linux-kernel - [PATCH 10/11] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment

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: <1346774117-2277-11-git-send-email-mjg@redhat.com>
Date:	Tue,  4 Sep 2012 11:55:16 -0400
From:	Matthew Garrett <mjg@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	Josh Boyer <jwboyer@...hat.com>
Subject: [PATCH 10/11] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment

From: Josh Boyer <jwboyer@...hat.com>

This option allows userspace to pass the RSDP address to the kernel.  This
could potentially be used to circumvent the secure boot trust model.
We ignore the setting if we don't have the CAP_SECURE_FIRMWARE capability.

Signed-off-by: Josh Boyer <jwboyer@...hat.com>
---
 drivers/acpi/osl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 9eaf708..50c94e4 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -246,7 +246,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
 acpi_physical_address __init acpi_os_get_root_pointer(void)
 {
 #ifdef CONFIG_KEXEC
-	if (acpi_rsdp)
+	if (acpi_rsdp && capable(CAP_SECURE_FIRMWARE))
 		return acpi_rsdp;
 #endif
 
-- 
1.7.11.4

--
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/