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AKwUvBwKJRCkRQ4QyS2W1neMP7TMYwkB8zQLYRCPNywMlwjstYXP55bqn8LA5NFGjoHJ1QGCIYi1jk7aHGOSHJU=@vger.kernel.org X-Gm-Message-State: AFuF++mmgTXFcuiNBZbw0zYoe/G7yAsEqjpb4hUspGVTAPx9W5gH348z 4DPD0eDOnt3wRpEusNZERw2po2jrE2YiEcaoalcIBIYGN7YCqCUFzw1EvRTIbzDESlnzxAZr48O eQsaHoqcZXX1rig== X-Received: from dlak8.prod.google.com ([2002:a05:701b:2908:b0:13f:9a34:1f84]) (user=cmllamas job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2551:b0:37d:f983:7b5 with SMTP id 98e67ed59e1d1-396d0fe384cmr60584271a91.9.1788280524517; Tue, 01 Sep 2026 09:35:24 -0700 (PDT) Date: Tue, 1 Sep 2026 16:35:13 +0000 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 2.55.0.966.g6673acef38-goog Message-ID: <20260901163521.1355535-1-cmllamas@google.com> Subject: [PATCH v3 0/5] binder: fix issues with mremap() From: Carlos Llamas Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, Suren Baghdasaryan , Carlos Llamas Content-Type: text/plain; charset="UTF-8" This is a follow up series fixing some pre-existing issues found by sashiko during a review of an unrelated patchset here: https://sashiko.dev/#/patchset/20260813193433.3318288-1-surenb@google.com The goal is to safely reject mremap() requests on binder's vma to prevent pages from temporary leaking and accidental IPC tear-down. -- v3: - Switch to a range-check in vm_ops->close() and protect against partial munmap() as Sashiko points out. v2: - Set VM_DONTEXPAND in [1/5] and [2/5] per Sashiko's feedback. - Check vma->vm_start to prevent incorrect ->close() in [3/5] per Sashiko's feedback. https://lore.kernel.org/all/20260901030419.470246-1-cmllamas@google.com/ v1: https://lore.kernel.org/all/20260831224145.169403-1-cmllamas@google.com/ Carlos Llamas (5): binder: set VM_DONTEXPAND rust_binder: set VM_DONTEXPAND binder: check vma->vm_start in binder_vma_close() binder: reject mremap() rust_binder: reject mremap() drivers/android/binder.c | 13 ++++++++++++- drivers/android/binder/page_range.rs | 15 ++++++++++++--- drivers/android/binder/process.rs | 1 + 3 files changed, 25 insertions(+), 4 deletions(-) -- 2.55.0.966.g6673acef38-goog