* Re: KASAN: slab-out-of-bounds Read in sctp_send_reset_streams
[not found] <001a1140b830592056055fe5ec80@google.com>
@ 2017-12-09 11:35 ` Xin Long
2017-12-09 11:58 ` Xin Long
2018-01-31 21:06 ` Eric Biggers
1 sibling, 1 reply; 3+ messages in thread
From: Xin Long @ 2017-12-09 11:35 UTC (permalink / raw)
To: syzbot
Cc: davem, LKML, linux-sctp, network dev, Neil Horman, syzkaller-bugs,
Vlad Yasevich
On Sat, Dec 9, 2017 at 6:40 PM, syzbot
<bot+0665d43fa62276c7a5e3372929aa0bab96260979@syzkaller.appspotmail.com>
wrote:
> Hello,
>
> syzkaller hit the following crash on
> 328b4ed93b69a6f2083d52f31a240a09e5de386a
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> =================================
> BUG: KASAN: slab-out-of-bounds in sctp_send_reset_streams+0xadf/0xc10
> net/sctp/stream.c:314
> Read of size 2 at addr ffff8801d8a6c048 by task syzkaller104411/3085
>
> CPU: 0 PID: 3085 Comm: syzkaller104411 Not tainted 4.15.0-rc2+ #119
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __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_load2_noabort+0x14/0x20 mm/kasan/report.c:428
> sctp_send_reset_streams+0xadf/0xc10 net/sctp/stream.c:314
> sctp_setsockopt_reset_streams net/sctp/socket.c:3905 [inline]
> sctp_setsockopt+0x70d/0x5d50 net/sctp/socket.c:4195
> compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
> C_SYSC_setsockopt net/compat.c:403 [inline]
> compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
> entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
> RIP: 0023:0xf7f1bc79
> RSP: 002b:00000000ff9893bc EFLAGS: 00000282 ORIG_RAX: 000000000000016e
> RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000000084
> RDX: 0000000000000077 RSI: 000000002018b000 RDI: 0000000000000008
> RBP: 000000000000001c R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>
> Allocated by task 3085:
> 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
> __do_kmalloc mm/slab.c:3711 [inline]
> __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3726
> memdup_user+0x2c/0x90 mm/util.c:164
> sctp_setsockopt_reset_streams net/sctp/socket.c:3897 [inline]
> sctp_setsockopt+0x6a6/0x5d50 net/sctp/socket.c:4195
> compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
> C_SYSC_setsockopt net/compat.c:403 [inline]
> compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
> entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
>
> Freed by task 16:
> 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
> selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3814
> security_cred_free+0x48/0x80 security/security.c:995
> put_cred_rcu+0x106/0x400 kernel/cred.c:117
> __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 ffff8801d8a6c040
> which belongs to the cache kmalloc-32 of size 32
> The buggy address is located 8 bytes inside of
> 32-byte region [ffff8801d8a6c040, ffff8801d8a6c060)
> The buggy address belongs to the page:
> page:000000006b05592a count:1 mapcount:0 mapping:000000001ca7267d
> index:0xffff8801d8a6cfc1
> flags: 0x2fffc0000000100(slab)
> raw: 02fffc0000000100 ffff8801d8a6c000 ffff8801d8a6cfc1 000000010000003f
> raw: ffffea000762f920 ffffea00076133e0 ffff8801db0001c0 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff8801d8a6bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801d8a6bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>>
>> ffff8801d8a6c000: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
>
> ^
> ffff8801d8a6c080: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
> ffff8801d8a6c100: fb fb fb fb 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 syzkaller@googlegroups.com.
> Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com>
>
> syzbot will keep track of this bug report.
> Once a fix for this bug is merged into any tree, reply to this email with:
> #syz fix: exact-commit-title
> If you want to test a patch for this bug, please reply with:
> #syz test: git://repo/address.git branch
> and provide the patch inline or as an attachment.
> 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.
the check:
if (optlen < sizeof(struct sctp_reset_streams))
in sctp_setsockopt_reset_streams() is not correct, the srs_stream_list
memory should have been counted as well.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KASAN: slab-out-of-bounds Read in sctp_send_reset_streams
2017-12-09 11:35 ` KASAN: slab-out-of-bounds Read in sctp_send_reset_streams Xin Long
@ 2017-12-09 11:58 ` Xin Long
0 siblings, 0 replies; 3+ messages in thread
From: Xin Long @ 2017-12-09 11:58 UTC (permalink / raw)
To: syzbot
Cc: davem, LKML, linux-sctp, network dev, Neil Horman, syzkaller-bugs,
Vlad Yasevich
On Sat, Dec 9, 2017 at 7:35 PM, Xin Long <lucien.xin@gmail.com> wrote:
> On Sat, Dec 9, 2017 at 6:40 PM, syzbot
> <bot+0665d43fa62276c7a5e3372929aa0bab96260979@syzkaller.appspotmail.com>
> wrote:
>> Hello,
>>
>> syzkaller hit the following crash on
>> 328b4ed93b69a6f2083d52f31a240a09e5de386a
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.
>> C reproducer is attached
>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> for information about syzkaller reproducers
>>
>>
>> =================================
>> BUG: KASAN: slab-out-of-bounds in sctp_send_reset_streams+0xadf/0xc10
>> net/sctp/stream.c:314
>> Read of size 2 at addr ffff8801d8a6c048 by task syzkaller104411/3085
>>
>> CPU: 0 PID: 3085 Comm: syzkaller104411 Not tainted 4.15.0-rc2+ #119
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>> __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_load2_noabort+0x14/0x20 mm/kasan/report.c:428
>> sctp_send_reset_streams+0xadf/0xc10 net/sctp/stream.c:314
>> sctp_setsockopt_reset_streams net/sctp/socket.c:3905 [inline]
>> sctp_setsockopt+0x70d/0x5d50 net/sctp/socket.c:4195
>> compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
>> C_SYSC_setsockopt net/compat.c:403 [inline]
>> compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
>> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
>> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
>> entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
>> RIP: 0023:0xf7f1bc79
>> RSP: 002b:00000000ff9893bc EFLAGS: 00000282 ORIG_RAX: 000000000000016e
>> RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000000084
>> RDX: 0000000000000077 RSI: 000000002018b000 RDI: 0000000000000008
>> RBP: 000000000000001c R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>>
>> Allocated by task 3085:
>> 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
>> __do_kmalloc mm/slab.c:3711 [inline]
>> __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3726
>> memdup_user+0x2c/0x90 mm/util.c:164
>> sctp_setsockopt_reset_streams net/sctp/socket.c:3897 [inline]
>> sctp_setsockopt+0x6a6/0x5d50 net/sctp/socket.c:4195
>> compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
>> C_SYSC_setsockopt net/compat.c:403 [inline]
>> compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
>> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
>> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
>> entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
>>
>> Freed by task 16:
>> 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
>> selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3814
>> security_cred_free+0x48/0x80 security/security.c:995
>> put_cred_rcu+0x106/0x400 kernel/cred.c:117
>> __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 ffff8801d8a6c040
>> which belongs to the cache kmalloc-32 of size 32
>> The buggy address is located 8 bytes inside of
>> 32-byte region [ffff8801d8a6c040, ffff8801d8a6c060)
>> The buggy address belongs to the page:
>> page:000000006b05592a count:1 mapcount:0 mapping:000000001ca7267d
>> index:0xffff8801d8a6cfc1
>> flags: 0x2fffc0000000100(slab)
>> raw: 02fffc0000000100 ffff8801d8a6c000 ffff8801d8a6cfc1 000000010000003f
>> raw: ffffea000762f920 ffffea00076133e0 ffff8801db0001c0 0000000000000000
>> page dumped because: kasan: bad access detected
>>
>> Memory state around the buggy address:
>> ffff8801d8a6bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>> ffff8801d8a6bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>>>
>>> ffff8801d8a6c000: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
>>
>> ^
>> ffff8801d8a6c080: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
>> ffff8801d8a6c100: fb fb fb fb 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 syzkaller@googlegroups.com.
>> Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com>
>>
>> syzbot will keep track of this bug report.
>> Once a fix for this bug is merged into any tree, reply to this email with:
>> #syz fix: exact-commit-title
>> If you want to test a patch for this bug, please reply with:
>> #syz test: git://repo/address.git branch
>> and provide the patch inline or as an attachment.
>> 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.
> the check:
> if (optlen < sizeof(struct sctp_reset_streams))
> in sctp_setsockopt_reset_streams() is not correct, the srs_stream_list
> memory should have been counted as well.
Fix:
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index ac6338f..1532a49 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3930,6 +3930,10 @@ static int sctp_setsockopt_reset_streams(struct sock *sk,
if (IS_ERR(params))
return PTR_ERR(params);
+ if (params->srs_number_streams * sizeof(__u16) >
+ optlen - sizeof(*params))
+ goto out;
+
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: KASAN: slab-out-of-bounds Read in sctp_send_reset_streams
[not found] <001a1140b830592056055fe5ec80@google.com>
2017-12-09 11:35 ` KASAN: slab-out-of-bounds Read in sctp_send_reset_streams Xin Long
@ 2018-01-31 21:06 ` Eric Biggers
1 sibling, 0 replies; 3+ messages in thread
From: Eric Biggers @ 2018-01-31 21:06 UTC (permalink / raw)
To: syzbot
Cc: davem, linux-kernel, linux-sctp, netdev, nhorman, syzkaller-bugs,
vyasevich, lucien.xin
On Sat, Dec 09, 2017 at 02:40:00AM -0800, syzbot wrote:
> Hello,
>
> syzkaller hit the following crash on
> 328b4ed93b69a6f2083d52f31a240a09e5de386a
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> =================================
> BUG: KASAN: slab-out-of-bounds in sctp_send_reset_streams+0xadf/0xc10
> net/sctp/stream.c:314
> Read of size 2 at addr ffff8801d8a6c048 by task syzkaller104411/3085
>
> CPU: 0 PID: 3085 Comm: syzkaller104411 Not tainted 4.15.0-rc2+ #119
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __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_load2_noabort+0x14/0x20 mm/kasan/report.c:428
> sctp_send_reset_streams+0xadf/0xc10 net/sctp/stream.c:314
> sctp_setsockopt_reset_streams net/sctp/socket.c:3905 [inline]
> sctp_setsockopt+0x70d/0x5d50 net/sctp/socket.c:4195
> compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
> C_SYSC_setsockopt net/compat.c:403 [inline]
> compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
> entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
> RIP: 0023:0xf7f1bc79
> RSP: 002b:00000000ff9893bc EFLAGS: 00000282 ORIG_RAX: 000000000000016e
> RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000000084
> RDX: 0000000000000077 RSI: 000000002018b000 RDI: 0000000000000008
> RBP: 000000000000001c R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>
> Allocated by task 3085:
> 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
> __do_kmalloc mm/slab.c:3711 [inline]
> __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3726
> memdup_user+0x2c/0x90 mm/util.c:164
> sctp_setsockopt_reset_streams net/sctp/socket.c:3897 [inline]
> sctp_setsockopt+0x6a6/0x5d50 net/sctp/socket.c:4195
> compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
> C_SYSC_setsockopt net/compat.c:403 [inline]
> compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
> entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
>
> Freed by task 16:
> 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
> selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3814
> security_cred_free+0x48/0x80 security/security.c:995
> put_cred_rcu+0x106/0x400 kernel/cred.c:117
> __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 ffff8801d8a6c040
> which belongs to the cache kmalloc-32 of size 32
> The buggy address is located 8 bytes inside of
> 32-byte region [ffff8801d8a6c040, ffff8801d8a6c060)
> The buggy address belongs to the page:
> page:000000006b05592a count:1 mapcount:0 mapping:000000001ca7267d
> index:0xffff8801d8a6cfc1
> flags: 0x2fffc0000000100(slab)
> raw: 02fffc0000000100 ffff8801d8a6c000 ffff8801d8a6cfc1 000000010000003f
> raw: ffffea000762f920 ffffea00076133e0 ffff8801db0001c0 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff8801d8a6bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801d8a6bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ffff8801d8a6c000: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
> ^
> ffff8801d8a6c080: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
> ffff8801d8a6c100: fb fb fb fb 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 syzkaller@googlegroups.com.
> Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com>
>
> syzbot will keep track of this bug report.
> Once a fix for this bug is merged into any tree, reply to this email with:
> #syz fix: exact-commit-title
This crash is no longer occurring. I assume it was fixed by commit
2342b8d95bcae5 (thanks Xin!), so let's tell syzbot:
#syz fix: sctp: make sure stream nums can match optlen in sctp_setsockopt_reset_streams
- Eric
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2017-12-09 11:35 ` KASAN: slab-out-of-bounds Read in sctp_send_reset_streams Xin Long
2017-12-09 11:58 ` Xin Long
2018-01-31 21:06 ` Eric Biggers
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