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

From: syzbot
Date: Mon Jul 22 2024 - 10:32:14 EST

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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 ffff88807a1c2d50 by task syz.0.283/6567

CPU: 0 UID: 0 PID: 6567 Comm: syz.0.283 Not tainted 6.10.0-syzkaller-11840-g933069701c1b #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
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x5d/0x70 kernel/kcov.c:225
Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90
RSP: 0018:ffffc90003ddf398 EFLAGS: 00000293
RAX: ffffffff81d0022b RBX: dffffc0000000000 RCX: ffff888026fe8000
RDX: 0000000000000000 RSI: 000000000000000f RDI: 000000000000001f
RBP: ffffc90003ddf4b0 R08: ffffffff81d001ee R09: 1ffffd40003c2f6e
R10: dffffc0000000000 R11: fffff940003c2f6f R12: ffffc90003ddf5a0
R13: ffffea0001e17b80 R14: ffffc90003ddf520 R15: 000000000000000f
folios_put_refs+0x19b/0x860 mm/swap.c:994
free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332
__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: 0033:0x7f1635175bd9
Code: Unable to access opcode bytes at 0x7f1635175baf.
RSP: 002b:00007f1635e770f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1635303f68 RCX: 00007f1635175bd9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1635303f68
RBP: 00007f1635303f60 R08: 00007f1635e776c0 R09: 00007f1635e776c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1635303f6c
R13: 000000000000000b R14: 00007ffeb68d9450 R15: 00007ffeb68d9538
</TASK>

Allocated by task 5754:
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 ffff88807a1c2c98
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 [ffff88807a1c2c98, ffff88807a1c2d50)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a1c2
memcg:ffff8880227b2101
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000000 ffff888015eefb40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000001fdffffff ffff8880227b2101
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 5972, tgid 5972 (dhcpcd-run-hook), ts 122017798005, free_ts 121858197708
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 5966 tgid 5966 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1094 [inline]
free_unref_page+0xd22/0xea0 mm/page_alloc.c:2608
discard_slab mm/slub.c:2583 [inline]
__put_partials+0xeb/0x130 mm/slub.c:3051
put_cpu_partial+0x17c/0x250 mm/slub.c:3126
__slab_free+0x2ea/0x3d0 mm/slub.c:4343
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
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]
__do_kmalloc_node mm/slub.c:4157 [inline]
__kmalloc_noprof+0x1a6/0x400 mm/slub.c:4170
kmalloc_noprof include/linux/slab.h:685 [inline]
tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822
security_inode_getattr+0xd8/0x130 security/security.c:2269
vfs_getattr+0x45/0x430 fs/stat.c:204
vfs_fstat fs/stat.c:229 [inline]
vfs_fstatat+0xe4/0x190 fs/stat.c:338
__do_sys_newfstatat fs/stat.c:505 [inline]
__se_sys_newfstatat fs/stat.c:499 [inline]
__x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:499
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:
ffff88807a1c2c00: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
ffff88807a1c2c80: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807a1c2d00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
^
ffff88807a1c2d80: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807a1c2e00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: f8 clc
1: 15 00 00 83 fa adc $0xfa830000,%eax
6: 02 75 21 add 0x21(%rbp),%dh
9: 48 8b 91 00 16 00 00 mov 0x1600(%rcx),%rdx
10: 48 8b 32 mov (%rdx),%rsi
13: 48 8d 7e 01 lea 0x1(%rsi),%rdi
17: 8b 89 fc 15 00 00 mov 0x15fc(%rcx),%ecx
1d: 48 39 cf cmp %rcx,%rdi
20: 73 08 jae 0x2a
22: 48 89 3a mov %rdi,(%rdx)
25: 48 89 44 f2 08 mov %rax,0x8(%rdx,%rsi,8)
* 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: 0f 1f 40 00 nopl 0x0(%rax)
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=130810c9980000
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

Note: no patches were applied.

Next message: Laurent Pinchart: "Re: [PATCH v5 01/14] media: starfive: Add JH7110 ISP module definitions"
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Next in thread: syzbot: "Re: [syzbot] [bpf?] [net?] general protection fault in __xsk_map_flush"
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