diff mbox

[RFC] Lock down kprobes

Message ID 26979.1510241470@warthog.procyon.org.uk (mailing list archive)
State New, archived
Headers show

Commit Message

David Howells Nov. 9, 2017, 3:31 p.m. UTC
So this?

Thanks,
David
---
commit b5bb759d5e7f99c357b82b8066a9106b817de965
Author: David Howells <dhowells@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 by
    preventing their registration.
    
    Signed-off-by: David Howells <dhowells@redhat.com>

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Comments

David Howells Nov. 9, 2017, 4:43 p.m. UTC | #1
I've extended the description and will repost.

David
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diff mbox

Patch

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index a1606a4224e1..f06023b0936c 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1530,6 +1530,9 @@  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))