Messages in this thread Patch in this message | | | Date | Mon, 25 Mar 2019 15:09:36 -0700 | Subject | [PATCH 09/27] uswsusp: Disable when the kernel is locked down | From | Matthew Garrett <> |
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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> Reviewed-by: James Morris <james.l.morris@oracle.com> cc: linux-pm@vger.kernel.org Cc: pavel@ucw.cz Cc: rjw@rjwysocki.net Signed-off-by: Matthew Garrett <matthewgarrett@google.com> --- kernel/power/user.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/kernel/power/user.c b/kernel/power/user.c index 2d8b60a3c86b..0305d513c274 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)) { -- 2.21.0.392.gf8f6787159e-goog
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