[16/30] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

Commit Message

David Howells Nov. 9, 2017, 5:32 p.m. UTC

From: Josh Boyer <[e-mail]>

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 <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
Reviewed-by: "Lee, Chun-Yi" <[e-mail]>
cc: Dave Young <[e-mail]>
cc: [e-mail]
---

 drivers/acpi/osl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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Patch

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index db78d353bab1..36c6527c1b0a 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("ACPI RSDP specification"))
 		return acpi_rsdp;
 #endif