Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri,  7 Dec 2018 14:48:01 +0200
From: Ahmed Abd El Mawgood <ahmedsoliman@...a.vt.edu>
To: Paolo Bonzini <pbonzini@...hat.com>,
	rkrcmar@...hat.com,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	hpa@...or.com,
	x86@...nel.org,
	kvm@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ahmedsoliman0x666@...il.com,
	ovich00@...il.com,
	kernel-hardening@...ts.openwall.com,
	nigel.edwards@....com,
	Boris Lukashev <blukashev@...pervictus.com>,
	Igor Stoppa <igor.stoppa@...il.com>
Cc: Ahmed Abd El Mawgood <ahmedsoliman@...a.vt.edu>
Subject: [PATCH 08/10] KVM: X86: Port ROE_MPROTECT_CHUNK to x86

Apply d->memslot->partial_roe_bitmap to shadow page table entries
too.

Signed-off-by: Ahmed Abd El Mawgood <ahmedsoliman@...a.vt.edu>
---
 arch/x86/kvm/roe.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/roe.c b/arch/x86/kvm/roe.c
index f787106be8..700f69823b 100644
--- a/arch/x86/kvm/roe.c
+++ b/arch/x86/kvm/roe.c
@@ -25,11 +25,14 @@ static bool __rmap_write_protect_roe(struct kvm *kvm,
 	struct rmap_iterator iter;
 	bool prot;
 	bool flush = false;
+	void *full_bmp =  memslot->roe_bitmap;
+	void *part_bmp = memslot->partial_roe_bitmap;
 
 	for_each_rmap_spte(rmap_head, &iter, sptep) {
 		int idx = spte_to_gfn(sptep) - memslot->base_gfn;
 
-		prot = !test_bit(idx, memslot->roe_bitmap) && pt_protect;
+		prot = !(test_bit(idx, full_bmp) || test_bit(idx, part_bmp));
+		prot = prot && pt_protect;
 		flush |= spte_write_protect(sptep, prot);
 	}
 	return flush;
-- 
2.19.2

Powered by blists - more mailing lists

Your e-mail address:

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.