KASAN: use-after-free Read in selinux_netlbl_sk_security

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in selinux_netlbl_sk_security_free selinux				1	2752d	2724d	0/28	closed as invalid on 2017/11/03 21:23
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29189
dccp_close: ABORT with 1 bytes unread
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BUG: KASAN: use-after-free in netlbl_secattr_destroy include/net/netlabel.h:377 [inline]
BUG: KASAN: use-after-free in netlbl_secattr_free include/net/netlabel.h:409 [inline]
BUG: KASAN: use-after-free in selinux_netlbl_sk_security_free+0x28b/0x2f0 security/selinux/netlabel.c:171
Read of size 4 at addr ffff8801cbaa2780 by task swapper/1/0

CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc1+ #205
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 netlbl_secattr_destroy include/net/netlabel.h:377 [inline]
 netlbl_secattr_free include/net/netlabel.h:409 [inline]
 selinux_netlbl_sk_security_free+0x28b/0x2f0 security/selinux/netlabel.c:171
 selinux_sk_free_security+0x47/0x60 security/selinux/hooks.c:4907
 security_sk_free+0x48/0x80 security/security.c:1431
 sk_prot_free net/core/sock.c:1502 [inline]
 __sk_destruct+0x609/0x910 net/core/sock.c:1585
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2758 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
 rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2996
 __do_softirq+0x29d/0xbb2 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:540 [inline]
 smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:795
 </IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffff8801da38fda8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff11
RAX: dffffc0000000000 RBX: 1ffff1003b471fb8 RCX: 0000000000000000
RDX: 1ffffffff0bd968c RSI: 0000000000000001 RDI: ffffffff85ecb460
RBP: ffff8801da38fda8 R08: ffffffff8163b0f0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801da38fe60 R14: ffffffff865ea860 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
 default_idle+0xbf/0x460 arch/x86/kernel/process.c:348
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:339
 default_idle_call+0x36/0x90 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
 start_secondary+0x2dd/0x3e0 arch/x86/kernel/smpboot.c:277
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237

Allocated by task 29487:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3613
 kmalloc include/linux/slab.h:499 [inline]
 allocate_probes kernel/tracepoint.c:65 [inline]
 func_add kernel/tracepoint.c:120 [inline]
 tracepoint_add_func kernel/tracepoint.c:208 [inline]
 tracepoint_probe_register_prio+0x6f9/0x9a0 kernel/tracepoint.c:283
 tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:304
 trace_event_reg+0x167/0x320 kernel/trace/trace_events.c:305
 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
 perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
 perf_trace_init+0x4ef/0xab0 kernel/trace/trace_event_perf.c:221
 perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:7953
 perf_try_init_event+0xc9/0x1f0 kernel/events/core.c:9179
 perf_init_event kernel/events/core.c:9217 [inline]
 perf_event_alloc+0x1cc6/0x2b00 kernel/events/core.c:9481
 SYSC_perf_event_open+0x842/0x2f10 kernel/events/core.c:9936
 SyS_perf_event_open+0x39/0x50 kernel/events/core.c:9822
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 29502:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3491 [inline]
 kfree+0xca/0x250 mm/slab.c:3806
 rcu_free_old_probes+0x15/0x20 kernel/tracepoint.c:72
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2758 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
 rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2996
 __do_softirq+0x29d/0xbb2 kernel/softirq.c:285

The buggy address belongs to the object at ffff8801cbaa2780
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff8801cbaa2780, ffff8801cbaa27c0)
The buggy address belongs to the page:
page:000000005cd87cdd count:1 mapcount:0 mapping:00000000ca9f4b66 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801cbaa2000 0000000000000000 0000000100000020
raw: ffffea0007144820 ffffea0006560ea0 ffff8801db000340 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cbaa2680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801cbaa2700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8801cbaa2780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff8801cbaa2800: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801cbaa2880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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