On Tue, Jun 13, 2017 at 4:27 AM, <idaif...@gmail.com> wrote: > Update: got another reproducible KASAN report on commit > 32c1431eea4881a6b17bd7c639315010aeefa452(4.12-rc5) :
Hi, If it's reproducible, please provide the reproducer. > ================================================================== > BUG: KASAN: use-after-free in cleanup_timers_list > kernel/time/posix-cpu-timers.c:401 [inline] > BUG: KASAN: use-after-free in cleanup_timers+0x35e/0x430 > kernel/time/posix-cpu-timers.c:415 > Read of size 8 at addr ffff88006c9229f0 by task syz-executor0/29927 > > CPU: 2 PID: 29927 Comm: syz-executor0 Not tainted 4.12.0-rc5 #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > Ubuntu-1.8.2-1ubuntu1 04/01/2014 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x83/0xbc lib/dump_stack.c:52 > print_address_description+0x73/0x290 mm/kasan/report.c:252 > kasan_report_error mm/kasan/report.c:351 [inline] > kasan_report+0x22b/0x340 mm/kasan/report.c:408 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 > cleanup_timers_list kernel/time/posix-cpu-timers.c:401 [inline] > cleanup_timers+0x35e/0x430 kernel/time/posix-cpu-timers.c:415 > posix_cpu_timers_exit+0x19/0x20 kernel/time/posix-cpu-timers.c:425 > __exit_signal kernel/exit.c:103 [inline] > release_task+0x1b7/0x12c0 kernel/exit.c:199 > exit_notify kernel/exit.c:748 [inline] > do_exit+0x15ba/0x2c60 kernel/exit.c:900 > do_group_exit+0xf6/0x340 kernel/exit.c:982 > get_signal+0x5c2/0x11b0 kernel/signal.c:2318 > do_signal+0x8d/0x19e0 arch/x86/kernel/signal.c:808 > exit_to_usermode_loop+0xe5/0x130 arch/x86/entry/common.c:157 > prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] > syscall_return_slowpath+0xd6/0x100 arch/x86/entry/common.c:263 > entry_SYSCALL_64_fastpath+0xa3/0xa5 > RIP: 0033:0x450439 > RSP: 002b:00007fd78ca08cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca > RAX: fffffffffffffe00 RBX: 0000000000718020 RCX: 0000000000450439 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000718020 > RBP: 0000000000718000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffe2264c6cf R14: 00007fd78ca099c0 R15: 0000000000000000 > > Allocated by task 29927: > save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 > save_stack+0x46/0xd0 mm/kasan/kasan.c:513 > set_track mm/kasan/kasan.c:525 [inline] > kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:617 > kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:555 > slab_post_alloc_hook mm/slab.h:456 [inline] > slab_alloc_node mm/slub.c:2718 [inline] > slab_alloc mm/slub.c:2726 [inline] > kmem_cache_alloc+0xb9/0x180 mm/slub.c:2731 > kmem_cache_zalloc include/linux/slab.h:655 [inline] > alloc_posix_timer kernel/time/posix-timers.c:551 [inline] > SYSC_timer_create kernel/time/posix-timers.c:618 [inline] > SyS_timer_create+0x167/0x1020 kernel/time/posix-timers.c:603 > entry_SYSCALL_64_fastpath+0x1a/0xa5 > > Freed by task 26611: > save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 > save_stack+0x46/0xd0 mm/kasan/kasan.c:513 > set_track mm/kasan/kasan.c:525 [inline] > kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:590 > slab_free_hook mm/slub.c:1357 [inline] > slab_free_freelist_hook mm/slub.c:1379 [inline] > slab_free mm/slub.c:2961 [inline] > kmem_cache_free+0x72/0x1a0 mm/slub.c:2983 > k_itimer_rcu_free+0x1d/0x20 kernel/time/posix-timers.c:566 > __rcu_reclaim kernel/rcu/rcu.h:195 [inline] > rcu_do_batch kernel/rcu/tree.c:2800 [inline] > invoke_rcu_callbacks kernel/rcu/tree.c:3057 [inline] > __rcu_process_callbacks kernel/rcu/tree.c:3024 [inline] > rcu_process_callbacks+0x3a4/0x1610 kernel/rcu/tree.c:3041 > __do_softirq+0x1be/0x59c kernel/softirq.c:284 > > The buggy address belongs to the object at ffff88006c922998 > which belongs to the cache posix_timers_cache of size 216 > The buggy address is located 88 bytes inside of > 216-byte region [ffff88006c922998, ffff88006c922a70) > The buggy address belongs to the page: > page:ffffea0001b24800 count:1 mapcount:0 mapping: (null) > index:0xffff88006c920af8 compound_mapcount: 0 > flags: 0x500000000008100(slab|head) > raw: 0500000000008100 0000000000000000 ffff88006c920af8 00000001001d0002 > raw: ffff88006c9f9850 ffff88006c9f9850 ffff88006d81aac0 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff88006c922880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff88006c922900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >>ffff88006c922980: fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff88006c922a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc > ffff88006c922a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > Disabling lock debugging due to kernel taint > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 2 PID: 29927 Comm: syz-executor0 Tainted: G B 4.12.0-rc5 > #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > Ubuntu-1.8.2-1ubuntu1 04/01/2014 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x83/0xbc lib/dump_stack.c:52 > panic+0x1af/0x388 kernel/panic.c:180 > kasan_end_report+0x50/0x50 mm/kasan/report.c:176 > kasan_report_error mm/kasan/report.c:356 [inline] > kasan_report+0x13b/0x340 mm/kasan/report.c:408 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 > cleanup_timers_list kernel/time/posix-cpu-timers.c:401 [inline] > cleanup_timers+0x35e/0x430 kernel/time/posix-cpu-timers.c:415 > posix_cpu_timers_exit+0x19/0x20 kernel/time/posix-cpu-timers.c:425 > __exit_signal kernel/exit.c:103 [inline] > release_task+0x1b7/0x12c0 kernel/exit.c:199 > exit_notify kernel/exit.c:748 [inline] > do_exit+0x15ba/0x2c60 kernel/exit.c:900 > do_group_exit+0xf6/0x340 kernel/exit.c:982 > get_signal+0x5c2/0x11b0 kernel/signal.c:2318 > do_signal+0x8d/0x19e0 arch/x86/kernel/signal.c:808 > exit_to_usermode_loop+0xe5/0x130 arch/x86/entry/common.c:157 > prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] > syscall_return_slowpath+0xd6/0x100 arch/x86/entry/common.c:263 > entry_SYSCALL_64_fastpath+0xa3/0xa5 > RIP: 0033:0x450439 > RSP: 002b:00007fd78ca08cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca > RAX: fffffffffffffe00 RBX: 0000000000718020 RCX: 0000000000450439 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000718020 > RBP: 0000000000718000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffe2264c6cf R14: 00007fd78ca099c0 R15: 0000000000000000 > Shutting down cpus with NMI > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > 在 2017年6月8日星期四 UTC+8下午5:30:27，idaifish写道： >> >> Hi: >> >> I've got the following error report while fuzzing the kernel with >> syzkaller on 4.12.0-rc3. >> >> PoC and config are attached. >> >> >> ------------------------------------------------------------------------------------------------------------------ >> >> kasan: GPF could be caused by NULL-ptr deref or user memory access >> general protection fault: 0000 [#1] SMP KASAN >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Modules linked in: >> CPU: 2 PID: 11989 Comm: syz-executor0 Not tainted 4.12.0-rc3 #1 >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS >> Ubuntu-1.8.2-1ubuntu1 04/01/2014 >> task: ffff88006d4f2980 task.stack: ffff88006acb0000 >> RIP: 0010:__list_del include/linux/list.h:104 [inline] >> RIP: 0010:__list_del_entry include/linux/list.h:119 [inline] >> RIP: 0010:list_del_init include/linux/list.h:158 [inline] >> RIP: 0010:cleanup_timers_list kernel/time/posix-cpu-timers.c:402 [inline] >> RIP: 0010:cleanup_timers+0x299/0x430 kernel/time/posix-cpu-timers.c:415 >> RSP: 0018:ffff88006acb7988 EFLAGS: 00010002 >> RAX: ffff88006d4f2980 RBX: ffff88006bff3940 RCX: 0000000000000001 >> RDX: ffffffff81266ad0 RSI: 0000000000000000 RDI: 0000000000000008 >> RBP: ffff88006acb79c8 R08: 0000000000000000 R09: 0000000000000002 >> R10: 00000000f17eaa6c R11: 000000006ec117ba R12: 0000000000000000 >> R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88006bff3940 >> FS: 0000000000000000(0000) GS:ffff88006e400000(0000) >> knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00000000204f5000 CR3: 000000000380e000 CR4: 00000000000006e0 >> DR0: 0000000000000042 DR1: 0000000000008000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 >> Call Trace: >> posix_cpu_timers_exit+0x19/0x20 kernel/time/posix-cpu-timers.c:425 >> __exit_signal kernel/exit.c:103 [inline] >> release_task+0x1b7/0x12c0 kernel/exit.c:199 >> exit_notify kernel/exit.c:748 [inline] >> do_exit+0x15ba/0x2c60 kernel/exit.c:900 >> do_group_exit+0xf6/0x340 kernel/exit.c:982 >> get_signal+0x5c2/0x11b0 kernel/signal.c:2318 >> do_signal+0x8d/0x19e0 arch/x86/kernel/signal.c:808 >> exit_to_usermode_loop+0xe5/0x130 arch/x86/entry/common.c:157 >> prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] >> syscall_return_slowpath+0xd6/0x100 arch/x86/entry/common.c:263 >> entry_SYSCALL_64_fastpath+0xa3/0xa5 >> RIP: 0033:0x450439 >> RSP: 002b:00007fce47004cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca >> RAX: fffffffffffffe00 RBX: 0000000000718020 RCX: 0000000000450439 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000718020 >> RBP: 0000000000718000 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >> R13: 00007fff1a12cddf R14: 00007fce470059c0 R15: 0000000000000000 >> Code: 00 e8 9c a0 09 00 48 8d 7b 08 48 89 fa 48 c1 ea 03 42 80 3c 2a 00 0f >> 85 c2 00 00 00 49 8d 7e 08 48 8b 53 08 48 89 f9 48 c1 e9 03 <42> 80 3c 29 00 >> 0f 85 96 00 00 00 48 89 d1 49 89 56 08 48 c1 e9 >> RIP: __list_del include/linux/list.h:104 [inline] RSP: ffff88006acb7988 >> RIP: __list_del_entry include/linux/list.h:119 [inline] RSP: >> ffff88006acb7988 >> RIP: list_del_init include/linux/list.h:158 [inline] RSP: ffff88006acb7988 >> RIP: cleanup_timers_list kernel/time/posix-cpu-timers.c:402 [inline] RSP: >> ffff88006acb7988 >> RIP: cleanup_timers+0x299/0x430 kernel/time/posix-cpu-timers.c:415 RSP: >> ffff88006acb7988 >> ---[ end trace ac8e042e922b484f ]--- >> Kernel panic - not syncing: Fatal exception >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Kernel Offset: disabled >> Rebooting in 86400 seconds.. >> >> >> ----------- >> Regards, >> idaifish > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout.
