linux-kernel - [tip: x86/sev] x86/boot: Revert "Reject absolute references in .head.text"

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Message-ID: <175698485140.1920.7820468106468532581.tip-bot2@tip-bot2>
Date: Thu, 04 Sep 2025 11:20:51 -0000
From: "tip-bot2 for Ard Biesheuvel" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: x86/sev] x86/boot: Revert "Reject absolute references in .head.text"

The following commit has been merged into the x86/sev branch of tip:

Commit-ID:     2578560d2259735d7d51364e7991ea92d85fd56c
Gitweb:        https://git.kernel.org/tip/2578560d2259735d7d51364e7991ea92d85fd56c
Author:        Ard Biesheuvel <ardb@...nel.org>
AuthorDate:    Thu, 28 Aug 2025 12:22:20 +02:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Wed, 03 Sep 2025 17:59:56 +02:00

x86/boot: Revert "Reject absolute references in .head.text"

This reverts commit

  faf0ed487415 ("x86/boot: Reject absolute references in .head.text")

The startup code is checked directly for the absence of absolute symbol
references, so checking the .head.text section in the relocs tool is no
longer needed.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/20250828102202.1849035-41-ardb+git@google.com
---
 arch/x86/tools/relocs.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index 5778bc4..e5a2b9a 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -740,10 +740,10 @@ static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
 static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
 		      const char *symname)
 {
-	int headtext = !strcmp(sec_name(sec->shdr.sh_info), ".head.text");
 	unsigned r_type = ELF64_R_TYPE(rel->r_info);
 	ElfW(Addr) offset = rel->r_offset;
 	int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
+
 	if (sym->st_shndx == SHN_UNDEF)
 		return 0;
 
@@ -783,12 +783,6 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
 			break;
 		}
 
-		if (headtext) {
-			die("Absolute reference to symbol '%s' not permitted in .head.text\n",
-			    symname);
-			break;
-		}
-
 		/*
 		 * Relocation offsets for 64 bit kernels are output
 		 * as 32 bits and sign extended back to 64 bits when