PR4886: check build-id if able.

This provides sanity check of debuginfo file based on build-id. Many cases are considered, whether build-id exists in debuginfo file or not, whether module is loaded or not, whether build-id exists in runtime kernel/module. It will do work when LD >= 2.18 and kernel >=2.6.23, otherwise no check.

1 files changed, 10 insertions, 1 deletions

diff --git a/runtime/transport/symbols.c b/runtime/transport/symbols.c
index 4bdd0904..faba0986 100644
--- a/runtime/transport/symbols.c
+++ b/runtime/transport/symbols.c
@@ -51,8 +51,16 @@ static void _stp_do_relocation(const char __user *buf, size_t count)
       if (strcmp (_stp_modules[mi]->name, msg.module))
         continue;
 
+      /* update note section to represent loaded */
+      if (_stp_modules[mi]->notes_sect == 0)
+	 _stp_modules[mi]->notes_sect = 1;	
       for (si=0; si<_stp_modules[mi]->num_sections; si++)
         {
+  	   if (!strcmp (".note.gnu.build-id", msg.reloc)) {
+		_stp_modules[mi]->notes_sect = msg.address;	
+		continue;
+	   }
+
           if (strcmp (_stp_modules[mi]->sections[si].name, msg.reloc))
             continue;
 
@@ -134,7 +142,8 @@ static int _stp_section_is_interesting(const char *name)
 {
 	int ret = 1;
 	if (!strncmp("__", name, 2)
-	    || !strncmp(".note", name, 5)
+	    || (!strncmp(".note", name, 5) 
+		&& strncmp(".note.gnu.build-id", name, 18))
 	    || !strncmp(".gnu", name, 4)
 	    || !strncmp(".mod", name, 4))
 		ret = 0;