From c574ca24bc991c8a48f780c7912eff3574b3c43a Mon Sep 17 00:00:00 2001
From: ZhaoLei <77103671+zhaolei0505@users.noreply.github.com>
Date: Wed, 19 Oct 2022 14:24:00 +0800
Subject: [PATCH] feat: save Elf BuildId in corefile. (#204)

---
 src/platform/unix/core/linux/elfcore.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/platform/unix/core/linux/elfcore.cc b/src/platform/unix/core/linux/elfcore.cc
index 076dc4c..7f59077 100644
--- a/src/platform/unix/core/linux/elfcore.cc
+++ b/src/platform/unix/core/linux/elfcore.cc
@@ -944,6 +944,14 @@ static int CreateElfCore(void* handle,
                 mappings[i].end_address - mappings[i].start_address;
           }
 
+          /* We could save the first page of ELF to record the BuildId,
+           * let the debugger later find the corresponding binary it used.
+           */
+          if (!dontdump && mappings[i].write_size == 0 && 
+                  (mappings[i].flags & PF_X) != 0) {
+            mappings[i].write_size = pagesize;
+          }
+
           /* Remove mapping, if it was not readable, or completely zero
            * anyway. The former is usually the case of stack guard pages, and
            * the latter occasionally happens for unused memory.