lkml.org 
[lkml]   [2022]   [Jul]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH bpf-next 4/4] 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 | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 4d34c78334ce4..a21fe8d326a8e 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 +1240,23 @@ void __weak arch_kexec_protect_crashkres(void)

void __weak arch_kexec_unprotect_crashkres(void)
{}
+
+#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
+BTF_SET_START(kexec_btf_ids)
+BTF_ID(func, crash_kexec)
+BTF_SET_END(kexec_btf_ids)
+
+static const struct btf_kfunc_id_set kexec_kfunc_set = {
+ .owner = THIS_MODULE,
+ .check_set = &kexec_btf_ids,
+ .destructive_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
\
 
 \ /
  Last update: 2022-07-20 13:48    [W:0.067 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site