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Message-Id: <1378252218-18798-5-git-send-email-matthew.garrett@nebula.com>
Date: Tue, 3 Sep 2013 19:50:11 -0400
From: Matthew Garrett <matthew.garrett@...ula.com>
To: linux-kernel@...r.kernel.org
Cc: linux-efi@...r.kernel.org, keescook@...omium.org, hpa@...or.com,
Matthew Garrett <matthew.garrett@...ula.com>
Subject: [PATCH V3 04/11] ACPI: Limit access to custom_method
custom_method effectively allows arbitrary access to system memory, making
it possible for an attacker to circumvent restrictions on module loading.
Disable it if any such restrictions have been enabled.
Signed-off-by: Matthew Garrett <matthew.garrett@...ula.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 12b62f2..50647b3 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 (secure_modules())
+ return -EPERM;
+
if (!(*ppos)) {
/* parse the table header to get the table length */
if (count <= sizeof(struct acpi_table_header))
--
1.8.3.1
--
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