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AJvYcCUg1fSuo9T+zwSJoffeCx6DafBI0AuTWgiVHIWf1UmX/BIhIje6bPRnOleVCAWeZwOVklCbXKsI/D2opJY=@vger.kernel.org X-Gm-Message-State: AOJu0YwJddkKPLVGYAedBom8bEAUEGy3i50gCICdQqk1MutwWtLZkc9R FJ0Ihg5kJaC6QDLpOG49XOdLSPx/eK+DwXVnUaCJ9OPKSJTEzn29Yb88f0HLQVD76m2LOr5AwF/ plQ== X-Google-Smtp-Source: AGHT+IGntiLPaNNzeAfuu6/TEmKwPAvoTiJFX2SO6583j9CN5As5xvpXTmf/fSQgTUKQrOus8R97PMQPQe4= X-Received: from pfbch14.prod.google.com ([2002:a05:6a00:288e:b0:727:3a40:52cd]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:3a85:b0:1e1:c8f5:19ee with SMTP id adf61e73a8af0-1e5e04945e8mr2117339637.25.1734658750347; Thu, 19 Dec 2024 17:39:10 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 19 Dec 2024 17:38:59 -0800 In-Reply-To: <20241220013906.3518334-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241220013906.3518334-1-seanjc@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241220013906.3518334-2-seanjc@google.com> Subject: [PATCH 1/8] KVM: selftests: Fix mostly theoretical leak of VM's binary stats FD From: Sean Christopherson To: Marc Zyngier , Oliver Upton , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson , Paolo Bonzini Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When allocating and freeing a VM's cached binary stats info, check for a NULL descriptor, not a '0' file descriptor, as '0' is a legal FD. E.g. in the unlikely scenario the kernel installs the stats FD at entry '0', selftests would reallocate on the next __vm_get_stat() and/or fail to free the stats in kvm_vm_free(). Fixes: 83f6e109f562 ("KVM: selftests: Cache binary stats metadata for durat= ion of test") Signed-off-by: Sean Christopherson --- tools/testing/selftests/kvm/lib/kvm_util.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/sel= ftests/kvm/lib/kvm_util.c index 33fefeb3ca44..91d295ef5d02 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -749,7 +749,7 @@ void kvm_vm_free(struct kvm_vm *vmp) return; =20 /* Free cached stats metadata and close FD */ - if (vmp->stats_fd) { + if (vmp->stats_desc) { free(vmp->stats_desc); close(vmp->stats_fd); } @@ -2218,7 +2218,7 @@ void __vm_get_stat(struct kvm_vm *vm, const char *sta= t_name, uint64_t *data, size_t size_desc; int i; =20 - if (!vm->stats_fd) { + if (!vm->stats_desc) { vm->stats_fd =3D vm_get_stats_fd(vm); read_stats_header(vm->stats_fd, &vm->stats_header); vm->stats_desc =3D read_stats_descriptors(vm->stats_fd, --=20 2.47.1.613.gc27f4b7a9f-goog