[PATCH] x86/efi: skip bgrt init for kexec reboot

From	Dave Young <dyoung@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH] x86/efi: skip bgrt init for kexec reboot
Date	2016-01-27 12:30 +0100
Message-ID	<qVwsp-2JC-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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For kexec reboot the bgrt image address could contains random data because
we have freed boot service areas in 1st kernel boot phase. One possible
result is kmalloc fail in efi_bgrt_init due to large random image size.

So change efi_late_init to avoid efi_bgrt_init in case kexec boot.

Signed-off-by: Dave Young <dyoung@redhat.com>
---
 arch/x86/platform/efi/efi.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-x86.orig/arch/x86/platform/efi/efi.c
+++ linux-x86/arch/x86/platform/efi/efi.c
@@ -531,7 +531,8 @@ void __init efi_init(void)
 
 void __init efi_late_init(void)
 {
-	efi_bgrt_init();
+	if (!efi_setup)
+		efi_bgrt_init();
 }
 
 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)

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[PATCH] x86/efi: skip bgrt init for kexec reboot Dave Young <dyoung@redhat.com> - 2016-01-27 12:30 +0100

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