* Re: KASAN: use-after-free Read in nr_rx_frame (2)
[not found] <000000000000e42667058e554371@google.com>
@ 2019-07-23 8:53 ` Dmitry Vyukov
2019-07-31 7:30 ` syzbot
2019-07-31 21:32 ` syzbot
2 siblings, 0 replies; 3+ messages in thread
From: Dmitry Vyukov @ 2019-07-23 8:53 UTC (permalink / raw)
To: Ralf Baechle, David Miller, linux-hams, netdev, Cong Wang
Cc: LKML, syzkaller-bugs, syzbot
On Tue, Jul 23, 2019 at 10:49 AM syzbot
<syzbot+701728447042217b67c1@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 3bfe1fc4 Merge tag 'for-5.3/dm-changes-2' of git://git.ker..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10413e34600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=21511d77e11db3cb
> dashboard link: https://syzkaller.appspot.com/bug?extid=701728447042217b67c1
> compiler: clang version 9.0.0 (/home/glider/llvm/clang
> 80fee25776c2fb61e74c1ecb1a523375c2500b69)
>
> Unfortunately, I don't have any reproducer for this crash yet.
+net/netrom/af_netrom.c maintainers
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+701728447042217b67c1@syzkaller.appspotmail.com
>
> ==================================================================
> BUG: KASAN: use-after-free in atomic_read
> /./include/asm-generic/atomic-instrumented.h:26 [inline]
> BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x7c/0x280
> /lib/refcount.c:123
> Read of size 4 at addr ffff88808ee52080 by task swapper/1/0
>
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.2.0+ #35
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> <IRQ>
> __dump_stack /lib/dump_stack.c:77 [inline]
> dump_stack+0x1d8/0x2f8 /lib/dump_stack.c:113
> print_address_description+0x75/0x5b0 /mm/kasan/report.c:351
> __kasan_report+0x14b/0x1c0 /mm/kasan/report.c:482
> kasan_report+0x26/0x50 /mm/kasan/common.c:612
> check_memory_region_inline /mm/kasan/generic.c:182 [inline]
> check_memory_region+0x2cf/0x2e0 /mm/kasan/generic.c:192
> __kasan_check_read+0x11/0x20 /mm/kasan/common.c:92
> atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline]
> refcount_inc_not_zero_checked+0x7c/0x280 /lib/refcount.c:123
> refcount_inc_checked+0x15/0x50 /lib/refcount.c:156
> sock_hold /./include/net/sock.h:649 [inline]
> sk_add_node /./include/net/sock.h:701 [inline]
> nr_insert_socket /net/netrom/af_netrom.c:137 [inline]
> nr_rx_frame+0x17bc/0x1e40 /net/netrom/af_netrom.c:1023
> nr_loopback_timer+0x6a/0x140 /net/netrom/nr_loopback.c:59
> call_timer_fn+0xec/0x200 /kernel/time/timer.c:1322
> expire_timers /kernel/time/timer.c:1366 [inline]
> __run_timers+0x7cd/0x9c0 /kernel/time/timer.c:1685
> run_timer_softirq+0x4a/0x90 /kernel/time/timer.c:1698
> __do_softirq+0x333/0x7c4 /./arch/x86/include/asm/paravirt.h:777
> invoke_softirq /kernel/softirq.c:373 [inline]
> irq_exit+0x227/0x230 /kernel/softirq.c:413
> exiting_irq /./arch/x86/include/asm/apic.h:537 [inline]
> smp_apic_timer_interrupt+0x113/0x280 /arch/x86/kernel/apic/apic.c:1095
> apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828
> </IRQ>
> RIP: 0010:native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:61
> Code: 06 fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 c4 41 06
> fa eb b0 90 90 e9 07 00 00 00 0f 00 2d 76 67 56 00 fb f4 <c3> 90 e9 07 00
> 00 00 0f 00 2d 66 67 56 00 f4 c3 90 90 55 48 89 e5
> RSP: 0018:ffff8880a98cfd38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
> RAX: 1ffffffff11950db RBX: ffff8880a98bc340 RCX: dffffc0000000000
> RDX: 0000000000000000 RSI: ffffffff812d193a RDI: ffff8880a98bcb78
> RBP: ffff8880a98cfd40 R08: ffff8880a98bcb90 R09: ffffed1015317869
> R10: ffffed1015317869 R11: 0000000000000000 R12: 0000000000000001
> R13: 1ffff11015317868 R14: dffffc0000000000 R15: dffffc0000000000
> arch_cpu_idle+0xa/0x10 /arch/x86/kernel/process.c:571
> default_idle_call+0x59/0xa0 /kernel/sched/idle.c:94
> cpuidle_idle_call /kernel/sched/idle.c:154 [inline]
> do_idle+0x180/0x780 /kernel/sched/idle.c:263
> cpu_startup_entry+0x25/0x30 /kernel/sched/idle.c:354
> start_secondary+0x3f4/0x490 /arch/x86/kernel/smpboot.c:264
> secondary_startup_64+0xa4/0xb0 /arch/x86/kernel/head_64.S:243
>
> Allocated by task 0:
> save_stack /mm/kasan/common.c:69 [inline]
> set_track /mm/kasan/common.c:77 [inline]
> __kasan_kmalloc+0x11c/0x1b0 /mm/kasan/common.c:487
> kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501
> __do_kmalloc /mm/slab.c:3655 [inline]
> __kmalloc+0x254/0x340 /mm/slab.c:3664
> kmalloc /./include/linux/slab.h:557 [inline]
> sk_prot_alloc+0xb0/0x290 /net/core/sock.c:1603
> sk_alloc+0x38/0x950 /net/core/sock.c:1657
> nr_make_new /net/netrom/af_netrom.c:476 [inline]
> nr_rx_frame+0xabc/0x1e40 /net/netrom/af_netrom.c:959
> nr_loopback_timer+0x6a/0x140 /net/netrom/nr_loopback.c:59
> call_timer_fn+0xec/0x200 /kernel/time/timer.c:1322
> expire_timers /kernel/time/timer.c:1366 [inline]
> __run_timers+0x7cd/0x9c0 /kernel/time/timer.c:1685
> run_timer_softirq+0x4a/0x90 /kernel/time/timer.c:1698
> __do_softirq+0x333/0x7c4 /./arch/x86/include/asm/paravirt.h:777
>
> Freed by task 4044:
> save_stack /mm/kasan/common.c:69 [inline]
> set_track /mm/kasan/common.c:77 [inline]
> __kasan_slab_free+0x12a/0x1e0 /mm/kasan/common.c:449
> kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457
> __cache_free /mm/slab.c:3425 [inline]
> kfree+0x115/0x200 /mm/slab.c:3756
> sk_prot_free /net/core/sock.c:1640 [inline]
> __sk_destruct+0x567/0x660 /net/core/sock.c:1726
> sk_destruct /net/core/sock.c:1734 [inline]
> __sk_free+0x317/0x3e0 /net/core/sock.c:1745
> sk_free /net/core/sock.c:1756 [inline]
> sock_put /./include/net/sock.h:1725 [inline]
> sock_efree+0x60/0x80 /net/core/sock.c:2042
> skb_release_head_state+0x100/0x220 /net/core/skbuff.c:652
> skb_release_all /net/core/skbuff.c:663 [inline]
> __kfree_skb+0x25/0x170 /net/core/skbuff.c:679
> kfree_skb+0x6f/0xb0 /net/core/skbuff.c:697
> nr_accept+0x4ef/0x650 /net/netrom/af_netrom.c:819
> __sys_accept4+0x5bc/0x9a0 /net/socket.c:1750
> __do_sys_accept /net/socket.c:1791 [inline]
> __se_sys_accept /net/socket.c:1788 [inline]
> __x64_sys_accept+0x7d/0x90 /net/socket.c:1788
> do_syscall_64+0xfe/0x140 /arch/x86/entry/common.c:296
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> The buggy address belongs to the object at ffff88808ee52000
> which belongs to the cache kmalloc-2k of size 2048
> The buggy address is located 128 bytes inside of
> 2048-byte region [ffff88808ee52000, ffff88808ee52800)
> The buggy address belongs to the page:
> page:ffffea00023b9480 refcount:1 mapcount:0 mapping:ffff8880aa400e00
> index:0xffff88808ee53100 compound_mapcount: 0
> flags: 0x1fffc0000010200(slab|head)
> raw: 01fffc0000010200 ffffea0001732108 ffffea00025f5588 ffff8880aa400e00
> raw: ffff88808ee53100 ffff88808ee52000 0000000100000002 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff88808ee51f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff88808ee52000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ffff88808ee52080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff88808ee52100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88808ee52180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: KASAN: use-after-free Read in nr_rx_frame (2)
[not found] <000000000000e42667058e554371@google.com>
2019-07-23 8:53 ` KASAN: use-after-free Read in nr_rx_frame (2) Dmitry Vyukov
@ 2019-07-31 7:30 ` syzbot
2019-07-31 21:32 ` syzbot
2 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2019-07-31 7:30 UTC (permalink / raw)
To: davem, dvyukov, linux-hams, linux-kernel, netdev, ralf,
syzkaller-bugs, xiyou.wangcong
syzbot has found a reproducer for the following crash on:
HEAD commit: 629f8205 Merge tag 'for-linus-20190730' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15856062600000
kernel config: https://syzkaller.appspot.com/x/.config?x=e397351d2615e10
dashboard link: https://syzkaller.appspot.com/bug?extid=701728447042217b67c1
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a6e008600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11937d92600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+701728447042217b67c1@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in atomic_read
include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x7c/0x280
lib/refcount.c:123
Read of size 4 at addr ffff8880893ccec0 by task swapper/0/0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc2+ #56
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113
print_address_description+0x75/0x5b0 mm/kasan/report.c:351
__kasan_report+0x14b/0x1c0 mm/kasan/report.c:482
kasan_report+0x26/0x50 mm/kasan/common.c:612
check_memory_region_inline mm/kasan/generic.c:182 [inline]
check_memory_region+0x2cf/0x2e0 mm/kasan/generic.c:192
__kasan_check_read+0x11/0x20 mm/kasan/common.c:92
atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
refcount_inc_not_zero_checked+0x7c/0x280 lib/refcount.c:123
refcount_inc_checked+0x15/0x50 lib/refcount.c:156
sock_hold include/net/sock.h:649 [inline]
sk_add_node include/net/sock.h:701 [inline]
nr_insert_socket net/netrom/af_netrom.c:137 [inline]
nr_rx_frame+0x17bc/0x1e40 net/netrom/af_netrom.c:1023
nr_loopback_timer+0x6a/0x140 net/netrom/nr_loopback.c:59
call_timer_fn+0xec/0x200 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers+0x7cd/0x9c0 kernel/time/timer.c:1685
run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1698
__do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x227/0x230 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1095
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828
</IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 01 fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 74 3b 01
fa eb b0 90 90 e9 07 00 00 00 0f 00 2d d6 36 51 00 fb f4 <c3> 90 e9 07 00
00 00 0f 00 2d c6 36 51 00 f4 c3 90 90 55 48 89 e5
RSP: 0018:ffffffff88c07cd8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11950f3 RBX: ffffffff88c75a00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff812d2b3a RDI: ffffffff87b14d9a
RBP: ffffffff88c07ce0 R08: ffffffff817d8974 R09: fffffbfff118eb41
R10: fffffbfff118eb41 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffffffff118eb40 R14: dffffc0000000000 R15: dffffc0000000000
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
default_idle_call+0x59/0xa0 kernel/sched/idle.c:94
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x180/0x780 kernel/sched/idle.c:263
cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:354
rest_init+0x29d/0x2b0 init/main.c:451
arch_call_rest_init+0xe/0x10
start_kernel+0x751/0x871 init/main.c:785
x86_64_start_reservations+0x18/0x2e arch/x86/kernel/head64.c:472
x86_64_start_kernel+0x7a/0x7d arch/x86/kernel/head64.c:453
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Allocated by task 0:
save_stack mm/kasan/common.c:69 [inline]
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:487
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
__do_kmalloc mm/slab.c:3655 [inline]
__kmalloc+0x254/0x340 mm/slab.c:3664
kmalloc include/linux/slab.h:557 [inline]
sk_prot_alloc+0xb0/0x290 net/core/sock.c:1603
sk_alloc+0x38/0x950 net/core/sock.c:1657
nr_make_new net/netrom/af_netrom.c:476 [inline]
nr_rx_frame+0xabc/0x1e40 net/netrom/af_netrom.c:959
nr_loopback_timer+0x6a/0x140 net/netrom/nr_loopback.c:59
call_timer_fn+0xec/0x200 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers+0x7cd/0x9c0 kernel/time/timer.c:1685
run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1698
__do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778
Freed by task 23150:
save_stack mm/kasan/common.c:69 [inline]
set_track mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:449
kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
__cache_free mm/slab.c:3425 [inline]
kfree+0x115/0x200 mm/slab.c:3756
sk_prot_free net/core/sock.c:1640 [inline]
__sk_destruct+0x567/0x660 net/core/sock.c:1726
sk_destruct net/core/sock.c:1734 [inline]
__sk_free+0x317/0x3e0 net/core/sock.c:1745
sk_free net/core/sock.c:1756 [inline]
sock_put include/net/sock.h:1725 [inline]
sock_efree+0x60/0x80 net/core/sock.c:2042
skb_release_head_state+0x100/0x220 net/core/skbuff.c:652
skb_release_all net/core/skbuff.c:663 [inline]
__kfree_skb+0x25/0x170 net/core/skbuff.c:679
kfree_skb+0x6f/0xb0 net/core/skbuff.c:697
nr_accept+0x4ef/0x650 net/netrom/af_netrom.c:819
__sys_accept4+0x5bc/0x9a0 net/socket.c:1754
__do_sys_accept net/socket.c:1795 [inline]
__se_sys_accept net/socket.c:1792 [inline]
__x64_sys_accept+0x7d/0x90 net/socket.c:1792
do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880893cce40
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
2048-byte region [ffff8880893cce40, ffff8880893cd640)
The buggy address belongs to the page:
page:ffffea000224f300 refcount:1 mapcount:0 mapping:ffff8880aa400e00
index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea0002924d08 ffffea00027f7288 ffff8880aa400e00
raw: 0000000000000000 ffff8880893cc5c0 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880893ccd80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880893cce00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
> ffff8880893cce80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880893ccf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880893ccf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
ODEBUG: activate not available (active state 0) object type: timer_list
hint: nr_heartbeat_expiry+0x0/0x420 net/netrom/nr_timer.c:193
WARNING: CPU: 0 PID: 0 at lib/debugobjects.c:484 debug_print_object
lib/debugobjects.c:481 [inline]
WARNING: CPU: 0 PID: 0 at lib/debugobjects.c:484
debug_object_activate+0x33d/0x6f0 lib/debugobjects.c:680
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 5.3.0-rc2+ #56
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:debug_print_object lib/debugobjects.c:481 [inline]
RIP: 0010:debug_object_activate+0x33d/0x6f0 lib/debugobjects.c:680
Code: f7 e8 47 04 4a fe 4d 8b 06 48 c7 c7 ba 55 88 88 48 c7 c6 00 2d a1 88
48 c7 c2 c3 68 81 88 31 c9 49 89 d9 31 c0 e8 93 6a e0 fd <0f> 0b 48 ba 00
00 00 00 00 fc ff df ff 05 55 99 95 05 49 83 c6 20
RSP: 0018:ffff8880aea09928 EFLAGS: 00010046
RAX: ec91b22b9b388e00 RBX: ffffffff86dc4cc0 RCX: ffffffff88c75a00
RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000000
RBP: ffff8880aea09970 R08: ffffffff816068e4 R09: fffffbfff119a975
R10: fffffbfff119a975 R11: 0000000000000000 R12: ffff888218471280
R13: 1ffff1104308e250 R14: ffffffff88cda040 R15: ffff8880893cd108
FS: 0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5db7f62db8 CR3: 00000000a0178000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
debug_timer_activate kernel/time/timer.c:710 [inline]
__mod_timer+0x960/0x16e0 kernel/time/timer.c:1035
mod_timer+0x1f/0x30 kernel/time/timer.c:1096
sk_reset_timer+0x22/0x50 net/core/sock.c:2821
nr_start_heartbeat+0x54/0x60 net/netrom/nr_timer.c:79
nr_rx_frame+0x184c/0x1e40 net/netrom/af_netrom.c:1025
nr_loopback_timer+0x6a/0x140 net/netrom/nr_loopback.c:59
call_timer_fn+0xec/0x200 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers+0x7cd/0x9c0 kernel/time/timer.c:1685
run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1698
__do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x227/0x230 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1095
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828
</IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 01 fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 74 3b 01
fa eb b0 90 90 e9 07 00 00 00 0f 00 2d d6 36 51 00 fb f4 <c3> 90 e9 07 00
00 00 0f 00 2d c6 36 51 00 f4 c3 90 90 55 48 89 e5
RSP: 0018:ffffffff88c07cd8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11950f3 RBX: ffffffff88c75a00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff812d2b3a RDI: ffffffff87b14d9a
RBP: ffffffff88c07ce0 R08: ffffffff817d8974 R09: fffffbfff118eb41
R10: fffffbfff118eb41 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffffffff118eb40 R14: dffffc0000000000 R15: dffffc0000000000
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
default_idle_call+0x59/0xa0 kernel/sched/idle.c:94
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x180/0x780 kernel/sched/idle.c:263
cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:354
rest_init+0x29d/0x2b0 init/main.c:451
arch_call_rest_init+0xe/0x10
start_kernel+0x751/0x871 init/main.c:785
x86_64_start_reservations+0x18/0x2e arch/x86/kernel/head64.c:472
x86_64_start_kernel+0x7a/0x7d arch/x86/kernel/head64.c:453
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
irq event stamp: 101048
hardirqs last enabled at (101047): [<ffffffff816b39fd>]
tick_nohz_idle_exit+0x2bd/0x3a0 kernel/time/tick-sched.c:1180
hardirqs last disabled at (101048): [<ffffffff87b07f01>]
__schedule+0x121/0xcd0 kernel/sched/core.c:3821
softirqs last enabled at (100320): [<ffffffff814a5627>] invoke_softirq
kernel/softirq.c:373 [inline]
softirqs last enabled at (100320): [<ffffffff814a5627>]
irq_exit+0x227/0x230 kernel/softirq.c:413
softirqs last disabled at (100307): [<ffffffff814a5627>] invoke_softirq
kernel/softirq.c:373 [inline]
softirqs last disabled at (100307): [<ffffffff814a5627>]
irq_exit+0x227/0x230 kernel/softirq.c:413
---[ end trace c1ceb269b6c91467 ]---
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: KASAN: use-after-free Read in nr_rx_frame (2)
[not found] <000000000000e42667058e554371@google.com>
2019-07-23 8:53 ` KASAN: use-after-free Read in nr_rx_frame (2) Dmitry Vyukov
2019-07-31 7:30 ` syzbot
@ 2019-07-31 21:32 ` syzbot
2 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2019-07-31 21:32 UTC (permalink / raw)
To: davem, dvyukov, linux-hams, linux-kernel, netdev, ralf,
syzkaller-bugs, xiyou.wangcong
syzbot has bisected this bug to:
commit c8c8218ec5af5d2598381883acbefbf604e56b5e
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Thu Jun 27 21:30:58 2019 +0000
netrom: fix a memory leak in nr_rx_frame()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=122ddaec600000
start commit: 629f8205 Merge tag 'for-linus-20190730' of git://git.kerne..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=112ddaec600000
console output: https://syzkaller.appspot.com/x/log.txt?x=162ddaec600000
kernel config: https://syzkaller.appspot.com/x/.config?x=e397351d2615e10
dashboard link: https://syzkaller.appspot.com/bug?extid=701728447042217b67c1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a6e008600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11937d92600000
Reported-by: syzbot+701728447042217b67c1@syzkaller.appspotmail.com
Fixes: c8c8218ec5af ("netrom: fix a memory leak in nr_rx_frame()")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 3+ messages in thread