Hi, I need to lock down kprobes under secure boot conditions as part of the patch series that can be found here:
https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=efi-lock-down Can you tell me that if the attached patch is sufficient to the cause? --- commit 9b736b76fbd7b23b54b4340e80c66f87df54016c Author: David Howells <dhowe...@redhat.com> Date: Wed Nov 8 16:14:12 2017 +0000 Lock down kprobes Disallow the creation of kprobes when the kernel is locked down. This patch restricts writing to /sys/kernel/debug/tracing/kprobe_events; writing to /sys/kernel/debug/kprobes/enabled is disabled by the patch that locks down debugfs. Signed-off-by: David Howells <dhowe...@redhat.com> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 8a907e12b6b9..b44f046d2582 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -907,6 +907,9 @@ static int probes_open(struct inode *inode, struct file *file) static ssize_t probes_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { + if (kernel_is_locked_down("Use of kprobes")) + return -EPERM; + return traceprobe_probes_write(file, buffer, count, ppos, create_trace_kprobe); }