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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/x86/kernel/relocate_kernel_32.S
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@@ -1,18 +1,18 @@
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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) 2002-2004 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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 #include <asm/page_types.h>
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 #include <asm/kexec.h>
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+#include <asm/nospec-branch.h>
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 #include <asm/processor-flags.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 << 2)
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@@ -37,8 +37,7 @@
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 #define CP_PA_BACKUP_PAGES_MAP	DATA(0x1c)
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 	.text
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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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 	/* Save the CPU context, used for jumping back */
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 	pushl	%ebx
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@@ -94,9 +93,12 @@
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 	movl    %edi, %eax
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 	addl    $(identity_mapped - relocate_kernel), %eax
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 	pushl   %eax
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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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 	/* set return address to 0 if not preserving context */
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 	pushl	$0
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 	/* store the start address on the stack */
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@@ -161,12 +163,15 @@
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 	xorl    %edx, %edx
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 	xorl    %esi, %esi
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 	xorl    %ebp, %ebp
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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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 	popl	%edx
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 	movl	CP_PA_SWAP_PAGE(%edi), %esp
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 	addl	$PAGE_SIZE, %esp
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 2:
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+	ANNOTATE_RETPOLINE_SAFE
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 	call	*%edx
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 	/* get the re-entry point of the peer system */
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@@ -192,9 +197,12 @@
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 	movl	%edi, %eax
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 	addl	$(virtual_mapped - relocate_kernel), %eax
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 	pushl	%eax
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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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 	movl	CR4(%edi), %eax
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 	movl	%eax, %cr4
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 	movl	CR3(%edi), %eax
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@@ -209,10 +217,13 @@
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 	popl	%edi
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 	popl	%esi
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 	popl	%ebx
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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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 	movl	8(%esp), %edx
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 	movl	4(%esp), %ecx
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 	pushl	%ebp
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@@ -271,7 +282,10 @@
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 	popl	%edi
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 	popl	%ebx
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 	popl	%ebp
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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