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 961E7C43334 for ; Fri, 1 Jul 2022 14:26:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232077AbiGAO0Z (ORCPT ); Fri, 1 Jul 2022 10:26:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231990AbiGAOZf (ORCPT ); Fri, 1 Jul 2022 10:25:35 -0400 Received: from mail-ed1-x549.google.com (mail-ed1-x549.google.com [IPv6:2a00:1450:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D37D433BC for ; Fri, 1 Jul 2022 07:24:12 -0700 (PDT) Received: by mail-ed1-x549.google.com with SMTP id f13-20020a0564021e8d00b00437a2acb543so1883132edf.7 for ; Fri, 01 Jul 2022 07:24:11 -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=d5jq2vBXLL0PAqQqIdp+R/eYgdfcHLruJviOlOzbAyw=; b=foA7zxm3d/yxHBn+7dN7Qf5yVA+m4cALhyxiFKss7bKF1M3ODx5vEwdDu8Z7CnbCBu OSIkaWKjVsPLHctCSmjj3EWUvd9aiSVqRJZDm9K2CWqUG+ieeba45Mq3u6VJQJwcNq0r lOhN5cunTXvYPcXTrITquDdeJ+XqRcLXJE5ps4uaJ8K1ae2F4Veo0wjtVjDSDkzSsl+w BbkhLScv8E9JYEftt93Q5opL13Lup7qtptxPZoQ4Dr14N6VU9IQAlCZiwEZVKyBiSk5N b6V/btlcruxgs+blFm7eLtLE3qAI3wOZyf4T1eZP8bk02wLrZgXR4/OGq1K4+0HF+aE0 hslw== 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=d5jq2vBXLL0PAqQqIdp+R/eYgdfcHLruJviOlOzbAyw=; b=z+SmlwwbNGjPiLlr+WWfl4lfPxHZGXVVBKRRLQ223uA8203AKSATKIz84qpcS5dcrD NBdHsJRO8LGpCLBHv8NcExBQYySt0WwUB6+ze1IQofV3QlrXMQYbX6a/06jZt6yln7H8 k8I0J498O8rIndzaGd94DiI4EJBFbCLJx4K0W38qEOyQTRCQZefRp3wyn8vyWXFCLu5F Ntui8aJa4oBkLL95npYibx2V7rh9FD8J4xRTgJ3Z32fLDMcKtAF5QxLhpaOP2++lcVZr yE9clvlpqsEmy2oukQR14h/Ie4zh7cguxZcqkZOaVowe9pE7DwNb5It5yM+7A+hFq+fX HeQA== X-Gm-Message-State: AJIora+dGlzNHNuy/PYtEx9D5gG/ThHXlTLcl1cIiQcscb/YopxSpZ0b 82+pek2fDwKj/c5R/ZjjIqcBRPVVLCc= X-Google-Smtp-Source: AGRyM1tOQ9hEzrWjXXF1mGZvlD2bn9kK96D3aHnwRR/ak9ADNhFKggqQeO/Ez5UYkEsxu56uu1Qj7OsLgis= X-Received: from glider.muc.corp.google.com ([2a00:79e0:9c:201:a6f5:f713:759c:abb6]) (user=glider job=sendgmr) by 2002:aa7:d5c9:0:b0:435:8099:30e6 with SMTP id d9-20020aa7d5c9000000b00435809930e6mr19303788eds.384.1656685451552; Fri, 01 Jul 2022 07:24:11 -0700 (PDT) Date: Fri, 1 Jul 2022 16:22:45 +0200 In-Reply-To: <20220701142310.2188015-1-glider@google.com> Message-Id: <20220701142310.2188015-21-glider@google.com> Mime-Version: 1.0 References: <20220701142310.2188015-1-glider@google.com> X-Mailer: git-send-email 2.37.0.rc0.161.g10f37bed90-goog Subject: [PATCH v4 20/45] 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-kernel@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); -- 2.37.0.rc0.161.g10f37bed90-goog