[PATCH] x86, efi: Fix 32-bit fallout

[Borislav Petkov]

From: Borislav Petkov <bp@xxxxxxx>

We do not enable the new efi memmap on 32-bit and thus we need to run
runtime_code_page_mkexec() unconditionally there. Fix that.

Reported-and-tested-by: Lejun Zhu <lejun.zhu@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v3.14+
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
 arch/x86/include/asm/efi.h     | 2 ++
 arch/x86/platform/efi/efi.c    | 8 +++-----
 arch/x86/platform/efi/efi_32.c | 6 ++++++
 arch/x86/platform/efi/efi_64.c | 9 +++++++++
 4 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index d3c099f53ff2..7fd9830285e0 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -133,6 +133,8 @@ extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 extern void __init old_map_region(efi_memory_desc_t *md);
 extern void __init efi_dump_pagetable(void);
+extern void __init runtime_code_page_mkexec(void);
+extern void __init efi_runtime_mkexec(void);
 
 struct efi_setup_data {
 	u64 fw_vendor;
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 0c8672b3f9a3..40e62ea52864 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -776,7 +776,7 @@ void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 		set_memory_nx(addr, npages);
 }
 
-static void __init runtime_code_page_mkexec(void)
+void __init runtime_code_page_mkexec(void)
 {
 	efi_memory_desc_t *md;
 	void *p;
@@ -1024,8 +1024,7 @@ static void __init kexec_enter_virtual_mode(void)
 	efi.update_capsule = virt_efi_update_capsule;
 	efi.query_capsule_caps = virt_efi_query_capsule_caps;
 
-	if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
-		runtime_code_page_mkexec();
+	efi_runtime_mkexec();
 
 	/* clean DUMMY object */
 	efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
@@ -1125,8 +1124,7 @@ static void __init __efi_enter_virtual_mode(void)
 	efi.update_capsule = virt_efi_update_capsule;
 	efi.query_capsule_caps = virt_efi_query_capsule_caps;
 
-	if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
-		runtime_code_page_mkexec();
+	efi_runtime_mkexec();
 
 	/*
 	 * We mapped the descriptor array into the EFI pagetable above but we're
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c
index 7ad87ee09525..9ee3491e31fb 100644
--- a/arch/x86/platform/efi/efi_32.c
+++ b/arch/x86/platform/efi/efi_32.c
@@ -82,3 +82,9 @@ void efi_call_phys_epilog(void)
 
 	local_irq_restore(efi_rt_eflags);
 }
+
+void __init efi_runtime_mkexec(void)
+{
+	if (__supported_pte_mask & _PAGE_NX)
+		runtime_code_page_mkexec();
+}
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index 0998f3a536ff..50cc39be2271 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -268,3 +268,12 @@ void __init efi_dump_pagetable(void)
 	ptdump_walk_pgd_level(NULL, pgd);
 #endif
 }
+
+void __init efi_runtime_mkexec(void)
+{
+	if (!efi_enabled(EFI_OLD_MEMMAP))
+		return;
+
+	if (__supported_pte_mask & _PAGE_NX)
+		runtime_code_page_mkexec();
+}
-- 
1.8.5.2.192.g7794a68

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