From 72aab8f096f65d9fb9e4516b58cffeea404f94ad Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Tue, 21 May 2024 10:42:12 +0800 Subject: [PATCH] KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region() mainline inclusion from mainline-v6.8 commit 5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9Q8ZA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807 -------------------------------- 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 Cc: Josh Eads Cc: Peter Gonda Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson Message-Id: <20240217013430.2079561-1-seanjc@google.com> Signed-off-by: Paolo Bonzini Signed-off-by: Ye Bin --- arch/x86/kvm/svm/sev.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index e7d27c2863ec..b39d725077af 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1027,20 +1027,22 @@ int svm_register_enc_region(struct kvm *kvm, goto e_free; } - region->uaddr = range->addr; - region->size = range->size; - - list_add_tail(®ion->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(®ion->list, &sev->regions_list); + mutex_unlock(&kvm->lock); + return ret; e_free: -- Gitee