diff mbox series

[01/32] ftrace: Unpoison ftrace_regs in ftrace_ops_list_func()

Message ID 20231115203401.2495875-2-iii@linux.ibm.com (mailing list archive)
State Superseded
Headers show
Series kmsan: Enable on s390 | expand

Commit Message

Ilya Leoshkevich Nov. 15, 2023, 8:30 p.m. UTC 
Architectures use assembly code to initialize ftrace_regs and call
ftrace_ops_list_func(). Therefore, from the KMSAN's point of view,
ftrace_regs is poisoned on ftrace_ops_list_func entry(). This causes
KMSAN warnings when running the ftrace testsuite.

Fix by trusting the architecture-specific assembly code and always
unpoisoning ftrace_regs in ftrace_ops_list_func.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 kernel/trace/ftrace.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 8de8bec5f366..dfb8b26966aa 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -7399,6 +7399,7 @@  __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
 void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
 			       struct ftrace_ops *op, struct ftrace_regs *fregs)
 {
+	kmsan_unpoison_memory(fregs, sizeof(*fregs));
 	__ftrace_ops_list_func(ip, parent_ip, NULL, fregs);
 }
 #else