Fix mips plt sections being clobbered (#485)

* do not clobber plt sections that are previously found

* fix mips test for plt on checkbytes

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

cle/backends/elf/metaelf.py

@@ -149,7 +149,7 @@ def _load_plt(self):
         if ".plt.got" in self.sections_map:
             plt_secs = [self.sections_map[".plt.got"]]
         if ".MIPS.stubs" in self.sections_map:
-            plt_secs = [self.sections_map[".MIPS.stubs"]]
+            plt_secs.append(self.sections_map[".MIPS.stubs"])
         if ".plt.sec" in self.sections_map:
             plt_secs.append(self.sections_map[".plt.sec"])
 

tests/test_plt.py

@@ -26,7 +26,14 @@ def _check_plt_entries(self, filename):
             self.assertEqual(diffs, [4] * len(diffs))
             return
 
-        # all our mips samples have no PLT, just resolver stubs
+        if filename == os.path.join("mips", "checkbyte"):
+            self.assertEqual(
+                ld.main_object.plt,
+                {"read": 0x4008C0, "puts": 0x4008D0, "__libc_start_main": 0x4008E0},
+            )
+            return
+
+        # remaining mips samples have no PLT, just resolver stubs
         if filename.startswith("mips"):
             self.assertEqual(ld.main_object.plt, {})
             return