Patch "KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()" has been added to the 5.10-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-svm-flush-pages-under-kvm-lock-to-fix-uaf-in-svm_register_enc_region.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Fri, 16 Feb 2024 17:34:30 -0800
Subject: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

From: Sean Christopherson <seanjc@xxxxxxxxxx>

commit 5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807 upstream.

Do the cache flush of converted pages in svm_register_enc_region() before
dropping kvm->lock to fix use-after-free issues where region and/or its
array of pages could be freed by a different task, e.g. if userspace has
__unregister_enc_region_locked() already queued up for the region.

Note, the "obvious" alternative of using local variables doesn't fully
resolve the bug, as region->pages is also dynamically allocated.  I.e. the
region structure itself would be fine, but region->pages could be freed.

Flushing multiple pages under kvm->lock is unfortunate, but the entire
flow is a rare slow path, and the manual flush is only needed on CPUs that
lack coherency for encrypted memory.

Fixes: 19a23da53932 ("Fix unsynchronized access to sev members through svm_register_enc_region")
Reported-by: Gabe Kirkpatrick <gkirkpatrick@xxxxxxxxxx>
Cc: Josh Eads <josheads@xxxxxxxxxx>
Cc: Peter Gonda <pgonda@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Message-Id: <20240217013430.2079561-1-seanjc@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/kvm/svm/sev.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1024,20 +1024,22 @@ int svm_register_enc_region(struct kvm *
 		goto e_free;
 	}
 
-	region->uaddr = range->addr;
-	region->size = range->size;
-
-	list_add_tail(&region->list, &sev->regions_list);
-	mutex_unlock(&kvm->lock);
-
 	/*
 	 * The guest may change the memory encryption attribute from C=0 -> C=1
 	 * or vice versa for this memory range. Lets make sure caches are
 	 * flushed to ensure that guest data gets written into memory with
-	 * correct C-bit.
+	 * correct C-bit.  Note, this must be done before dropping kvm->lock,
+	 * as region and its array of pages can be freed by a different task
+	 * once kvm->lock is released.
 	 */
 	sev_clflush_pages(region->pages, region->npages);
 
+	region->uaddr = range->addr;
+	region->size = range->size;
+
+	list_add_tail(&region->list, &sev->regions_list);
+	mutex_unlock(&kvm->lock);
+
 	return ret;
 
 e_free:


Patches currently in stable-queue which might be from seanjc@xxxxxxxxxx are

queue-5.10/x86-cpu-support-amd-automatic-ibrs.patch
queue-5.10/kvm-always-flush-async-pf-workqueue-when-vcpu-is-bei.patch
queue-5.10/kvm-svm-flush-pages-under-kvm-lock-to-fix-uaf-in-svm_register_enc_region.patch