[PATCH v5 30/36] x86/build: Assert for unwanted sections

[Kees Cook]

In preparation for warning on orphan sections, enforce other
expected-to-be-zero-sized sections (since discarding them might hide
problems with them suddenly gaining unexpected entries).

Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 arch/x86/kernel/vmlinux.lds.S | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 7faffe7414d6..d8792f9c536f 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -415,6 +415,15 @@ SECTIONS
 
 	DISCARDS
 
+	/*
+	 * Sections that should stay zero sized, which is safer to
+	 * explicitly check instead of blindly discarding.
+	 */
+	.got (NOLOAD) : {
+		*(.got) *(.igot.*)
+	}
+	ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!")
+
 	/*
 	 * Make sure that the .got.plt is either completely empty or it
 	 * contains only the lazy dispatch entries.
@@ -427,6 +436,21 @@ SECTIONS
 	       SIZEOF(.got.plt) == 0xc,
 #endif
 	       "Unexpected GOT/PLT entries detected!")
+
+	.plt (NOLOAD) : {
+		*(.plt) *(.plt.*) *(.iplt)
+	}
+	ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
+
+	/* ld.lld does not like .rel* sections being made "NOLOAD". */
+	.rel.dyn : {
+		*(.rel.*) *(.rel_*)
+	}
+	ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!")
+	.rela.dyn : {
+		*(.rela.*) *(.rela_*)
+	}
+	ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
 }
 
 #ifdef CONFIG_X86_32
-- 
2.25.1