linux-hardening - [PATCH] x86, relocs: Ignore relocations in .notes section on walk

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Date: Sun, 17 Mar 2024 23:05:47 +0800
From: Guixiong Wei <weiguixiong@...edance.com>
To: keescook@...omium.org,
	tglx@...utronix.de
Cc: jgross@...e.com,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	peterz@...radead.org,
	gregkh@...uxfoundation.org,
	tony.luck@...el.com,
	adobriyan@...il.com,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	weiguixiong@...edance.com
Subject: [PATCH] x86, relocs: Ignore relocations in .notes section on walk_relocs

The commit aaa8736370db ("x86, relocs: Ignore relocations in
.notes section") only ignore .note section on print_absolute_relocs,
but it also need to add on walk_relocs to avoid relocations in .note
section.

Fixes: aaa8736370db ("x86, relocs: Ignore relocations in .notes section")
Fixes: 5ead97c84fa7 ("xen: Core Xen implementation")
Fixes: da1a679cde9b ("Add /sys/kernel/notes")
Signed-off-by: Guixiong Wei <weiguixiong@...edance.com>
---
 arch/x86/tools/relocs.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index b029fb81ebee..33844b33b8b9 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -746,6 +746,16 @@ static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
 		if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
 			continue;
 		}
+
+		/*
+		 * Do not perform relocations in .notes section; any
+		 * values there are meant for pre-boot consumption (e.g.
+		 * startup_xen).
+		 */
+		if (sec_applies->shdr.sh_type == SHT_NOTE) {
+			continue;
+		}
+
 		sh_symtab = sec_symtab->symtab;
 		sym_strtab = sec_symtab->link->strtab;
 		for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
-- 
2.24.3 (Apple Git-128)