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authorMatthew Garrett <mjg59@srcf.ucam.org>2019-08-20 02:17:50 +0200
committerJames Morris <jmorris@namei.org>2019-08-20 06:54:16 +0200
commitf474e1486b78ac15322f8a1cda48a32a1deff9d3 (patch)
treefe775561f6ce6e2a47ec9b837d398e5ab987efdd /include
parentx86/msr: Restrict MSR access when the kernel is locked down (diff)
downloadlinux-f474e1486b78ac15322f8a1cda48a32a1deff9d3.tar.xz
linux-f474e1486b78ac15322f8a1cda48a32a1deff9d3.zip
ACPI: Limit access to custom_method when the kernel is locked down
custom_method effectively allows arbitrary access to system memory, making it possible for an attacker to circumvent restrictions on module loading. Disable it if the kernel is locked down. Signed-off-by: Matthew Garrett <mjg59@google.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org> cc: linux-acpi@vger.kernel.org Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/security.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/security.h b/include/linux/security.h
index 010637a79eac..390e39395112 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -110,6 +110,7 @@ enum lockdown_reason {
LOCKDOWN_PCI_ACCESS,
LOCKDOWN_IOPORT,
LOCKDOWN_MSR,
+ LOCKDOWN_ACPI_TABLES,
LOCKDOWN_INTEGRITY_MAX,
LOCKDOWN_CONFIDENTIALITY_MAX,
};