| Date | Fri, 21 Jun 2019 17:03:44 -0700 | Subject | [PATCH V34 15/29] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down | From | Matthew Garrett <> |
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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 modify the workings of hardware . Reject the option when the kernel is locked down.
Signed-off-by: Josh Boyer <jwboyer@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Matthew Garrett <mjg59@google.com> cc: Dave Young <dyoung@redhat.com> cc: linux-acpi@vger.kernel.org --- drivers/acpi/osl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index f29e427d0d1d..60cda8a0f36b 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -40,6 +40,7 @@ #include <linux/list.h> #include <linux/jiffies.h> #include <linux/semaphore.h> +#include <linux/security.h> #include <asm/io.h> #include <linux/uaccess.h> @@ -194,7 +195,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void) acpi_physical_address pa; #ifdef CONFIG_KEXEC - if (acpi_rsdp) + if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) return acpi_rsdp; #endif pa = acpi_arch_get_root_pointer(); -- 2.22.0.410.gd8fdbe21b5-goog
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