linux-kernel - [PATCH 3/5] efi arm64: do not enter virtual mode in case booting with efi=noruntime or noefi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1407823822-23829-3-git-send-email-dyoung@redhat.com>
Date:	Tue, 12 Aug 2014 14:10:20 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Matt Fleming <matt.fleming@...el.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Mark Salter <msalter@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-efi@...r.kernel.org, rtc-linux@...glegroups.com
Subject: [PATCH 3/5] efi arm64: do not enter virtual mode in case booting with efi=noruntime or noefi

In case efi runtime disabled via noefi kernel cmdline arm64_enter_virtual_mode
should error out.

At the same time move early_memunmap(memmap.map, mapsize) to the beginning of
the function or it will leak early mem.

Signed-off-by: Dave Young <dyoung@...hat.com>
---
 arch/arm64/kernel/efi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index e72f310..324cdd1 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -386,7 +386,10 @@ static int __init arm64_enter_virtual_mode(void)
 	int count = 0;
 	unsigned long flags;
 
-	if (!efi_enabled(EFI_BOOT)) {
+	mapsize = memmap.map_end - memmap.map;
+	early_memunmap(memmap.map, mapsize);
+
+	if (!efi_enabled(EFI_BOOT) || efi_runtime_disabled()) {
 		pr_info("EFI services will not be available.\n");
 		return -1;
 	}
@@ -394,8 +397,6 @@ static int __init arm64_enter_virtual_mode(void)
 	pr_info("Remapping and enabling EFI services.\n");
 
 	/* replace early memmap mapping with permanent mapping */
-	mapsize = memmap.map_end - memmap.map;
-	early_memunmap(memmap.map, mapsize);
 	memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
 						   mapsize);
 	memmap.map_end = memmap.map + mapsize;
-- 
1.8.3.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/