From: Alexander Bulekov <alxndr@bu.edu>
Date: Tue, 12 May 2020 03:01:32 +0000 (-0400)
Subject: fuzz: add mangled object name to linker script
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3b113229c5d5477d34f54fce0a3e8781090c93b6;p=qemu.git

fuzz: add mangled object name to linker script

Previously, we relied on "FuzzerTracePC*(.bss*)" to place libfuzzer's
fuzzer::TPC object into our contiguous shared-memory region. This does
not work for some libfuzzer builds, so this addition identifies the
region by its mangled name: *(.bss._ZN6fuzzer3TPCE);

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-id: 20200512030133.29896-4-alxndr@bu.edu
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---

diff --git a/tests/qtest/fuzz/fork_fuzz.ld b/tests/qtest/fuzz/fork_fuzz.ld
index e086bba873..bfb667ed06 100644
--- a/tests/qtest/fuzz/fork_fuzz.ld
+++ b/tests/qtest/fuzz/fork_fuzz.ld
@@ -28,6 +28,11 @@ SECTIONS
 
       /* Internal Libfuzzer TracePC object which contains the ValueProfileMap */
       FuzzerTracePC*(.bss*);
+      /*
+       * In case the above line fails, explicitly specify the (mangled) name of
+       * the object we care about
+       */
+       *(.bss._ZN6fuzzer3TPCE);
   }
   .data.fuzz_end : ALIGN(4K)
   {