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 50180C4321E for ; Mon, 5 Dec 2022 10:54:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D25808E0002; Mon, 5 Dec 2022 05:54:45 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id CD6298E0001; Mon, 5 Dec 2022 05:54:45 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B9DFA8E0002; Mon, 5 Dec 2022 05:54:45 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id AABEE8E0001 for ; Mon, 5 Dec 2022 05:54:45 -0500 (EST) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 7F120C0AA0 for ; Mon, 5 Dec 2022 10:54:45 +0000 (UTC) X-FDA: 80207944530.04.F03D86D Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) by imf05.hostedemail.com (Postfix) with ESMTP id 2B292100012 for ; Mon, 5 Dec 2022 10:54:43 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none); spf=pass (imf05.hostedemail.com: domain of 3882NYwkbAOgcijUKVVObKZZSN.QYYQVOecObMYXdOXd.MYW@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.166.200 as permitted sender) smtp.mailfrom=3882NYwkbAOgcijUKVVObKZZSN.QYYQVOecObMYXdOXd.MYW@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1670237684; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references; bh=+m33asfuiIbtHGCOd5vafMunu1Eq4jlSsL/BLNeMeFU=; b=8YjpV6idHROtSaRsNWMjQrbySBH/1+1tXGjgc6nQomWt6yNG9HqyV7dG/xr3B6xOd8Pjz6 moZT52TDKBgvG/hROo6PtkDHQv5ZKnoevY73b4CkHseXEphYCbnaSvP0NLlJfhkk8tHTE7 VLfgGr/DQPBlvWS9QOgBubpMcKx6Zw4= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none); spf=pass (imf05.hostedemail.com: domain of 3882NYwkbAOgcijUKVVObKZZSN.QYYQVOecObMYXdOXd.MYW@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.166.200 as permitted sender) smtp.mailfrom=3882NYwkbAOgcijUKVVObKZZSN.QYYQVOecObMYXdOXd.MYW@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1670237684; a=rsa-sha256; cv=none; b=OcrY2N7C5DrR6l5JCvWQXtW7D4nS8Ak5OaLalmRxDi356bqilVx8m3vPFtUWf0RwoRJXqc oR4m1G/lYf2Eh6x1cq85NRU9zkYwbmAh7GMnl7eYnBIgI2yyiecyHijGcSBz2aNcnxowZp Uq0GBKn6+NTQysdswPX0D8pF1ywO1lw= Received: by mail-il1-f200.google.com with SMTP id z10-20020a921a4a000000b0030349fa9653so5554740ill.7 for ; Mon, 05 Dec 2022 02:54:43 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=+m33asfuiIbtHGCOd5vafMunu1Eq4jlSsL/BLNeMeFU=; b=j3GqDUmDdiCU5IqmKp3OQXRLUxAjC0G7x1SgJkfUbj6LClWaUVBzjxBYtPMkk5XdxR fGGqRidvZZvhOD+/5ICOek/IMQBMf9/4m65Iz9+u8Q9ZcYAj1vZJzSMlS+Q78Clx27Ee mDOVRYRS2YwCGzXIuBR1/mWn1iIbmk+108VnpXbi31jSROYL/DXGr5Nd3P3YcohoKeSd S8T8Lf4uB+H/t6qF5LAaDWCI8rqU5+AHKsQ379Pcn8p4IHyrFRuNgFVqxMSlKuFywKOP m1/xO1mX+/vBKBElC5mqeGjfZvEVvYSdeKPG6rAsghJpuLDZ5Wd1QtntrYhbQHPY4Zs+ O86Q== X-Gm-Message-State: ANoB5pmIQd0f5qxbeSa/c6NZpa1l8H+f9/LJgWbAVxra/7SYQzov4zVl JN696YGZEfWmjRXwRPf8go019mHLqC/tWtYB9vYGDPcX1mCi X-Google-Smtp-Source: AA0mqf4FEXN6vbrR7z1mOCUjOkrNtF5tTaDRPDIFb+HY5lvm52k8a7dk7KWKV6Xwk1Tfbjuhc8ql2ovW7CQC38y7m2axgAVzCGqr MIME-Version: 1.0 X-Received: by 2002:a02:b38c:0:b0:389:b9a5:f14a with SMTP id p12-20020a02b38c000000b00389b9a5f14amr21176938jan.98.1670237683531; Mon, 05 Dec 2022 02:54:43 -0800 (PST) Date: Mon, 05 Dec 2022 02:54:43 -0800 In-Reply-To: <000000000000d6fae905eb9bf51f@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d1487305ef1283bc@google.com> Subject: Re: [syzbot] KASAN: slab-out-of-bounds Read in mas_leaf_max_gap From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 2B292100012 X-Stat-Signature: zkbeu4y14qe56wotak9ci1rfbx8tu5df X-Spamd-Result: default: False [-0.50 / 9.00]; BAYES_HAM(-6.00)[100.00%]; SORBS_IRL_BL(3.00)[209.85.166.200:from]; URI_HIDDEN_PATH(1.00)[https://syzkaller.appspot.com/x/.config?x=11e19c740a0b2926]; SUBJECT_HAS_UNDERSCORES(1.00)[]; FORGED_SENDER(0.30)[syzbot@syzkaller.appspotmail.com,3882NYwkbAOgcijUKVVObKZZSN.QYYQVOecObMYXdOXd.MYW@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com]; RCVD_NO_TLS_LAST(0.10)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_POLICY_SOFTFAIL(0.10)[appspotmail.com : SPF not aligned (relaxed), No valid DKIM,none]; BAD_REP_POLICIES(0.10)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TAGGED_FROM(0.00)[d915173f90391a04af27]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_NONE(0.00)[]; FROM_NEQ_ENVFROM(0.00)[syzbot@syzkaller.appspotmail.com,3882NYwkbAOgcijUKVVObKZZSN.QYYQVOecObMYXdOXd.MYW@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com]; FROM_HAS_DN(0.00)[]; ARC_SIGNED(0.00)[hostedemail.com:s=arc-20220608:i=1]; RCPT_COUNT_THREE(0.00)[4]; PREVIOUSLY_DELIVERED(0.00)[linux-mm@kvack.org]; R_SPF_ALLOW(0.00)[+ip4:209.85.128.0/17]; ARC_NA(0.00)[] X-HE-Tag: 1670237683-462256 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: syzbot has found a reproducer for the following issue on: HEAD commit: 9e46a7996732 Add linux-next specific files for 20221125 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1656ef7b880000 kernel config: https://syzkaller.appspot.com/x/.config?x=11e19c740a0b2926 dashboard link: https://syzkaller.appspot.com/bug?extid=d915173f90391a04af27 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1050206d880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/758d818cf966/disk-9e46a799.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f7c8696b40a5/vmlinux-9e46a799.xz kernel image: https://storage.googleapis.com/syzbot-assets/810f9750b87f/bzImage-9e46a799.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d915173f90391a04af27@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in mas_leaf_max_gap+0x5b1/0x6a0 lib/maple_tree.c:1508 Read of size 8 at addr ffff88807b5d8100 by task syz-executor.1/5436 CPU: 0 PID: 5436 Comm: syz-executor.1 Not tainted 6.1.0-rc6-next-20221125-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:253 [inline] print_report+0x15e/0x45d mm/kasan/report.c:364 kasan_report+0xbf/0x1f0 mm/kasan/report.c:464 mas_leaf_max_gap+0x5b1/0x6a0 lib/maple_tree.c:1508 mas_max_gap lib/maple_tree.c:1569 [inline] mab_set_b_end lib/maple_tree.c:2648 [inline] mas_spanning_rebalance.isra.0+0x4714/0x60a0 lib/maple_tree.c:3038 mas_wr_spanning_store.isra.0+0x5c8/0xfc0 lib/maple_tree.c:4045 mas_wr_store_entry.isra.0+0xb3f/0xfd0 lib/maple_tree.c:4387 mas_store_prealloc+0xb3/0x150 lib/maple_tree.c:5704 do_mas_align_munmap+0xb54/0x1260 mm/mmap.c:2428 do_mas_munmap+0x26e/0x2c0 mm/mmap.c:2502 __vm_munmap+0x14f/0x290 mm/mmap.c:2779 __do_sys_munmap mm/mmap.c:2804 [inline] __se_sys_munmap mm/mmap.c:2801 [inline] __x64_sys_munmap+0xd5/0x100 mm/mmap.c:2801 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4c0de8c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4c0ec22168 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 00007f4c0dfac120 RCX: 00007f4c0de8c0d9 RDX: 0000000000000000 RSI: 00007fffdf3a3000 RDI: 0000000020c5c000 RBP: 00007f4c0dee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffb2d4d94f R14: 00007f4c0ec22300 R15: 0000000000022000 Allocated by task 5436: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:330 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] kmem_cache_alloc_bulk+0x3fd/0x850 mm/slub.c:3889 mt_alloc_bulk lib/maple_tree.c:157 [inline] mas_alloc_nodes+0x309/0x810 lib/maple_tree.c:1256 mas_node_count_gfp lib/maple_tree.c:1315 [inline] mas_preallocate+0x1bb/0x360 lib/maple_tree.c:5722 do_mas_align_munmap+0x129/0x1260 mm/mmap.c:2314 do_mas_munmap+0x26e/0x2c0 mm/mmap.c:2502 __vm_munmap+0x14f/0x290 mm/mmap.c:2779 __do_sys_munmap mm/mmap.c:2804 [inline] __se_sys_munmap mm/mmap.c:2801 [inline] __x64_sys_munmap+0xd5/0x100 mm/mmap.c:2801 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807b5d8000 which belongs to the cache maple_node of size 256 The buggy address is located 0 bytes to the right of 256-byte region [ffff88807b5d8000, ffff88807b5d8100) The buggy address belongs to the physical page: page:ffffea0001ed7600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b5d8 head:ffffea0001ed7600 order:1 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff8880124cd000 ffffea0000768300 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5001, tgid 5001 (dhcpcd-run-hook), ts 35284488309, free_ts 32325472910 prep_new_page mm/page_alloc.c:2541 [inline] get_page_from_freelist+0x119c/0x2cd0 mm/page_alloc.c:4293 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5551 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1833 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1980 new_slab mm/slub.c:2033 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3211 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3310 slab_alloc_node mm/slub.c:3395 [inline] slab_alloc mm/slub.c:3441 [inline] __kmem_cache_alloc_lru mm/slub.c:3448 [inline] kmem_cache_alloc+0x378/0x430 mm/slub.c:3457 mt_alloc_one lib/maple_tree.c:152 [inline] mas_alloc_nodes+0x429/0x810 lib/maple_tree.c:1231 mas_node_count_gfp lib/maple_tree.c:1315 [inline] mas_preallocate+0x1bb/0x360 lib/maple_tree.c:5722 mmap_region+0x770/0x1dd0 mm/mmap.c:2683 do_mmap+0x831/0xf60 mm/mmap.c:1412 vm_mmap_pgoff+0x1af/0x280 mm/util.c:520 ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1458 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1448 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1498 free_unref_page_prepare mm/page_alloc.c:3379 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3474 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2617 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:307 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3433 [inline] slab_alloc mm/slub.c:3441 [inline] __kmem_cache_alloc_lru mm/slub.c:3448 [inline] kmem_cache_alloc+0x1e3/0x430 mm/slub.c:3457 vm_area_alloc+0x20/0x100 kernel/fork.c:458 mmap_region+0x44c/0x1dd0 mm/mmap.c:2605 do_mmap+0x831/0xf60 mm/mmap.c:1412 vm_mmap_pgoff+0x1af/0x280 mm/util.c:520 ksys_mmap_pgoff+0x7d/0x5a0 mm/mmap.c:1458 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807b5d8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b5d8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807b5d8100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807b5d8180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807b5d8200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================