From a7998a2b765721709158df4c38f044a038f8b549 Mon Sep 17 00:00:00 2001
From: Daniel Pouzzner <douzzer@wolfssl.com>
Date: Tue, 20 Aug 2024 18:10:25 -0500
Subject: [PATCH] linuxkm: add support for WOLFSSL_DEBUG_BACKTRACE_ERROR_CODES
 using dump_stack().

---
 linuxkm/linuxkm_wc_port.h | 8 ++++++++
 linuxkm/module_hooks.c    | 4 ++++
 wolfcrypt/src/logging.c   | 9 +++++++++
 3 files changed, 21 insertions(+)

diff --git a/linuxkm/linuxkm_wc_port.h b/linuxkm/linuxkm_wc_port.h
index 189a26e348..68592582ad 100644
--- a/linuxkm/linuxkm_wc_port.h
+++ b/linuxkm/linuxkm_wc_port.h
@@ -632,6 +632,10 @@
         #endif
         #endif
 
+        #ifdef WOLFSSL_DEBUG_BACKTRACE_ERROR_CODES
+        typeof(dump_stack) *dump_stack;
+        #endif
+
         const void *_last_slot;
     };
 
@@ -777,6 +781,10 @@
         #endif
     #endif
 
+    #ifdef WOLFSSL_DEBUG_BACKTRACE_ERROR_CODES
+        #define dump_stack (wolfssl_linuxkm_get_pie_redirect_table()->dump_stack)
+    #endif
+
     #endif /* __PIE__ */
 
     #endif /* USE_WOLFSSL_LINUXKM_PIE_REDIRECT_TABLE */
diff --git a/linuxkm/module_hooks.c b/linuxkm/module_hooks.c
index f1bf46f8fb..adf3fbf64f 100644
--- a/linuxkm/module_hooks.c
+++ b/linuxkm/module_hooks.c
@@ -580,6 +580,10 @@ static int set_up_wolfssl_linuxkm_pie_redirect_table(void) {
 #endif
 #endif
 
+#ifdef WOLFSSL_DEBUG_BACKTRACE_ERROR_CODES
+    wolfssl_linuxkm_pie_redirect_table.dump_stack = dump_stack;
+#endif
+
     /* runtime assert that the table has no null slots after initialization. */
     {
         unsigned long *i;
diff --git a/wolfcrypt/src/logging.c b/wolfcrypt/src/logging.c
index 9568f1c6a1..d548cd6149 100644
--- a/wolfcrypt/src/logging.c
+++ b/wolfcrypt/src/logging.c
@@ -1721,6 +1721,14 @@ void WOLFSSL_ERROR_MSG(const char* msg)
 
 #ifdef WOLFSSL_DEBUG_BACKTRACE_ERROR_CODES
 
+#ifdef WOLFSSL_LINUXKM
+
+void wc_backtrace_render(void) {
+    dump_stack();
+}
+
+#else /* !WOLFSSL_LINUXKM */
+
 #include <backtrace-supported.h>
 
 #if BACKTRACE_SUPPORTED != 1
@@ -1848,5 +1856,6 @@ void wc_backtrace_render(void) {
 
     wc_UnLockMutex(&backtrace_mutex);
 }
+#endif /* !WOLFSSL_LINUXKM */
 
 #endif /* WOLFSSL_DEBUG_BACKTRACE_ERROR_CODES */