[syzbot] [trace?] [bpf?] KASAN: slab-use-after-free Read in bpf_trace_run4

From: syzbot
Date: Thu Mar 21 2024 - 05:01:57 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 520fad2e3206 selftests/bpf: scale benchmark counting by us..
git tree: bpf-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=121c0679180000
kernel config: https://syzkaller.appspot.com/x/.config?x=6fb1be60a193d440
dashboard link: https://syzkaller.appspot.com/bug?extid=62d8b26793e8a2bd0516
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dc4231180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1705d185180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4eef3506c5ce/disk-520fad2e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/24d60ebe76cc/vmlinux-520fad2e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8f883e706550/bzImage-520fad2e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+62d8b26793e8a2bd0516@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2376 [inline]
BUG: KASAN: slab-use-after-free in bpf_trace_run4+0x143/0x580 kernel/trace/bpf_trace.c:2433
Read of size 8 at addr ffff8880238ba918 by task sshd/5076

CPU: 1 PID: 5076 Comm: sshd Not tainted 6.8.0-syzkaller-05233-g520fad2e3206 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
__bpf_trace_run kernel/trace/bpf_trace.c:2376 [inline]
bpf_trace_run4+0x143/0x580 kernel/trace/bpf_trace.c:2433
__traceiter_mm_page_alloc+0x3a/0x60 include/trace/events/kmem.h:177
trace_mm_page_alloc include/trace/events/kmem.h:177 [inline]
__alloc_pages+0x657/0x680 mm/page_alloc.c:4591
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2190
allocate_slab mm/slub.c:2354 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2407
___slab_alloc+0xd1b/0x13e0 mm/slub.c:3540
__kmem_cache_alloc_bulk mm/slub.c:4574 [inline]
kmem_cache_alloc_bulk+0x22e/0x790 mm/slub.c:4648
napi_skb_cache_get+0x166/0x230 net/core/skbuff.c:348
__napi_build_skb net/core/skbuff.c:527 [inline]
__napi_alloc_skb+0x217/0x540 net/core/skbuff.c:846
napi_alloc_skb include/linux/skbuff.h:3363 [inline]
page_to_skb+0x275/0x9b0 drivers/net/virtio_net.c:569
receive_mergeable drivers/net/virtio_net.c:1683 [inline]
receive_buf+0x3b3/0x3890 drivers/net/virtio_net.c:1804
virtnet_receive drivers/net/virtio_net.c:2110 [inline]
virtnet_poll+0x720/0x18f0 drivers/net/virtio_net.c:2203
__napi_poll+0xcb/0x490 net/core/dev.c:6632
napi_poll net/core/dev.c:6701 [inline]
net_rx_action+0x7bb/0x1090 net/core/dev.c:6813
__do_softirq+0x2bc/0x943 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
common_interrupt+0xaa/0xd0 arch/x86/kernel/irq.c:247
</IRQ>
<TASK>
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:kasan_check_range+0x1b7/0x290 mm/kasan/generic.c:189
Code: f5 4d 01 fb 48 8d 5d 07 48 85 ed 48 0f 49 dd 48 83 e3 f8 48 29 dd 74 12 41 80 3b 00 0f 85 a6 00 00 00 49 ff c3 48 ff cd 75 ee <5b> 41 5c 41 5e 41 5f 5d c3 cc cc cc cc 40 84 ed 75 5f f7 c5 00 ff
RSP: 0018:ffffc900039ff950 EFLAGS: 00000256
RAX: ffffffff845bbe01 RBX: 1ffff9200073ff40 RCX: ffffffff845bbe35
RDX: 0000000000000001 RSI: 0000000000000030 RDI: ffffc900039ffa00
RBP: 0000000000000000 R08: ffffc900039ffa2f R09: 1ffff9200073ff45
R10: dffffc0000000000 R11: fffff5200073ff46 R12: 1ffff9200073ff3c
R13: dffffc0000000000 R14: dffffc0000000001 R15: fffff5200073ff46
__asan_memset+0x23/0x50 mm/kasan/shadow.c:84
tomoyo_socket_sendmsg_permission+0x95/0x420 security/tomoyo/network.c:761
security_socket_sendmsg+0x75/0xb0 security/security.c:4501
__sock_sendmsg+0x49/0x270 net/socket.c:742
sock_write_iter+0x2dd/0x400 net/socket.c:1160
call_write_iter include/linux/fs.h:2108 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa84/0xcb0 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f2e91716bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffee57321e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000000000f4 RCX: 00007f2e91716bf2
RDX: 00000000000000f4 RSI: 000055731dc092b0 RDI: 0000000000000004
RBP: 000055731dbfe220 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000557315f9caa4
R13: 000000000000004b R14: 0000557315f9d3e8 R15: 00007ffee5732258
</TASK>

Allocated by task 5110:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
kmalloc_trace+0x1d9/0x360 mm/slub.c:4012
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:711 [inline]
bpf_raw_tp_link_attach+0x2a0/0x6e0 kernel/bpf/syscall.c:3816
bpf_raw_tracepoint_open+0x1c2/0x240 kernel/bpf/syscall.c:3863
__sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5673
__do_sys_bpf kernel/bpf/syscall.c:5738 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5736 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75

Freed by task 5110:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:589
poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4299 [inline]
kfree+0x14a/0x380 mm/slub.c:4409
bpf_link_release+0x3b/0x50 kernel/bpf/syscall.c:3071
__fput+0x429/0x8a0 fs/file_table.c:423
task_work_run+0x24f/0x310 kernel/task_work.c:180
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xa1b/0x27e0 kernel/exit.c:878
do_group_exit+0x207/0x2c0 kernel/exit.c:1027
__do_sys_exit_group kernel/exit.c:1038 [inline]
__se_sys_exit_group kernel/exit.c:1036 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75

The buggy address belongs to the object at ffff8880238ba900
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
freed 128-byte region [ffff8880238ba900, ffff8880238ba980)

The buggy address belongs to the physical page:
page:ffffea00008e2e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x238ba
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888014c418c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5108, tgid 5108 (syz-executor305), ts 75475805562, free_ts 75472097179
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
__alloc_pages+0x256/0x680 mm/page_alloc.c:4569
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2190
allocate_slab mm/slub.c:2354 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2407
___slab_alloc+0xd1b/0x13e0 mm/slub.c:3540
__slab_alloc mm/slub.c:3625 [inline]
__slab_alloc_node mm/slub.c:3678 [inline]
slab_alloc_node mm/slub.c:3850 [inline]
kmalloc_trace+0x267/0x360 mm/slub.c:4007
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:711 [inline]
bpf_raw_tp_link_attach+0x2a0/0x6e0 kernel/bpf/syscall.c:3816
bpf_raw_tracepoint_open+0x1c2/0x240 kernel/bpf/syscall.c:3863
__sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5673
__do_sys_bpf kernel/bpf/syscall.c:5738 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5736 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
page last free pid 5110 tgid 5110 stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1140 [inline]
free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346
free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
skb_free_frag include/linux/skbuff.h:3341 [inline]
skb_free_head net/core/skbuff.c:1106 [inline]
skb_release_data+0x640/0x870 net/core/skbuff.c:1136
skb_release_all net/core/skbuff.c:1202 [inline]
__kfree_skb+0x57/0x70 net/core/skbuff.c:1216
tcp_rcv_established+0x107e/0x1fd0 net/ipv4/tcp_input.c:6080
tcp_v4_do_rcv+0x8da/0xb90 net/ipv4/tcp_ipv4.c:1906
tcp_v4_rcv+0x2e59/0x3780 net/ipv4/tcp_ipv4.c:2332
ip_protocol_deliver_rcu+0x225/0x430 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x33f/0x5f0 net/ipv4/ip_input.c:233
NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
ip_local_deliver net/ipv4/ip_input.c:254 [inline]
dst_input include/net/dst.h:460 [inline]
ip_sublist_rcv_finish+0x3be/0x4f0 net/ipv4/ip_input.c:580
ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline]
ip_sublist_rcv+0x75d/0xab0 net/ipv4/ip_input.c:639
ip_list_rcv+0x42b/0x480 net/ipv4/ip_input.c:674
__netif_receive_skb_list_ptype net/core/dev.c:5581 [inline]
__netif_receive_skb_list_core+0x95a/0x980 net/core/dev.c:5629
__netif_receive_skb_list net/core/dev.c:5681 [inline]
netif_receive_skb_list_internal+0xa62/0xe70 net/core/dev.c:5773
gro_normal_list include/net/gro.h:438 [inline]
napi_complete_done+0x310/0x8e0 net/core/dev.c:6113

Memory state around the buggy address:
ffff8880238ba800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880238ba880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880238ba900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880238ba980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880238baa00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: f5 cmc
1: 4d 01 fb add %r15,%r11
4: 48 8d 5d 07 lea 0x7(%rbp),%rbx
8: 48 85 ed test %rbp,%rbp
b: 48 0f 49 dd cmovns %rbp,%rbx
f: 48 83 e3 f8 and $0xfffffffffffffff8,%rbx
13: 48 29 dd sub %rbx,%rbp
16: 74 12 je 0x2a
18: 41 80 3b 00 cmpb $0x0,(%r11)
1c: 0f 85 a6 00 00 00 jne 0xc8
22: 49 ff c3 inc %r11
25: 48 ff cd dec %rbp
28: 75 ee jne 0x18
* 2a: 5b pop %rbx <-- trapping instruction
2b: 41 5c pop %r12
2d: 41 5e pop %r14
2f: 41 5f pop %r15
31: 5d pop %rbp
32: c3 ret
33: cc int3
34: cc int3
35: cc int3
36: cc int3
37: 40 84 ed test %bpl,%bpl
3a: 75 5f jne 0x9b
3c: f7 .byte 0xf7
3d: c5 .byte 0xc5
3e: 00 ff add %bh,%bh

---
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If the report is already addressed, let syzbot know by replying with:
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Next message: Ingo Molnar: "Re: [PATCH 2/2] x86/bpf: Fix IP for relocating call depth accounting"
Previous message: syzbot: "[syzbot] [bpf?] [trace?] KASAN: slab-use-after-free Read in bpf_trace_run2"
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