From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05662C433EF for ; Tue, 26 Apr 2022 16:47:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353277AbiDZQvD (ORCPT ); Tue, 26 Apr 2022 12:51:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353267AbiDZQtd (ORCPT ); Tue, 26 Apr 2022 12:49:33 -0400 Received: from mail-ej1-x649.google.com (mail-ej1-x649.google.com [IPv6:2a00:1450:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6707634D for ; Tue, 26 Apr 2022 09:45:29 -0700 (PDT) Received: by mail-ej1-x649.google.com with SMTP id hs26-20020a1709073e9a00b006f3b957ebb4so838084ejc.7 for ; Tue, 26 Apr 2022 09:45:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=kXck7gc8vUdG+uIpTKbHiyCLJU3V9DKcF3fYel7nQCw=; b=HKjl4po9qikfY5w7sANNOWF8wIYoTZhGhPfGpG2oRS5qaieTXeddZbMui9oEk30REF GfljSR8S1QIxGgAiHnxwjgEv6+EF2+8jJ7T7QZK2oSf8eJtoGjdxW0lf0sHwGI/lNoOh KSwqI4UvdZtVfWHWxZE/JKd/uRDNjbPmLMNeGT3iF7SCfBSOExZCHwBizTIx/FZ301Kf goPWSOE0bCzYKGYIAeB4b4w+/WYrsLZPjYvsQGeev90WIWm90jQbop08KYN+ktuukkjW eqLwPo+Y1By7UOL4GBv0clQvJfdJAgsm6ae+0ok9ios/vlSXb1rGqpnveoFRq063DiYQ GxtA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=kXck7gc8vUdG+uIpTKbHiyCLJU3V9DKcF3fYel7nQCw=; b=lntSxiWjMcXbhU61Eque6WdClkrmdUHtq2IBgGUEeEMn3UHo0C4Dxt7X826nQUHBuu SIJQMreFgeOMyitm6jZGaT5Cp6uwjwLDgPFzEVjj57IKtObmSxbVoo3NPbxaicWp6DPx y3Eer+mIZGRkys6/dnNelTkEqgp17kVKVKBA7sBEmBzpDcIAShVBR9L16TIgzEG8Cwud vAUGL5y54klTAAd7JkrWzxwIS9HQfMv4SYAyX3p5CRy//PbQI3lQnAYi+dMBroNbPL9P q23USt/IEJ3Rv77Ug84j9Xwc4v1RB1Ww91XkyNHZObwHWRPn90Fu19NARw2+qVOanQl9 p7iQ== X-Gm-Message-State: AOAM53264BIuCQ5VpO8LjPtUSKlPJoA9rVTdU2TMvWijHNiF9wulVWTp qyPe4asDgWmFq79rFbu+r7bY9UKak+8= X-Google-Smtp-Source: ABdhPJz2TfzAbBIJqBzng2cj5zaotZzRLvL6/wlz3cGmkr5GPkO9jG7+a46FVlyYEs+vMIVeqbruPJFqxPk= X-Received: from glider.muc.corp.google.com ([2a00:79e0:15:13:d580:abeb:bf6d:5726]) (user=glider job=sendgmr) by 2002:a17:907:1b15:b0:6d7:13bd:dd62 with SMTP id mp21-20020a1709071b1500b006d713bddd62mr21844408ejc.673.1650991528244; Tue, 26 Apr 2022 09:45:28 -0700 (PDT) Date: Tue, 26 Apr 2022 18:42:55 +0200 In-Reply-To: <20220426164315.625149-1-glider@google.com> Message-Id: <20220426164315.625149-27-glider@google.com> Mime-Version: 1.0 References: <20220426164315.625149-1-glider@google.com> X-Mailer: git-send-email 2.36.0.rc2.479.g8af0fa9b8e-goog Subject: [PATCH v3 26/46] kmsan: handle memory sent to/from USB From: Alexander Potapenko To: glider@google.com Cc: Alexander Viro , Andrew Morton , Andrey Konovalov , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Christoph Hellwig , Christoph Lameter , David Rientjes , Dmitry Vyukov , Eric Dumazet , Greg Kroah-Hartman , Herbert Xu , Ilya Leoshkevich , Ingo Molnar , Jens Axboe , Joonsoo Kim , Kees Cook , Marco Elver , Mark Rutland , Matthew Wilcox , "Michael S. Tsirkin" , Pekka Enberg , Peter Zijlstra , Petr Mladek , Steven Rostedt , Thomas Gleixner , Vasily Gorbik , Vegard Nossum , Vlastimil Babka , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org Depending on the value of is_out kmsan_handle_urb() KMSAN either marks the data copied to the kernel from a USB device as initialized, or checks the data sent to the device for being initialized. Signed-off-by: Alexander Potapenko --- v2: -- move kmsan_handle_urb() implementation to this patch Link: https://linux-review.googlesource.com/id/Ifa67fb72015d4de14c30e971556f99fc8b2ee506 --- drivers/usb/core/urb.c | 2 ++ include/linux/kmsan.h | 15 +++++++++++++++ mm/kmsan/hooks.c | 17 +++++++++++++++++ 3 files changed, 34 insertions(+) diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index 33d62d7e3929f..1fe3f23205624 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -426,6 +427,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL | URB_DMA_SG_COMBINED); urb->transfer_flags |= (is_out ? URB_DIR_OUT : URB_DIR_IN); + kmsan_handle_urb(urb, is_out); if (xfertype != USB_ENDPOINT_XFER_CONTROL && dev->state < USB_STATE_CONFIGURED) diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h index d8667161a10c8..55f976b721566 100644 --- a/include/linux/kmsan.h +++ b/include/linux/kmsan.h @@ -20,6 +20,7 @@ struct page; struct kmem_cache; struct task_struct; struct scatterlist; +struct urb; #ifdef CONFIG_KMSAN @@ -236,6 +237,16 @@ void kmsan_handle_dma(struct page *page, size_t offset, size_t size, void kmsan_handle_dma_sg(struct scatterlist *sg, int nents, enum dma_data_direction dir); +/** + * kmsan_handle_urb() - Handle a USB data transfer. + * @urb: struct urb pointer. + * @is_out: data transfer direction (true means output to hardware). + * + * If @is_out is true, KMSAN checks the transfer buffer of @urb. Otherwise, + * KMSAN initializes the transfer buffer. + */ +void kmsan_handle_urb(const struct urb *urb, bool is_out); + #else static inline void kmsan_init_shadow(void) @@ -328,6 +339,10 @@ static inline void kmsan_handle_dma_sg(struct scatterlist *sg, int nents, { } +static inline void kmsan_handle_urb(const struct urb *urb, bool is_out) +{ +} + #endif #endif /* _LINUX_KMSAN_H */ diff --git a/mm/kmsan/hooks.c b/mm/kmsan/hooks.c index 8a6947a2a2f22..9aecbf2825837 100644 --- a/mm/kmsan/hooks.c +++ b/mm/kmsan/hooks.c @@ -17,6 +17,7 @@ #include #include #include +#include #include "../internal.h" #include "../slab.h" @@ -252,6 +253,22 @@ void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy, } EXPORT_SYMBOL(kmsan_copy_to_user); +/* Helper function to check an URB. */ +void kmsan_handle_urb(const struct urb *urb, bool is_out) +{ + if (!urb) + return; + if (is_out) + kmsan_internal_check_memory(urb->transfer_buffer, + urb->transfer_buffer_length, + /*user_addr*/ 0, REASON_SUBMIT_URB); + else + kmsan_internal_unpoison_memory(urb->transfer_buffer, + urb->transfer_buffer_length, + /*checked*/ false); +} +EXPORT_SYMBOL(kmsan_handle_urb); + static void kmsan_handle_dma_page(const void *addr, size_t size, enum dma_data_direction dir) { -- 2.36.0.rc2.479.g8af0fa9b8e-goog