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* KASAN: use-after-free Read in tcp_write_timer_handler
@ 2023-04-05 10:41 Dae R. Jeong
  2023-04-05 11:28 ` Eric Dumazet
  0 siblings, 1 reply; 7+ messages in thread
From: Dae R. Jeong @ 2023-04-05 10:41 UTC (permalink / raw)
  To: edumazet, davem, yoshfuji, dsahern, kuba, pabeni, netdev,
	linux-kernel, bpf

Hi,

We observed an issue "KASAN: use-after-free Read in tcp_write_timer_handler" during fuzzing.

Unfortunately, we have not found a reproducer for the crash yet. We
will inform you if we have any update on this crash.  Detailed crash
information is attached below.

Best regards,
Dae R. Jeong

-----
- Kernel version:
6.0-rc7

- Crash report:
==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x921/0xa60 net/ipv4/tcp_timer.c:624
Read of size 1 at addr ffff888046bc86a5 by task syz-fuzzer/6625

CPU: 0 PID: 6625 Comm: syz-fuzzer Not tainted 6.0.0-rc7-00167-g92162e4a9862 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1cf/0x2b7 lib/dump_stack.c:106
 print_address_description+0x21/0x470 mm/kasan/report.c:317
 print_report+0x108/0x1f0 mm/kasan/report.c:433
 kasan_report+0xe5/0x110 mm/kasan/report.c:495
 tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
 tcp_write_timer_handler+0x921/0xa60 net/ipv4/tcp_timer.c:624
 tcp_write_timer+0x1a5/0x2c0 net/ipv4/tcp_timer.c:637
 call_timer_fn+0xf6/0x220 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers+0x76f/0x980 kernel/time/timer.c:1790
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803
 __do_softirq+0x372/0x783 kernel/softirq.c:571
 __irq_exit_rcu+0xcf/0x160 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0033:0x421fb1
Code: 90 48 8b 4f 18 90 49 b8 00 00 00 00 00 80 00 00 49 01 c8 49 c1 e8 1a 66 90 49 81 f8 00 00 40 00 0f 83 e2 00 00 00 4a 8b 14 c2 <84> 02 49 89 c8 48 c1 e9 10 81 e1 ff 03 00 00 44 0f b6 8c 0a 00 04
RSP: 002b:00007f3d50bebd38 EFLAGS: 00000287
RAX: 000000c001a0d140 RBX: 000000c001bba000 RCX: 000000c001a0c000
RDX: 00007f3d51bef000 RSI: 000000c000025240 RDI: 00007f3d791daa28
RBP: 00007f3d50bebd78 R08: 0000000000203000 R09: 00007f3d4c2f6001
R10: 000000000000008a R11: 0000000000004048 R12: 0000000000000004
R13: 000000c001a0d140 R14: 000000c000007520 R15: 0000000000000180
 </TASK>

Allocated by task 6664:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0xa3/0xd0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3248 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc+0x2e6/0x450 mm/slub.c:3273
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 net_alloc net/core/net_namespace.c:404 [inline]
 copy_net_ns+0x193/0x6d0 net/core/net_namespace.c:459
 create_new_namespaces+0x4db/0xa40 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226
 ksys_unshare+0x5a9/0xbc0 kernel/fork.c:3183
 __do_sys_unshare kernel/fork.c:3254 [inline]
 __se_sys_unshare kernel/fork.c:3252 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3252
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4e/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 6874:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x3d/0x60 mm/kasan/common.c:45
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x134/0x1c0 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1759 [inline]
 slab_free_freelist_hook+0x278/0x370 mm/slub.c:1785
 slab_free mm/slub.c:3539 [inline]
 kmem_cache_free+0x11a/0x310 mm/slub.c:3556
 net_free net/core/net_namespace.c:433 [inline]
 cleanup_net+0xd68/0xe20 net/core/net_namespace.c:616
 process_one_work+0x83f/0x11a0 kernel/workqueue.c:2289
 worker_thread+0xa6c/0x1290 kernel/workqueue.c:2436
 kthread+0x28a/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Last potentially related work creation:
 kasan_save_stack+0x2b/0x50 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:348
 insert_work+0x54/0x400 kernel/workqueue.c:1358
 __queue_work+0xa95/0xe00 kernel/workqueue.c:1517
 call_timer_fn+0xf6/0x220 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers+0x7a2/0x980 kernel/time/timer.c:1790
 __do_softirq+0x372/0x783 kernel/softirq.c:571

Second to last potentially related work creation:
 kasan_save_stack+0x2b/0x50 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:348
 insert_work+0x54/0x400 kernel/workqueue.c:1358
 __queue_work+0xa95/0xe00 kernel/workqueue.c:1517
 call_timer_fn+0xf6/0x220 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers+0x7a2/0x980 kernel/time/timer.c:1790
 __do_softirq+0x372/0x783 kernel/softirq.c:571

The buggy address belongs to the object at ffff888046bc8000
 which belongs to the cache net_namespace of size 6784
The buggy address is located 1701 bytes inside of
 6784-byte region [ffff888046bc8000, ffff888046bc9a80)

The buggy address belongs to the physical page:
page:ffffea00011af200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x46bc8
head:ffffea00011af200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888013618f00
raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6664, tgid 6664 (syz-executor.0), ts 88505587135, free_ts 0
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x800/0xc10 mm/page_alloc.c:4283
 __alloc_pages+0x2f0/0x650 mm/page_alloc.c:5549
 alloc_slab_page mm/slub.c:1829 [inline]
 allocate_slab+0x1eb/0xc00 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x581/0xff0 mm/slub.c:3036
 __slab_alloc mm/slub.c:3123 [inline]
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc+0x386/0x450 mm/slub.c:3273
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 net_alloc net/core/net_namespace.c:404 [inline]
 copy_net_ns+0x193/0x6d0 net/core/net_namespace.c:459
 create_new_namespaces+0x4db/0xa40 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226
 ksys_unshare+0x5a9/0xbc0 kernel/fork.c:3183
 __do_sys_unshare kernel/fork.c:3254 [inline]
 __se_sys_unshare kernel/fork.c:3252 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3252
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4e/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888046bc8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888046bc8600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888046bc8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888046bc8700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888046bc8780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

^ permalink raw reply	[flat|nested] 7+ messages in thread
* KASAN: use-after-free Read in tcp_write_timer_handler
@ 2021-09-22  1:43 Hao Sun
  2021-09-22  1:56 ` Eric Dumazet
  0 siblings, 1 reply; 7+ messages in thread
From: Hao Sun @ 2021-09-22  1:43 UTC (permalink / raw)
  To: davem, dsahern, Eric Dumazet, kuba, netdev, yoshfuji
  Cc: andrii, ast, bpf, daniel, john.fastabend, kafai,
	Linux Kernel Mailing List, songliubraving, yhs

Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 4357f03d6611 Merge tag 'pm-5.15-rc2
git tree: upstream
console output:
https://drive.google.com/file/d/1TvIf-dvfzbm8RKtYz9QHfPWixHnjIcFW/view?usp=sharing
kernel config: https://drive.google.com/file/d/1HKZtF_s3l6PL3OoQbNq_ei9CdBus-Tz0/view?usp=sharing
Similar report:
https://syzkaller.appspot.com/bug?id=83d75b561d8b1b2529c635338ecfb7136261db11

Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@gmail.com>

==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:383 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x8fd/0x940
net/ipv4/tcp_timer.c:626
Read of size 1 at addr ffff88802272a0d5 by task syz-executor/12060

CPU: 2 PID: 12060 Comm: syz-executor Not tainted 5.15.0-rc1+ #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x93/0x334 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 tcp_probe_timer net/ipv4/tcp_timer.c:383 [inline]
 tcp_write_timer_handler+0x8fd/0x940 net/ipv4/tcp_timer.c:626
 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x6b0/0xa90 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb6/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x1d7/0x93b kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu kernel/softirq.c:636 [inline]
 irq_exit_rcu+0xf2/0x130 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:zap_pte_range mm/memory.c:1335 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1481 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1510 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1531 [inline]
RIP: 0010:unmap_page_range+0xbdd/0x2da0 mm/memory.c:1552
Code: 00 00 00 48 89 44 24 08 e9 8a f5 ff ff e8 4b 97 ca ff 48 8b 74
24 08 4c 89 ea 48 8b 7c 24 48 e8 69 ec ff ff 48 83 7c 24 38 00 <49> 89
c7 0f 85 02 15 00 00 e8 25 97 ca ff 48 8b 44 24 10 48 8d 68
RSP: 0018:ffffc900092cf7a0 EFLAGS: 00000246
RAX: ffffea000080c780 RBX: 0000000000000025 RCX: ffff888104079c80
RDX: 0000000000000000 RSI: ffff888104079c80 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffffffff81aba2c6 R09: 000000000013ffff
R10: 0000000000000006 R11: ffffed102080f390 R12: 0000000000000025
R13: 000000002031e025 R14: dffffc0000000000 R15: 00000000004db000
 unmap_single_vma+0x198/0x310 mm/memory.c:1597
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629
 exit_mmap+0x1d0/0x650 mm/mmap.c:3171
 __mmput kernel/fork.c:1115 [inline]
 mmput+0x16d/0x440 kernel/fork.c:1136
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xad6/0x2dd0 kernel/exit.c:812
 do_group_exit+0x125/0x340 kernel/exit.c:922
 get_signal+0x4d5/0x25a0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x2ed/0x1c40 arch/x86/kernel/signal.c:865
 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+0x192/0x2a0 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4739cd
Code: Unable to access opcode bytes at RIP 0x4739a3.
RSP: 002b:00007f4ef3c1bcd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000059c0a0 RCX: 00000000004739cd
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000059c0a8
RBP: 000000000059c0a8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000059c0ac
R13: 00007ffc59e0995f R14: 00007ffc59e09b00 R15: 00007f4ef3c1bdc0

Allocated by task 10273:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x83/0xb0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4d/0x4b0 mm/slab.h:519
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x150/0x340 mm/slub.c:3219
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 net_alloc net/core/net_namespace.c:402 [inline]
 copy_net_ns+0xea/0x660 net/core/net_namespace.c:457
 create_new_namespaces.isra.0+0x3cb/0xae0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc8/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3077
 __do_sys_unshare kernel/fork.c:3151 [inline]
 __se_sys_unshare kernel/fork.c:3149 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3149
 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

The buggy address belongs to the object at ffff888022729a40
 which belongs to the cache net_namespace of size 6464
The buggy address is located 1685 bytes inside of
 6464-byte region [ffff888022729a40, ffff88802272b380)
The buggy address belongs to the page:
page:ffffea000089ca00 refcount:1 mapcount:0 mapping:0000000000000000
index:0xffff888022729a40 pfn:0x22728
head:ffffea000089ca00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888010e0c500
raw: ffff888022729a40 0000000080040002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask
0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC),
pid 9342, ts 177339275214, free_ts 174923780601
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2418 [inline]
 prep_new_page+0x1a5/0x240 mm/page_alloc.c:2424
 get_page_from_freelist+0x1f10/0x3b70 mm/page_alloc.c:4153
 __alloc_pages+0x306/0x6e0 mm/page_alloc.c:5375
 alloc_pages+0x115/0x240 mm/mempolicy.c:2197
 alloc_slab_page mm/slub.c:1763 [inline]
 allocate_slab mm/slub.c:1900 [inline]
 new_slab+0x34a/0x480 mm/slub.c:1963
 ___slab_alloc+0xa9f/0x10d0 mm/slub.c:2994
 __slab_alloc.isra.0+0x4d/0xa0 mm/slub.c:3081
 slab_alloc_node mm/slub.c:3172 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x31e/0x340 mm/slub.c:3219
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 net_alloc net/core/net_namespace.c:402 [inline]
 copy_net_ns+0xea/0x660 net/core/net_namespace.c:457
 create_new_namespaces.isra.0+0x3cb/0xae0 kernel/nsproxy.c:110
 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178
 copy_process+0x2d37/0x73d0 kernel/fork.c:2197
 kernel_clone+0xe7/0x10d0 kernel/fork.c:2584
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2701
 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:1338 [inline]
 free_pcp_prepare+0x412/0x900 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x19/0x580 mm/page_alloc.c:3394
 __unfreeze_partials+0x340/0x360 mm/slub.c:2495
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x13d/0x180 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4d/0x4b0 mm/slab.h:519
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x150/0x340 mm/slub.c:3219
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1603 [inline]
 new_handle fs/jbd2/transaction.c:481 [inline]
 jbd2__journal_start fs/jbd2/transaction.c:508 [inline]
 jbd2__journal_start+0x191/0x920 fs/jbd2/transaction.c:490
 __ext4_journal_start_sb+0x3a8/0x4a0 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_da_write_begin+0x4c5/0x1180 fs/ext4/inode.c:3002
 generic_perform_write+0x1fe/0x510 mm/filemap.c:3770
 ext4_buffered_write_iter+0x206/0x4c0 fs/ext4/file.c:269
 ext4_file_write_iter+0x42e/0x14a0 fs/ext4/file.c:680
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x47b/0x750 fs/read_write.c:729
 do_iter_write fs/read_write.c:855 [inline]
 do_iter_write+0x18b/0x700 fs/read_write.c:836

Memory state around the buggy address:
 ffff888022729f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802272a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802272a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff88802272a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802272a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0: 00 00                add    %al,(%rax)
   2: 00 48 89              add    %cl,-0x77(%rax)
   5: 44 24 08              rex.R and $0x8,%al
   8: e9 8a f5 ff ff        jmpq   0xfffff597
   d: e8 4b 97 ca ff        callq  0xffca975d
  12: 48 8b 74 24 08        mov    0x8(%rsp),%rsi
  17: 4c 89 ea              mov    %r13,%rdx
  1a: 48 8b 7c 24 48        mov    0x48(%rsp),%rdi
  1f: e8 69 ec ff ff        callq  0xffffec8d
  24: 48 83 7c 24 38 00    cmpq   $0x0,0x38(%rsp)
* 2a: 49 89 c7              mov    %rax,%r15 <-- trapping instruction
  2d: 0f 85 02 15 00 00    jne    0x1535
  33: e8 25 97 ca ff        callq  0xffca975d
  38: 48 8b 44 24 10        mov    0x10(%rsp),%rax
  3d: 48                    rex.W
  3e: 8d                    .byte 0x8d
  3f: 68                    .byte 0x68

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-04-05 22:17 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-04-05 10:41 KASAN: use-after-free Read in tcp_write_timer_handler Dae R. Jeong
2023-04-05 11:28 ` Eric Dumazet
2023-04-05 19:41   ` Kuniyuki Iwashima
2023-04-05 19:47     ` Eric Dumazet
2023-04-05 22:17       ` Dae R. Jeong
  -- strict thread matches above, loose matches on Subject: below --
2021-09-22  1:43 Hao Sun
2021-09-22  1:56 ` Eric Dumazet

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