From nobody Mon Nov 25 02:56:01 2024 Received: from fanzine2.igalia.com (fanzine.igalia.com [178.60.130.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2402C1EF095; Wed, 30 Oct 2024 14:14:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.60.130.6 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730297696; cv=none; b=oK+bbTlbw2Md7QEAXCqq9YMqYktLMnR9jMP6VRwR0yuvjPmMxJOypF/E7ACr/AAm1H/nYa8+1y3FuLe5XO91sLnUpKT316dxZlHW1L3GinBmi7hcPJReQO7RDSIVLcUnGWYTOduGHN7pN71a7LLDtAakwkHhIyeiTVdPPPYQEf0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730297696; c=relaxed/simple; bh=V7XbNCI+y0Vja1Ya3QUPKHzcNmuePulkbMMVMW94cyU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=fC50j5Wf28oD4fTDYuSoiv/JObRuE0U3oxXGayujC+xwRnzRjNEwpaRX3yQR8w5VdwfGx9Gq0dUiwTgrXeMcoCBAabWidQwz4nWN/cLXiHyV7Ki2c1aO0+0wQWGMn+NiB/4d1agenz01PtDd2NjtrNDn3g/nvNFOVy352idV99o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=Q8bGm43a; arc=none smtp.client-ip=178.60.130.6 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="Q8bGm43a" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject: Cc:To:From:Sender:Reply-To:Content-Type:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=B4k0iWwm0nLFX+L3oF505AnrUFVobXPrf0f5J1041gc=; b=Q8bGm43a9qpRmka9D8b77c13bD QRuvU5Fo8fa8aa2DVTOqX+bodsN9ZOraMdNdPTF2+IVi7799Pb1k+PbjgD+9yFCx+xmS9+9LWZ8sD LfZg3JlWnUZU/6TM1cezO1HTVbIF/+gH2FL6LtDkS9PbVw3V0UqQ7Z91AL3uF6lAVUFC/9aUifLhu Molspq09PMRqgQWYsowG4recw9+rPikrdeqrvsqG2k/hwb0Bebr8j+GUQ3TFK0cFTw2CpzHSXPcbj GJBPHwwF8RbrqXY7uIInMI+2VxtSLaujTt2+FAjWmXyG8qC+hyhYDxbMXUsaUS3z0wNortI4pbPf/ +PnDCEeA==; Received: from [189.79.117.125] (helo=localhost) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1t69TC-00H78u-5x; Wed, 30 Oct 2024 15:14:47 +0100 From: "Guilherme G. Piccoli" To: pkshih@realtek.com, linux-wireless@vger.kernel.org Cc: kvalo@kernel.org, linux-kernel@vger.kernel.org, kernel@gpiccoli.net, kernel-dev@igalia.com, rtl8821cerfe2@gmail.com, "Guilherme G. Piccoli" , stable@vger.kernel.org, syzbot+edd9fe0d3a65b14588d5@syzkaller.appspotmail.com Subject: [PATCH V2] wifi: rtlwifi: Drastically reduce the attempts to read efuse in case of failures Date: Wed, 30 Oct 2024 11:09:52 -0300 Message-ID: <20241030141440.1153887-1-gpiccoli@igalia.com> X-Mailer: git-send-email 2.46.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Syzkaller reported a hung task with uevent_show() on stack trace. That specific issue was addressed by another commit [0], but even with that fix applied (for example, running v6.12-rc5) we face another type of hung task that comes from the same reproducer [1]. By investigating that, we could narrow it to the following path: (a) Syzkaller emulates a Realtek USB WiFi adapter using raw-gadget and dummy_hcd infrastructure. (b) During the probe of rtl8192cu, the driver ends-up performing an efuse read procedure (which is related to EEPROM load IIUC), and here lies the issue: the function read_efuse() calls read_efuse_byte() many times, as loop iterations depending on the efuse size (in our example, 512 in total). This procedure for reading efuse bytes relies in a loop that performs an I/O read up to *10k* times in case of failures. We measured the time of the loop inside read_efuse_byte() alone, and in this reproducer (which involves the dummy_hcd emulation layer), it takes 15 seconds each. As a consequence, we have the driver stuck in its probe routine for big time, exposing a stack trace like below if we attempt to reboot the system, for example: task:kworker/0:3 state:D stack:0 pid:662 tgid:662 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: __schedule+0xe22/0xeb6 schedule_timeout+0xe7/0x132 __wait_for_common+0xb5/0x12e usb_start_wait_urb+0xc5/0x1ef ? usb_alloc_urb+0x95/0xa4 usb_control_msg+0xff/0x184 _usbctrl_vendorreq_sync+0xa0/0x161 _usb_read_sync+0xb3/0xc5 read_efuse_byte+0x13c/0x146 read_efuse+0x351/0x5f0 efuse_read_all_map+0x42/0x52 rtl_efuse_shadow_map_update+0x60/0xef rtl_get_hwinfo+0x5d/0x1c2 rtl92cu_read_eeprom_info+0x10a/0x8d5 ? rtl92c_read_chip_version+0x14f/0x17e rtl_usb_probe+0x323/0x851 usb_probe_interface+0x278/0x34b really_probe+0x202/0x4a4 __driver_probe_device+0x166/0x1b2 driver_probe_device+0x2f/0xd8 [...] We propose hereby to drastically reduce the attempts of doing the I/O reads in case of failures, restricted to USB devices (given that they're inherent= ly slower than PCIe ones). By retrying up to 10 times (instead of 10000), we got responsiveness in the reproducer, while seems reasonable to believe that there's no sane USB device implementation in the field requiring this amount of retries (at every I/O read) in order to properly work. Based on that assumption, it'd be good to have it backported to stable but maybe not since driver implementation (the 10k number comes from day 0), perhaps up to 6.x series makes sense. [0] Commit 15fffc6a5624 ("driver core: Fix uevent_show() vs driver detach r= ace"). [1] A note about that: this syzkaller report presents multiple reproducers that differs by the type of emulated USB device. For this specific case, check the entry from 2024/08/08 06:23 in the list of crashes; the C repro is available at https://syzkaller.appspot.com/text?tag=3DReproC&x=3D1521fc8= 3980000. Cc: stable@vger.kernel.org # v6.1+ Reported-by: syzbot+edd9fe0d3a65b14588d5@syzkaller.appspotmail.com Tested-by: Bitterblue Smith Signed-off-by: Guilherme G. Piccoli --- V2: - Restrict the change to USB device only (thanks Ping-Ke Shih). - Tested in 2 USB devices by Bitterblue Smith - thanks a lot! V1: https://lore.kernel.org/lkml/20241025150226.896613-1-gpiccoli@igalia.co= m/ drivers/net/wireless/realtek/rtlwifi/efuse.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/realtek/rtlwifi/efuse.c b/drivers/net/wir= eless/realtek/rtlwifi/efuse.c index 82cf5fb5175f..f741066c06de 100644 --- a/drivers/net/wireless/realtek/rtlwifi/efuse.c +++ b/drivers/net/wireless/realtek/rtlwifi/efuse.c @@ -164,7 +164,17 @@ void read_efuse_byte(struct ieee80211_hw *hw, u16 _off= set, u8 *pbuf) struct rtl_priv *rtlpriv =3D rtl_priv(hw); u32 value32; u8 readbyte; - u16 retry; + u16 retry, max_attempts; + + /* + * In case of USB devices, transfer speeds are limited, hence + * efuse I/O reads could be (way) slower. So, decrease (a lot) + * the read attempts in case of failures. + */ + if (rtlpriv->rtlhal.interface =3D=3D INTF_PCI) + max_attempts =3D 10000; + else + max_attempts =3D 10; =20 rtl_write_byte(rtlpriv, rtlpriv->cfg->maps[EFUSE_CTRL] + 1, (_offset & 0xff)); @@ -178,7 +188,7 @@ void read_efuse_byte(struct ieee80211_hw *hw, u16 _offs= et, u8 *pbuf) =20 retry =3D 0; value32 =3D rtl_read_dword(rtlpriv, rtlpriv->cfg->maps[EFUSE_CTRL]); - while (!(((value32 >> 24) & 0xff) & 0x80) && (retry < 10000)) { + while (!(((value32 >> 24) & 0xff) & 0x80) && (retry < max_attempts)) { value32 =3D rtl_read_dword(rtlpriv, rtlpriv->cfg->maps[EFUSE_CTRL]); retry++; --=20 2.46.2