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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E128EC83F26 for ; Tue, 29 Jul 2025 16:14:17 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 822386B008C; Tue, 29 Jul 2025 12:14:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7FA516B0092; Tue, 29 Jul 2025 12:14:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6E8B66B0095; Tue, 29 Jul 2025 12:14:17 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 5CEC56B008C for ; Tue, 29 Jul 2025 12:14:17 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 0AE781D63F7 for ; Tue, 29 Jul 2025 16:14:17 +0000 (UTC) X-FDA: 83717799354.29.5C2F883 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) by imf25.hostedemail.com (Postfix) with ESMTP id 86247A0005 for ; Tue, 29 Jul 2025 16:14:14 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=dV7yyvvm; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=RXsNpneX; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=dV7yyvvm; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=RXsNpneX; spf=pass (imf25.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.131 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1753805654; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=tRO/PahJzO9a91Wm1hhkBQhQCmcAHpY0UEI4yNOBKrQ=; b=PaUh97VK8TnYkilJ8r1OUJl3x5UqE0w1FUXCmDi61lfB17zQdnZuAUbpRqbBIGGz3yWot/ W8T/Jh2DIIExRAh8A6l2Ay3Ee/9jmixXNN4AByTMYmoH2bnG6NFau87jYeRQAu6mU3hMAU RsCX4DqlhCYzIpys7SKmSIRT2Yr2laM= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=dV7yyvvm; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=RXsNpneX; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=dV7yyvvm; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=RXsNpneX; spf=pass (imf25.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.131 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1753805654; a=rsa-sha256; cv=none; b=8FpV9WwqsjGR2Wui98UqcpPa5Edhwbs6c9X6f/7Eq3NpmPRe8oq/ItZUCbsJE01OFOKudD lu/7br6Qefiv7xyD4/PYvyaKZ9FnlMUJwrWZx5pGePMu/J+kkOKJonCvwT1SeC74PImElc xH6NXYDeBWmMG+1ZUONMvZkpz6iix14= Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id C04191F385; Tue, 29 Jul 2025 16:14:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1753805652; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=tRO/PahJzO9a91Wm1hhkBQhQCmcAHpY0UEI4yNOBKrQ=; b=dV7yyvvmaHLt7JH6e2ekQfvH/Cip6RPffVBlpCMyfcNicdy8u2qhpk227wnarZ2Enm0iTk ZaUlSwIo+NZSfZ6f/ntz+R1juWPS6MBPVu2DLnp3ZPwThXyC3Nr8DnESCgtSAZ1UsdM0H0 X5+vQE5AzG19EueQBd8LdzCyVGk8HZE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1753805652; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=tRO/PahJzO9a91Wm1hhkBQhQCmcAHpY0UEI4yNOBKrQ=; b=RXsNpneXSJ/9FfueZ3vsC6Z4qnHZPlKUW6vVh5Om7wzxWAU7rEcQfnFqWj3oUDuMaF2zlI pJ2wYuKOJZyk9xCg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1753805652; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=tRO/PahJzO9a91Wm1hhkBQhQCmcAHpY0UEI4yNOBKrQ=; b=dV7yyvvmaHLt7JH6e2ekQfvH/Cip6RPffVBlpCMyfcNicdy8u2qhpk227wnarZ2Enm0iTk ZaUlSwIo+NZSfZ6f/ntz+R1juWPS6MBPVu2DLnp3ZPwThXyC3Nr8DnESCgtSAZ1UsdM0H0 X5+vQE5AzG19EueQBd8LdzCyVGk8HZE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1753805652; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=tRO/PahJzO9a91Wm1hhkBQhQCmcAHpY0UEI4yNOBKrQ=; b=RXsNpneXSJ/9FfueZ3vsC6Z4qnHZPlKUW6vVh5Om7wzxWAU7rEcQfnFqWj3oUDuMaF2zlI pJ2wYuKOJZyk9xCg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id A63E313A73; Tue, 29 Jul 2025 16:14:12 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 29nsJ1TziGg5WQAAD6G6ig (envelope-from ); Tue, 29 Jul 2025 16:14:12 +0000 Message-ID: <6aeb9c5d-7c3f-4c0c-989f-df309267ffbe@suse.cz> Date: Tue, 29 Jul 2025 18:14:12 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] kasan: add test for SLAB_TYPESAFE_BY_RCU quarantine skipping Content-Language: en-US To: Jann Horn , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Andrew Morton Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20250728-kasan-tsbrcu-noquarantine-test-v1-1-fa24d9ab7f41@google.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20250728-kasan-tsbrcu-noquarantine-test-v1-1-fa24d9ab7f41@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: khhf6tfio3m1pptydyj7smmgurumandr X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 86247A0005 X-Rspam-User: X-HE-Tag: 1753805654-613333 X-HE-Meta: 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 mZu5RUkq 7lc3D7pMg3twQue41ar+0T/q20eqylr0nYD3X5yrOK95GQyij2QU5gzGp5pvDg7TvQ4EqWcJxGi84g+F2tHKVWvJ+/wTu3QOOwHxxZUFKTDL3k8CjOnLIJYjjZ3FtTy5zgcF4NljgPKYhOMI25KkZuypngWGEM16S8wFfy9kL9BnrUS03pEJka/Mj2Uq8Gl7m2MFgRC6QW+yVe/HVtdXAOO6UHepvSl25cTnQ4J6DntGJEAQI580bysh2uElzYv7pFYnDlzQsLa0OD1/+6S0wzFDHzLJ7BZaknTQlYZq6IlIoFAUSC7TOn6WwpqegR1iLYtdo5QJMmtMGTwt2caktDETmuKacjIEhwwnZYbLmh4raUqNGp5T9XuwiNRiQYNaFuk79iwaSTzLfDNgQPgCuxmJbCL3PPo0iiYPS5bXB+dEX3dYXMsxiB7ZqAc8a5Wolh0Bed5YT0xx7UOvyzUliDTUkj9BJwUyvKE4XvW0oUx7e5eA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/28/25 17:25, Jann Horn wrote: > Verify that KASAN does not quarantine objects in SLAB_TYPESAFE_BY_RCU slabs > if CONFIG_SLUB_RCU_DEBUG is off. > > Suggested-by: Andrey Konovalov > Signed-off-by: Jann Horn > --- > Feel free to either take this as a separate commit or squash it into the > preceding "[PATCH] kasan: skip quarantine if object is still accessible > under RCU". > > I tested this by running KASAN kunit tests for x86-64 with KASAN > and tracing manually enabled; there are two failing tests but those > seem unrelated (kasan_memchr is unexpectedly not detecting some > accesses, and kasan_strings is also failing). > --- > mm/kasan/kasan_test_c.c | 36 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 36 insertions(+) > > diff --git a/mm/kasan/kasan_test_c.c b/mm/kasan/kasan_test_c.c > index 5f922dd38ffa..15d3d82041bf 100644 > --- a/mm/kasan/kasan_test_c.c > +++ b/mm/kasan/kasan_test_c.c > @@ -1073,6 +1073,41 @@ static void kmem_cache_rcu_uaf(struct kunit *test) > kmem_cache_destroy(cache); > } > > +/* > + * Check that SLAB_TYPESAFE_BY_RCU objects are immediately reused when > + * CONFIG_SLUB_RCU_DEBUG is off, and stay at the same address. > + */ > +static void kmem_cache_rcu_reuse(struct kunit *test) > +{ > + char *p, *p2; > + struct kmem_cache *cache; > + > + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_SLUB_RCU_DEBUG); > + > + cache = kmem_cache_create("test_cache", 16, 0, SLAB_TYPESAFE_BY_RCU, > + NULL); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); Hmm is there anything inherent in kunit that keeps the test pinned to the same cpu? Otherwise I think you'll need here migrate_disable(); > + p = kmem_cache_alloc(cache, GFP_KERNEL); > + if (!p) { > + kunit_err(test, "Allocation failed: %s\n", __func__); > + kmem_cache_destroy(cache); > + return; > + } > + > + kmem_cache_free(cache, p); > + p2 = kmem_cache_alloc(cache, GFP_KERNEL); and here (or later) migrate_enable(); > + if (!p2) { > + kunit_err(test, "Allocation failed: %s\n", __func__); > + kmem_cache_destroy(cache); > + return; > + } > + KUNIT_ASSERT_PTR_EQ(test, p, p2); Otherwise the cpu slab caching of SLUB and a migration could mean this won't hold as you'll get object from another slab. > + kmem_cache_free(cache, p2); > + kmem_cache_destroy(cache); > +} > + > static void kmem_cache_double_destroy(struct kunit *test) > { > struct kmem_cache *cache; > @@ -2098,6 +2133,7 @@ static struct kunit_case kasan_kunit_test_cases[] = { > KUNIT_CASE(kmem_cache_double_free), > KUNIT_CASE(kmem_cache_invalid_free), > KUNIT_CASE(kmem_cache_rcu_uaf), > + KUNIT_CASE(kmem_cache_rcu_reuse), > KUNIT_CASE(kmem_cache_double_destroy), > KUNIT_CASE(kmem_cache_accounted), > KUNIT_CASE(kmem_cache_bulk), > > --- > base-commit: 0df7d6c9705b283d5b71ee0ae86ead05bd3a55a9 > change-id: 20250728-kasan-tsbrcu-noquarantine-test-5c723367e056 > prerequisite-change-id: 20250723-kasan-tsbrcu-noquarantine-e207bb990e24:v1 > prerequisite-patch-id: 4fab9d3a121bfcaacc32a40f606b7c04e0c6fdd0 >