auto_patch/common14-5.15/common/04_memory/0018-ARM-stacktrace-don-t-save-non-kernel-and-module-call.patch

From 2e2c39bd5f1a9505a7955bc27451b6bc16225cdd Mon Sep 17 00:00:00 2001
From: "qiankun.wang" <qiankun.wang@amlogic.com>
Date: Thu, 1 Dec 2022 15:06:56 +0800
Subject: [PATCH] ARM: stacktrace: don't save non kernel and module calls [2/2]

PD#SWPL-101774

Problem:
save_stack_trace now record user calls

Solution:
add kernel_or_module_addr judgement before save stack

Verify:
t5w 32bit

Change-Id: Ie029f6082aa1be33924018ec655267b426054aae
Signed-off-by: qiankun.wang <qiankun.wang@amlogic.com>
---
 arch/arm/kernel/stacktrace.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
index 824774999825..ae8c359abd4f 100644
--- a/arch/arm/kernel/stacktrace.c
+++ b/arch/arm/kernel/stacktrace.c
@@ -4,6 +4,10 @@
 #include <linux/sched/debug.h>
 #include <linux/stacktrace.h>
 
+#ifdef CONFIG_AMLOGIC_ARM_KASAN
+#include <linux/module.h>
+#endif
+
 #include <asm/sections.h>
 #include <asm/stacktrace.h>
 #include <asm/traps.h>
@@ -92,6 +96,17 @@ struct stack_trace_data {
 	unsigned int skip;
 };
 
+#ifdef CONFIG_AMLOGIC_ARM_KASAN
+static inline bool kernel_or_module_addr(unsigned long addr)
+{
+	if (addr >= (unsigned long)_stext && addr < (unsigned long)_end)
+		return true;
+	if (is_module_address((unsigned long)addr))
+		return true;
+	return false;
+}
+#endif
+
 static int save_trace(struct stackframe *frame, void *d)
 {
 	struct stack_trace_data *data = d;
@@ -106,7 +121,12 @@ static int save_trace(struct stackframe *frame, void *d)
 		return 0;
 	}
 
+#ifdef CONFIG_AMLOGIC_ARM_KASAN
+	if (kernel_or_module_addr(addr))
+		trace->entries[trace->nr_entries++] = addr;
+#else
 	trace->entries[trace->nr_entries++] = addr;
+#endif
 
 	if (trace->nr_entries >= trace->max_entries)
 		return 1;
@@ -118,7 +138,12 @@ static int save_trace(struct stackframe *frame, void *d)
 	if ((unsigned long)&regs[1] > ALIGN(frame->sp, THREAD_SIZE))
 		return 0;
 
+#ifdef CONFIG_AMLOGIC_ARM_KASAN
+	if (kernel_or_module_addr(regs->ARM_pc))
+		trace->entries[trace->nr_entries++] = regs->ARM_pc;
+#else
 	trace->entries[trace->nr_entries++] = regs->ARM_pc;
+#endif
 
 	return trace->nr_entries >= trace->max_entries;
 }
-- 
2.25.1