>
> Signed-off-by: Artem Savkov <asavkov@xxxxxxxxxx>
> ---
> kernel/kexec_core.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> index 4d34c78334ce..9259ea3bd693 100644
> --- a/kernel/kexec_core.c
> +++ b/kernel/kexec_core.c
> @@ -39,6 +39,8 @@
> #include <linux/hugetlb.h>
> #include <linux/objtool.h>
> #include <linux/kmsg_dump.h>
> +#include <linux/btf.h>
> +#include <linux/btf_ids.h>
>
> #include <asm/page.h>
> #include <asm/sections.h>
> @@ -1238,3 +1240,22 @@ void __weak arch_kexec_protect_crashkres(void)
>
> void __weak arch_kexec_unprotect_crashkres(void)
> {}
> +
> +#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
> +BTF_SET8_START(kexec_btf_ids)
> +BTF_ID_FLAGS(func, crash_kexec, KF_DESTRUCTIVE)
> +BTF_SET8_END(kexec_btf_ids)
> +
> +static const struct btf_kfunc_id_set kexec_kfunc_set = {
> + .owner = THIS_MODULE,
> + .set = &kexec_btf_ids,
> +};
> +
> +static int __init crash_kfunc_init(void)
> +{
> + register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &kexec_kfunc_set);
> + return 0;
should we do 'return register_btf_kfunc_id_set(...' in here?
jirka
> +}
> +
> +subsys_initcall(crash_kfunc_init);
> +#endif
> --
> 2.35.3
>
