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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/x86/kernel/relocate_kernel_64.S
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@@ -1,9 +1,7 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * relocate_kernel.S - put the kernel image in place to boot
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  * Copyright (C) 2002-2005 Eric Biederman  <ebiederm@xmission.com>
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- *
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- * This source code is licensed under the GNU General Public License,
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- * Version 2.  See the file COPYING for more details.
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  */
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 #include <linux/linkage.h>
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@@ -11,9 +9,12 @@
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 #include <asm/kexec.h>
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 #include <asm/processor-flags.h>
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 #include <asm/pgtable_types.h>
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+#include <asm/nospec-branch.h>
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+#include <asm/unwind_hints.h>
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 /*
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- * Must be relocatable PIC code callable as a C function
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+ * Must be relocatable PIC code callable as a C function, in particular
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+ * there must be a plain RET and not jump to return thunk.
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  */
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 #define PTR(x) (x << 3)
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@@ -40,8 +41,8 @@
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 	.text
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 	.align PAGE_SIZE
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 	.code64
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-	.globl relocate_kernel
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-relocate_kernel:
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+SYM_CODE_START_NOALIGN(relocate_kernel)
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+	UNWIND_HINT_EMPTY
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 	/*
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 	 * %rdi indirection_page
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 	 * %rsi page_list
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@@ -104,9 +105,13 @@
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 	/* jump to identity mapped page */
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 	addq	$(identity_mapped - relocate_kernel), %r8
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 	pushq	%r8
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+	ANNOTATE_UNRET_SAFE
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 	ret
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+	int3
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+SYM_CODE_END(relocate_kernel)
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-identity_mapped:
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+SYM_CODE_START_LOCAL_NOALIGN(identity_mapped)
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+	UNWIND_HINT_EMPTY
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 	/* set return address to 0 if not preserving context */
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 	pushq	$0
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 	/* store the start address on the stack */
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@@ -189,19 +194,19 @@
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 	xorl	%r14d, %r14d
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 	xorl	%r15d, %r15d
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+	ANNOTATE_UNRET_SAFE
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 	ret
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+	int3
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 1:
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 	popq	%rdx
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 	leaq	PAGE_SIZE(%r10), %rsp
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+	ANNOTATE_RETPOLINE_SAFE
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 	call	*%rdx
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 	/* get the re-entry point of the peer system */
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 	movq	0(%rsp), %rbp
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-	call	1f
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-1:
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-	popq	%r8
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-	subq	$(1b - relocate_kernel), %r8
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+	leaq	relocate_kernel(%rip), %r8
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 	movq	CP_PA_SWAP_PAGE(%r8), %r10
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 	movq	CP_PA_BACKUP_PAGES_MAP(%r8), %rdi
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 	movq	CP_PA_TABLE_PAGE(%r8), %rax
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@@ -210,9 +215,13 @@
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 	call	swap_pages
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 	movq	$virtual_mapped, %rax
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 	pushq	%rax
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+	ANNOTATE_UNRET_SAFE
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 	ret
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+	int3
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+SYM_CODE_END(identity_mapped)
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-virtual_mapped:
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+SYM_CODE_START_LOCAL_NOALIGN(virtual_mapped)
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+	UNWIND_HINT_EMPTY
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 	movq	RSP(%r8), %rsp
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 	movq	CR4(%r8), %rax
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 	movq	%rax, %cr4
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@@ -229,10 +238,14 @@
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 	popq	%r12
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 	popq	%rbp
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 	popq	%rbx
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+	ANNOTATE_UNRET_SAFE
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 	ret
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+	int3
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+SYM_CODE_END(virtual_mapped)
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 	/* Do the copies */
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-swap_pages:
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+SYM_CODE_START_LOCAL_NOALIGN(swap_pages)
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+	UNWIND_HINT_EMPTY
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 	movq	%rdi, %rcx 	/* Put the page_list in %rcx */
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 	xorl	%edi, %edi
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 	xorl	%esi, %esi
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@@ -284,7 +297,10 @@
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 	lea	PAGE_SIZE(%rax), %rsi
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 	jmp	0b
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 3:
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+	ANNOTATE_UNRET_SAFE
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 	ret
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+	int3
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+SYM_CODE_END(swap_pages)
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 	.globl kexec_control_code_size
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 .set kexec_control_code_size, . - relocate_kernel