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 5CC66C433EF for ; Mon, 14 Feb 2022 10:44:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CD8CF6B0072; Mon, 14 Feb 2022 05:44:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C87376B0073; Mon, 14 Feb 2022 05:44:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B76786B0078; Mon, 14 Feb 2022 05:44:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0204.hostedemail.com [216.40.44.204]) by kanga.kvack.org (Postfix) with ESMTP id A93C36B0072 for ; Mon, 14 Feb 2022 05:44:23 -0500 (EST) Received: from smtpin31.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 575D995AFD for ; Mon, 14 Feb 2022 10:44:23 +0000 (UTC) X-FDA: 79141051206.31.621A0CB Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) by imf12.hostedemail.com (Postfix) with ESMTP id E984940004 for ; Mon, 14 Feb 2022 10:44:22 +0000 (UTC) Received: by mail-il1-f199.google.com with SMTP id q15-20020a92ca4f000000b002be3e7707ffso11092181ilo.4 for ; Mon, 14 Feb 2022 02:44:22 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=U/K75PKZ7oRwBSg0DraF4Jz5emwI9maCTepHYeXlOoM=; b=ez56ZX7PIETm0TF7ZocfvkbGiYCZ5GRY8BbS5XMn2eGAySezUv7dhOtphhH9iQNuwP Ugqw6sGHF37FVMgeHuBdudgUrWok7TZz7/+RGH0fl0IRPqU2tWtDeo34nWusgtpgXdyX my+QT9Gne1hsSnl/7Rg12osWCaNCx8eHC/rCtC0hVkwTW0vzzhgwtoug+vN4h8x7VRhD QQ/ZxzhXJTwbXqSyQ/B99Ds7FyR+tURAYM34RIyGCjzj1QH2XzdYZVm1YuuDP+E8UYG9 LbLrqQJMn4ppzn0JGj2DzOygpByRaA0nb8QLvm4TluxanqT4FvoLgPCXyGF46Hhfcr9J 1hEw== X-Gm-Message-State: AOAM532Z8WQI9HxuFal6XXZz/ubGHx471esuKmEG4pEEOFZau/hgLsSK OqK4XTvkKyPRKYOkdhzwEqZ2u7ssitkxqYyoXtWE9eWg+DmT X-Google-Smtp-Source: ABdhPJxyUdi3Tb42Ir4UEK58TVXzU+k9ISfC3Jdy2Vc8F5tPwmm5O23GuYMKZpQy2tRDFj3A7smJGdWu2vJWursXva7qLI+JGyQN MIME-Version: 1.0 X-Received: by 2002:a02:a112:: with SMTP id f18mr7608688jag.51.1644835462375; Mon, 14 Feb 2022 02:44:22 -0800 (PST) Date: Mon, 14 Feb 2022 02:44:22 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000072ef2c05d7f81950@google.com> Subject: [syzbot] KASAN: use-after-free Read in __oom_reap_task_mm From: syzbot To: akpm@linux-foundation.org, brauner@kernel.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: rspam08 X-Rspamd-Queue-Id: E984940004 X-Stat-Signature: sd6owk3ac5bqsopf6eswmft9e5yap4j9 Authentication-Results: imf12.hostedemail.com; dkim=none; spf=pass (imf12.hostedemail.com: domain of 3hjIKYgkbACsZfgRHSSLYHWWPK.NVVNSLbZLYJVUaLUa.JVT@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.166.199 as permitted sender) smtp.mailfrom=3hjIKYgkbACsZfgRHSSLYHWWPK.NVVNSLbZLYJVUaLUa.JVT@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none) X-HE-Tag: 1644835462-726034 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: Hello, syzbot found the following issue on: HEAD commit: e6251ab4551f Merge tag 'nfs-for-5.17-2' of git://git.linux.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1229b2f8700000 kernel config: https://syzkaller.appspot.com/x/.config?x=266de9da75c71a45 dashboard link: https://syzkaller.appspot.com/bug?extid=2ccf63a4bd07cf39cab0 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2ccf63a4bd07cf39cab0@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in can_madv_lru_vma mm/internal.h:76 [inline] BUG: KASAN: use-after-free in __oom_reap_task_mm+0x3a4/0x400 mm/oom_kill.c:529 Read of size 8 at addr ffff88807b868ba8 by task syz-executor.2/12778 CPU: 0 PID: 12778 Comm: syz-executor.2 Not tainted 5.17.0-rc3-syzkaller-00029-ge6251ab4551f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 can_madv_lru_vma mm/internal.h:76 [inline] __oom_reap_task_mm+0x3a4/0x400 mm/oom_kill.c:529 __do_sys_process_mrelease+0x3f2/0x450 mm/oom_kill.c:1196 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6e70549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f586a5cc EFLAGS: 00000296 ORIG_RAX: 00000000000001c0 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 12778: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243 vm_area_dup+0x88/0x2b0 kernel/fork.c:357 dup_mmap kernel/fork.c:554 [inline] dup_mm+0x5fa/0x13e0 kernel/fork.c:1451 copy_mm kernel/fork.c:1503 [inline] copy_process+0x71f8/0x7300 kernel/fork.c:2164 kernel_clone+0xe7/0xab0 kernel/fork.c:2555 __do_compat_sys_ia32_clone+0xac/0xe0 arch/x86/kernel/sys_ia32.c:254 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Freed by task 12780: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x130/0x160 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kmem_cache_free+0xd8/0x340 mm/slub.c:3526 remove_vma+0x135/0x170 mm/mmap.c:189 exit_mmap+0x29a/0x670 mm/mmap.c:3186 __mmput+0x122/0x4b0 kernel/fork.c:1114 mmput+0x56/0x60 kernel/fork.c:1135 exit_mm kernel/exit.c:507 [inline] do_exit+0xa3c/0x2a30 kernel/exit.c:793 do_group_exit+0xd2/0x2f0 kernel/exit.c:935 get_signal+0x4b0/0x28c0 kernel/signal.c:2862 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff88807b868b58 which belongs to the cache vm_area_struct of size 200 The buggy address is located 80 bytes inside of 200-byte region [ffff88807b868b58, ffff88807b868c20) The buggy address belongs to the page: page:ffffea0001ee1a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b868 memcg:ffff88804fe94a01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888140006a00 raw: 0000000000000000 00000000000f000f 00000001ffffffff ffff88804fe94a01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3175, ts 344170603641, free_ts 344164018467 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28a/0x3b0 mm/slub.c:2004 ___slab_alloc+0x87c/0xe90 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3243 vm_area_dup+0x88/0x2b0 kernel/fork.c:357 dup_mmap kernel/fork.c:554 [inline] dup_mm+0x5fa/0x13e0 kernel/fork.c:1451 copy_mm kernel/fork.c:1503 [inline] copy_process+0x71f8/0x7300 kernel/fork.c:2164 kernel_clone+0xe7/0xab0 kernel/fork.c:2555 __do_sys_clone+0xc8/0x110 kernel/fork.c:2672 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page_list+0x1a9/0xfa0 mm/page_alloc.c:3441 release_pages+0x317/0x1220 mm/swap.c:980 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:243 [inline] tlb_flush_mmu mm/mmu_gather.c:250 [inline] tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:341 exit_mmap+0x21b/0x670 mm/mmap.c:3180 __mmput+0x122/0x4b0 kernel/fork.c:1114 mmput+0x56/0x60 kernel/fork.c:1135 exit_mm kernel/exit.c:507 [inline] do_exit+0xa3c/0x2a30 kernel/exit.c:793 do_group_exit+0xd2/0x2f0 kernel/exit.c:935 get_signal+0x4b0/0x28c0 kernel/signal.c:2862 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Memory state around the buggy address: ffff88807b868a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b868b00: fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb >ffff88807b868b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b868c00: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb ffff88807b868c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- This report is generated by a bot. 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