linux-kernel - [RFC PATCH 1/3] x86, boot: Move setup_bios_corruption

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]

Date:	Mon, 11 Nov 2013 16:16:45 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Olof Johansson <olof@...om.net>,
	"H. Peter Anvin" <hpa@...ux.intel.com>, <stable@...r.kernel.org>
Subject: [RFC PATCH 1/3] x86, boot: Move setup_bios_corruption_check() later

From: "H. Peter Anvin" <hpa@...ux.intel.com>

setup_bios_corruption_check() tries to claim any low memory regions
that we haven't already reserved.  Make sure we reserve any low memory
regions that we intend to either use or know/assume a priori is bad
*before* we initialize the checker.

Stable team note: adding this to the list to consider for stable
because it generates user-visible nuisance dmesg warnings in some
configurations.  However, it is not urgent and should be allowed to
percolate in Linus' tree for a bit first.

Reported-by: Olof Johansson <olof@...om.net>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Link: http://lkml.kernel.org/r/528168CB.7070602@linux.intel.com
Cc: <stable@...r.kernel.org> v3.9+ [not urgent]
---
 arch/x86/kernel/setup.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index f0de629..8c01d6e 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1080,10 +1080,6 @@ void __init setup_arch(char **cmdline_p)
 	/* preallocate 4k for mptable mpc */
 	early_reserve_e820_mpc_new();
 
-#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
-	setup_bios_corruption_check();
-#endif
-
 #ifdef CONFIG_X86_32
 	printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
 			(max_pfn_mapped<<PAGE_SHIFT) - 1);
@@ -1100,6 +1096,14 @@ void __init setup_arch(char **cmdline_p)
 
 	setup_real_mode();
 
+	/*
+	 * At this point we should have reserved any low memory regions
+	 * we need to reserve.
+	 */
+#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
+	setup_bios_corruption_check();
+#endif
+
 	memblock_set_current_limit(get_max_mapped());
 	dma_contiguous_reserve(0);
 
-- 
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/