From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 13 Oct 2021 16:55:45 +0200
Subject: x86/process: Move arch_thread_struct_whitelist() out of line
Git-commit: 2dd8eedc80b184bb16aad697ae60367c5bf07299
Patch-mainline: v5.15 or v5.15-rc8 (next release)
References: jsc#SLE-18931

In preparation for dynamically enabled FPU features move the function
out of line as the goal is to expose less and not more information.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211013145322.869001791@linutronix.de
---
 arch/x86/include/asm/processor.h |  9 +++------
 arch/x86/kernel/fpu/core.c       | 10 ++++++++++
 arch/x86/kernel/fpu/internal.h   |  2 ++
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 4519d334bbdb..1bd3e8d05604 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -461,9 +461,6 @@ DECLARE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
 DECLARE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
 #endif	/* !X86_64 */
 
-extern unsigned int fpu_kernel_xstate_size;
-extern unsigned int fpu_user_xstate_size;
-
 struct perf_event;
 
 struct thread_struct {
@@ -537,12 +534,12 @@ struct thread_struct {
 	 */
 };
 
-/* Whitelist the FPU register state from the task_struct for hardened usercopy. */
+extern void fpu_thread_struct_whitelist(unsigned long *offset, unsigned long *size);
+
 static inline void arch_thread_struct_whitelist(unsigned long *offset,
 						unsigned long *size)
 {
-	*offset = offsetof(struct thread_struct, fpu.__fpstate.regs);
-	*size = fpu_kernel_xstate_size;
+	fpu_thread_struct_whitelist(offset, size);
 }
 
 static inline void
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 14560fda15c2..c6df97517ec8 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -404,6 +404,16 @@ int fpu_clone(struct task_struct *dst)
 	return 0;
 }
 
+/*
+ * Whitelist the FPU register state embedded into task_struct for hardened
+ * usercopy.
+ */
+void fpu_thread_struct_whitelist(unsigned long *offset, unsigned long *size)
+{
+	*offset = offsetof(struct thread_struct, fpu.__fpstate.regs);
+	*size = fpu_kernel_xstate_size;
+}
+
 /*
  * Drops current FPU state: deactivates the fpregs and
  * the fpstate. NOTE: it still leaves previous contents
diff --git a/arch/x86/kernel/fpu/internal.h b/arch/x86/kernel/fpu/internal.h
index e1d8a352f12d..5c4f71ff6ae9 100644
--- a/arch/x86/kernel/fpu/internal.h
+++ b/arch/x86/kernel/fpu/internal.h
@@ -2,6 +2,8 @@
 #ifndef __X86_KERNEL_FPU_INTERNAL_H
 #define __X86_KERNEL_FPU_INTERNAL_H
 
+extern unsigned int fpu_kernel_xstate_size;
+extern unsigned int fpu_user_xstate_size;
 extern struct fpstate init_fpstate;
 
 /* CPU feature check wrappers */