From: Ahmed Abd El Mawgood <ahmedsoliman0x666@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
rkrcmar@redhat.com, Jonathan Corbet <corbet@lwn.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
hpa@zytor.com, x86@kernel.org, kvm@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
ahmedsoliman0x666@gmail.com, Ovich00@gmail.com,
kernel-hardening@lists.openwall.com, nigel.edwards@hpe.com,
Boris Lukashev <blukashev@sempervictus.com>,
Hossam Hassan <7ossam9063@gmail.com>,
Ahmed Lotfy <A7med.lotfey@gmail.com>
Subject: [PATCH V4 1/5] KVM: X86: Memory ROE documentation
Date: Sun, 21 Oct 2018 00:21:23 +0200 [thread overview]
Message-ID: <20181020222127.6368-2-ahmedsoliman0x666@gmail.com> (raw)
In-Reply-To: <20181020222127.6368-1-ahmedsoliman0x666@gmail.com>
Following up with my previous threads on KVM assisted Anti rootkit
protections.
The current version doesn't address the attacks involving pages
remapping. It is still design in progress, nevertheless, it will be in
my later patch sets.
Signed-off-by: Ahmed Abd El Mawgood <ahmedsoliman0x666@gmail.com>
---
Documentation/virtual/kvm/hypercalls.txt | 31 ++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/Documentation/virtual/kvm/hypercalls.txt b/Documentation/virtual/kvm/hypercalls.txt
index da24c138c8d1..8af64d826f03 100644
--- a/Documentation/virtual/kvm/hypercalls.txt
+++ b/Documentation/virtual/kvm/hypercalls.txt
@@ -141,3 +141,34 @@ a0 corresponds to the APIC ID in the third argument (a2), bit 1
corresponds to the APIC ID a2+1, and so on.
Returns the number of CPUs to which the IPIs were delivered successfully.
+
+7. KVM_HC_ROE
+----------------
+Architecture: x86
+Status: active
+Purpose: Hypercall used to apply Read-Only Enforcement to guest memory and
+registers
+Usage 1:
+ a0: ROE_VERSION
+
+Returns non-signed number that represents the current version of ROE
+implementation current version.
+
+Usage 2:
+
+ a0: ROE_MPROTECT (requires version >= 1)
+ a1: Start address aligned to page boundary.
+ a2: Number of pages to be protected.
+
+This configuration lets a guest kernel have part of its read/write memory
+converted into read-only. This action is irreversible.
+Upon successful run, the number of pages protected is returned.
+
+Error codes:
+ -KVM_ENOSYS: system call being triggered from ring 3 or it is not
+ implemented.
+ -EINVAL: error based on given parameters.
+
+Notes: KVM_HC_ROE can not be triggered from guest Ring 3 (user mode). The
+reason is that user mode malicious software can make use of it to enforce read
+only protection on an arbitrary memory page thus crashing the kernel.
--
2.18.1
next prev parent reply other threads:[~2018-10-20 22:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-20 22:21 Read Only Enforcement patches V4 [VMM based kernel hardening] Ahmed Abd El Mawgood
2018-10-20 22:21 ` Ahmed Abd El Mawgood [this message]
2018-10-20 22:21 ` [PATCH V4 2/5] KVM: X86: Adding arbitrary data pointer in kvm memslot iterator functions Ahmed Abd El Mawgood
2018-10-20 22:21 ` [PATCH V4 3/5] KVM: X86: Adding skeleton for Memory ROE Ahmed Abd El Mawgood
2018-10-20 22:21 ` [PATCH V4 4/5] KVM: X86: Adding support for byte granular memory ROE Ahmed Abd El Mawgood
2018-10-20 22:21 ` [PATCH V4 5/5] KVM: Small Refactoring to kvm_free_memslot Ahmed Abd El Mawgood
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