From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB850223322 for ; Thu, 28 May 2026 02:11:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779934280; cv=none; b=p6pY8ALOA0nHflQDSJ3kwedka+f9CGWuMG1lY21eOBsqIxQkKr9Qm/RiF479zpNH+ExTsm/usy4moCQvd4+Th002iX9CKIiTM7CykMLJHTyc3nbsqvfGBg7ismQoPKv18Zq8sYCVbt+CmFDMVC83Xr1VVjv0zIM60yEcVccXcLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779934280; c=relaxed/simple; bh=zu9tC4dLTq5vhYKmYNY1qmG/fVAVq9UjzeXLethNBf4=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=PCDMrwRx28Dh744+EdXgT18PfJgqDWZozQ/AJ9J3RA8glrRM/VeWwfgNGZrVmMq2avMN3kFl8Yki5S2XJWtUx8xzGaDACmVKwtdRhUCLL3A4FJHxdaVTgKrljZILGWStrSH/5CuId3mFtpvDppv4/umDI1MxnA8frhZta2ao8Us= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=rj4vfzN1; arc=none smtp.client-ip=209.85.214.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="rj4vfzN1" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2ba115ab6bbso136014135ad.3 for ; Wed, 27 May 2026 19:11:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1779934279; x=1780539079; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:reply-to:from:to:cc :subject:date:message-id:reply-to; bh=0Osslh/NSDWF9wssUZFP0lnMjWL7+sALKmBd0xwVb7o=; b=rj4vfzN1VxZ1Mvvj62Pno0fXLJBra3DmvW/qKDPSkiFrK9ONbUI77qm1nmgKaYD5+O +Sm2a746motLXX+6KVNRytlIv66uifzL72Jfxt4FUF5WVK9oBqOw9MC2bQH8wt+BLlzN 6P3wO6BEvA1/NOI29FU8V8wD43iVoldykwAkChFuUSJGz2cDHt1Sdo710CePGeifGz+V ZrOwxHCguxl2an5K6yjQ/LrKU5pP13AtTx46kUjQqCXj52ZxKrilxfyWP1eIaoviR08R wxIW2em9xsiLD7bZqqWSnRU/DJaPFKIbSVrq8qGNjsSXr8reHb4cA3Y4Z3l/BSaDnoZl euIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779934279; x=1780539079; h=cc:to:from:subject:message-id:mime-version:date:reply-to :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=0Osslh/NSDWF9wssUZFP0lnMjWL7+sALKmBd0xwVb7o=; b=kk8QzASKKXfBsolIKdH8sOebLi60qvfRi2ipsN4sRsYjxd74jxLAV9OwahEQQYJlOy yvRSW8CUlnGfZoD3GIiSAPtNI4a3ykQIOE1Ya8fjlAZliWN5FtuoiDAEn33V90C1zhB2 5X/Pbygjl0WUqzG3cDGHkw63e7Ivqe6wzIxz+pwT1VRqhRbtp+g7Pl5Kk8PL8uDA7cp2 lD9uxAEpdPwriVU+CdWO8mU71GX6Rfz7/hyVqhtdL77jDMjKM27um932C/TSp7F6SZR0 HME++UIXU6En8WSSsdgQz3VAChYNQbz/KzSb2ajgT5K6BwBIR/iWSReiMSnVBr/2T2Md DFdw== X-Forwarded-Encrypted: i=1; AFNElJ/+SWwXzIb7+8ofIsNKQNm/LcQbFQcEFvhxLzm4ernajYMOtQ/1JKzhDmg3GNEu/CktYGBl4XgwYkEo2so=@vger.kernel.org X-Gm-Message-State: AOJu0YyZa0gkf2EB8Go1rNLuatoC/mKykpq4Lqa2cnlCa9sfPs70lbln NoA8VJw3y+hLI6HE3XfIGk8mMtvmsFH9jkJBIuC5+np4QIAaCVJ1LR3uNtAmt4f2cgkgojDtSLk nxMi+iw== X-Received: from plky7.prod.google.com ([2002:a17:902:7007:b0:2bd:9a1:9a05]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:3c6b:b0:2ae:450c:951e with SMTP id d9443c01a7336-2beb070376fmr275589015ad.17.1779934278864; Wed, 27 May 2026 19:11:18 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 27 May 2026 19:11:14 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.54.0.794.g4f17f83d09-goog Message-ID: <20260528021117.107984-1-seanjc@google.com> Subject: [PATCH v3 0/3] KVM: guest_memfd: Fix signed offset+size goof From: Sean Christopherson To: Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Ackerley Tng , Sean Christopherson Content-Type: text/plain; charset="UTF-8" Fix a bug where KVM fails to reject a comically large offset into guest_memfd if offset+size results in a signed, negative value. Add a testcase to prove the bug, and to serve as a regression test. Note, v1 and v2 was part of larger series. v3: - Use uoff_t, not u64. [the combined might of Sean and Ackerley] - Explaining exactly what is broken. [Ackerley] - Add a regression test. v2: https://lore.kernel.org/all/20260522-fix-sev-gmem-post-populate-v2-0-3f196bfad5a1@google.com v1: https://lore.kernel.org/r/20260522-fix-sev-gmem-post-populate-v1-0-9fc8d6437b65@google.com Sean Christopherson (3): KVM: guest_memfd: Treat memslot binding offset+size as unsigned values KVM: selftests: Expand the guest_memfd test macros to allow passing the VM KVM: selftests: Add guest_memfd regression test signed offset+size bug .../testing/selftests/kvm/guest_memfd_test.c | 24 +++++++++++++++++-- virt/kvm/guest_memfd.c | 8 +++---- virt/kvm/kvm_mm.h | 7 ++++-- 3 files changed, 31 insertions(+), 8 deletions(-) base-commit: 9f2a49c511cb05b85745e1578e4fd425bff87f58 -- 2.54.0.794.g4f17f83d09-goog