[PATCH 09/27] uswsusp: Disable when the kernel is locked down
From: jlee@suse.com (joeyli)
Date: 2017-10-20 06:41:24
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On Thu, Oct 19, 2017 at 03:51:42PM +0100, David Howells wrote:
From: Matthew Garrett <mjg59@srcf.ucam.org> uswsusp allows a user process to dump and then restore kernel state, which makes it possible to modify the running kernel. Disable this if the kernel is locked down. Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-pm at vger.kernel.org
I have reviewed and tested this patch. Please feel free to add: Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com> Thanks a lot! Joey Lee
quoted hunk ↗ jump to hunk
--- kernel/power/user.c | 3 +++ 1 file changed, 3 insertions(+)diff --git a/kernel/power/user.c b/kernel/power/user.c index 22df9f7ff672..678ade9decfe 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c@@ -52,6 +52,9 @@ static int snapshot_open(struct inode *inode, struct file *filp) if (!hibernation_available()) return -EPERM; + if (kernel_is_locked_down("/dev/snapshot")) + return -EPERM; + lock_system_sleep(); if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { --To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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