[v6.1] KASAN: use-after-free Write in mini_qdisc_pair_swap
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syzbot
May 19, 2023, 9:51:55 AM5/19/23
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: fa74641fb6b9 Linux 6.1.29
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=108aafce280000
kernel config: https://syzkaller.appspot.com/x/.config?x=fac5c36c2b16009f
dashboard link: https://syzkaller.appspot.com/bug?extid=56403acf9209de69d34b
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15d3e9d9280000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3e78f005d7f8/disk-fa74641f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6527fcf66401/vmlinux-fa74641f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c5e0d5f8b434/bzImage-fa74641f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+56403a...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in mini_qdisc_pair_swap+0x1ad/0x1c0 net/sched/sch_generic.c:1573
Write of size 8 at addr ffff88805cf1db08 by task syz-executor.4/8902
CPU: 0 PID: 8902 Comm: syz-executor.4 Not tainted 6.1.29-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:395
kasan_report+0x136/0x160 mm/kasan/report.c:495
mini_qdisc_pair_swap+0x1ad/0x1c0 net/sched/sch_generic.c:1573
tcf_chain_head_change_item net/sched/cls_api.c:390 [inline]
tcf_chain0_head_change net/sched/cls_api.c:404 [inline]
tcf_chain_tp_insert net/sched/cls_api.c:1679 [inline]
tcf_chain_tp_insert_unique+0xb63/0xd50 net/sched/cls_api.c:1728
tc_new_tfilter+0x1614/0x1a80 net/sched/cls_api.c:2106
rtnetlink_rcv_msg+0x7c3/0xf00 net/core/rtnetlink.c:6082
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2cece8c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2cedb07168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f2cecfac120 RCX: 00007f2cece8c169
RDX: 040000000000009f RSI: 00000000200002c0 RDI: 0000000000000006
RBP: 00007f2cecee7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffedafffc1f R14: 00007f2cedb07300 R15: 0000000000022000
</TASK>
Allocated by task 8900:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:955 [inline]
__kmalloc_node+0xb3/0x230 mm/slab_common.c:962
kmalloc_node include/linux/slab.h:579 [inline]
kzalloc_node include/linux/slab.h:700 [inline]
qdisc_alloc+0x90/0x950 net/sched/sch_generic.c:938
qdisc_create+0x176/0x1130 net/sched/sch_api.c:1235
tc_modify_qdisc+0xa5f/0x1c00
rtnetlink_rcv_msg+0x776/0xf00 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 21:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook mm/slub.c:1750 [inline]
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674
rcu_do_batch kernel/rcu/tree.c:2251 [inline]
rcu_core+0xa9a/0x1790 kernel/rcu/tree.c:2511
__do_softirq+0x2e9/0xa4c kernel/softirq.c:571
Last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
call_rcu+0x163/0xa10 kernel/rcu/tree.c:2799
qdisc_put_unlocked+0x55/0x90 net/sched/sch_generic.c:1097
tcf_block_release net/sched/cls_api.c:1256 [inline]
tc_new_tfilter+0x14b9/0x1a80 net/sched/cls_api.c:2169
rtnetlink_rcv_msg+0x7c3/0xf00 net/core/rtnetlink.c:6082
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Second to last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
call_rcu+0x163/0xa10 kernel/rcu/tree.c:2799
notify_and_destroy net/sched/sch_api.c:1030 [inline]
qdisc_graft+0x113b/0x1460 net/sched/sch_api.c:1107
tc_modify_qdisc+0xe40/0x1c00 net/sched/sch_api.c:1688
rtnetlink_rcv_msg+0x776/0xf00 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff88805cf1d800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 776 bytes inside of
1024-byte region [ffff88805cf1d800, ffff88805cf1dc00)
The buggy address belongs to the physical page:
page:ffffea000173c600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5cf18
head:ffffea000173c600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888012441dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6908, tgid 6896 (syz-executor.0), ts 274054254620, free_ts 15611928453
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2533
prep_new_page mm/page_alloc.c:2540 [inline]
get_page_from_freelist+0x32ed/0x3480 mm/page_alloc.c:4292
__alloc_pages+0x28d/0x770 mm/page_alloc.c:5559
alloc_slab_page+0x6a/0x150 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x84/0x2d0 mm/slub.c:1992
___slab_alloc+0xa71/0x1080 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc_node+0xa2/0x230 mm/slab_common.c:962
kmalloc_node include/linux/slab.h:579 [inline]
kzalloc_node include/linux/slab.h:700 [inline]
qdisc_alloc+0x90/0x950 net/sched/sch_generic.c:938
qdisc_create+0x176/0x1130 net/sched/sch_api.c:1235
tc_modify_qdisc+0xa5f/0x1c00
rtnetlink_rcv_msg+0x776/0xf00 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1460 [inline]
free_pcp_prepare mm/page_alloc.c:1510 [inline]
free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3388
free_unref_page+0x98/0x570 mm/page_alloc.c:3484
free_contig_range+0x9a/0x150 mm/page_alloc.c:9519
destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031
debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354
do_one_initcall+0x265/0x8f0 init/main.c:1303
do_initcall_level+0x157/0x207 init/main.c:1376
do_initcalls+0x49/0x86 init/main.c:1392
kernel_init_freeable+0x473/0x61f init/main.c:1631
kernel_init+0x19/0x290 init/main.c:1519
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Memory state around the buggy address:
ffff88805cf1da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805cf1da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805cf1db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805cf1db80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805cf1dc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
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If the bug is already fixed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
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If you want to change bug's subsystems, reply with:
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If the bug is a duplicate of another bug, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: fa74641fb6b9 Linux 6.1.29
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=108aafce280000
kernel config: https://syzkaller.appspot.com/x/.config?x=fac5c36c2b16009f
dashboard link: https://syzkaller.appspot.com/bug?extid=56403acf9209de69d34b
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15d3e9d9280000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3e78f005d7f8/disk-fa74641f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6527fcf66401/vmlinux-fa74641f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c5e0d5f8b434/bzImage-fa74641f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+56403a...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in mini_qdisc_pair_swap+0x1ad/0x1c0 net/sched/sch_generic.c:1573
Write of size 8 at addr ffff88805cf1db08 by task syz-executor.4/8902
CPU: 0 PID: 8902 Comm: syz-executor.4 Not tainted 6.1.29-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:395
kasan_report+0x136/0x160 mm/kasan/report.c:495
mini_qdisc_pair_swap+0x1ad/0x1c0 net/sched/sch_generic.c:1573
tcf_chain_head_change_item net/sched/cls_api.c:390 [inline]
tcf_chain0_head_change net/sched/cls_api.c:404 [inline]
tcf_chain_tp_insert net/sched/cls_api.c:1679 [inline]
tcf_chain_tp_insert_unique+0xb63/0xd50 net/sched/cls_api.c:1728
tc_new_tfilter+0x1614/0x1a80 net/sched/cls_api.c:2106
rtnetlink_rcv_msg+0x7c3/0xf00 net/core/rtnetlink.c:6082
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2cece8c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2cedb07168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f2cecfac120 RCX: 00007f2cece8c169
RDX: 040000000000009f RSI: 00000000200002c0 RDI: 0000000000000006
RBP: 00007f2cecee7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffedafffc1f R14: 00007f2cedb07300 R15: 0000000000022000
</TASK>
Allocated by task 8900:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:955 [inline]
__kmalloc_node+0xb3/0x230 mm/slab_common.c:962
kmalloc_node include/linux/slab.h:579 [inline]
kzalloc_node include/linux/slab.h:700 [inline]
qdisc_alloc+0x90/0x950 net/sched/sch_generic.c:938
qdisc_create+0x176/0x1130 net/sched/sch_api.c:1235
tc_modify_qdisc+0xa5f/0x1c00
rtnetlink_rcv_msg+0x776/0xf00 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 21:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook mm/slub.c:1750 [inline]
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674
rcu_do_batch kernel/rcu/tree.c:2251 [inline]
rcu_core+0xa9a/0x1790 kernel/rcu/tree.c:2511
__do_softirq+0x2e9/0xa4c kernel/softirq.c:571
Last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
call_rcu+0x163/0xa10 kernel/rcu/tree.c:2799
qdisc_put_unlocked+0x55/0x90 net/sched/sch_generic.c:1097
tcf_block_release net/sched/cls_api.c:1256 [inline]
tc_new_tfilter+0x14b9/0x1a80 net/sched/cls_api.c:2169
rtnetlink_rcv_msg+0x7c3/0xf00 net/core/rtnetlink.c:6082
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Second to last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
call_rcu+0x163/0xa10 kernel/rcu/tree.c:2799
notify_and_destroy net/sched/sch_api.c:1030 [inline]
qdisc_graft+0x113b/0x1460 net/sched/sch_api.c:1107
tc_modify_qdisc+0xe40/0x1c00 net/sched/sch_api.c:1688
rtnetlink_rcv_msg+0x776/0xf00 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmmsg+0x3ab/0x730 net/socket.c:2622
__do_sys_sendmmsg net/socket.c:2651 [inline]
__se_sys_sendmmsg net/socket.c:2648 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff88805cf1d800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 776 bytes inside of
1024-byte region [ffff88805cf1d800, ffff88805cf1dc00)
The buggy address belongs to the physical page:
page:ffffea000173c600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5cf18
head:ffffea000173c600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888012441dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6908, tgid 6896 (syz-executor.0), ts 274054254620, free_ts 15611928453
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2533
prep_new_page mm/page_alloc.c:2540 [inline]
get_page_from_freelist+0x32ed/0x3480 mm/page_alloc.c:4292
__alloc_pages+0x28d/0x770 mm/page_alloc.c:5559
alloc_slab_page+0x6a/0x150 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x84/0x2d0 mm/slub.c:1992
___slab_alloc+0xa71/0x1080 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc_node+0xa2/0x230 mm/slab_common.c:962
kmalloc_node include/linux/slab.h:579 [inline]
kzalloc_node include/linux/slab.h:700 [inline]
qdisc_alloc+0x90/0x950 net/sched/sch_generic.c:938
qdisc_create+0x176/0x1130 net/sched/sch_api.c:1235
tc_modify_qdisc+0xa5f/0x1c00
rtnetlink_rcv_msg+0x776/0xf00 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2524
netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1902
sock_sendmsg_nosec net/socket.c:716 [inline]
sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1460 [inline]
free_pcp_prepare mm/page_alloc.c:1510 [inline]
free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3388
free_unref_page+0x98/0x570 mm/page_alloc.c:3484
free_contig_range+0x9a/0x150 mm/page_alloc.c:9519
destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031
debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354
do_one_initcall+0x265/0x8f0 init/main.c:1303
do_initcall_level+0x157/0x207 init/main.c:1376
do_initcalls+0x49/0x86 init/main.c:1392
kernel_init_freeable+0x473/0x61f init/main.c:1631
kernel_init+0x19/0x290 init/main.c:1519
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Memory state around the buggy address:
ffff88805cf1da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805cf1da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805cf1db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805cf1db80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805cf1dc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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