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Subject[PATCH bpf-next v2 2/3] bpf: export crash_kexec() as destructive kfunc
Date
Allow properly marked bpf programs to call crash_kexec().

Signed-off-by: Artem Savkov <asavkov@redhat.com>
---
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;
+}
+
+subsys_initcall(crash_kfunc_init);
+#endif
--
2.35.3
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