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Date: Wed, 16 Nov 2016 21:48:43 +0000 From: David Howells <dhowells@...hat.com> To: keyrings@...r.kernel.org Cc: dhowells@...hat.com, matthew.garrett@...ula.com, linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 12/16] ACPI: Limit access to custom_method when the kernel is locked down From: Matthew Garrett <matthew.garrett@...ula.com> 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 <matthew.garrett@...ula.com> Signed-off-by: David Howells <dhowells@...hat.com> --- drivers/acpi/custom_method.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c index c68e72414a67..e4d721c330c0 100644 --- a/drivers/acpi/custom_method.c +++ b/drivers/acpi/custom_method.c @@ -29,6 +29,9 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf, struct acpi_table_header table; acpi_status status; + if (kernel_is_locked_down()) + return -EPERM; + if (!(*ppos)) { /* parse the table header to get the table length */ if (count <= sizeof(struct acpi_table_header))
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