Re: [syzbot] KASAN: use-after-free Write in expire_timers

From: Dmitry Vyukov
Date: Thu Nov 24 2022 - 01:30:14 EST

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On Mon, 21 Nov 2022 at 19:35, syzbot
<syzbot+38ee3533e07da8749f85@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: b6e7fdfd6f6a Merge tag 'iommu-fixes-v6.1-rc5' of git://git..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11c28f95880000
> kernel config: https://syzkaller.appspot.com/x/.config?x=95fb379f123ba8ce
> dashboard link: https://syzkaller.appspot.com/bug?extid=38ee3533e07da8749f85
> compiler: aarch64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm64
>
> 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+38ee3533e07da8749f85@xxxxxxxxxxxxxxxxxxxxxxxxx

Looks like an issue in NCI core.
+Krzysztof, Bongsu

> ==================================================================
> BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:885 [inline]
> BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:880 [inline]
> BUG: KASAN: use-after-free in expire_timers+0x74/0xc4 kernel/time/timer.c:1508
> Write at addr f8ff000005c37858 by task syz-executor.1/2271
> Pointer tag: [f8], memory tag: [fe]
>
> CPU: 0 PID: 2271 Comm: syz-executor.1 Not tainted 6.1.0-rc5-syzkaller-00320-gb6e7fdfd6f6a #0
> Hardware name: linux,dummy-virt (DT)
> Call trace:
> dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156
> dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline]
> show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106
> print_address_description mm/kasan/report.c:284 [inline]
> print_report+0x1a8/0x4a0 mm/kasan/report.c:395
> kasan_report+0x94/0xb4 mm/kasan/report.c:495
> __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320
> do_bad_area arch/arm64/mm/fault.c:473 [inline]
> do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749
> do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825
> el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367
> el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427
> el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576
> __hlist_del include/linux/list.h:885 [inline]
> detach_timer kernel/time/timer.c:880 [inline]
> expire_timers+0x74/0xc4 kernel/time/timer.c:1508
> __run_timers kernel/time/timer.c:1790 [inline]
> __run_timers kernel/time/timer.c:1763 [inline]
> run_timer_softirq+0xf4/0x254 kernel/time/timer.c:1803
> _stext+0x124/0x2a4
> ____do_softirq+0x10/0x20 arch/arm64/kernel/irq.c:79
> call_on_irq_stack+0x2c/0x5c arch/arm64/kernel/entry.S:889
> do_softirq_own_stack+0x1c/0x30 arch/arm64/kernel/irq.c:84
> invoke_softirq kernel/softirq.c:452 [inline]
> __irq_exit_rcu+0xcc/0xf4 kernel/softirq.c:650
> irq_exit_rcu+0x10/0x20 kernel/softirq.c:662
> el0_interrupt+0x54/0x104 arch/arm64/kernel/entry-common.c:717
> __el0_irq_handler_common+0x18/0x2c arch/arm64/kernel/entry-common.c:724
> el0t_64_irq_handler+0x10/0x20 arch/arm64/kernel/entry-common.c:729
> el0t_64_irq+0x198/0x19c arch/arm64/kernel/entry.S:582
>
> Allocated by task 3867:
> kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45
> save_stack_info+0x38/0x130 mm/kasan/tags.c:104
> kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:138
> ____kasan_kmalloc mm/kasan/common.c:371 [inline]
> ____kasan_kmalloc mm/kasan/common.c:330 [inline]
> __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:380
> kasan_kmalloc include/linux/kasan.h:211 [inline]
> kmalloc_trace+0x5c/0x70 mm/slab_common.c:1050
> kmalloc include/linux/slab.h:553 [inline]
> kzalloc include/linux/slab.h:689 [inline]
> nci_allocate_device net/nfc/nci/core.c:1157 [inline]
> nci_allocate_device+0x5c/0x170 net/nfc/nci/core.c:1143
> virtual_ncidev_open+0x54/0xe0 drivers/nfc/virtual_ncidev.c:139
> misc_open+0x124/0x170 drivers/char/misc.c:143
> chrdev_open+0xc0/0x260 fs/char_dev.c:414
> do_dentry_open+0x13c/0x4d0 fs/open.c:882
> vfs_open+0x2c/0x40 fs/open.c:1013
> do_open fs/namei.c:3557 [inline]
> path_openat+0x568/0xee0 fs/namei.c:3713
> do_filp_open+0x80/0x130 fs/namei.c:3740
> do_sys_openat2+0xb4/0x16c fs/open.c:1310
> do_sys_open fs/open.c:1326 [inline]
> __do_sys_openat fs/open.c:1342 [inline]
> __se_sys_openat fs/open.c:1337 [inline]
> __arm64_sys_openat+0x64/0xb0 fs/open.c:1337
> __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
> invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52
> el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142
> do_el0_svc+0x2c/0xd0 arch/arm64/kernel/syscall.c:206
> el0_svc+0x2c/0xb0 arch/arm64/kernel/entry-common.c:637
> el0t_64_sync_handler+0xb8/0xc0 arch/arm64/kernel/entry-common.c:655
> el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581
>
> Freed by task 3864:
> kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45
> save_stack_info+0x38/0x130 mm/kasan/tags.c:104
> kasan_save_free_info+0x18/0x30 mm/kasan/tags.c:143
> ____kasan_slab_free.constprop.0+0x1b8/0x230 mm/kasan/common.c:236
> __kasan_slab_free+0x10/0x1c mm/kasan/common.c:244
> kasan_slab_free include/linux/kasan.h:177 [inline]
> slab_free_hook mm/slub.c:1724 [inline]
> slab_free_freelist_hook+0xbc/0x1fc mm/slub.c:1750
> slab_free mm/slub.c:3661 [inline]
> __kmem_cache_free+0x16c/0x2ec mm/slub.c:3674
> kfree+0x60/0xb0 mm/slab_common.c:1007
> nci_free_device+0x30/0x40 net/nfc/nci/core.c:1205
> virtual_ncidev_close+0x74/0x80 drivers/nfc/virtual_ncidev.c:167
> __fput+0x78/0x260 fs/file_table.c:320
> ____fput+0x10/0x20 fs/file_table.c:348
> task_work_run+0x80/0xe0 kernel/task_work.c:179
> resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
> do_notify_resume+0x218/0x13b0 arch/arm64/kernel/signal.c:1127
> prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
> exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
> el0_svc+0xac/0xb0 arch/arm64/kernel/entry-common.c:638
> el0t_64_sync_handler+0xb8/0xc0 arch/arm64/kernel/entry-common.c:655
> el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581
>
> The buggy address belongs to the object at ffff000005c37800
> which belongs to the cache kmalloc-2k of size 2048
> The buggy address is located 88 bytes inside of
> 2048-byte region [ffff000005c37800, ffff000005c38000)
>
> The buggy address belongs to the physical page:
> page:000000007e5956af refcount:1 mapcount:0 mapping:0000000000000000 index:0xfcff000005c37800 pfn:0x45c30
> head:000000007e5956af order:3 compound_mapcount:0 compound_pincount:0
> flags: 0x1ffc00000010200(slab|head|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0)
> raw: 01ffc00000010200 0000000000000000 dead000000000001 f6ff000002c01600
> raw: fcff000005c37800 000000008010000d 00000001ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff000005c37600: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> ffff000005c37700: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> >ffff000005c37800: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> ^
> ffff000005c37900: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> ffff000005c37a00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> ==================================================================
> Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
> Mem abort info:
> ESR = 0x0000000086000005
> EC = 0x21: IABT (current EL), IL = 32 bits
> SET = 0, FnV = 0
> EA = 0, S1PTW = 0
> FSC = 0x05: level 1 translation fault
> user pgtable: 4k pages, 48-bit VAs, pgdp=000000004526f000
> [0000000000000000] pgd=0800000045ef2003, p4d=0800000045ef2003, pud=0000000000000000
> Internal error: Oops: 0000000086000005 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 0 PID: 2271 Comm: syz-executor.1 Tainted: G B 6.1.0-rc5-syzkaller-00320-gb6e7fdfd6f6a #0
> Hardware name: linux,dummy-virt (DT)
> pstate: 60400809 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=-c)
> pc : 0x0
> lr : call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474
> sp : ffff800008003e70
> x29: ffff800008003e70 x28: 0000000000000007 x27: 0000000000000080
> x26: fcff000002c5ee40 x25: ffff80000a2b60c0 x24: ffff80000a2b60c8
> x23: dead000000000122 x22: 0000000000000000 x21: 0000000000000100
> x20: fcff000002c5ee40 x19: 0000000000000000 x18: 0000000000000000
> x17: ffff800075918000 x16: ffff800008004000 x15: 0000000000004000
> x14: 00000000000000f7 x13: 0000000000000001 x12: ffff00007fbb7068
> x11: 0000000000000001 x10: 408a800000000a00 x9 : 000000000000006e
> x8 : 2000000000000000 x7 : 0000000000000001 x6 : ffff00007fbb7028
> x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff800008003f20
> x2 : 0000000000000000 x1 : 0000000000000000 x0 : f8ff000005c37850
> Call trace:
> 0x0
> expire_timers+0x98/0xc4 kernel/time/timer.c:1519
> __run_timers kernel/time/timer.c:1790 [inline]
> __run_timers kernel/time/timer.c:1763 [inline]
> run_timer_softirq+0xf4/0x254 kernel/time/timer.c:1803
> _stext+0x124/0x2a4
> ____do_softirq+0x10/0x20 arch/arm64/kernel/irq.c:79
> call_on_irq_stack+0x2c/0x5c arch/arm64/kernel/entry.S:889
> do_softirq_own_stack+0x1c/0x30 arch/arm64/kernel/irq.c:84
> invoke_softirq kernel/softirq.c:452 [inline]
> __irq_exit_rcu+0xcc/0xf4 kernel/softirq.c:650
> irq_exit_rcu+0x10/0x20 kernel/softirq.c:662
> el0_interrupt+0x54/0x104 arch/arm64/kernel/entry-common.c:717
> __el0_irq_handler_common+0x18/0x2c arch/arm64/kernel/entry-common.c:724
> el0t_64_irq_handler+0x10/0x20 arch/arm64/kernel/entry-common.c:729
> el0t_64_irq+0x198/0x19c arch/arm64/kernel/entry.S:582
> Code: bad PC value
> ---[ end trace 0000000000000000 ]---
>
>
> ---
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>
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Next message: Randy Dunlap: "[PATCH] irqreturn.h: fix kernel-doc warnings"
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