Commit ffdb07f3 authored Jul 10, 2019 by David Rientjes Committed by Thomas Gleixner Jul 16, 2019

x86/mm: Free sme_early_buffer after init



The contents of sme_early_buffer should be cleared after
__sme_early_enc_dec() because it is used to move encrypted and decrypted
data, but since __sme_early_enc_dec() is __init this buffer simply can be
freed after init.

This saves a page that is otherwise unreferenced after init.

Reported-by: Cfir Cohen <cfir@google.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1907101318170.197432@chino.kir.corp.google.com

parent e74bd969

arch/x86/mm/mem_encrypt.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -41,7 +41,7 @@ EXPORT_SYMBOL_GPL(sev_enable_key);
		bool sev_enabled __section(.data);

		/* Buffer used for early in-place encryption by BSP, no locking needed */
		static char sme_early_buffer[PAGE_SIZE] __aligned(PAGE_SIZE);
		static char sme_early_buffer[PAGE_SIZE] __initdata __aligned(PAGE_SIZE);

		/*
		* This routine does not change the underlying encryption setting of the