From a2fc410f624aee3005595ce04eecf7cf03637eec Mon Sep 17 00:00:00 2001
From: CX <166474602+Tr33NewBee@users.noreply.github.com>
Date: Tue, 7 Jan 2025 10:37:01 +0800
Subject: [PATCH 1/2] fix:#148

---
 tools/kallsym.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/kallsym.c b/tools/kallsym.c
index 9961a73f..ce0e3e0b 100644
--- a/tools/kallsym.c
+++ b/tools/kallsym.c
@@ -63,8 +63,13 @@ static int find_linux_banner(kallsym_t *info, char *img, int32_t imglen)
             info->linux_banner_offset[info->banner_num++] = (int32_t)(banner - img);
             tools_logi("linux_banner %d: %s", info->banner_num, banner);
             tools_logi("linux_banner offset: 0x%lx\n", banner - img);
+            break;
         }
     }
+    if(info->banner_num<=0) {
+        tools_loge("find linux_banner error\n");
+        return -1;
+    }
     banner = img + info->linux_banner_offset[info->banner_num - 1];
 
     char *uts_release_start = banner + prefix_len;

From 0c4e1aee714da181df8838ed1e7995c30c9cc784 Mon Sep 17 00:00:00 2001
From: Tr33NewBee <166474602+Tr33NewBee@users.noreply.github.com>
Date: Fri, 10 Jan 2025 11:40:52 +0800
Subject: [PATCH 2/2] fix:android memmem error.#148

---
 tools/kallsym.c | 39 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/tools/kallsym.c b/tools/kallsym.c
index ce0e3e0b..0e0f4d54 100644
--- a/tools/kallsym.c
+++ b/tools/kallsym.c
@@ -39,6 +39,37 @@ static void *memmem(const void *haystack, size_t haystack_len, const void *const
 }
 #endif
 
+//copy from  https://github.com/gcc-mirror/gcc/blob/master/libiberty/memmem.c
+static /* Return the first occurrence of NEEDLE in HAYSTACK.  */
+void *
+gcc_libc_memmem (const void *haystack, size_t haystack_len, const void *needle,
+	size_t needle_len)
+{
+  const char *begin;
+  const char *const last_possible
+    = (const char *) haystack + haystack_len - needle_len;
+
+  if (needle_len == 0)
+    /* The first occurrence of the empty string is deemed to occur at
+       the beginning of the string.  */
+    return (void *) haystack;
+
+  /* Sanity check, otherwise the loop might search through the whole
+     memory.  */
+  if (__builtin_expect (haystack_len < needle_len, 0))
+    return NULL;
+
+  for (begin = (const char *) haystack; begin <= last_possible; ++begin)
+    if (begin[0] == ((const char *) needle)[0] &&
+	!memcmp ((const void *) &begin[1],
+		 (const void *) ((const char *) needle + 1),
+		 needle_len - 1))
+      return (void *) begin;
+
+  return NULL;
+}
+void *(*memmem_ptr)(const void *haystack, size_t haystack_len, const void *needle, size_t needle_len);
+
 static int find_linux_banner(kallsym_t *info, char *img, int32_t imglen)
 {
     /*
@@ -58,12 +89,16 @@ static int find_linux_banner(kallsym_t *info, char *img, int32_t imglen)
     char *imgend = img + imglen;
     char *banner = (char *)img;
     info->banner_num = 0;
-    while ((banner = (char *)memmem(banner + 1, imgend - banner, linux_banner_prefix, prefix_len)) != NULL) {
+    
+    memmem_ptr = memmem;
+    #ifdef  __ANDROID__
+        memmem_ptr = gcc_libc_memmem;
+    #endif
+    while ((banner = (char *)memmem_ptr(banner + 1, imgend - banner, linux_banner_prefix, prefix_len)) != NULL) {
         if (isdigit(*(banner + prefix_len)) && *(banner + prefix_len + 1) == '.') {
             info->linux_banner_offset[info->banner_num++] = (int32_t)(banner - img);
             tools_logi("linux_banner %d: %s", info->banner_num, banner);
             tools_logi("linux_banner offset: 0x%lx\n", banner - img);
-            break;
         }
     }
     if(info->banner_num<=0) {