From patchwork Mon Dec 13 21:55:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: andrey.konovalov@linux.dev X-Patchwork-Id: 12695996 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9E709C433EF for ; Mon, 13 Dec 2021 22:25:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hiHkVuQ+ASGQLuS6nTWXw+8YUz5ML838VuMVv20EBEg=; b=1Fnr//zNAGXsxa m+Y0FREL4nGncWzhjKFPNwOeCvtUDMU9AJJIKMb7vYSpxhyVZeKgfMM5oFdxEC2jR9BPRERQgH3nX 6U6l0F7zU3+4r7770FD/cBGUtTdC72pjux8A7NpE+bIdUHiKte9ZGjZFC+Rc6mVa0b6JtXNa05lI3 TQ+7v22e8JY0z44fwm0RFUr76W2cGf8ylxKAouwk6fZbZ6Q2h7Vu1p6kF8haBJVrJGm3VMyY0FcVr WcfDT/uJ5VQF2A5Z+MCnbI9I69oxtXJOxnl9KjPOfKhhrhfGDsPyq7kJ3GFStZFN8PsxxaeUgt06z vJ8d4NFgyEQcymZ3DCFQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mwtja-00Bi9A-Eo; Mon, 13 Dec 2021 22:23:50 +0000 Received: from out0.migadu.com ([2001:41d0:2:267::]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mwtIS-00BWx1-En for linux-arm-kernel@lists.infradead.org; Mon, 13 Dec 2021 21:55:50 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1639432547; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XC1+Aytkcqzf1ileaTyJqJ/4yyuLy4mtp9hx3Zvq9co=; b=obiHIW5B/YO92XbWE91Y4CoZ7h6HL1VpqB75Us0IuTuXzXKiqarcIGgNZxGlS6JoVfxNmh lkbEdhNL1ABQTolxHJR/1ZUsd0m3fsGvUu4+NufcIw0pf0wt3o2xJrGnJZsgaQNmmveEJi 4LQ4TYV5/tIgTRMdG8VeOujrcX+Z2LM= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko , Andrew Morton Cc: Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, linux-mm@kvack.org, Vincenzo Frascino , Catalin Marinas , Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, Peter Collingbourne , Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH mm v3 35/38] kasan: allow enabling KASAN_VMALLOC and SW/HW_TAGS Date: Mon, 13 Dec 2021 22:55:37 +0100 Message-Id: <90635a81c52723268a9c9ebc683243dd88e4a4eb.1639432170.git.andreyknvl@google.com> In-Reply-To: References: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: andrey.konovalov@linux.dev X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211213_135548_709555_E6E53FC6 X-CRM114-Status: GOOD ( 10.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Andrey Konovalov Allow enabling CONFIG_KASAN_VMALLOC with SW_TAGS and HW_TAGS KASAN modes. Also adjust CONFIG_KASAN_VMALLOC description: - Mention HW_TAGS support. - Remove unneeded internal details: they have no place in Kconfig description and are already explained in the documentation. Signed-off-by: Andrey Konovalov --- lib/Kconfig.kasan | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index 879757b6dd14..1f3e620188a2 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -178,17 +178,17 @@ config KASAN_TAGS_IDENTIFY memory consumption. config KASAN_VMALLOC - bool "Back mappings in vmalloc space with real shadow memory" - depends on KASAN_GENERIC && HAVE_ARCH_KASAN_VMALLOC + bool "Check accesses to vmalloc allocations" + depends on HAVE_ARCH_KASAN_VMALLOC help - By default, the shadow region for vmalloc space is the read-only - zero page. This means that KASAN cannot detect errors involving - vmalloc space. - - Enabling this option will hook in to vmap/vmalloc and back those - mappings with real shadow memory allocated on demand. This allows - for KASAN to detect more sorts of errors (and to support vmapped - stacks), but at the cost of higher memory usage. + This mode makes KASAN check accesses to vmalloc allocations for + validity. + + With software KASAN modes, checking is done for all types of vmalloc + allocations. Enabling this option leads to higher memory usage. + + With hardware tag-based KASAN, only VM_ALLOC mappings are checked. + There is no additional memory usage. config KASAN_KUNIT_TEST tristate "KUnit-compatible tests of KASAN bug detection capabilities" if !KUNIT_ALL_TESTS