rcu: Kernel stack is corrupted in: perf_trace_rcu_dyntick

王晓东
2018-09-29T09:22:30Z

Hi there,

We would like to report a kernel stack corrupted problem we identified
in the perf_trace_rcu_dyntick function of tracing events subsystem.
And the problem was founded by syzkaller. We has tested the PoC on
the lasted master branch of kernel(4.19.0-rc5+).

The crash log generated with KASAN enabled:

root@pc:~# ./perf_trace_rcu_dyntick
[ 582.069938] Kernel panic - not syncing: stack-protector: Kernel
stack is corrupted in: perf_trace_rcu_dyntick+0x355/0x4f0
[ 582.069938]
[ 582.071341] CPU: 6 PID: 3417 Comm: perf_trace_rcu_ Not tainted 4.19.0-rc5+ #1
[ 582.072134] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 582.073103] Call Trace:
[ 582.073364] <IRQ>
[ 582.073614] dump_stack+0x8c/0xce
[ 582.074039] panic+0x1cb/0x3aa
[ 582.074427] ? refcount_error_report+0x296/0x296
[ 582.075003] ? timerqueue_del+0x71/0x130
[ 582.075553] ? perf_trace_rcu_dyntick+0x355/0x4f0
[ 582.076063] ? __stack_chk_fail+0x6/0x20
[ 582.076763] ? perf_trace_rcu_dyntick+0x355/0x4f0
[ 582.077369] __stack_chk_fail+0x1f/0x20
[ 582.077877] perf_trace_rcu_dyntick+0x355/0x4f0
[ 582.078442] ? rcu_gp_is_expedited+0xa0/0xa0
[ 582.078993] ? rcu_gp_is_expedited+0xa0/0xa0
[ 582.079525] ? check_preempt_curr+0x1c2/0x2a0
[ 582.080059] ? sched_clock_cpu+0x18/0x160
[ 582.080551] rcu_nmi_enter+0x1f0/0x2f0
[ 582.081036] ? rcu_gp_is_expedited+0xa0/0xa0
[ 582.081507] irq_enter+0xf/0x80
[ 582.081914] smp_apic_timer_interrupt+0x1b/0x2d0
[ 582.082480] apic_timer_interrupt+0xf/0x20
[ 582.082984] </IRQ>
[ 582.083219] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
[ 582.087816] Code: e8 35 0b 20 00 48 8b 14 24 e9 fe fe ff ff 48 89
df e8 24 0b 20 00 e9 d9 fe ff ff 4c 89 e7 e8 17 0b 20 00 e9 ab fe ff
ff 90 90 <65> 48 8b 04 25 40 dd 01 00 65 8b 15 70 03 8f 63 81 e2 00 01
1f 00
[ 582.090289] RSP: 0018:ffff8800651bf9e0 EFLAGS: 00000206 ORIG_RAX:
ffffffffffffff13
[ 582.091238] RAX: 0000000000000000 RBX: ffffffff9eed12a5 RCX: ffffffff9c6ca1b6
[ 582.092873] RDX: 0000000000000005 RSI: ffffffff9ee31d71 RDI: ffffffff9eed12a4
[ 582.093934] RBP: 0000000000000078 R08: ffffed000d38dfb2 R09: ffffed000d38dfb1
[ 582.095102] R10: 000000007350a3ba R11: ffff880069c6fd8f R12: ffff8800651bfa6e
[ 582.096444] R13: 0000000000000001 R14: dffffc0000000000 R15: 000000000000006a
[ 582.097414] ? kallsyms_expand_symbol.constprop.11+0x176/0x250
[ 582.098518] kallsyms_expand_symbol.constprop.11+0x12e/0x250
[ 582.099707] kallsyms_lookup_name+0xbe/0x1d0
[ 582.100369] ? kallsyms_on_each_symbol+0x210/0x210
[ 582.101436] ? snprintf+0xbd/0xf0
[ 582.102029] ? vsprintf+0x30/0x30
[ 582.102805] ? kasan_kmalloc+0xa9/0xd0
[ 582.103489] ? alloc_trace_kprobe+0x6c0/0x930
[ 582.104073] kprobe_on_func_entry+0x57/0xb0
[ 582.105421] register_kretprobe+0x89/0xc10
[ 582.105930] ? set_print_fmt+0x32/0xa0
[ 582.106376] __register_trace_kprobe.part.10+0x14e/0x2e0
[ 582.106980] create_local_trace_kprobe+0x29c/0x3f0
[ 582.107487] perf_kprobe_init+0x15f/0x210
[ 582.107912] perf_kprobe_event_init+0xc4/0x140
[ 582.108377] perf_try_init_event+0xcb/0x290
[ 582.108817] perf_event_alloc+0x1476/0x2020
[ 582.109264] ? find_get_context.isra.106+0x690/0x690
[ 582.109922] ? __alloc_fd+0x1a3/0x4e0
[ 582.120002] __do_sys_perf_event_open+0x222/0x1f40
[ 582.123049] ? avc_has_perm_noaudit+0x340/0x340
[ 582.131226] ? perf_event_set_output+0x5f0/0x5f0
[ 582.134395] ? handle_mm_fault+0x103/0x350
[ 582.138102] ? ksys_ioctl+0x61/0x90
[ 582.140234] do_syscall_64+0x9a/0x2c0
[ 582.142674] ? prepare_exit_to_usermode+0xbc/0x150
[ 582.146856] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 582.151127] RIP: 0033:0x446159
[ 582.152816] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00
00 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 5b 08 fc ff c3 66 2e 0f 1f 84 00 00
00 00
[ 582.167257] RSP: 002b:00007fffc2b023d8 EFLAGS: 00000246 ORIG_RAX:
000000000000012a
[ 582.171375] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000446159
[ 582.175760] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000180
[ 582.176487] RBP: 00007fffc2b025b0 R08: 0000000000000000 R09: 0000000000000000
[ 582.177189] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000406e40
[ 582.177898] R13: 0000000000406ed0 R14: 0000000000000000 R15: 0000000000000000
[ 583.353322] Shutting down cpus with NMI
[ 583.354285] Kernel Offset: 0x1b400000 from 0xffffffff81000000
(relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 583.356743] Rebooting in 86400 seconds..

This bug could be easily reproduced by running the PoC(generated by
syzkaller, and transformed to C Source code).

For any further information, please feel free to contact us at
wisedd@gmail.com. We would be more than happy to provide other
information of this problem.