tests: add testcase for PT_PHDR VirtAddr corruption

A PT_PHDR corruption was previously reported and fixed in [1]: the issue was
that the VirtAddr field of the PT_PHDR program header would get overwritten
with the file offset of the program header table rather than the virtual
address. A testcase for this was also added in [2]. However, the tescase is not
included in the Makefile.am regression testsuite and also tries to run a x86_64
prebuilt binary unconditionally, which would not work on other architectures.

To fix this, create a standalone testcase for the PT_PHDR VirtAddr field
corruption and include it in Makefile.am. In order to reproduce [1], a binary
with the following characteristics is needed:
- the ELF file type must be ET_DYN
- the ELF file must contain a PT_PHDR program header
- the file offset and the VirtAddr field of the PT_PHDR program header must be
  different

[1] https://github.com/NixOS/patchelf/pull/243
[2] https://github.com/NixOS/patchelf/commit/8f94e116f3c63afe224f1ec48ccad6f068f835df

Signed-off-by: Ovidiu Panait <ovpanait@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/phdr-corruption.ld b/tests/phdr-corruption.ld
new file mode 100644
index 0000000..6cf322c
--- /dev/null
+++ b/tests/phdr-corruption.ld
@@ -0,0 +1,16 @@
+PHDRS
+{
+  headers PT_PHDR PHDRS;
+  text PT_LOAD FILEHDR PHDRS;
+  interp PT_INTERP ;
+}
+
+SECTIONS
+{
+  . = SIZEOF_HEADERS;
+  . = ALIGN(4);
+
+  . = . + 0x1000;
+  .interp : { *(.interp) } :text :interp
+  .text : { *(.text) } :text
+}