[PATCH 07/13] powerpc/kprobes: Unpoison instruction in kprobe struct

[Nicholas Miehlbradt]

KMSAN does not unpoison the ainsn field of a kprobe struct correctly.
Manually unpoison it to prevent false positives.

Signed-off-by: Nicholas Miehlbradt <nicholas at linux.ibm.com>
---
 arch/powerpc/kernel/kprobes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index b20ee72e873a..1cbec54f2b6a 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -27,6 +27,7 @@
 #include <asm/sections.h>
 #include <asm/inst.h>
 #include <linux/uaccess.h>
+#include <linux/kmsan-checks.h>
 
 DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
 DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
@@ -179,6 +180,7 @@ int arch_prepare_kprobe(struct kprobe *p)
 
 	if (!ret) {
 		patch_instruction(p->ainsn.insn, insn);
+		kmsan_unpoison_memory(p->ainsn.insn, sizeof(kprobe_opcode_t));
 		p->opcode = ppc_inst_val(insn);
 	}
 
-- 
2.40.1