Subject: [PATCH v2 2/3] kprobes: adjust kprobe addr for KPROBES_ON_FTRACE

From: Jisheng Zhang <[email-masked]>
Date: Tue, 20 Aug 2019 03:53:31 +0000

For KPROBES_ON_FTRACE case, we need to adjust the kprobe's addr
correspondingly.

Signed-off-by: Jisheng Zhang <[email-masked]>
---
 kernel/kprobes.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 9873fc627d61..3fd2f68644da 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1484,15 +1484,19 @@ static inline int check_kprobe_rereg(struct kprobe *p)
 
 int __weak arch_check_ftrace_location(struct kprobe *p)
 {
-	unsigned long ftrace_addr;
+	unsigned long ftrace_addr, addr = (unsigned long)p->addr;
 
-	ftrace_addr = ftrace_location((unsigned long)p->addr);
+#ifdef CONFIG_KPROBES_ON_FTRACE
+	addr = ftrace_call_adjust(addr);
+#endif
+	ftrace_addr = ftrace_location(addr);
 	if (ftrace_addr) {
 #ifdef CONFIG_KPROBES_ON_FTRACE
 		/* Given address is not on the instruction boundary */
-		if ((unsigned long)p->addr != ftrace_addr)
+		if (addr != ftrace_addr)
 			return -EILSEQ;
 		p->flags |= KPROBE_FLAG_FTRACE;
+		p->addr = (kprobe_opcode_t *)addr;
 #else	/* !CONFIG_KPROBES_ON_FTRACE */
 		return -EINVAL;
 #endif
-- 
2.23.0.rc1

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