From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f72.google.com (mail-pj1-f72.google.com [209.85.216.72]) (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 8B45648124F for ; Tue, 1 Sep 2026 16:35:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788280530; cv=none; b=s+Tn6u5/6CVyCsBw2Gt7m3+NDtW49hujv16+a/Ey/mr/3+cEiNZe3i/C4OtuLc+jF1/QC59dmspMkwnh55WDGPxUK0J9Var3q7Gbss87O3gzysOyAjtwNHYp8R22VghDZeM/Dggw1zncZS6qGV2HGwk38CCIKcTRx2pCUhEb/AE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788280530; c=relaxed/simple; bh=Q3w+fqnn1Odo3u33vSDwy+efpfwvyQRtuduW7bjVVNs=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=tIfVE3/YjoWVxJ/ceWGqtot/qkgjMX1SxBtP8fK2PlOYBeoE4+IWX+idSoYG3K1So7jhQqGGdLz3Pw+HVoZDDAcwVAwfqQ4TfY3hnVjJVL/Fh2RqyvpmXUnzhAhVoz9vG2N/LxYlAPryA3aykeRDA5yfC2cevVn0SQuRnjp5NRs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--cmllamas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=HTuJ2vnZ; arc=none smtp.client-ip=209.85.216.72 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--cmllamas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="HTuJ2vnZ" Received: by mail-pj1-f72.google.com with SMTP id 98e67ed59e1d1-396901263b6so7014a91.2 for ; Tue, 01 Sep 2026 09:35:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1788280528; x=1788885328; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=7ro8mTU0e+ibPxFysuMqboUdneRfJQUV4jga1NJ1RSo=; b=HTuJ2vnZM2PvqUN+B7/j4+UrD23gZi6rqd3NE7rQfapiv9TUd7LuExYrZcE4CZQLuY h1B5v2FIWotb3ZOlqRLooF/vtRVU/k/gSM6Yi+bMMhVrNSVJFllsJ14xBxuTLszMBPol s4Z8LtBxwBZcJDTYF1Ekly7lp6iRuLbGrU9s/sIPCxKz4Vn+Z3yQRJZYaKdOZWoW+Bxj reFrKGvYiKGT9DuFOoC/Fs5AeHq0naYS7TIv1VfDv+lzymyxjkYcGFa9xiq/igAH+xPm /Sokq98YWtziB2rG2KTSey/wwaFJnflhijx0G23Ky3ZY0LLbkz5A2HsNNk9T38GnQEYc +0iA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788280528; x=1788885328; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=7ro8mTU0e+ibPxFysuMqboUdneRfJQUV4jga1NJ1RSo=; b=IA2miIr6UU+5clxF+j0ybGgrAMhMSPgkZMdzJDOuFanFOUq77Ly6EmAee9zC4iD0qN NDAoDN2gLd6k66LkwrJVKrCn7odbRxuOziXTSPXt5KfjdJDQVYJa1Yi92OKOoVyx/4uh Nbt+IyZ/kP5wKv1NoQ5+yd3sxurSoIlpi/0/MX+F4nCbNPR7sH3nJQVjyFatDXQAteGT SoqUCXOzmDjg0RS2YgixOh1eusNMq9/JmwcJpGhpamJh7amOoBRR1UPWsDTISAvLNfl1 txpT2atlsWFOgYocoC/zQzb7hVS/0F3BM3ZtS8/QECToArT6YYt76gAmDNA0ZsziQSIv 7uvg== X-Forwarded-Encrypted: i=1; AKwUvByK8tVLvIHuRk2Xsh77i2adLQ8ByJfR5pgaNpsdjCuzUTkpYRX6oiXnRP7VGWbqRoIsBfHPGBNwHksKZY4=@vger.kernel.org X-Gm-Message-State: AFuF++lzYbs+ToJuDOoA2BvqMW+p21EsXv7KC7OSvq8W588jshkWXgUe mLMjtjmgaKqtw40l1fLynnwOjUWZMS2om2iMeXMEjMitf0JrmM2wUicWubkwqVIgyY7/ReByUaI Mfa1aJoE0ssp3ZQ== X-Received: from dlbro7.prod.google.com ([2002:a05:7022:1587:b0:141:4b64:a042]) (user=cmllamas job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:528f:b0:38e:9eb2:9d43 with SMTP id 98e67ed59e1d1-39907e113f5mr15291291a91.16.1788280527477; Tue, 01 Sep 2026 09:35:27 -0700 (PDT) Date: Tue, 1 Sep 2026 16:35:15 +0000 In-Reply-To: <20260901163521.1355535-1-cmllamas@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260901163521.1355535-1-cmllamas@google.com> X-Mailer: git-send-email 2.55.0.966.g6673acef38-goog Message-ID: <20260901163521.1355535-3-cmllamas@google.com> Subject: [PATCH v3 2/5] rust_binder: set VM_DONTEXPAND From: Carlos Llamas To: Greg Kroah-Hartman , "=?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?=" , Todd Kjos , Christian Brauner , Carlos Llamas , Alice Ryhl Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, Suren Baghdasaryan , stable@vger.kernel.org, Sashiko Content-Type: text/plain; charset="UTF-8" Binder does not support expanding VMAs. It uses the original size to create its RangeAllocator during mmap() and expanding the VMA would only result in a wasted virtual range. Set the VM_DONTEXPAND flag to prevent the vma from being expanded via mremap(). Cc: stable@vger.kernel.org Fixes: eafedbc7c050 ("rust_binder: add Rust Binder driver") Reported-by: Sashiko Closes: https://sashiko.dev/#/patchset/20260831224145.169403-1-cmllamas%40google.com?part=1 Signed-off-by: Carlos Llamas --- drivers/android/binder/process.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/android/binder/process.rs b/drivers/android/binder/process.rs index 5372bfbd93b3..9038f3d13cfd 100644 --- a/drivers/android/binder/process.rs +++ b/drivers/android/binder/process.rs @@ -1786,6 +1786,7 @@ pub(crate) fn mmap( vma.try_clear_maywrite().map_err(|_| EPERM)?; vma.set_dontcopy(); vma.set_mixedmap(); + vma.set_dontexpand(); // TODO: Set ops. We need to learn when the user unmaps so that we can stop using it. this.create_mapping(vma) -- 2.55.0.966.g6673acef38-goog