Re: [syzbot] [bpf?] [net?] general protection fault in __xsk_map_flush

From: syzbot
Date: Mon Jul 22 2024 - 12:46:15 EST

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In reply to: syzbot: "Re: [syzbot] [bpf?] [net?] general protection fault in __xsk_map_flush"
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-out-of-bounds Read in bq_xmit_all

==================================================================
BUG: KASAN: slab-out-of-bounds in bq_xmit_all+0x134/0x11d0 kernel/bpf/devmap.c:385
Read of size 8 at addr ffff88807a2f03a0 by task syz.0.305/6537

CPU: 0 UID: 0 PID: 6537 Comm: syz.0.305 Not tainted 6.10.0-syzkaller-11840-g933069701c1b-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
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
bq_xmit_all+0x134/0x11d0 kernel/bpf/devmap.c:385
__dev_flush+0x81/0x160 kernel/bpf/devmap.c:425
xdp_do_check_flushed+0x129/0x240 net/core/filter.c:4300
__napi_poll+0xe4/0x490 net/core/dev.c:6774
napi_poll net/core/dev.c:6840 [inline]
net_rx_action+0x89b/0x1240 net/core/dev.c:6962
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
common_interrupt+0xaa/0xd0 arch/x86/kernel/irq.c:278
</IRQ>
<TASK>
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:__sanitizer_cov_trace_switch+0x110/0x120 kernel/kcov.c:342
Code: 43 28 4c 39 f8 77 a3 49 ff c4 4c 89 21 4c 89 44 0b 08 4c 89 74 0b 10 48 89 7c 0b 18 4c 89 4c 0b 20 eb 87 5b 41 5c 41 5e 41 5f <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90002de6ec0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff88801cb4da00
RDX: 0000000000000003 RSI: ffffffff8e1a32f0 RDI: 0000000000000002
RBP: ffffffff9033a231 R08: 0000000000000005 R09: ffffffff81411746
R10: 0000000000000003 R11: ffff88801cb4da00 R12: ffffffff9033a230
R13: dffffc0000000000 R14: ffffc90002de6ff0 R15: 1ffff920005bcdf4
unwind_next_frame+0xff6/0x2a00 arch/x86/kernel/unwind_orc.c:581
arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
save_stack+0xfb/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x75/0x3f0 mm/page_owner.c:297
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1094 [inline]
free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2656
folios_put_refs+0x76e/0x860 mm/swap.c:1039
free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335
__tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373
tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465
exit_mmap+0x44f/0xc80 mm/mmap.c:3395
__mmput+0x115/0x390 kernel/fork.c:1345
exit_mm+0x220/0x310 kernel/exit.c:571
do_exit+0x9b2/0x27f0 kernel/exit.c:869
do_group_exit+0x207/0x2c0 kernel/exit.c:1031
get_signal+0x16a1/0x1740 kernel/signal.c:2917
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf1cf75bd9
Code: Unable to access opcode bytes at 0x7faf1cf75baf.
RSP: 002b:00007faf1dd780f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007faf1d103f68 RCX: 00007faf1cf75bd9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007faf1d103f68
RBP: 00007faf1d103f60 R08: 00007faf1dd786c0 R09: 00007faf1dd786c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007faf1d103f6c
R13: 000000000000000b R14: 00007fff7453a500 R15: 00007fff7453a5e8
</TASK>

Allocated by task 5658:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:312 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3988 [inline]
slab_alloc_node mm/slub.c:4037 [inline]
kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044
vm_area_dup+0x27/0x290 kernel/fork.c:486
dup_mmap kernel/fork.c:695 [inline]
dup_mm kernel/fork.c:1672 [inline]
copy_mm+0xc7b/0x1f30 kernel/fork.c:1721
copy_process+0x187a/0x3dc0 kernel/fork.c:2374
kernel_clone+0x226/0x8f0 kernel/fork.c:2781
__do_sys_clone kernel/fork.c:2924 [inline]
__se_sys_clone kernel/fork.c:2908 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2908
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88807a2f02e8
which belongs to the cache vm_area_struct of size 184
The buggy address is located 0 bytes to the right of
allocated 184-byte region [ffff88807a2f02e8, ffff88807a2f03a0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a2f0
memcg:ffff88802c3dca01
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000000 ffff888015eefb40 ffffea0001e7a400 0000000000000009
raw: 0000000000000000 0000000000100010 00000001fdffffff ffff88802c3dca01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5933, tgid 5933 (dhcpcd-run-hook), ts 112186336296, free_ts 112182429345
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
prep_new_page mm/page_alloc.c:1501 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3438
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x5f/0x120 mm/slub.c:2321
allocate_slab+0x5a/0x2f0 mm/slub.c:2484
new_slab mm/slub.c:2537 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723
__slab_alloc+0x58/0xa0 mm/slub.c:3813
__slab_alloc_node mm/slub.c:3866 [inline]
slab_alloc_node mm/slub.c:4025 [inline]
kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4044
vm_area_dup+0x27/0x290 kernel/fork.c:486
dup_mmap kernel/fork.c:695 [inline]
dup_mm kernel/fork.c:1672 [inline]
copy_mm+0xc7b/0x1f30 kernel/fork.c:1721
copy_process+0x187a/0x3dc0 kernel/fork.c:2374
kernel_clone+0x226/0x8f0 kernel/fork.c:2781
__do_sys_clone kernel/fork.c:2924 [inline]
__se_sys_clone kernel/fork.c:2908 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2908
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5935 tgid 5935 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1094 [inline]
free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2656
folios_put_refs+0x76e/0x860 mm/swap.c:1039
free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335
__tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373
tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465
exit_mmap+0x44f/0xc80 mm/mmap.c:3395
__mmput+0x115/0x390 kernel/fork.c:1345
exit_mm+0x220/0x310 kernel/exit.c:571
do_exit+0x9b2/0x27f0 kernel/exit.c:869
do_group_exit+0x207/0x2c0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
ffff88807a2f0280: 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00
ffff88807a2f0300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807a2f0380: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
^
ffff88807a2f0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807a2f0480: 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 43 28 4c 39 f8 sub %cl,-0x8(%r9,%r15,1)
5: 77 a3 ja 0xffffffaa
7: 49 ff c4 inc %r12
a: 4c 89 21 mov %r12,(%rcx)
d: 4c 89 44 0b 08 mov %r8,0x8(%rbx,%rcx,1)
12: 4c 89 74 0b 10 mov %r14,0x10(%rbx,%rcx,1)
17: 48 89 7c 0b 18 mov %rdi,0x18(%rbx,%rcx,1)
1c: 4c 89 4c 0b 20 mov %r9,0x20(%rbx,%rcx,1)
21: eb 87 jmp 0xffffffaa
23: 5b pop %rbx
24: 41 5c pop %r12
26: 41 5e pop %r14
28: 41 5f pop %r15
* 2a: c3 ret <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
36: 00 00 00
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop

Tested on:

commit: 93306970 Merge tag '6.11-rc-smb3-server-fixes' of git:..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12f902b1980000
kernel config: https://syzkaller.appspot.com/x/.config?x=d04f9888ed34da73
dashboard link: https://syzkaller.appspot.com/bug?extid=61a1cfc2b6632363d319
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=11da7f49980000

Next message: Benjamin Tissoires: "Re: [PATCH v1] hid-playstation: DS4: Update rumble and lightbar together"
Previous message: Liang, Kan: "Re: [PATCH v2 3/6] perf pmu: Add support for event.cpus files in sysfs"
In reply to: syzbot: "Re: [syzbot] [bpf?] [net?] general protection fault in __xsk_map_flush"
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