From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by kanga.kvack.org (Postfix) with ESMTP id 28D7B8E0001 for ; Mon, 21 Jan 2019 01:45:05 -0500 (EST) Received: by mail-io1-f71.google.com with SMTP id p4so15994582iod.17 for ; Sun, 20 Jan 2019 22:45:05 -0800 (PST) Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id v134sor18547197itb.19.2019.01.20.22.45.03 for (Google Transport Security); Sun, 20 Jan 2019 22:45:03 -0800 (PST) MIME-Version: 1.0 Date: Sun, 20 Jan 2019 22:45:03 -0800 Message-ID: <0000000000005676f8057ff2335f@google.com> Subject: KASAN: use-after-free Read in oom_kill_process From: syzbot Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, ebiederm@xmission.com, guro@fb.com, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, rientjes@google.com, syzkaller-bugs@googlegroups.com, yuzhoujian@didichuxing.com Hello, syzbot found the following crash on: HEAD commit: 47bfa6d9dc8c Merge tag 'selinux-pr-20190115' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=123af46b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a4dffabfb4e36f9 dashboard link: https://syzkaller.appspot.com/bug?extid=7fbbfa368521945f0e3d compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7fbbfa368521945f0e3d@syzkaller.appspotmail.com kmem: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: cache:28KB rss:274692KB rss_huge:190464KB shmem:64KB mapped_file:0KB dirty:0KB writeback:0KB swap:0KB inactive_anon:222780KB active_anon:4152KB inactive_file:0KB active_file:0KB unevictable:47872KB oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=syz1,mems_allowed=0-1,oom_memcg=/syz1,task_memcg=/syz1,task=syz-executor1,pid=15858,uid=0 Memory cgroup out of memory: Kill process 15858 (syz-executor1) score 1148 or sacrifice child ================================================================== BUG: KASAN: use-after-free in oom_kill_process.cold+0x484/0x9d4 mm/oom_kill.c:978 Read of size 8 at addr ffff8880595f6c40 by task syz-executor1/15817 CPU: 1 PID: 15817 Comm: syz-executor1 Not tainted 5.0.0-rc2+ #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 oom_kill_process.cold+0x484/0x9d4 mm/oom_kill.c:978 out_of_memory+0x885/0x1420 mm/oom_kill.c:1133 mem_cgroup_out_of_memory+0x160/0x210 mm/memcontrol.c:1393 mem_cgroup_oom mm/memcontrol.c:1721 [inline] try_charge+0xd44/0x19b0 mm/memcontrol.c:2283 memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2591 memcg_kmem_charge+0x13b/0x340 mm/memcontrol.c:2624 __alloc_pages_nodemask+0x7b8/0xdc0 mm/page_alloc.c:4559 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_node include/linux/gfp.h:500 [inline] alloc_thread_stack_node kernel/fork.c:246 [inline] dup_task_struct kernel/fork.c:849 [inline] copy_process+0x847/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f36f091cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457ec9 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000073bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f36f091d6d4 R13: 00000000004be2a0 R14: 00000000004ce760 R15: 00000000ffffffff Allocated by task 15809: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc_node+0x144/0x710 mm/slab.c:3633 alloc_task_struct_node kernel/fork.c:158 [inline] dup_task_struct kernel/fork.c:845 [inline] copy_process+0x405b/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 15817: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 free_task_struct kernel/fork.c:163 [inline] free_task+0x170/0x1f0 kernel/fork.c:458 __put_task_struct+0x2e0/0x630 kernel/fork.c:731 put_task_struct+0x4b/0x60 include/linux/sched/task.h:98 oom_kill_process.cold+0x93a/0x9d4 mm/oom_kill.c:990 out_of_memory+0x885/0x1420 mm/oom_kill.c:1133 mem_cgroup_out_of_memory+0x160/0x210 mm/memcontrol.c:1393 mem_cgroup_oom mm/memcontrol.c:1721 [inline] try_charge+0xd44/0x19b0 mm/memcontrol.c:2283 memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2591 memcg_kmem_charge+0x13b/0x340 mm/memcontrol.c:2624 __alloc_pages_nodemask+0x7b8/0xdc0 mm/page_alloc.c:4559 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_node include/linux/gfp.h:500 [inline] alloc_thread_stack_node kernel/fork.c:246 [inline] dup_task_struct kernel/fork.c:849 [inline] copy_process+0x847/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880595f6540 which belongs to the cache task_struct(33:syz1) of size 6080 The buggy address is located 1792 bytes inside of 6080-byte region [ffff8880595f6540, ffff8880595f7d00) The buggy address belongs to the page: page:ffffea0001657d80 count:1 mapcount:0 mapping:ffff888091f65840 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00028b3288 ffffea0002612788 ffff888091f65840 raw: 0000000000000000 ffff8880595f6540 0000000100000001 ffff888057fe2b00 page dumped because: kasan: bad access detected page->mem_cgroup:ffff888057fe2b00 Memory state around the buggy address: ffff8880595f6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880595f6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880595f6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880595f6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880595f6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 --- This bug 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. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. 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[209.85.220.69]) by mx.google.com with SMTPS id v134sor18547197itb.19.2019.01.20.22.45.03 for (Google Transport Security); Sun, 20 Jan 2019 22:45:03 -0800 (PST) Received-SPF: pass (google.com: domain of 3b2pfxakbaeiw23oeppivettmh.ksskpiywivgsrxirx.gsq@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3b2pfxakbaeiw23oeppivettmh.ksskpiywivgsrxirx.gsq@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3b2pFXAkbAEIw23oeppivettmh.ksskpiywivgsrxirx.gsq@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: ALg8bN7rpeMQsteiPlv5L/osvomJPscYDCa34a9qazyd2CZk3BmO/p4p7ZDlMV2H1aFcsq5zFRzq+EG5OK0iVZoFo7AnbFZkxREX MIME-Version: 1.0 X-Received: by 2002:a24:fe42:: with SMTP id w63mr19608276ith.13.1548053103667; Sun, 20 Jan 2019 22:45:03 -0800 (PST) Date: Sun, 20 Jan 2019 22:45:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005676f8057ff2335f@google.com> Subject: KASAN: use-after-free Read in oom_kill_process From: syzbot To: akpm@linux-foundation.org, ebiederm@xmission.com, guro@fb.com, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, rientjes@google.com, syzkaller-bugs@googlegroups.com, yuzhoujian@didichuxing.com Content-Type: text/plain; charset="UTF-8"; delsp="yes"; format="flowed" 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: Message-ID: <20190121064503.s9-J0fKtFrO33ohszV9JdFTfzIbLPhZK8yl09-CVl0U@z> Hello, syzbot found the following crash on: HEAD commit: 47bfa6d9dc8c Merge tag 'selinux-pr-20190115' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=123af46b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a4dffabfb4e36f9 dashboard link: https://syzkaller.appspot.com/bug?extid=7fbbfa368521945f0e3d compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7fbbfa368521945f0e3d@syzkaller.appspotmail.com kmem: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: cache:28KB rss:274692KB rss_huge:190464KB shmem:64KB mapped_file:0KB dirty:0KB writeback:0KB swap:0KB inactive_anon:222780KB active_anon:4152KB inactive_file:0KB active_file:0KB unevictable:47872KB oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=syz1,mems_allowed=0-1,oom_memcg=/syz1,task_memcg=/syz1,task=syz-executor1,pid=15858,uid=0 Memory cgroup out of memory: Kill process 15858 (syz-executor1) score 1148 or sacrifice child ================================================================== BUG: KASAN: use-after-free in oom_kill_process.cold+0x484/0x9d4 mm/oom_kill.c:978 Read of size 8 at addr ffff8880595f6c40 by task syz-executor1/15817 CPU: 1 PID: 15817 Comm: syz-executor1 Not tainted 5.0.0-rc2+ #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 oom_kill_process.cold+0x484/0x9d4 mm/oom_kill.c:978 out_of_memory+0x885/0x1420 mm/oom_kill.c:1133 mem_cgroup_out_of_memory+0x160/0x210 mm/memcontrol.c:1393 mem_cgroup_oom mm/memcontrol.c:1721 [inline] try_charge+0xd44/0x19b0 mm/memcontrol.c:2283 memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2591 memcg_kmem_charge+0x13b/0x340 mm/memcontrol.c:2624 __alloc_pages_nodemask+0x7b8/0xdc0 mm/page_alloc.c:4559 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_node include/linux/gfp.h:500 [inline] alloc_thread_stack_node kernel/fork.c:246 [inline] dup_task_struct kernel/fork.c:849 [inline] copy_process+0x847/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f36f091cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457ec9 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000073bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f36f091d6d4 R13: 00000000004be2a0 R14: 00000000004ce760 R15: 00000000ffffffff Allocated by task 15809: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc_node+0x144/0x710 mm/slab.c:3633 alloc_task_struct_node kernel/fork.c:158 [inline] dup_task_struct kernel/fork.c:845 [inline] copy_process+0x405b/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 15817: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 free_task_struct kernel/fork.c:163 [inline] free_task+0x170/0x1f0 kernel/fork.c:458 __put_task_struct+0x2e0/0x630 kernel/fork.c:731 put_task_struct+0x4b/0x60 include/linux/sched/task.h:98 oom_kill_process.cold+0x93a/0x9d4 mm/oom_kill.c:990 out_of_memory+0x885/0x1420 mm/oom_kill.c:1133 mem_cgroup_out_of_memory+0x160/0x210 mm/memcontrol.c:1393 mem_cgroup_oom mm/memcontrol.c:1721 [inline] try_charge+0xd44/0x19b0 mm/memcontrol.c:2283 memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2591 memcg_kmem_charge+0x13b/0x340 mm/memcontrol.c:2624 __alloc_pages_nodemask+0x7b8/0xdc0 mm/page_alloc.c:4559 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_node include/linux/gfp.h:500 [inline] alloc_thread_stack_node kernel/fork.c:246 [inline] dup_task_struct kernel/fork.c:849 [inline] copy_process+0x847/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880595f6540 which belongs to the cache task_struct(33:syz1) of size 6080 The buggy address is located 1792 bytes inside of 6080-byte region [ffff8880595f6540, ffff8880595f7d00) The buggy address belongs to the page: page:ffffea0001657d80 count:1 mapcount:0 mapping:ffff888091f65840 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00028b3288 ffffea0002612788 ffff888091f65840 raw: 0000000000000000 ffff8880595f6540 0000000100000001 ffff888057fe2b00 page dumped because: kasan: bad access detected page->mem_cgroup:ffff888057fe2b00 Memory state around the buggy address: ffff8880595f6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880595f6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880595f6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880595f6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880595f6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 --- This bug is generated by a bot. 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