From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 4621432E151; Sat, 17 Oct 2026 17:03:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792256632; cv=none; b=lhT2wshHjgeCrFThxO9z0VaTq24q/fUdKDz7DGOPEq7pSn/Bipc020pq760AizNbqQJe02n15e7dIPM0Tv2t1ssNY0Af1bE7cuDruHsMzg4ondFtyN+n+t+4czKAVGTQKJ39o9cxX01yY4rbwXoAWjP/LA5N1yT+dt9P1sPZ36E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792256632; c=relaxed/simple; bh=z/3bdoK3CkAcmErWsQsHE9k3ZclReAoSiZmFpmM1AcQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Tu+rg4Uf7c4FVDIdqmJpJ6dfCpa7RIC0rBFYZBsINrcg907QH2DSXuvLasXE/SnmMXTI0Fr2wM1XYo45F6EElT1BzRR05bJ4JUh+KASAyd67kTsXkeZ4uLnY85pnGD3Hgg6XSsdoYQJ45kaNC/3qlhFROvozNHTRC3VPFXeXy7c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=o9orTd49; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="o9orTd49" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DC7A1F000C4; Sat, 17 Oct 2026 17:03:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792256631; bh=hLK8W9nyBTcSCnHxdD/BuOWHflv6RTYf4VbIl/MhGCI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=o9orTd49UVOBuI8RRY2dRDvvpU83tPB4VzFDPQpeBqC0Nj2Q0FrvU1iEHuPCb0ANA Ctp3r3S2MBjcSpKmD5HimeWkJyq+E2oED0guRhM/r/oQrjaXz44GqFK3m3Vnzsb93m sPTVO2saUwqAY+PW0hmOP6jm0bFjoH48tdCXJMeI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Syed Labeeq Sajid Bukhari Subject: [PATCH 6.6 0258/1674] usb: storage: sierra_ms: reject short SWoC info transfers Date: Sat, 17 Oct 2026 17:42:10 +0200 Message-ID: <20261017160437.747400127@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261017160431.119607952@linuxfoundation.org> References: <20261017160431.119607952@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Syed Labeeq Sajid Bukhari commit 8a0200d14acd9db388b85cd016e68a4e60d900ec upstream. sierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes from the device via usb_control_msg(), but its callers only treat a negative return value as failure. A device that answers the vendor-specific GetSwocInfo request with a short IN transfer is therefore accepted, leaving the tail of the freshly allocated (kmalloc(), non-zeroing) swoc_info buffer uninitialized. truinst_show() subsequently prints swocInfo->rev, swocInfo->LinuxSKU and swocInfo->LinuxVer from that buffer into the world-readable (0444) "truinst" sysfs attribute. An emulated/malicious USB device (VID 0x1199, PID 0x0fff) can exploit this to disclose up to 5 bytes of stale kernel heap memory (kmalloc-64) to unprivileged userspace, once per sysfs read, indefinitely. On kernels built without init_on_alloc this leaks recently freed heap contents. Only accept the transfer when the full structure was received. sierra_ms_init() already retries failed queries, so well-behaved devices are unaffected. Fixes: 32fe5e393455 ("USB Storage Sierra: TRU-Install feature update") Cc: stable Signed-off-by: Syed Labeeq Sajid Bukhari Assisted-by: Kimi:K2 [Kimi Code CLI] Link: https://patch.msgid.link/20260910140343.49371-1-syedlabeeq@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/sierra_ms.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/drivers/usb/storage/sierra_ms.c +++ b/drivers/usb/storage/sierra_ms.c @@ -77,6 +77,13 @@ static int sierra_get_swoc_info(struct u sizeof(struct swoc_info), /* __u16 size */ USB_CTRL_SET_TIMEOUT); /* int timeout */ + /* + * A short IN transfer leaves the tail of swocInfo uninitialized; + * only a full transfer is valid. + */ + if (result != sizeof(struct swoc_info)) + return -EIO; + swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU); swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer); return result;