From nobody Wed Dec 17 21:14:16 2025 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (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 912262E0B6D for ; Fri, 3 Oct 2025 23:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759533997; cv=none; b=HlTKc6fGUqWrv97qGsdmQY5hi9cK82Q34vVfX17mPEpV+0I+0PyhpHgCtmilyo3xBmgIWlrhC7O3JXFhbjKJn22HDFmf9Qgii4BK9XXZFkG4TZoPqzcyxisd2XRw1+pJDiGYkuA6IkZvqI02ROMxO6Y27OXI1nHWfcNitv0f7II= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759533997; c=relaxed/simple; bh=A35jNQC/Y3RxjqGBQN1sEn/RRSyfIzES/2AECjIpxI0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=oq3v6pdW7PSH3Abr+EWKwuEYlN+Xftatz8DyOrWnUZsU+Te3heMxnYBkPJicW1hx82BCfgV44nsw3sAHKVrtCdi42O3xy3VlKJXfpvfL8LuZ3R3sBgWjYFD/6GUY3q0z5DBrdMgSndyO6RWITgaSp5si/BEAxg25kge5eFDsnUg= 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=o0OPp5Rg; arc=none smtp.client-ip=209.85.210.201 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="o0OPp5Rg" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-77f5e6a324fso4425762b3a.0 for ; Fri, 03 Oct 2025 16:26:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1759533995; x=1760138795; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=ZziZ37GNo1v+A7DeH1fg1jRwXSNmJJcf2TnA0oS/lkM=; b=o0OPp5Rg6ks8tA1BePwlhBcQ6fU1NJh63XbxX3KeDdCKHstkPfuDmTI1mXqXdMeSd7 BQtqvjd5vqhb0waGIdR3gBuADdZC4diam2Sjp4UbOV/7H6JDwjNRi6fj1Lf8uY5xtfz/ 6H/EDQTF2i8EHVBOqnNVLSr0xNHwxCCoiC2jv/iRa7qx4FSZ1FMj1ne69VyAcws8eY2Q Z5/pqhNwS9jyqKQZNSSz/UnZVDMwNP4s1H0cNsrA2SmHbzd5Q+1nDHVNQQ07d0ZmTsm+ /jS/h3XkPHsICCK3MWFIA/rmlVjo7EwZxT8cCyr4tCzqleBtKtVh6nO2f/dF/NgWlt41 QIuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759533995; x=1760138795; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ZziZ37GNo1v+A7DeH1fg1jRwXSNmJJcf2TnA0oS/lkM=; b=UtA6Aj9ERDYyju0Zt1B0OH/QTpO27YYz6JW/quXb4EyfiAql0dtyypA6FOKNnIBoC7 wjz6CNGVuQ//X1mv7L4gI6pDSmPX1PFuztFVCx6jZnA4E321U/Ex+x1dnjCUObn1FeD5 dpVIlGa1KmO2A2HCJhbAu3kzIQn6KRmOJbuUcPemtiUdea94+Bowjx9Q873wQi6EdFHv t8EPFF3Cj+KX6zpXMsHfEBwQPu0gZiCIyCoHe96wgC+xcMHEvHAmqOxUgc0FYjPmKsM/ FEZ9EVPR8B8wlmA+n50YW3uwsLHtUO9FdhDyYszRXLvcLiyHvtcdOVYWTNKoxDW29sut d8FA== X-Forwarded-Encrypted: i=1; AJvYcCVPyiuDKkOzZEv8JxNcB6NDoQg/g40ml0OfaV0ctWavtGxi/iEXuVHLeWx2RzsgE7DpM9/ahTum+6GTFAU=@vger.kernel.org X-Gm-Message-State: AOJu0Yx8GbIttRM9hPLXEg6rCel+et7moU47GOzgTwI3Uv+1TOsHuiNQ IZli76bIb17HAf591gFfAbDdfhpSjHToB52joyfNijREso37ucuxnV8zWhx/vLCg6fbDEFnEFTD gcJnXBg== X-Google-Smtp-Source: AGHT+IGI45fASbGk78+EH7g4G06WAQxAWAI94Pfy4l7ikWrEGD/iRpekgctqMyc+R3oC7uyXtSz62tBnv3w= X-Received: from pfjd14.prod.google.com ([2002:a05:6a00:244e:b0:781:1b2a:49c9]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:1301:b0:781:19e1:c4c8 with SMTP id d2e1a72fcca58-78c98a6a5e1mr5790329b3a.9.1759533994969; Fri, 03 Oct 2025 16:26:34 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 3 Oct 2025 16:26:06 -0700 In-Reply-To: <20251003232606.4070510-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251003232606.4070510-1-seanjc@google.com> X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251003232606.4070510-14-seanjc@google.com> Subject: [PATCH v2 13/13] KVM: selftests: Verify that reads to inaccessible guest_memfd VMAs SIGBUS From: Sean Christopherson To: Paolo Bonzini , Sean Christopherson , Christian Borntraeger , Janosch Frank , Claudio Imbrenda Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, David Hildenbrand , Fuad Tabba , Ackerley Tng Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Expand the guest_memfd negative testcases for overflow and MAP_PRIVATE to verify that reads to inaccessible memory also get a SIGBUS. Opportunistically fix the write path to use the "val" instead of hardcoding the literal value a second time, and to use TEST_FAIL(...) instead of TEST_ASSERT(false, ...). Signed-off-by: Sean Christopherson Reviewed-by: Ackerley Tng Reviewed-by: Lisa Wang Tested-by: Ackerley Tng Tested-by: Lisa Wang --- tools/testing/selftests/kvm/guest_memfd_test.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing= /selftests/kvm/guest_memfd_test.c index f5372fdf096d..e7d9aeb418d3 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -84,6 +84,7 @@ static void test_fault_sigbus(int fd, size_t accessible_s= ize, size_t map_size) mem =3D kvm_mmap(map_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd); =20 TEST_EXPECT_SIGBUS(memset(mem, val, map_size)); + TEST_EXPECT_SIGBUS((void)READ_ONCE(mem[accessible_size])); =20 for (i =3D 0; i < accessible_size; i++) TEST_ASSERT_EQ(READ_ONCE(mem[i]), val); --=20 2.51.0.618.g983fd99d29-goog