From 6ee97734f0e52ce67ba513734622a1d305a4d059 Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 18 Feb 2019 12:45:02 +0000 Subject: [PATCH] Lock down kprobes Disallow the creation of kprobes when the kernel is locked down by preventing their registration. This prevents kprobes from being used to access kernel memory, either to make modifications or to steal crypto data. Reported-by: Alexei Starovoitov Signed-off-by: David Howells Gbp-Pq: Topic features/all/lockdown Gbp-Pq: Name 0024-Lock-down-kprobes.patch --- kernel/kprobes.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 445337c107e..c7192c65bfb 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1556,6 +1556,9 @@ int register_kprobe(struct kprobe *p) struct module *probed_mod; kprobe_opcode_t *addr; + if (kernel_is_locked_down("Use of kprobes")) + return -EPERM; + /* Adjust probe address from symbol */ addr = kprobe_addr(p); if (IS_ERR(addr)) -- 2.30.2