[PATCH 19/24] x86/mmiotrace: Lock down the testmmiotrace module

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The testmmiotrace module shouldn't be permitted when the kernel is locked
down as it can be used to arbitrarily read and write MMIO space.

Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx
cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
cc: Ingo Molnar <mingo@xxxxxxxxxx>
cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
cc: x86@xxxxxxxxxx
---

 arch/x86/mm/testmmiotrace.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/mm/testmmiotrace.c b/arch/x86/mm/testmmiotrace.c
index f6ae6830b341..bbaad357f5d7 100644
--- a/arch/x86/mm/testmmiotrace.c
+++ b/arch/x86/mm/testmmiotrace.c
@@ -115,6 +115,9 @@ static int __init init(void)
 {
 	unsigned long size = (read_far) ? (8 << 20) : (16 << 10);
 
+	if (kernel_is_locked_down("MMIO trace testing"))
+		return -EPERM;
+
 	if (mmio_address == 0) {
 		pr_err("you have to use the module argument mmio_address.\n");
 		pr_err("DO NOT LOAD THIS MODULE UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!\n");

--
To unsubscribe from this list: send the line "unsubscribe linux-api" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux