From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f200.google.com (mail-pg1-f200.google.com [209.85.215.200]) (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 887A3414A1D for ; Tue, 1 Sep 2026 03:04:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788231867; cv=none; b=Bdwy3CZ3nPuNX5dZhZ9QkrEGeKOUKMNKyG42SvdrdeHj416jT26qlPAiCv9vNKmUliY4XqRG4xbqio/E0xsz6fxWh/FNix5Rpeztx7mEeqjLpENrXO0R7mX3/W8Xh32ZCiUcrF7xIqkb/LYfZ9G6HD84yrvJdL/akjOOfk3KJJE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788231867; c=relaxed/simple; bh=QaT3nycN1nU+767e6gGU2hQy4Jh8Zmp8/ztDqnMyiNU=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=fn7e/I+ythSAr88qtK/d/slqwwNyLRehbpIfmMi2bWosZLq3ykehgbnaPgZmA8gdJ+8QCE0dfdsCGD5TlTYToLveGnfO1qhT4RNRwggXLRIgSbLnT97uuFMMgdem5JkXLfu6XH64zcOYgy6bk0WxWN1fcGmUeU0tEOJWY3JIgyk= 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=rGrP46m0; arc=none smtp.client-ip=209.85.215.200 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="rGrP46m0" Received: by mail-pg1-f200.google.com with SMTP id 41be03b00d2f7-cbb92868263so3717456a12.2 for ; Mon, 31 Aug 2026 20:04:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1788231866; x=1788836666; 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=j4kY4yMnAUzFdJb35gMXcen7Y7r8uKRQU8t9+ieisNw=; b=rGrP46m0mv9VyZK3ltDaSaLMchOP69AJMxy1d3MFvw5r+kanjEhD2iG08J79/Qs2YQ 3Qu8Hn6fcqgfXfzo7KyokBAU/fM2qrz5mzdkckY0uathI/RVmZLMYugNYmaid+z9OvX8 YdMlJtV8Tf3M+3DUgL6+PXa99kELizb8qxKBI9zZzmiSOewdnh2hP0W4wGZF1TgxucR1 pYoXZZGQU7LuY5g4FHaD9xAvLyTMhxCfIMems4sE50nDSktDt2Jk4jBPjUsmG1mzmoTL YgDpMx7awRl3sKa2q+oXlq32IMglo3CWjeOaM9np76z2HIns4Y3j3mkyNL7cpFpADTOv Tjsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788231866; x=1788836666; 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=j4kY4yMnAUzFdJb35gMXcen7Y7r8uKRQU8t9+ieisNw=; b=YxElO1fG184/kt/gZo6D3eFCQkNyWiokyavZt8QS88OdyH+4IgvGXy1upVD/lDgsi4 3h3Ng3H56JycQHtIqMQa71MrZH4ePtJ1lr7vsbLlBsF1XHRHBn9PbVO2U2pnfT4xFOtU QRra2ysV/NMwQSV3+UEwPSe0sjNDhoKuZDgfnA6SKNidLHZU/QyEKnfXYNOOm1Jbkyby I9eEAP+bz25MqNio5o7zTjG4bI30OZOQIRcla/HiMnU6DKgUiKPnE7taddDN5xXKNsMW /jzCV5QVmEFyRg7UDvRaMEJSBIsSiVGQzf6EJU39uvS024AvBMUjyhzedq02PvHBL0y2 12Jg== X-Forwarded-Encrypted: i=1; AHgh+RpEIhJHVflIOQ+qatstAQCZgRx99oca86LWOh6hU4PFEi/hXFKZhBcUmBogtzgyBgx+B8BCJKc2b6SVji4=@vger.kernel.org X-Gm-Message-State: AFuF++kof3OfeIR43HY9v/O6o20rpBhZGR4+VhEUeepJ7sHLA2VvMskY OW1GLqGD4knZr40RGnhxxRYk4oXEl2jI/sNMkxPJby9cUSMfoZcjM8zPs5vLqngXt535j8zbkUG Xysr3iiFDBeT2zw== X-Received: from dybgl8.prod.google.com ([2002:a05:7300:e008:b0:322:9543:a5f9]) (user=cmllamas job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:2d2c:b0:3d1:39e9:b261 with SMTP id adf61e73a8af0-3d7aacd026bmr8048089637.0.1788231865714; Mon, 31 Aug 2026 20:04:25 -0700 (PDT) Date: Tue, 1 Sep 2026 03:04:14 +0000 In-Reply-To: <20260901030419.470246-1-cmllamas@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260901030419.470246-1-cmllamas@google.com> X-Mailer: git-send-email 2.55.0.897.gb25b4bd76c-goog Message-ID: <20260901030419.470246-4-cmllamas@google.com> Subject: [PATCH v2 3/5] binder: check vma->vm_start in binder_vma_close() 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" Certain operations like a failed mremap() might trigger vm_ops->close() on temporary mappings. To avoid tearing-down the main binder mapping on these, let's verify that the VMA matches the expected starting address. Cc: stable@vger.kernel.org Fixes: 457b9a6f09f0 ("Staging: android: add 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.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 1b492ed48ea6..3ec3a77af106 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -6018,6 +6018,9 @@ static void binder_vma_close(struct vm_area_struct *vma) { struct binder_proc *proc = vma->vm_private_data; + if (vma->vm_start != proc->alloc.vm_start) + return; + binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", proc->pid, vma->vm_start, vma->vm_end, -- 2.55.0.897.gb25b4bd76c-goog