1 files changed, 42 insertions, 0 deletions
diff --git a/tools/objtool/tests/generic/test-post-link.sh b/tools/objtool/tests/generic/test-post-link.sh
new file mode 100755
index 000000000000..a6d40ae1b18d
--- /dev/null
+++ b/tools/objtool/tests/generic/test-post-link.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# klp post-link converts the intermediate __klp_relocs.* sections into the
+# .klp.rela.* form the kernel applies at patch load.  Getting this wrong is
+# invisible at build time: the module links and loads, and the relocations are
+# simply never applied.
+
+. "$(dirname "$0")/../lib.sh"
+
+setup
+build_pair static_local.c
+
+# An unexported symbol is what produces a klp relocation in the first place.
+# The static local is renamed by the compiler -- counter.0 with gcc -- so the
+# fixture's premise is that some local of that shape exists, not that a symbol
+# called "counter" does.  Find it first; everything below names it.
+local_sym="$(in_symbols orig.o |
+	     awk '$4 == "OBJECT" && $5 == "LOCAL" && $8 ~ /counter/ { print $8; exit }')"
+[ -n "$local_sym" ] || fail "fixture produced no local 'counter' symbol"
+
+run_diff
+assert_section __klp_relocs.vmlinux
+
+# Nothing has converted them yet.
+assert_no_section ".klp.rela.vmlinux..text.target"
+
+# The original relocation is neutralised by pointing it at a tombstone, which
+# is what stops the module loader resolving it behind livepatch's back.
+#
+# Compilers mangle a static local differently -- gcc says counter.0, clang
+# target.counter -- so find what this one produced rather than assuming.
+assert_tombstone "$local_sym"
+
+run_post_link
+
+# One .klp.rela section per base section, carrying SHF_RELA_LIVEPATCH, against
+# a symbol in SHN_LIVEPATCH for the kernel to resolve.
+assert_klp_rela vmlinux .text.target
+assert_livepatch_sym "$local_sym"
+
+pass "klp relocations converted to .klp.rela with SHN_LIVEPATCH symbols"