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 750E6ECAAD4 for ; Fri, 26 Aug 2022 15:13:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344094AbiHZPM7 (ORCPT ); Fri, 26 Aug 2022 11:12:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245744AbiHZPMB (ORCPT ); Fri, 26 Aug 2022 11:12:01 -0400 Received: from mail-ed1-x54a.google.com (mail-ed1-x54a.google.com [IPv6:2a00:1450:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 135F4DDB72 for ; Fri, 26 Aug 2022 08:09:17 -0700 (PDT) Received: by mail-ed1-x54a.google.com with SMTP id y14-20020a056402440e00b0044301c7ccd9so1220393eda.19 for ; Fri, 26 Aug 2022 08:09:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc; bh=sAAv4rjcKBcVdRkEmlFE/2pa6fVQ+FymuVP5r3ZkSlI=; b=JZiG5Re4MF+VCa2xcEOtoGIN0T2/OlhDseNXFK0iQ1PnqQdTbI1JZrkp7lVyg8+XXy 3FX58aOp3yEhQ69BL9KLP1xsx5YJIe9+zppmM6QMfAhSuxAKThSHgjQM2yycPHihDuKz i2djpfTU43h2g5u3Lr7aPVAqaJIecBrr7/zGlgzSAGfdlt6KxN6oVSMfJ2omoi6N/bK4 GRhnLyqkHBfxBRxMrlZ83fqspSPBqI2I6ldHAHjwHJMOXx3wWPO3DfQ80yGF5CLrbpfN 7wncFTD4b9cCQe70WIerWDhBUOJbuexSLBDBhL5Axyzz/siEoiRyAYSkCi88l1QWaf/L BH0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc; bh=sAAv4rjcKBcVdRkEmlFE/2pa6fVQ+FymuVP5r3ZkSlI=; b=djNIvRnm4UL+U1aAJE0xbusEiAqsN8jjDo3QAwG2SOMwG9jMLxwqCcEPAYdSnrZ/Wi pMLd/plgWgYKALXFJ3O/LZBg8UpBBj2lC/T0CraJ1zZb7YOgaAELEbuhmxB87ZDtKs9c BY0Tee/uoGCQ5mohPpghGZ/xUAnXbQ7aqaqo7EDAkDc+OAwQC9ELyEUSovWNGLzLyoUN 7Oor/HcBU6ARRFhpsoX9bXgA+B68+7T9A4WT8su+xL9iGeg7V3ooswus7J4MgrsOegK/ fcSrEPUPa0bzExQRSrmJ0YGFjX6ikXjGl3DYWyyP6HjEhRXWwOyqDdcqkmo0B2XrI26D nSzw== X-Gm-Message-State: ACgBeo3ITFtfZNf/LhiBKV+05aeYyEDz9ibbcRL6N2OVp2Qo0xWrtM+P Gole+AkJOUYWMDKrRCL+op08GcvclOY= X-Google-Smtp-Source: AA6agR7I8UjZBgTpe1NFCsD09x2YoQcBDBFrSyqklOpQRZZDZsEGkSDDS6+A5L7hb/nYEuWrc359HGbAT9Q= X-Received: from glider.muc.corp.google.com ([2a00:79e0:9c:201:5207:ac36:fdd3:502d]) (user=glider job=sendgmr) by 2002:a05:6402:894:b0:447:fe25:15cf with SMTP id e20-20020a056402089400b00447fe2515cfmr1613274edy.404.1661526548777; Fri, 26 Aug 2022 08:09:08 -0700 (PDT) Date: Fri, 26 Aug 2022 17:07:43 +0200 In-Reply-To: <20220826150807.723137-1-glider@google.com> Mime-Version: 1.0 References: <20220826150807.723137-1-glider@google.com> X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220826150807.723137-21-glider@google.com> Subject: [PATCH v5 20/44] kmsan: add iomap support From: Alexander Potapenko To: glider@google.com Cc: Alexander Viro , Alexei Starovoitov , 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 Functions from lib/iomap.c interact with hardware, so KMSAN must ensure that: - every read function returns an initialized value - every write function checks values before sending them to hardware. Signed-off-by: Alexander Potapenko --- v4: -- switch from __no_sanitize_memory (which now means "no KMSAN instrumentation") to __no_kmsan_checks (i.e. "unpoison everything") Link: https://linux-review.googlesource.com/id/I45527599f09090aca046dfe1a26df453adab100d --- lib/iomap.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/lib/iomap.c b/lib/iomap.c index fbaa3e8f19d6c..4f8b31baa5752 100644 --- a/lib/iomap.c +++ b/lib/iomap.c @@ -6,6 +6,7 @@ */ #include #include +#include #include @@ -70,26 +71,35 @@ static void bad_io_access(unsigned long port, const char *access) #define mmio_read64be(addr) swab64(readq(addr)) #endif +/* + * Here and below, we apply __no_kmsan_checks to functions reading data from + * hardware, to ensure that KMSAN marks their return values as initialized. + */ +__no_kmsan_checks unsigned int ioread8(const void __iomem *addr) { IO_COND(addr, return inb(port), return readb(addr)); return 0xff; } +__no_kmsan_checks unsigned int ioread16(const void __iomem *addr) { IO_COND(addr, return inw(port), return readw(addr)); return 0xffff; } +__no_kmsan_checks unsigned int ioread16be(const void __iomem *addr) { IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr)); return 0xffff; } +__no_kmsan_checks unsigned int ioread32(const void __iomem *addr) { IO_COND(addr, return inl(port), return readl(addr)); return 0xffffffff; } +__no_kmsan_checks unsigned int ioread32be(const void __iomem *addr) { IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr)); @@ -142,18 +152,21 @@ static u64 pio_read64be_hi_lo(unsigned long port) return lo | (hi << 32); } +__no_kmsan_checks u64 ioread64_lo_hi(const void __iomem *addr) { IO_COND(addr, return pio_read64_lo_hi(port), return readq(addr)); return 0xffffffffffffffffULL; } +__no_kmsan_checks u64 ioread64_hi_lo(const void __iomem *addr) { IO_COND(addr, return pio_read64_hi_lo(port), return readq(addr)); return 0xffffffffffffffffULL; } +__no_kmsan_checks u64 ioread64be_lo_hi(const void __iomem *addr) { IO_COND(addr, return pio_read64be_lo_hi(port), @@ -161,6 +174,7 @@ u64 ioread64be_lo_hi(const void __iomem *addr) return 0xffffffffffffffffULL; } +__no_kmsan_checks u64 ioread64be_hi_lo(const void __iomem *addr) { IO_COND(addr, return pio_read64be_hi_lo(port), @@ -188,22 +202,32 @@ EXPORT_SYMBOL(ioread64be_hi_lo); void iowrite8(u8 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, outb(val,port), writeb(val, addr)); } void iowrite16(u16 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, outw(val,port), writew(val, addr)); } void iowrite16be(u16 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr)); } void iowrite32(u32 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, outl(val,port), writel(val, addr)); } void iowrite32be(u32 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr)); } EXPORT_SYMBOL(iowrite8); @@ -239,24 +263,32 @@ static void pio_write64be_hi_lo(u64 val, unsigned long port) void iowrite64_lo_hi(u64 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, pio_write64_lo_hi(val, port), writeq(val, addr)); } void iowrite64_hi_lo(u64 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, pio_write64_hi_lo(val, port), writeq(val, addr)); } void iowrite64be_lo_hi(u64 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, pio_write64be_lo_hi(val, port), mmio_write64be(val, addr)); } void iowrite64be_hi_lo(u64 val, void __iomem *addr) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(&val, sizeof(val)); IO_COND(addr, pio_write64be_hi_lo(val, port), mmio_write64be(val, addr)); } @@ -328,14 +360,20 @@ static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count) void ioread8_rep(const void __iomem *addr, void *dst, unsigned long count) { IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count)); + /* KMSAN must treat values read from devices as initialized. */ + kmsan_unpoison_memory(dst, count); } void ioread16_rep(const void __iomem *addr, void *dst, unsigned long count) { IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count)); + /* KMSAN must treat values read from devices as initialized. */ + kmsan_unpoison_memory(dst, count * 2); } void ioread32_rep(const void __iomem *addr, void *dst, unsigned long count) { IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count)); + /* KMSAN must treat values read from devices as initialized. */ + kmsan_unpoison_memory(dst, count * 4); } EXPORT_SYMBOL(ioread8_rep); EXPORT_SYMBOL(ioread16_rep); @@ -343,14 +381,20 @@ EXPORT_SYMBOL(ioread32_rep); void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(src, count); IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count)); } void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(src, count * 2); IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count)); } void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count) { + /* Make sure uninitialized memory isn't copied to devices. */ + kmsan_check_memory(src, count * 4); IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count)); } EXPORT_SYMBOL(iowrite8_rep); -- 2.37.2.672.g94769d06f0-goog