From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (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 DFE0F13FD86 for ; Thu, 23 Jan 2025 16:49:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737650954; cv=none; b=UZrYchzmxNz4zh+lJckgI037b/sW8JBQCg3dL3AyNLMKi9Tm8IMftoiSJ2J+BGYp4+x5GEZA4mmiEMrq/BqIB+Xz+wRpActQFpexo/CehDcLeO1Zkwzvgnp+pvbMrMMDpyH8LAju+n2ZpxV1JFMK2mrWbfwkFJhy6UMkinX2bDQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737650954; c=relaxed/simple; bh=hYLucHQ2GmvyYGM25CegMuMOk06ntWJcKyymmU5cPNY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=e/2KiH1+ImBYetsIq3lHVX4k5Q6wkH5ryjOxi7lGPRtrIOCigYAjzgjatP6bDMSpqvGulGSU2C7LDBlHUueKv7ZM3jakbn5WXqBwfyy7HvGKfy+CN6LNPba8VVY7Ceul7jSS1Pnqgei+zvdjQyk8/8BFWqPvF6Eyur0PtNP68N8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=IvIsJGoq; arc=none smtp.client-ip=209.85.214.178 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=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="IvIsJGoq" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-215740b7fb8so220995ad.0 for ; Thu, 23 Jan 2025 08:49:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1737650952; x=1738255752; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=p8Ktjkvm7S5NoXz/Y7DuB0HrZMbc1D1VpyZ2582WTxM=; b=IvIsJGoqepVok4tD+hN8J2tEjle2QwzJiLG34Avvl4Plnc2OABhaS2Xl0+yjjF++MP bq6IfuZVyV+3UTt/L1NzoKt5MWTWxRUhex11Ta1Ypn93p1d5e8maV+Z1M1W9hZ5IA7c/ NCh01KtUOjKzYW9FJ9zgoRguZ4jpcxWfAwQ5Z4vFbdva3l0uFXdqyekoTBI8XaR3l4G9 /gAyE6Udz33zs1JtsBKbPIg69w5lBph/ItfS29TTml15QrQfq4CpD/aDVGPgfBIcNOz5 agg9DL3nzagN71i1I4SBMMkMUcrTLPcLCuGm4qHC3Q0fB63FqhsaIZWbCNWoCKEmuNG8 Ijmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737650952; x=1738255752; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=p8Ktjkvm7S5NoXz/Y7DuB0HrZMbc1D1VpyZ2582WTxM=; b=UJ+u7unZ+TyzLgx2dWDzbOQd1XyZgoaLgTO4Mh+jMOymv1fhPo40MmrkDy1qC474fk jq/BUM0du3tv9C2FN8sXfE7IBXgiCxlu+EhfeIL/gk5QlL+YkM+yQwNjpVteWZQn9nyT /Vx8RTWYcQXhvAqZT9+rAhLlbc+4Ezw1ymv7QGzwuRIxz59FACA132cNvDjNiIaVT/BH 8trGxcexCWlq8sWf97wEkj+6r4zv70NU04B/u2HmmsFirE7mZwv/4H3HUS5KRJqwqhGQ fGJ3d2xzU21niwIK7V0EzZxTd0k05+qljCz3PJM0MVgE+yhixic/SZo5MSXlUA5RXgHz 7TlQ== X-Forwarded-Encrypted: i=1; AJvYcCVSRAS1mYevZ3EbhKGXMVKw70VfEPfVXGsqi6ibzwWrHHuOyVBBk6akOlh9sHCNLFT9QagK7Xz+tl37pq0=@vger.kernel.org X-Gm-Message-State: AOJu0Yx8wm3eHJveT8Fi95he4TdQbIQgpzxjLdLy/fWIL/3wnrs37JAu 1zxQ3U8sFldMcvI0ZzDSzKNaE7idP0c5+4JCmaznDTZxsYQj+J/kC73qnwYE6w== X-Gm-Gg: ASbGncuG4NVGa+RNZvvmG8Dn7kIoXH6SrKraNzNzuItV/mZiuU9IwCzNIBT68hrtqOb 9kdm9EYvcxcmbnrhNIjw5HHGI/2fhL9H8x8HQTeT+IBPu/sH1q+51Pq4qRt5SjLQLUVuKXtoUwN OuxJgtWdhOEEqaVVodI5+XGbVlpJpj/rZKwqOqibTVe7zF17LIuf4ej7USntIzSRvBmv1CNsOJQ Et4+ZpedozG5GB5H03ZP+VsTHxDUEzJDZZPueFv1qM6v3Qsuy7mPKeORZWxwgWWf/AguFczUG77 78AONKUbh7XN+A+aVs50Zv2F3Vq/z2MgQH5Ig1JeRyo= X-Google-Smtp-Source: AGHT+IEdI9sfswL1CKpgteGUTpoa8KzLTHDzZUTd6md5ndqBYJhxcQogQX/2Fh+WAvAdK1DX0CjY5w== X-Received: by 2002:a17:902:ce0a:b0:215:7ced:9d67 with SMTP id d9443c01a7336-21d99cfa7a8mr3019815ad.24.1737650951932; Thu, 23 Jan 2025 08:49:11 -0800 (PST) Received: from google.com (57.145.233.35.bc.googleusercontent.com. [35.233.145.57]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21da3d9e38esm1259485ad.3.2025.01.23.08.49.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jan 2025 08:49:11 -0800 (PST) Date: Thu, 23 Jan 2025 16:49:07 +0000 From: Carlos Llamas To: Aleksandr Nogikh Cc: syzbot , Li Li , arve@android.com, brauner@kernel.org, gregkh@linuxfoundation.org, joel@joelfernandes.org, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, maco@android.com, sfr@canb.auug.org.au, surenb@google.com, syzkaller-bugs@googlegroups.com, tkjos@android.com Subject: Re: [syzbot] [kernel?] linux-next test error: KASAN: slab-use-after-free Write in binder_add_device Message-ID: References: <6788e8a3.050a0220.20d369.0031.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Jan 23, 2025 at 01:32:29PM +0100, Aleksandr Nogikh wrote: > The problem began to appear after: > > commit 12d909cac1e1c4147cc3417fee804ee12fc6b984 > Author: Li Li > Date: Wed Dec 18 13:29:34 2024 -0800 > > binderfs: add new binder devices to binder_devices > Correct. I tried to mark this commit with a #syz blame or something but I couldn't find anything. The problem here is we add binderfs devices to the binder_devices list but we don't remove them when these are kfreed e.g. during umount. This is then fairly easy to reproduce, something like: $ mount -t binder binder /dev/binderfs $ umount /dev/binderfs $ mount -t binder binder /dev/binderfs It should be a simply fix. I'll send a patch later today. Thanks, -- Carlos Llamas