fuzz: Make fork_fuzz.ld compatible with LLVM's LLD

LLVM's linker, LLD, supports the keyword "INSERT AFTER", starting with
version 11.
However, when multiple sections are defined in the same "INSERT AFTER",
they are added in a reversed order, compared to BFD's LD.

This patch makes fork_fuzz.ld generic enough to work with both linkers.
Each section now has its own "INSERT AFTER" keyword, so proper ordering is
defined between the sections added.

Signed-off-by: Daniele Buono <dbuono@linux.vnet.ibm.com>
Message-Id: <20201105221905.1350-2-dbuono@linux.vnet.ibm.com>
Reviewed-by: Alexander Bulekov <alxndr@bu.edu>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Thomas Huth <thuth@redhat.com>

diff --git a/tests/qtest/fuzz/fork_fuzz.ld b/tests/qtest/fuzz/fork_fuzz.ld
index bfb667ed06883a8ace8412da7bd58e3bd2e987e6..cfb88b7fdb51eb50f7d64b2cfc3d3f7a97197115 100644 (file)
--- a/tests/qtest/fuzz/fork_fuzz.ld
+++ b/tests/qtest/fuzz/fork_fuzz.ld
@@ -16,6 +16,11 @@ SECTIONS
       /* Lowest stack counter */
       *(__sancov_lowest_stack);
   }
+}
+INSERT AFTER .data;
+
+SECTIONS
+{
   .data.fuzz_ordered :
   {
       /*
@@ -34,6 +39,11 @@ SECTIONS
        */
        *(.bss._ZN6fuzzer3TPCE);
   }
+}
+INSERT AFTER .data.fuzz_start;
+
+SECTIONS
+{
   .data.fuzz_end : ALIGN(4K)
   {
       __FUZZ_COUNTERS_END = .;
@@ -43,4 +53,4 @@ SECTIONS
  * Don't overwrite the SECTIONS in the default linker script. Instead insert the
  * above into the default script
  */
-INSERT AFTER .data;
+INSERT AFTER .data.fuzz_ordered;