[PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

From	David Howells <dhowells@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down
Date	2017-04-05 22:20 +0200
Message-ID	<tsZzk-7hF-23@gated-at.bofh.it> (permalink)
References	<tsZzj-7hF-5@gated-at.bofh.it>
Organization	Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903

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From: Josh Boyer <jwboyer@redhat.com>

This option allows userspace to pass the RSDP address to the kernel, which
makes it possible for a user to circumvent any restrictions imposed on
loading modules.  Ignore the option when the kernel is locked down.

Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-acpi@vger.kernel.org
---

 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 db78d353bab1..d4d4ba348451 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -192,7 +192,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
 	acpi_physical_address pa = 0;
 
 #ifdef CONFIG_KEXEC
-	if (acpi_rsdp)
+	if (acpi_rsdp && !kernel_is_locked_down())
 		return acpi_rsdp;
 #endif

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[PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel  has been locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
  Re: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel  has been locked down "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-06 21:50 +0200
    Re: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the  kernel has been locked down Dave Young <dyoung@redhat.com> - 2017-04-07 08:40 +0200
      Re: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down David Howells <dhowells@redhat.com> - 2017-04-07 09:10 +0200
        Re: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the  kernel has been locked down Dave Young <dyoung@redhat.com> - 2017-04-07 09:50 +0200

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