Fix linux-gate handling in LinuxDumper so it gets a valid debug ID

A=ted R=nealsid at http://breakpad.appspot.com/284001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@788 4c0a9323-5329-0410-9bdc-e9ce6186880e

1 files changed, 15 insertions, 0 deletions

diff --git a/src/client/linux/minidump_writer/linux_dumper.cc b/src/client/linux/minidump_writer/linux_dumper.cc
index 76dc4db4..ab3a5ea5 100644
--- a/src/client/linux/minidump_writer/linux_dumper.cc
+++ b/src/client/linux/minidump_writer/linux_dumper.cc
@@ -213,6 +213,21 @@ LinuxDumper::ElfFileIdentifierForMapping(const MappingInfo& mapping,
   if (IsMappedFileOpenUnsafe(mapping))
     return false;
 
+  // Special-case linux-gate because it's not a real file.
+  if (my_strcmp(mapping.name, kLinuxGateLibraryName) == 0) {
+    const uintptr_t kPageSize = getpagesize();
+    void* linux_gate = NULL;
+    if (pid_ == sys_getpid()) {
+      linux_gate = reinterpret_cast<void*>(mapping.start_addr);
+    } else {
+      linux_gate = allocator_.Alloc(kPageSize);
+      CopyFromProcess(linux_gate, pid_,
+                      reinterpret_cast<const void*>(mapping.start_addr),
+                      kPageSize);
+    }
+    return FileID::ElfFileIdentifierFromMappedFile(linux_gate, identifier);
+  }
+
   char filename[NAME_MAX];
   size_t filename_len = my_strlen(mapping.name);
   assert(filename_len < NAME_MAX);