From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (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 A743322E49 for ; Tue, 13 Jun 2023 20:46:56 +0000 (UTC) Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-1b3a6469623so22350935ad.3 for ; Tue, 13 Jun 2023 13:46:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1686689216; x=1689281216; 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=UU2W1Yd3b/N1bxttJwHZMPKGDdWn1+63RfP3dSCBBR4=; b=bAZ8pdO/DxdY6zDe8daGd9jbKgSBR2wTKN+h+1X22YogYqUPNT4I78n15bPFBQ2Qie d8nBcepCW8TdqSPQS6v8H+pYQYNqVZS0r2ubI4BOzwLN+126Je4Yi1tKtAWaAcy8vmrq XmgdpIH/9XO5lgOlOBMZPJT8W/gNTxR1kXJYU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686689216; x=1689281216; 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=UU2W1Yd3b/N1bxttJwHZMPKGDdWn1+63RfP3dSCBBR4=; b=Z+OUCQNUYUcSmBW7zmqe2sGc7Q6FJscTDS/aReSLm4ae1dQS+T1sCKx6Vpag+5j2Tu IZb1myR/iYGVDub1rRn/twz03G9CcQQdL1ozFWp3pa+KmtCPXa5HST5mNlfKnZKDqdco v3LemvFeEZweMF/Rd49EtivtKThBZode5Kp/u+U75yhs7aY3VxzAshYP0mrBKIIsVEYg uTBtWNmp05MdxP1c14KsuPbv5G8vqzlA6GS/oD9iYRlxHa5tbX4dhykLfQy1r92JAmkb Dl/XoGcQtI9bGJtQ9yCJAC+qspMgfEn2VTU0EwoTz7Q4r5h3HKpDwp4Z6P/LscxSrrKj 0qCA== X-Gm-Message-State: AC+VfDzkIPiD85exr1sVYB30H3Fa6ipxf2txJBBcHWIihmMpTFWuDtZ+ aZ2Odq+5tzSJk7gOmOe8wMvGNQ== X-Google-Smtp-Source: ACHHUZ6fFOMFh+FwU12YfRQVUNKzL4Zw50Ovq3PP5212pZBhNw4LQmUj8O7Bv6Fc9zyeJpMSdFalcg== X-Received: by 2002:a17:903:11d2:b0:1ae:7631:7fa9 with SMTP id q18-20020a17090311d200b001ae76317fa9mr11703605plh.37.1686689215857; Tue, 13 Jun 2023 13:46:55 -0700 (PDT) Received: from www.outflux.net (198-0-35-241-static.hfc.comcastbusiness.net. [198.0.35.241]) by smtp.gmail.com with ESMTPSA id j11-20020a170902690b00b001b03842ab78sm10672486plk.89.2023.06.13.13.46.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jun 2023 13:46:55 -0700 (PDT) Date: Tue, 13 Jun 2023 13:46:54 -0700 From: Kees Cook To: kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Masahiro Yamada , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , "Gustavo A. R. Silva" , linux-kbuild@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: Re: [linux-next:master] [kbuild] df8fc4e934: BUG:unable_to_handle_page_fault_for_address Message-ID: <202306131342.51A51F651C@keescook> References: <202306102333.8f5a7443-oliver.sang@intel.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202306102333.8f5a7443-oliver.sang@intel.com> On Sun, Jun 11, 2023 at 09:41:30PM +0800, kernel test robot wrote: > the issue we found below is by clang-15, but we confirmed clang-15 we use is > commit 8dfdcc7b7b in llvm-project. it supports the flag already. Interesting! Thanks for the report. > [ 228.605608][ C1] BUG: unable to handle page fault for address: 04090300 > [...] > [ 228.608262][ C1] EIP: string (lib/vsprintf.c:644 lib/vsprintf.c:726) > [...] > [ 228.608262][ C1] Call Trace: > [ 228.608262][ C1] > [ 228.608262][ C1] vsnprintf (lib/vsprintf.c:2817) > [ 228.608262][ C1] vprintk_store (kernel/printk/printk.c:2191) > [ 228.608262][ C1] vprintk_emit (kernel/printk/printk.c:2288) > [ 228.608262][ C1] vprintk_default (kernel/printk/printk.c:2318) > [ 228.608262][ C1] vprintk (kernel/printk/printk_safe.c:50) > [ 228.608262][ C1] _printk (kernel/printk/printk.c:2331) > [ 228.608262][ C1] __ubsan_handle_out_of_bounds (lib/ubsan.c:209 lib/ubsan.c:343) This is a crash within the UBSAN handler! That's very unexpected. > [ 228.608262][ C1] get_string (drivers/usb/gadget/composite.c:1314) > [ 228.608262][ C1] composite_setup (drivers/usb/gadget/composite.c:1871) > [ 228.608262][ C1] dummy_timer (drivers/usb/gadget/udc/dummy_hcd.c:?) And the out-of-bounds condition got triggered in dummy_hcd. I also see this is happening in SOFTIRQ context. I wonder if there is a problem with UBSAN vs SOFTIRQ. Again, I'd find that surprising... I'll see what I can find... -- Kees Cook