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Date: Fri, 7 Aug 2020 17:37:46 -0700 From: Cfir Cohen <cfir@...gle.com> To: "kvm @ vger . kernel . org" <kvm@...r.kernel.org>, Lendacky Thomas <thomas.lendacky@....com>, Singh Brijesh <brijesh.singh@....com> Cc: Grimm Jon <Jon.Grimm@....com>, David Rientjes <rientjes@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, Sean Christopherson <sean.j.christopherson@...el.com>, Vitaly Kuznetsov <vkuznets@...hat.com>, Wanpeng Li <wanpengli@...cent.com>, Jim Mattson <jmattson@...gle.com>, Joerg Roedel <joro@...tes.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org, linux-kernel@...r.kernel.org, Cfir Cohen <cfir@...gle.com> Subject: [PATCH v2] KVM: SVM: Mark SEV launch secret pages as dirty. The LAUNCH_SECRET command performs encryption of the launch secret memory contents. Mark pinned pages as dirty, before unpinning them. This matches the logic in sev_launch_update_data(). Signed-off-by: Cfir Cohen <cfir@...gle.com> --- Changelog since v1: - Updated commit message. arch/x86/kvm/svm/sev.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 5573a97f1520..37c47d26b9f7 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -850,7 +850,7 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp) struct kvm_sev_launch_secret params; struct page **pages; void *blob, *hdr; - unsigned long n; + unsigned long n, i; int ret, offset; if (!sev_guest(kvm)) @@ -863,6 +863,14 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp) if (!pages) return -ENOMEM; + /* + * The LAUNCH_SECRET command will perform in-place encryption of the + * memory content (i.e it will write the same memory region with C=1). + * It's possible that the cache may contain the data with C=0, i.e., + * unencrypted so invalidate it first. + */ + sev_clflush_pages(pages, n); + /* * The secret must be copied into contiguous memory region, lets verify * that userspace memory pages are contiguous before we issue command. @@ -908,6 +916,11 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp) e_free: kfree(data); e_unpin_memory: + /* content of memory is updated, mark pages dirty */ + for (i = 0; i < n; i++) { + set_page_dirty_lock(pages[i]); + mark_page_accessed(pages[i]); + } sev_unpin_memory(kvm, pages, n); return ret; } -- 2.28.0.236.gb10cc79966-goog
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