linux-kernel - [PATCH] x86/power/64: Avoid memory corruption in 64-bit swsusp_arch

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Message-ID: <2755592.YNNOVbNgS2@vostro.rjw.lan>
Date:	Sat, 18 Jun 2016 01:33:47 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	mingo@...nel.org
Cc:	sds@...ho.nsa.gov, logang@...tatee.com, keescook@...omium.org,
	tglx@...utronix.de, luto@...nel.org, peterz@...radead.org,
	hpa@...or.com, torvalds@...ux-foundation.org, bp@...en8.de,
	linux-pm@...r.kernel.org, rafael.j.wysocki@...el.com,
	brgerst@...il.com, dvlasenk@...hat.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86/power/64: Avoid memory corruption in 64-bit swsusp_arch_resume()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Commit 70595b479ce1 (x86/power/64: Fix crash whan the hibernation
code passes control to the image kernel) forgot to update the last
argument of memcpy() in swsusp_arch_resume() to reflect the other
changes made by it and that may lead to memory corruption if the
core_restore_code code happens to be located at the end of a page,
so fix it.

Fixes: 70595b479ce1 (x86/power/64: Fix crash whan the hibernation code passes control to the image kernel)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

Commit 70595b479ce1 is in tip and linux-next now.

---
 arch/x86/power/hibernate_64.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux-pm/arch/x86/power/hibernate_64.c
===================================================================
--- linux-pm.orig/arch/x86/power/hibernate_64.c
+++ linux-pm/arch/x86/power/hibernate_64.c
@@ -142,8 +142,7 @@ int swsusp_arch_resume(void)
 	relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
 	if (!relocated_restore_code)
 		return -ENOMEM;
-	memcpy(relocated_restore_code, &core_restore_code,
-	       &restore_registers - &core_restore_code);
+	memcpy(relocated_restore_code, &core_restore_code, PAGE_SIZE);
 
 	restore_image();
 	return 0;