From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f180.google.com (mail-pg1-f180.google.com [209.85.215.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D10C5248864; Wed, 11 Jun 2025 21:40:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749678057; cv=none; b=PlnE9w2jdQhyOQVP57swqqM86u2s1BlqqoJuJVOAV5MHgRARUcwyOJrnU4WZDP7fRgGJ5heV01erzIwR7YLhhaIEt9VKJoypyawPPLjqoc+RBMfd07IOqD7PN7Z2ywhPD3ciUOuCGV4YGPpmFRba6mcz/Ijnd/5UhVEtmS3xtAw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749678057; c=relaxed/simple; bh=NGMQpewXqK7wOSzQXxAhgwNeQ860ld/Fy7wHeTmf5qE=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ZCIXSJjReZtaqI9xOOStqPQxCuIajhiYtcKgUIMGh11iZ5R24R6CNgoM7jK9HTidzp6ykcDsKjkfN6w7+xrb3RluzOobwKXfwIDEzYX4bcgdSRFyUdMHRcJZdnw43hBC+sSW1mvdNszap/ynzCd3megwTMksQG6hnunSby2/4tE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=KqCgwdPz; arc=none smtp.client-ip=209.85.215.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KqCgwdPz" Received: by mail-pg1-f180.google.com with SMTP id 41be03b00d2f7-b26d7ddbfd7so233090a12.0; Wed, 11 Jun 2025 14:40:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1749678055; x=1750282855; darn=vger.kernel.org; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:to:from:subject:message-id:from:to:cc:subject:date :message-id:reply-to; bh=Uwah7JnOOjZKU0Tx+3NnoQcDku9HhLIL23Wwwgfqd5k=; b=KqCgwdPzOOeqyM80QFVrGvmeGH10esoQqJNECaiV0AvYkmQbd4EfQQ67Hg3z8b7kiE k+Md05iOfKvU0nIXOrvGqEFvpixscuMs7nHSSmlzT73TBLPvqe5YER0ceAyqLnITRMzc OV9PATsLkQAGP4Lx/LPJsy01c6eacKn0bEkPELatENy+FEA7cvSia1cNBtzWsD/lxyhC HUm5PM/cBQPsC7Tqt8l136oI1vcD0rT9Ms5MpdKUMr+KX0cfzz1jQlyloyD/vFntM+bn 7j8kJcH0OVhl/WdVU1rBYwAdqK026E4+BCZS8WaeNGcvgowYbv/zzyeeiUoY0T98bdQC oGgQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749678055; x=1750282855; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:to:from:subject:message-id:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=Uwah7JnOOjZKU0Tx+3NnoQcDku9HhLIL23Wwwgfqd5k=; b=S3JwXWC4EhxMhhP8IrC1DX1nHiJBCmFYmB3LZoGPIgTYFR7b5D3+7Y2Kt6aZQxHtB8 Vai/bJFrl58//S+VJJZ05rdj7yWv7L7Vyyje6O8OrPkZc47fTC1h/aoP4I3kDlun3DF7 /YqAJtQytiIiPACZ4yRri+D/9rYaoCfP4tYMz1Dt3OPp2boaX4rqKSml75ehb/Uq2kPS rvqfNM5czFhlMweNoBgVTL/G/CoJUutGhOd0fD4e/2mFuZyjRA8/6o5wXvoFIvymIwjJ aQPt8DlJRJjIVImYwdDoG3c6wy0mY0rU8u//Vubln37pNzpk6rnW0u11hQoIHtEcnX9W bDcg== X-Forwarded-Encrypted: i=1; AJvYcCV+yDkrchYJMhI+8gIDfTDIcBp+ztxGGumbHkpe3OKU2RcoHoVjmav6/YlytbHibkqKPD03pyh8C+qSO9r/@vger.kernel.org, AJvYcCW5Hd4TldTyI4MwbUmwqXHX7mjm/Vl7Js6cEqG2L7e2qECbh0Qa3DDxdKbuTDWf9ka91ak=@vger.kernel.org X-Gm-Message-State: AOJu0Yw4m+5/A2C/C21OXTpWLkoDoJT2Fx0Xe5s8Adgtz3OH0ez6ZeXB ofLVgEsGtfW8KCKkaeNoKNTN4ycdmNkHUv4440AMLQDSYac5384ChBpY X-Gm-Gg: ASbGncu8zG0fvBUnrOp6EXakYPSpxlBtmXbW6Kq3E6fwn672HOvsKJAITOaknHbU7LX n0Ng7OYE81sIsUNFdJcblQxab7KZKt30MvFvRA549Xj05WQkvDGOBU0QGchb+IxG9/2pOTwuQkD 4vuS/ClMppigYoWXT9tv5AZsQuaIbkginkLhEO0gO1EUAD4ZJ1z/uJxbaInsKfaEYvO91un2Y/H BaQ3+piFS86B76mPgjAixluXgl6wQj5lERpYgLqbEoG3t04mTwBKZdV4P23RBgHgL6Oj4MaWIeG L8wB4zRGrDjJ80tZBm44WXJ9xFxeK2onPjwYpZsuH0sHwcp7NwI5Hebb/KIUGPQT/T8Z50wgWAB OzyoEBSDUkGTUrTWLDO3z X-Google-Smtp-Source: AGHT+IGiXuhUjD32nfI01PxlHh1zwnDAf32d5oWwFMpajFVw+7qFTEene9b+OKtkMyxnyi/1inMBGQ== X-Received: by 2002:a05:6a20:729c:b0:1ee:efa5:6573 with SMTP id adf61e73a8af0-21f86600846mr7376990637.8.1749678054950; Wed, 11 Jun 2025 14:40:54 -0700 (PDT) Received: from ?IPv6:2a03:83e0:115c:1:b1d2:545:de25:d977? ([2620:10d:c090:500::7:d234]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b2fd613cfa3sm55689a12.21.2025.06.11.14.40.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Jun 2025 14:40:54 -0700 (PDT) Message-ID: <26122837c64946d89cb5d0a3a568bdc2b4854ba6.camel@gmail.com> Subject: Re: [syzbot] [bpf?] KASAN: slab-use-after-free Read in do_check From: Eduard Zingerman To: syzbot , andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Date: Wed, 11 Jun 2025 14:40:52 -0700 In-Reply-To: <68497853.050a0220.33aa0e.036a.GAE@google.com> References: <68497853.050a0220.33aa0e.036a.GAE@google.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-06-11 at 05:36 -0700, syzbot wrote: > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: 19a60293b992 Add linux-next specific files for 20250611 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D15472d7058000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D76ed3656d7159= e27 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Db5eb72a560b8149= a1885 > compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e0775= 7-1~exp1~20250514183223.118), Debian LLD 20.1.6 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D16af860c580= 000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D174db60c58000= 0 >=20 > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/c453c11565fa/dis= k-19a60293.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4034ded42b2e/vmlinu= x-19a60293.xz > kernel image: https://storage.googleapis.com/syzbot-assets/5355903cdb8f/b= zImage-19a60293.xz >=20 > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+b5eb72a560b8149a1885@syzkaller.appspotmail.com >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > BUG: KASAN: slab-use-after-free in do_check+0xb388/0xe170 kernel/bpf/veri= fier.c:19756 > Read of size 1 at addr ffff88801deeef79 by task syz-executor672/5842 >=20 > CPU: 1 UID: 0 PID: 5842 Comm: syz-executor672 Not tainted 6.16.0-rc1-next= -20250611-syzkaller #0 PREEMPT(full)=20 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G= oogle 05/07/2025 > Call Trace: > > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:408 [inline] > print_report+0xd2/0x2b0 mm/kasan/report.c:521 > kasan_report+0x118/0x150 mm/kasan/report.c:634 > do_check+0xb388/0xe170 kernel/bpf/verifier.c:19756 > do_check_common+0x168d/0x20b0 kernel/bpf/verifier.c:22905 > do_check_main kernel/bpf/verifier.c:22996 [inline] > bpf_check+0x1381e/0x19e50 kernel/bpf/verifier.c:24162 > bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2972 > __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5978 > __do_sys_bpf kernel/bpf/syscall.c:6085 [inline] > __se_sys_bpf kernel/bpf/syscall.c:6083 [inline] > __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6083 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f7586cdbeb9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f= 7 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:00007ffc2e683128 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7586cdbeb9 > RDX: 0000000000000094 RSI: 0000200000000840 RDI: 0000000000000005 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000006 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 > >=20 > Allocated by task 5842: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 > poison_kmalloc_redzone mm/kasan/common.c:377 [inline] > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 > kasan_kmalloc include/linux/kasan.h:260 [inline] > __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4359 > kmalloc_noprof include/linux/slab.h:905 [inline] > kzalloc_noprof include/linux/slab.h:1039 [inline] > do_check_common+0x13f/0x20b0 kernel/bpf/verifier.c:22798 > do_check_main kernel/bpf/verifier.c:22996 [inline] > bpf_check+0x1381e/0x19e50 kernel/bpf/verifier.c:24162 > bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2972 > __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5978 > __do_sys_bpf kernel/bpf/syscall.c:6085 [inline] > __se_sys_bpf kernel/bpf/syscall.c:6083 [inline] > __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6083 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > Freed by task 5842: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 > kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 > poison_slab_object mm/kasan/common.c:247 [inline] > __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 > kasan_slab_free include/linux/kasan.h:233 [inline] > slab_free_hook mm/slub.c:2381 [inline] > slab_free mm/slub.c:4643 [inline] > kfree+0x18e/0x440 mm/slub.c:4842 > push_stack+0x247/0x3c0 kernel/bpf/verifier.c:2069 > check_cond_jmp_op+0x1069/0x2340 kernel/bpf/verifier.c:16562 > do_check_insn kernel/bpf/verifier.c:19621 [inline] > do_check+0x672c/0xe170 kernel/bpf/verifier.c:19755 > do_check_common+0x168d/0x20b0 kernel/bpf/verifier.c:22905 > do_check_main kernel/bpf/verifier.c:22996 [inline] > bpf_check+0x1381e/0x19e50 kernel/bpf/verifier.c:24162 > bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2972 > __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5978 > __do_sys_bpf kernel/bpf/syscall.c:6085 [inline] > __se_sys_bpf kernel/bpf/syscall.c:6083 [inline] > __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6083 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > The buggy address belongs to the object at ffff88801deeef00 > which belongs to the cache kmalloc-192 of size 192 > The buggy address is located 121 bytes inside of > freed 192-byte region [ffff88801deeef00, ffff88801deeefc0) >=20 > The buggy address belongs to the physical page: > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dee= e > flags: 0xfff00000000000(node=3D0|zone=3D1|lastcpupid=3D0x7ff) > page_type: f5(slab) > raw: 00fff00000000000 ffff88801a4413c0 ffffea00006fca40 dead000000000004 > raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(= GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0= ), ts 2954361175, free_ts 2954343552 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 > prep_new_page mm/page_alloc.c:1712 [inline] > get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 > __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 > alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 > alloc_slab_page mm/slub.c:2451 [inline] > allocate_slab+0x8a/0x3b0 mm/slub.c:2619 > new_slab mm/slub.c:2673 [inline] > ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 > __slab_alloc mm/slub.c:3949 [inline] > __slab_alloc_node mm/slub.c:4024 [inline] > slab_alloc_node mm/slub.c:4185 [inline] > __do_kmalloc_node mm/slub.c:4327 [inline] > __kmalloc_node_noprof+0x2fd/0x4e0 mm/slub.c:4334 > kmalloc_node_noprof include/linux/slab.h:932 [inline] > __vmalloc_area_node mm/vmalloc.c:3690 [inline] > __vmalloc_node_range_noprof+0x5a9/0x12f0 mm/vmalloc.c:3885 > vmalloc_huge_node_noprof+0xb3/0xf0 mm/vmalloc.c:4001 > vmalloc_huge include/linux/vmalloc.h:185 [inline] > alloc_large_system_hash+0x2b8/0x5e0 mm/mm_init.c:2515 > posixtimer_init+0x140/0x270 kernel/time/posix-timers.c:1561 > do_one_initcall+0x233/0x820 init/main.c:1274 > do_initcall_level+0x137/0x1f0 init/main.c:1336 > do_initcalls+0x69/0xd0 init/main.c:1352 > kernel_init_freeable+0x3d9/0x570 init/main.c:1584 > kernel_init+0x1d/0x1d0 init/main.c:1474 > page last free pid 1 tgid 1 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1248 [inline] > __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 > __kasan_populate_vmalloc mm/kasan/shadow.c:383 [inline] > kasan_populate_vmalloc+0x18a/0x1a0 mm/kasan/shadow.c:417 > alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2084 > __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3179 > __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3845 > vmalloc_huge_node_noprof+0xb3/0xf0 mm/vmalloc.c:4001 > vmalloc_huge include/linux/vmalloc.h:185 [inline] > alloc_large_system_hash+0x2b8/0x5e0 mm/mm_init.c:2515 > posixtimer_init+0x140/0x270 kernel/time/posix-timers.c:1561 > do_one_initcall+0x233/0x820 init/main.c:1274 > do_initcall_level+0x137/0x1f0 init/main.c:1336 > do_initcalls+0x69/0xd0 init/main.c:1352 > kernel_init_freeable+0x3d9/0x570 init/main.c:1584 > kernel_init+0x1d/0x1d0 init/main.c:1474 > ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 >=20 > Memory state around the buggy address: > ffff88801deeee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88801deeee80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc > > ffff88801deeef00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff88801deeef80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff88801deef000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 >=20 > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. >=20 > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >=20 > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title >=20 > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. >=20 > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) >=20 > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report >=20 > If you want to undo deduplication, reply with: > #syz undup #syz test: git@github.com:kernel-patches/bpf.git 974c296e39c3b2462bbf1f926d= 5a5db64399359f