KASAN: invalid-free in shmem_destroy_callback
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syzbot
Apr 22, 2018, 9:02:04 PM4/22/18
to syzkaller-upst...@googlegroups.com
Hello,
syzbot hit the following crash on net-next commit
cf1a1e07fc8bb29947ad3c9568d73aee3f851431 (Fri Apr 20 11:18:16 2018 +0000)
tun: do not compute the rxhash, if not needed
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=aadcf1130d40ff62031e
Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=5644066041626624
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-8412024688694752032
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [hu...@google.com linux-...@vger.kernel.org linu...@kvack.org]
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+aadcf1...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
netlink: 'syz-executor4': attribute type 25 has an invalid length.
netlink: 3 bytes leftover after parsing attributes in process
`syz-executor4'.
netlink: 'syz-executor4': attribute type 25 has an invalid length.
netlink: 3 bytes leftover after parsing attributes in process
`syz-executor4'.
==================================================================
BUG: KASAN: double-free or invalid-free in shmem_destroy_callback+0xa2/0xc0
mm/shmem.c:3865
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.16.0+ #10
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+0x1b9/0x294 lib/dump_stack.c:113
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_invalid_free+0x55/0x80 mm/kasan/report.c:336
__kasan_slab_free+0x150/0x170 mm/kasan/kasan.c:501
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xd9/0x260 mm/slab.c:3813
shmem_destroy_callback+0xa2/0xc0 mm/shmem.c:3865
__rcu_reclaim kernel/rcu/rcu.h:178 [inline]
rcu_do_batch kernel/rcu/tree.c:2675 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914
__do_softirq+0x2e0/0xaf5 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1d1/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:525 [inline]
smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000
RDX: 1ffffffff11a30f0 RSI: 0000000000000001 RDI: ffffffff88d18780
RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88c07c78 R14: ffffffff897ba8e0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xc2/0x440 arch/x86/kernel/process.c:354
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:345
default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x395/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:368
rest_init+0xe1/0xe4 init/main.c:441
start_kernel+0x906/0x92d init/main.c:737
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:443
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:424
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242
Allocated by task 4488:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
__do_kmalloc_node mm/slab.c:3682 [inline]
__kmalloc_node+0x47/0x70 mm/slab.c:3689
kmalloc_node include/linux/slab.h:554 [inline]
__vmalloc_area_node mm/vmalloc.c:1686 [inline]
__vmalloc_node_range+0x1f5/0x720 mm/vmalloc.c:1759
__vmalloc_node mm/vmalloc.c:1804 [inline]
__vmalloc_node_flags mm/vmalloc.c:1818 [inline]
vzalloc+0x45/0x50 mm/vmalloc.c:1857
alloc_counters.isra.11+0xaf/0x820 net/ipv4/netfilter/ip_tables.c:801
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:823 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1025 [inline]
do_ipt_get_ctl+0x7e0/0xc00 net/ipv4/netfilter/ip_tables.c:1701
nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122
ip_getsockopt+0x1a0/0x230 net/ipv4/ip_sockglue.c:1564
tcp_getsockopt+0x93/0xe0 net/ipv4/tcp.c:3490
sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3001
__sys_getsockopt+0x1a5/0x370 net/socket.c:1940
SYSC_getsockopt net/socket.c:1951 [inline]
SyS_getsockopt+0x34/0x50 net/socket.c:1948
do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 4488:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xd9/0x260 mm/slab.c:3813
kvfree+0x61/0x70 mm/util.c:438
__vunmap+0x2c5/0x3c0 mm/vmalloc.c:1542
vfree+0x68/0x100 mm/vmalloc.c:1606
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:868 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1025 [inline]
do_ipt_get_ctl+0xa1f/0xc00 net/ipv4/netfilter/ip_tables.c:1701
nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122
ip_getsockopt+0x1a0/0x230 net/ipv4/ip_sockglue.c:1564
tcp_getsockopt+0x93/0xe0 net/ipv4/tcp.c:3490
sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3001
__sys_getsockopt+0x1a5/0x370 net/socket.c:1940
SYSC_getsockopt net/socket.c:1951 [inline]
SyS_getsockopt+0x34/0x50 net/socket.c:1948
do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff8801d6c26300
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8801d6c26300, ffff8801d6c26320)
The buggy address belongs to the page:
page:ffffea00075b0980 count:1 mapcount:0 mapping:ffff8801d6c26000
index:0xffff8801d6c26fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d6c26000 ffff8801d6c26fc1 000000010000003e
raw: ffffea00075ce960 ffffea0007619520 ffff8801da8001c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801d6c26200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8801d6c26280: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
> ffff8801d6c26300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8801d6c26380: fb fb fb fb fc fc fc fc 00 00 03 fc fc fc fc fc
ffff8801d6c26400: 00 04 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.
To upstream this report, please reply with:
#syz upstream
syzbot hit the following crash on net-next commit
cf1a1e07fc8bb29947ad3c9568d73aee3f851431 (Fri Apr 20 11:18:16 2018 +0000)
tun: do not compute the rxhash, if not needed
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=aadcf1130d40ff62031e
Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=5644066041626624
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-8412024688694752032
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [hu...@google.com linux-...@vger.kernel.org linu...@kvack.org]
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+aadcf1...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
netlink: 'syz-executor4': attribute type 25 has an invalid length.
netlink: 3 bytes leftover after parsing attributes in process
`syz-executor4'.
netlink: 'syz-executor4': attribute type 25 has an invalid length.
netlink: 3 bytes leftover after parsing attributes in process
`syz-executor4'.
==================================================================
BUG: KASAN: double-free or invalid-free in shmem_destroy_callback+0xa2/0xc0
mm/shmem.c:3865
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.16.0+ #10
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+0x1b9/0x294 lib/dump_stack.c:113
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_invalid_free+0x55/0x80 mm/kasan/report.c:336
__kasan_slab_free+0x150/0x170 mm/kasan/kasan.c:501
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xd9/0x260 mm/slab.c:3813
shmem_destroy_callback+0xa2/0xc0 mm/shmem.c:3865
__rcu_reclaim kernel/rcu/rcu.h:178 [inline]
rcu_do_batch kernel/rcu/tree.c:2675 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914
__do_softirq+0x2e0/0xaf5 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1d1/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:525 [inline]
smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000
RDX: 1ffffffff11a30f0 RSI: 0000000000000001 RDI: ffffffff88d18780
RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88c07c78 R14: ffffffff897ba8e0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xc2/0x440 arch/x86/kernel/process.c:354
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:345
default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x395/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:368
rest_init+0xe1/0xe4 init/main.c:441
start_kernel+0x906/0x92d init/main.c:737
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:443
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:424
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242
Allocated by task 4488:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
__do_kmalloc_node mm/slab.c:3682 [inline]
__kmalloc_node+0x47/0x70 mm/slab.c:3689
kmalloc_node include/linux/slab.h:554 [inline]
__vmalloc_area_node mm/vmalloc.c:1686 [inline]
__vmalloc_node_range+0x1f5/0x720 mm/vmalloc.c:1759
__vmalloc_node mm/vmalloc.c:1804 [inline]
__vmalloc_node_flags mm/vmalloc.c:1818 [inline]
vzalloc+0x45/0x50 mm/vmalloc.c:1857
alloc_counters.isra.11+0xaf/0x820 net/ipv4/netfilter/ip_tables.c:801
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:823 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1025 [inline]
do_ipt_get_ctl+0x7e0/0xc00 net/ipv4/netfilter/ip_tables.c:1701
nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122
ip_getsockopt+0x1a0/0x230 net/ipv4/ip_sockglue.c:1564
tcp_getsockopt+0x93/0xe0 net/ipv4/tcp.c:3490
sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3001
__sys_getsockopt+0x1a5/0x370 net/socket.c:1940
SYSC_getsockopt net/socket.c:1951 [inline]
SyS_getsockopt+0x34/0x50 net/socket.c:1948
do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 4488:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xd9/0x260 mm/slab.c:3813
kvfree+0x61/0x70 mm/util.c:438
__vunmap+0x2c5/0x3c0 mm/vmalloc.c:1542
vfree+0x68/0x100 mm/vmalloc.c:1606
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:868 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1025 [inline]
do_ipt_get_ctl+0xa1f/0xc00 net/ipv4/netfilter/ip_tables.c:1701
nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122
ip_getsockopt+0x1a0/0x230 net/ipv4/ip_sockglue.c:1564
tcp_getsockopt+0x93/0xe0 net/ipv4/tcp.c:3490
sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3001
__sys_getsockopt+0x1a5/0x370 net/socket.c:1940
SYSC_getsockopt net/socket.c:1951 [inline]
SyS_getsockopt+0x34/0x50 net/socket.c:1948
do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff8801d6c26300
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8801d6c26300, ffff8801d6c26320)
The buggy address belongs to the page:
page:ffffea00075b0980 count:1 mapcount:0 mapping:ffff8801d6c26000
index:0xffff8801d6c26fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d6c26000 ffff8801d6c26fc1 000000010000003e
raw: ffffea00075ce960 ffffea0007619520 ffff8801da8001c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801d6c26200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8801d6c26280: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
> ffff8801d6c26300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8801d6c26380: fb fb fb fb fc fc fc fc 00 00 03 fc fc fc fc fc
ffff8801d6c26400: 00 04 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.
To upstream this report, please reply with:
#syz upstream
Dmitry Vyukov
May 26, 2018, 1:44:05 PM5/26/18
to syzbot, 'Dmitry Vyukov' via syzkaller-upstream-moderation
corruption. Happened only once.
#syz invalid
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