[COMMITTED] tests: elfcopy --reverse-offs should only swap sections next to each other.

[Mark Wielaard <mark@klomp.org>]

The run-reverse-sections-self.sh (which really should have been called
"swap-sections") could fail if the ELF file had sections that were not
directly next to each other swapped. Add a check to make sure the swapped
sections are actually directly next to each other.

Signed-off-by: Mark Wielaard <mark@klomp.org>
---
 tests/ChangeLog | 5 +++++
 tests/elfcopy.c | 1 +
 2 files changed, 6 insertions(+)

diff --git a/tests/ChangeLog b/tests/ChangeLog
index b4877db..e038793 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,8 @@
+2019-06-03  Mark Wielaard  <mark@klomp.org>
+
+	* elfcopy.c (copy_elf): When swapping the sh_offsets of two sections,
+	make sure they are actually next to each other.
+
 2019-05-12  Mark Wielaard  <mark@klomp.org>
 
 	* Makefile.am (check_PROGRAMS): Add elfrdwrnop.
diff --git a/tests/elfcopy.c b/tests/elfcopy.c
index d457bad..4542222 100644
--- a/tests/elfcopy.c
+++ b/tests/elfcopy.c
@@ -225,6 +225,7 @@ copy_elf (const char *in, const char *out, bool use_mmap, bool reverse_offs)
 	      && shdr.sh_addralign == 1
 	      && last_shdr.sh_type != SHT_NOBITS
 	      && shdr.sh_type != SHT_NOBITS
+	      && last_shdr.sh_offset + last_shdr.sh_size == shdr.sh_offset
 	      && (phnum == 0
 		  || ((shdr.sh_flags & SHF_ALLOC) == 0
 		      && (last_shdr.sh_flags & SHF_ALLOC) == 0)))
-- 
1.8.3.1