From 9a78f02d60d38e145c670e10cee56d881d1cdfc8 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 8 Nov 2017 16:14:12 +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 0026-Lock-down-kprobes.patch --- kernel/kprobes.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 4344381664c..5e986b2c32a 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1549,6 +1549,9 @@ 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