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Date: Thu, 9 Nov 2017 17:32:29 +0000 From: David Howells <dhowells@...hat.com> To: linux-security-module@...r.kernel.org Cc: gnomes@...rguk.ukuu.org.uk, linux-efi@...r.kernel.org, dhowells@...hat.com, linux-kernel@...r.kernel.org, jforbes@...hat.com Subject: [PATCH 15/30] 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> Reviewed-by: "Lee, Chun-Yi" <jlee@...e.com> cc: linux-acpi@...r.kernel.org --- 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..b33fba70ec51 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("ACPI custom methods")) + return -EPERM; + if (!(*ppos)) { /* parse the table header to get the table length */ if (count <= sizeof(struct acpi_table_header))
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