BUG: stack guard page was hit in sys_chdir (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ab2d1d40a128 Revert "vsock: each transport cycles only on ..
git tree: android12-5.10-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=14548367700000
kernel config: https://syzkaller.appspot.com/x/.config?x=75791a4a1d0f0a62
dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17c6b2ab700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1379f6b9700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+990590...@syzkaller.appspotmail.com

BUG: stack guard page was hit at ffffc90000bafff8 (stack is ffffc90000bb0000..ffffc90000bb7fff)
kernel stack overflow (double-fault): 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 365 Comm: syz-executor864 Not tainted 5.10.108-syzkaller-00653-gab2d1d40a128 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__unwind_start+0x8/0x420 arch/x86/kernel/unwind_frame.c:365
Code: ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3f fe ff ff e8 ab e6 72 00 e9 35 fe ff ff e8 a1 01 62 03 90 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 83 ec 50 48 89 4d d0 49 89 d7 49 89 f6 49 89 fd
RSP: 0018:ffffc90000bb0000 EFLAGS: 00010246
RAX: ffff88811ceae2c0 RBX: 1ffff92000176022 RCX: ffffc90000bb00b0
RDX: 0000000000000000 RSI: ffff88811ceae2c0 RDI: ffffc90000bb0020
RBP: ffffc90000bb0010 R08: dffffc0000000000 R09: ffffc90000bb0100
R10: fffff52000176023 R11: 0000000000000000 R12: ffff88811ceae2c0
R13: ffffffff815bf690 R14: ffffc90000bb0100 R15: 0000000000000000
FS: 0000555557479300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000bafff8 CR3: 000000011ced8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
unwind_start arch/x86/include/asm/unwind.h:60 [inline]
arch_stack_walk+0xdc/0x140 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x11b/0x1e0 kernel/stacktrace.c:121
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:428 [inline]
__kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:583 [inline]
slab_alloc_node mm/slub.c:2956 [inline]
slab_alloc mm/slub.c:2964 [inline]
kmem_cache_alloc+0x1a2/0x380 mm/slub.c:2969
__d_alloc+0x2d/0x6b0 fs/dcache.c:1709
d_alloc fs/dcache.c:1788 [inline]
d_alloc_parallel+0xf3/0x1360 fs/dcache.c:2540
__lookup_slow+0x14e/0x400 fs/namei.c:1613
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_one_len+0x17f/0x2c0 fs/namei.c:2642
incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:211
dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967
__lookup_slow+0x2b3/0x400 fs/namei.c:1628
lookup_slow fs/namei.c:1645 [inline]
walk_component+0x516/0x790 fs/namei.c:1940
lookup_last fs/namei.c:2389 [inline]
path_lookupat+0x19d/0x6c0 fs/namei.c:2413
filename_lookup+0x23f/0x6c0 fs/namei.c:2446
user_path_at_empty+0x40/0x50 fs/namei.c:2726
user_path_at include/linux/namei.h:59 [inline]
__do_sys_chdir fs/open.c:492 [inline]
__se_sys_chdir+0x9c/0x230 fs/open.c:486
__x64_sys_chdir+0x38/0x40 fs/open.c:486
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fd005183069
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff21e315e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd005183069
RDX: 00007fd005183069 RSI: 0000000020000200 RDI: 0000000020000240
RBP: 00007fd005147050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd0051470e0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace db6f2442a3187b4d ]---
RIP: 0010:__unwind_start+0x8/0x420 arch/x86/kernel/unwind_frame.c:365
Code: ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3f fe ff ff e8 ab e6 72 00 e9 35 fe ff ff e8 a1 01 62 03 90 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 83 ec 50 48 89 4d d0 49 89 d7 49 89 f6 49 89 fd
RSP: 0018:ffffc90000bb0000 EFLAGS: 00010246
RAX: ffff88811ceae2c0 RBX: 1ffff92000176022 RCX: ffffc90000bb00b0
RDX: 0000000000000000 RSI: ffff88811ceae2c0 RDI: ffffc90000bb0020
RBP: ffffc90000bb0010 R08: dffffc0000000000 R09: ffffc90000bb0100
R10: fffff52000176023 R11: 0000000000000000 R12: ffff88811ceae2c0
R13: ffffffff815bf690 R14: ffffc90000bb0100 R15: 0000000000000000
FS: 0000555557479300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000bafff8 CR3: 000000011ced8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: ff 89 f9 80 e1 07 decl 0x7e180f9(%rcx)
6: 80 c1 03 add $0x3,%cl
9: 38 c1 cmp %al,%cl
b: 0f 8c 3f fe ff ff jl 0xfffffe50
11: e8 ab e6 72 00 callq 0x72e6c1
16: e9 35 fe ff ff jmpq 0xfffffe50
1b: e8 a1 01 62 03 callq 0x36201c1
20: 90 nop
21: 55 push %rbp
22: 48 89 e5 mov %rsp,%rbp
25: 41 57 push %r15
27: 41 56 push %r14
* 29: 41 55 push %r13 <-- trapping instruction
2b: 41 54 push %r12
2d: 53 push %rbx
2e: 48 83 ec 50 sub $0x50,%rsp
32: 48 89 4d d0 mov %rcx,-0x30(%rbp)
36: 49 89 d7 mov %rdx,%r15
39: 49 89 f6 mov %rsi,%r14
3c: 49 89 fd mov %rdi,%r13


---
This report is generated by a bot. It may contain errors.
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syzbot can test patches for this issue, for details see:
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[Tadeusz Struk]

#syz test: https://android.googlesource.com/kernel/common android13-5.10

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

ithin address ffffc9000019f1c0 with insufficient space
for an object of type 'struct sk_buff'
CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 5.10.107-syzkaller-00420-gec7c9ea9d496 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
dump_stack+0x15/0x1d lib/dump_stack.c:135
ubsan_epilogue lib/ubsan.c:148 [inline]
handle_object_size_mismatch lib/ubsan.c:297 [inline]
ubsan_type_mismatch_common+0x1ed/0x3a0 lib/ubsan.c:310
__ubsan_handle_type_mismatch_v1+0x5b/0x70 lib/ubsan.c:339
__skb_insert include/linux/skbuff.h:1932 [inline]
__skb_queue_before include/linux/skbuff.h:2039 [inline]
__skb_queue_tail include/linux/skbuff.h:2072 [inline]
wg_xmit+0x513/0xae0 drivers/net/wireguard/device.c:185
__netdev_start_xmit include/linux/netdevice.h:4831 [inline]
netdev_start_xmit+0x8a/0x160 include/linux/netdevice.h:4845
xmit_one net/core/dev.c:3591 [inline]
dev_hard_start_xmit+0x18d/0x2f0 net/core/dev.c:3607
__dev_queue_xmit+0x100c/0x1c30 net/core/dev.c:4173
dev_queue_xmit+0x17/0x20 net/core/dev.c:4206
neigh_connected_output+0x288/0x2b0 net/core/neighbour.c:1531
neigh_output include/net/neighbour.h:524 [inline]
ip6_finish_output2+0xde2/0x1440 net/ipv6/ip6_output.c:145
__ip6_finish_output+0x3e4/0x520 net/ipv6/ip6_output.c:210
ip6_finish_output+0x3f/0x220 net/ipv6/ip6_output.c:220
NF_HOOK_COND include/linux/netfilter.h:293 [inline]
ip6_output+0x1f8/0x4b0 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:443 [inline]
NF_HOOK+0xdd/0x280 include/linux/netfilter.h:304
ndisc_send_skb+0x646/0x9f0 net/ipv6/ndisc.c:508
ndisc_send_rs+0x26c/0x360 net/ipv6/ndisc.c:702
addrconf_dad_completed+0x4f3/0x9f0 net/ipv6/addrconf.c:4241
addrconf_dad_work+0x9c1/0x1520
process_one_work+0x3ca/0x660 kernel/workqueue.c:2298
worker_thread+0x709/0xa20 kernel/workqueue.c:2444
kthread+0x389/0x3c0 kernel/kthread.c:313
ret_from_fork+0x1f/0x30
================================================================================


Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts.
2022/03/28 23:24:58 fuzzer started
2022/03/28 23:24:59 connecting to host at 10.128.0.163:35421
2022/03/28 23:24:59 checking machine...
2022/03/28 23:24:59 checking revisions...
2022/03/28 23:24:59 testing simple program...
[ 23.281867][ T23] audit: type=1400 audit(1648509899.229:73): avc: denied { getattr } for pid=362 comm="syz-fuzzer" path="user:[4026531837]" dev="nsfs" ino=4026531837 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:nsfs_t tclass=file permissive=1
[ 23.300084][ T371] cgroup: Unknown subsys name 'net'
[ 23.305401][ T23] audit: type=1400 audit(1648509899.239:74): avc: denied { read } for pid=362 comm="syz-fuzzer" dev="nsfs" ino=4026531837 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:nsfs_t tclass=file permissive=1
[ 23.331657][ T23] audit: type=1400 audit(1648509899.239:75): avc: denied { open } for pid=362 comm="syz-fuzzer" path="user:[4026531837]" dev="nsfs" ino=4026531837 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:nsfs_t tclass=file permissive=1
[ 23.331824][ T371] cgroup: Unknown subsys name 'devices'
[ 23.355195][ T23] audit: type=1400 audit(1648509899.239:76): avc: denied { read } for pid=362 comm="syz-fuzzer" name="raw-gadget" dev="devtmpfs" ino=165 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1
[ 23.383884][ T23] audit: type=1400 audit(1648509899.239:77): avc: denied { open } for pid=362 comm="syz-fuzzer" path="/dev/raw-gadget" dev="devtmpfs" ino=165 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1
[ 23.407542][ T23] audit: type=1400 audit(1648509899.249:78): avc: denied { mounton } for pid=371 comm="syz-executor" path="/syzcgroup/unified" dev="sda1" ino=1136 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:root_t tclass=dir permissive=1
[ 23.430438][ T23] audit: type=1400 audit(1648509899.249:79): avc: denied { mount } for pid=371 comm="syz-executor" name="/" dev="cgroup2" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1
[ 23.452806][ T23] audit: type=1400 audit(1648509899.269:80): avc: denied { unmount } for pid=371 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1
[ 23.563603][ T371] cgroup: Unknown subsys name 'hugetlb'
[ 23.569777][ T371] cgroup: Unknown subsys name 'rlimit'
[ 23.633090][ T23] audit: type=1400 audit(1648509899.589:81): avc: denied { setattr } for pid=371 comm="syz-executor" name="raw-gadget" dev="devtmpfs" ino=165 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1
[ 23.667273][ T23] audit: type=1400 audit(1648509899.619:82): avc: denied { execmem } for pid=372 comm="syz-executor.0" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 23.721242][ T373] bridge0: port 1(bridge_slave_0) entered blocking state
[ 23.728409][ T373] bridge0: port 1(bridge_slave_0) entered disabled state
[ 23.736308][ T373] device bridge_slave_0 entered promiscuous mode
[ 23.743563][ T373] bridge0: port 2(bridge_slave_1) entered blocking state
[ 23.751036][ T373] bridge0: port 2(bridge_slave_1) entered disabled state
[ 23.758511][ T373] device bridge_slave_1 entered promiscuous mode
[ 23.788822][ T373] bridge0: port 2(bridge_slave_1) entered blocking state
[ 23.795977][ T373] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 23.803351][ T373] bridge0: port 1(bridge_slave_0) entered blocking state
[ 23.810544][ T373] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 23.829291][ T24] bridge0: port 1(bridge_slave_0) entered disabled state
[ 23.836599][ T24] bridge0: port 2(bridge_slave_1) entered disabled state
[ 23.844187][ T24] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[ 23.851659][ T24] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 23.861494][ T61] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 23.870114][ T61] bridge0: port 1(bridge_slave_0) entered blocking state
[ 23.877172][ T61] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 23.886594][ T24] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 23.894875][ T24] bridge0: port 2(bridge_slave_1) entered blocking state
[ 23.901897][ T24] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 23.922721][ T19] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready
[ 23.931067][ T19] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
[ 23.939670][ T19] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 23.947711][ T19] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[ 23.957895][ T61] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[ 23.969161][ T61] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[ 23.981005][ T24] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
[ 23.990020][ T24] ================================================================================
[ 23.999689][ T24] UBSAN: object-size-mismatch in ./include/linux/skbuff.h:2039:28
[ 24.007570][ T24] member access within address ffffc9000019f1c0 with insufficient space
[ 24.016367][ T24] for an object of type 'struct sk_buff'
[ 24.022099][ T24] CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 5.10.107-syzkaller-00420-gec7c9ea9d496 #0
[ 24.031879][ T24] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 24.042641][ T24] Workqueue: ipv6_addrconf addrconf_dad_work
[ 24.048604][ T24] Call Trace:
[ 24.052053][ T24] dump_stack_lvl+0x1e2/0x24b
[ 24.056708][ T24] ? show_regs_print_info+0x18/0x18
[ 24.061979][ T24] ? wg_allowedips_lookup_dst+0x190/0x190
[ 24.067687][ T24] dump_stack+0x15/0x1d
[ 24.071831][ T24] ubsan_type_mismatch_common+0x1ed/0x3a0
[ 24.077535][ T24] ? __sanitizer_cov_trace_switch+0x74/0x90
[ 24.083494][ T24] __ubsan_handle_type_mismatch_v1+0x5b/0x70
[ 24.089451][ T24] wg_xmit+0x4a2/0xae0
[ 24.093522][ T24] ? wg_stop+0x5d0/0x5d0
[ 24.097938][ T24] ? __sanitizer_cov_trace_const_cmp2+0x19/0x20
[ 24.104424][ T24] netdev_start_xmit+0x8a/0x160
[ 24.109346][ T24] dev_hard_start_xmit+0x18d/0x2f0
[ 24.114520][ T24] __dev_queue_xmit+0x100c/0x1c30
[ 24.119633][ T24] ? dev_queue_xmit+0x20/0x20
[ 24.124303][ T24] ? __sanitizer_cov_trace_const_cmp4+0x19/0x20
[ 24.130541][ T24] ? ndisc_constructor+0x690/0x8a0
[ 24.135812][ T24] ? _raw_write_unlock_bh+0x31/0x47
[ 24.141010][ T24] ? ___neigh_create+0x162d/0x1ab0
[ 24.146276][ T24] ? dev_hard_header+0xdb/0xf0
[ 24.151041][ T24] dev_queue_xmit+0x17/0x20
[ 24.155535][ T24] neigh_connected_output+0x288/0x2b0
[ 24.160900][ T24] ip6_finish_output2+0xde2/0x1440
[ 24.166003][ T24] ? __rcu_read_lock+0x50/0x50
[ 24.170779][ T24] ? __ip6_finish_output+0x520/0x520
[ 24.176053][ T24] ? dst_cow_metrics_generic+0x55/0x1d0
[ 24.181577][ T24] ? __sanitizer_cov_trace_const_cmp4+0x19/0x20
[ 24.187992][ T24] ? ip6_skb_dst_mtu+0xaf/0x260
[ 24.192863][ T24] __ip6_finish_output+0x3e4/0x520
[ 24.197964][ T24] ip6_finish_output+0x3f/0x220
[ 24.202924][ T24] ? ip6_output+0x1d3/0x4b0
[ 24.207422][ T24] ip6_output+0x1f8/0x4b0
[ 24.211742][ T24] ? asan.module_dtor+0x20/0x20
[ 24.216748][ T24] ? skb_dst+0x40/0x40
[ 24.220890][ T24] ? __rcu_read_lock+0x50/0x50
[ 24.225811][ T24] ? selinux_ipv6_forward+0x50/0x50
[ 24.230990][ T24] ? __sanitizer_cov_trace_cmp8+0x18/0x20
[ 24.236829][ T24] ? nf_hook_slow+0x150/0x1b0
[ 24.241480][ T24] NF_HOOK+0xdd/0x280
[ 24.245440][ T24] ? addrconf_addr_solict_mult+0xe0/0xe0
[ 24.251049][ T24] ? NF_HOOK+0x280/0x280
[ 24.255272][ T24] ? __rcu_read_lock+0x50/0x50
[ 24.260017][ T24] ? __sanitizer_cov_trace_const_cmp4+0x19/0x20
[ 24.266603][ T24] ? ndisc_send_skb+0x547/0x9f0
[ 24.271435][ T24] ? memcpy+0x56/0x70
[ 24.275488][ T24] ndisc_send_skb+0x646/0x9f0
[ 24.280145][ T24] ? slab_post_alloc_hook+0x90/0xa0
[ 24.285412][ T24] ? ndisc_fill_addr_option+0x2f0/0x2f0
[ 24.291109][ T24] ? skb_set_owner_w+0x1a8/0x310
[ 24.296032][ T24] ? __sanitizer_cov_trace_cmp4+0x19/0x20
[ 24.301734][ T24] ? skb_put+0x11d/0x210
[ 24.305983][ T24] ndisc_send_rs+0x26c/0x360
[ 24.310646][ T24] addrconf_dad_completed+0x4f3/0x9f0
[ 24.315996][ T24] ? addrconf_dad_stop+0x430/0x430
[ 24.321893][ T24] ? mutex_unlock+0x34/0x40
[ 24.326387][ T24] addrconf_dad_work+0x9c1/0x1520
[ 24.331482][ T24] ? move_linked_works+0x118/0x130
[ 24.336593][ T24] ? ipv6_use_optimistic_addr+0x1d0/0x1d0
[ 24.342460][ T24] ? __kasan_check_write+0x14/0x20
[ 24.347548][ T24] process_one_work+0x3ca/0x660
[ 24.352382][ T24] worker_thread+0x709/0xa20
[ 24.357048][ T24] ? __kthread_parkme+0x11b/0x150
[ 24.362091][ T24] kthread+0x389/0x3c0
[ 24.366137][ T24] ? pr_cont_work+0x110/0x110
[ 24.370790][ T24] ? __list_add+0xc0/0xc0
[ 24.375185][ T24] ret_from_fork+0x1f/0x30
[ 24.379716][ T24] ================================================================================
[ 24.389198][ T24] ================================================================================
[ 24.398975][ T24] UBSAN: object-size-mismatch in ./include/linux/skbuff.h:1932:2
[ 24.406711][ T24] member access within address ffffc9000019f1c0 with insufficient space
[ 24.415152][ T24] for an object of type 'struct sk_buff'
[ 24.420792][ T24] CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 5.10.107-syzkaller-00420-gec7c9ea9d496 #0
[ 24.430570][ T24] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 24.440615][ T24] Workqueue: ipv6_addrconf addrconf_dad_work
[ 24.446580][ T24] Call Trace:
[ 24.449846][ T24] dump_stack_lvl+0x1e2/0x24b
[ 24.454510][ T24] ? show_regs_print_info+0x18/0x18
[ 24.459686][ T24] ? wg_allowedips_lookup_dst+0x190/0x190
[ 24.465384][ T24] dump_stack+0x15/0x1d
[ 24.469613][ T24] ubsan_type_mismatch_common+0x1ed/0x3a0
[ 24.475399][ T24] __ubsan_handle_type_mismatch_v1+0x5b/0x70
[ 24.481645][ T24] wg_xmit+0x513/0xae0
[ 24.485698][ T24] ? wg_stop+0x5d0/0x5d0
[ 24.489916][ T24] ? __sanitizer_cov_trace_const_cmp2+0x19/0x20
[ 24.496134][ T24] netdev_start_xmit+0x8a/0x160
[ 24.501087][ T24] dev_hard_start_xmit+0x18d/0x2f0
[ 24.506327][ T24] __dev_queue_xmit+0x100c/0x1c30
[ 24.511380][ T24] ? dev_queue_xmit+0x20/0x20
[ 24.516060][ T24] ? __sanitizer_cov_trace_const_cmp4+0x19/0x20
[ 24.522729][ T24] ? ndisc_constructor+0x690/0x8a0
[ 24.527839][ T24] ? _raw_write_unlock_bh+0x31/0x47
[ 24.533022][ T24] ? ___neigh_create+0x162d/0x1ab0
[ 24.538310][ T24] ? dev_hard_header+0xdb/0xf0
[ 24.543067][ T24] dev_queue_xmit+0x17/0x20
[ 24.547678][ T24] neigh_connected_output+0x288/0x2b0
[ 24.553116][ T24] ip6_finish_output2+0xde2/0x1440
[ 24.558300][ T24] ? __rcu_read_lock+0x50/0x50
[ 24.563060][ T24] ? __ip6_finish_output+0x520/0x520
[ 24.568406][ T24] ? dst_cow_metrics_generic+0x55/0x1d0
[ 24.573936][ T24] ? __sanitizer_cov_trace_const_cmp4+0x19/0x20
[ 24.580760][ T24] ? ip6_skb_dst_mtu+0xaf/0x260
[ 24.585614][ T24] __ip6_finish_output+0x3e4/0x520
[ 24.590740][ T24] ip6_finish_output+0x3f/0x220
[ 24.595576][ T24] ? ip6_output+0x1d3/0x4b0
[ 24.600070][ T24] ip6_output+0x1f8/0x4b0
[ 24.604486][ T24] ? asan.module_dtor+0x20/0x20
[ 24.609495][ T24] ? skb_dst+0x40/0x40
[ 24.613539][ T24] ? __rcu_read_lock+0x50/0x50
[ 24.618366][ T24] ? selinux_ipv6_forward+0x50/0x50
[ 24.623561][ T24] ? __sanitizer_cov_trace_cmp8+0x18/0x20
[ 24.629440][ T24] ? nf_hook_slow+0x150/0x1b0
[ 24.634169][ T24] NF_HOOK+0xdd/0x280
[ 24.638154][ T24] ? addrconf_addr_solict_mult+0xe0/0xe0
[ 24.643985][ T24] ? NF_HOOK+0x280/0x280
[ 24.648215][ T24] ? __rcu_read_lock+0x50/0x50
[ 24.653089][ T24] ? __sanitizer_cov_trace_const_cmp4+0x19/0x20
[ 24.659421][ T24] ? ndisc_send_skb+0x547/0x9f0
[ 24.664457][ T24] ? memcpy+0x56/0x70
[ 24.668422][ T24] ndisc_send_skb+0x646/0x9f0
[ 24.674956][ T24] ? slab_post_alloc_hook+0x90/0xa0
[ 24.680259][ T24] ? ndisc_fill_addr_option+0x2f0/0x2f0
[ 24.685824][ T24] ? skb_set_owner_w+0x1a8/0x310
[ 24.690773][ T24] ? __sanitizer_cov_trace_cmp4+0x19/0x20
[ 24.697006][ T24] ? skb_put+0x11d/0x210
[ 24.701429][ T24] ndisc_send_rs+0x26c/0x360
[ 24.706117][ T24] addrconf_dad_completed+0x4f3/0x9f0
[ 24.711481][ T24] ? addrconf_dad_stop+0x430/0x430
[ 24.717027][ T24] ? mutex_unlock+0x34/0x40
[ 24.721862][ T24] addrconf_dad_work+0x9c1/0x1520
[ 24.726915][ T24] ? move_linked_works+0x118/0x130
[ 24.732108][ T24] ? ipv6_use_optimistic_addr+0x1d0/0x1d0
[ 24.738056][ T24] ? __kasan_check_write+0x14/0x20
[ 24.743243][ T24] process_one_work+0x3ca/0x660
[ 24.748087][ T24] worker_thread+0x709/0xa20
[ 24.752664][ T24] ? __kthread_parkme+0x11b/0x150
[ 24.757679][ T24] kthread+0x389/0x3c0
[ 24.762222][ T24] ? pr_cont_work+0x110/0x110
[ 24.766929][ T24] ? __list_add+0xc0/0xc0
[ 24.771245][ T24] ret_from_fork+0x1f/0x30
[ 24.775719][ T24] ================================================================================
2022/03/28 23:25:00 building call list...
[ 24.794059][ T373] cgroup: cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation
[ 25.296216][ T9] device bridge_slave_1 left promiscuous mode
[ 25.302420][ T9] bridge0: port 2(bridge_slave_1) entered disabled state
[ 25.310033][ T9] device bridge_slave_0 left promiscuous mode
[ 25.316671][ T9] bridge0: port 1(bridge_slave_0) entered disabled state


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=12b3aac3700000


Tested on:

commit: ec7c9ea9 ANDROID: Update the ABI representation
git tree: https://android.googlesource.com/kernel/common android13-5.10
kernel config: https://syzkaller.appspot.com/x/.config?x=c49accf4224b02fa

dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.

[Tadeusz Struk]

On 3/27/22 20:39, syzbot wrote:

#syz test: https://android.googlesource.com/kernel/common android13-5.10

=============================================
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3a02503b3637..76cc25bc140d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -291,9 +291,11 @@ struct tc_skb_ext {
#endif

struct sk_buff_head {
+ struct_group_tagged(sk_buff_list, list,
/* These two members must be first. */
struct sk_buff *next;
struct sk_buff *prev;
+ );

__u32 qlen;
spinlock_t lock;
@@ -1929,8 +1931,8 @@ static inline void __skb_insert(struct sk_buff *newsk,
*/
WRITE_ONCE(newsk->next, next);
WRITE_ONCE(newsk->prev, prev);
- WRITE_ONCE(next->prev, newsk);
- WRITE_ONCE(prev->next, newsk);
+ WRITE_ONCE(((struct sk_buff_list *)next)->prev, newsk);
+ WRITE_ONCE(((struct sk_buff_list *)prev)->next, newsk);
WRITE_ONCE(list->qlen, list->qlen + 1);
}

@@ -2026,7 +2028,7 @@ static inline void __skb_queue_after(struct sk_buff_head
*list,
struct sk_buff *prev,
struct sk_buff *newsk)
{
- __skb_insert(newsk, prev, prev->next, list);
+ __skb_insert(newsk, prev, ((struct sk_buff_list *)prev)->next, list);
}

void skb_append(struct sk_buff *old, struct sk_buff *newsk,
@@ -2036,7 +2038,7 @@ static inline void __skb_queue_before(struct sk_buff_head
*list,
struct sk_buff *next,
struct sk_buff *newsk)
{
- __skb_insert(newsk, next->prev, next, list);
+ __skb_insert(newsk, ((struct sk_buff_list *)next)->prev, next, list);
}

/**
diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index 998a4ba28eba..938216f8ab7e 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -36,4 +36,52 @@ enum {
#define offsetofend(TYPE, MEMBER) \
(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))

+/**
+ * struct_group() - Wrap a set of declarations in a mirrored struct
+ *
+ * @NAME: The identifier name of the mirrored sub-struct
+ * @MEMBERS: The member declarations for the mirrored structs
+ *
+ * Used to create an anonymous union of two structs with identical
+ * layout and size: one anonymous and one named. The former can be
+ * used normally without sub-struct naming, and the latter can be
+ * used to reason about the start, end, and size of the group of
+ * struct members.
+ */
+#define struct_group(NAME, MEMBERS...) \
+ __struct_group(/* no tag */, NAME, /* no attrs */, MEMBERS)
+
+/**
+ * struct_group_attr() - Create a struct_group() with trailing attributes
+ *
+ * @NAME: The identifier name of the mirrored sub-struct
+ * @ATTRS: Any struct attributes to apply
+ * @MEMBERS: The member declarations for the mirrored structs
+ *
+ * Used to create an anonymous union of two structs with identical
+ * layout and size: one anonymous and one named. The former can be
+ * used normally without sub-struct naming, and the latter can be
+ * used to reason about the start, end, and size of the group of
+ * struct members. Includes structure attributes argument.
+ */
+#define struct_group_attr(NAME, ATTRS, MEMBERS...) \
+ __struct_group(/* no tag */, NAME, ATTRS, MEMBERS)
+
+/**
+ * struct_group_tagged() - Create a struct_group with a reusable tag
+ *
+ * @TAG: The tag name for the named sub-struct
+ * @NAME: The identifier name of the mirrored sub-struct
+ * @MEMBERS: The member declarations for the mirrored structs
+ *
+ * Used to create an anonymous union of two structs with identical
+ * layout and size: one anonymous and one named. The former can be
+ * used normally without sub-struct naming, and the latter can be
+ * used to reason about the start, end, and size of the group of
+ * struct members. Includes struct tag argument for the named copy,
+ * so the specified layout can be reused later.
+ */
+#define struct_group_tagged(TAG, NAME, MEMBERS...) \
+ __struct_group(TAG, NAME, /* no attrs */, MEMBERS)
+
#endif
diff --git a/include/uapi/linux/stddef.h b/include/uapi/linux/stddef.h
index ee8220f8dcf5..22aa0e2177ea 100644
--- a/include/uapi/linux/stddef.h
+++ b/include/uapi/linux/stddef.h
@@ -4,3 +4,41 @@
#ifndef __always_inline
#define __always_inline inline
#endif
+
+/**
+ * __struct_group() - Create a mirrored named and anonyomous struct
+ *
+ * @TAG: The tag name for the named sub-struct (usually empty)
+ * @NAME: The identifier name of the mirrored sub-struct
+ * @ATTRS: Any struct attributes (usually empty)
+ * @MEMBERS: The member declarations for the mirrored structs
+ *
+ * Used to create an anonymous union of two structs with identical layout
+ * and size: one anonymous and one named. The former's members can be used
+ * normally without sub-struct naming, and the latter can be used to
+ * reason about the start, end, and size of the group of struct members.
+ * The named struct can also be explicitly tagged for layer reuse, as well
+ * as both having struct attributes appended.
+ */
+#define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
+ union { \
+ struct { MEMBERS } ATTRS; \
+ struct TAG { MEMBERS } ATTRS NAME; \
+ }
+
+/**
+ * __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
+ *
+ * @TYPE: The type of each flexible array element
+ * @NAME: The name of the flexible array member
+ *
+ * In order to have a flexible array member in a union or alone in a
+ * struct, it needs to be wrapped in an anonymous struct with at least 1
+ * named member, but that member can be empty.
+ */
+#define __DECLARE_FLEX_ARRAY(TYPE, NAME) \
+ struct { \
+ struct { } __empty_ ## NAME; \
+ TYPE NAME[]; \
+ }
+

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file include/linux/skbuff.h
patch: **** malformed patch at line 7: diff --git a/include/linux/stddef.h b/include/linux/stddef.h




Tested on:

commit: a75cb9df ANDROID: KVM: arm64: Drop FOLL_FORCE when pin..

git tree: https://android.googlesource.com/kernel/common android13-5.10

dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
compiler:

patch: https://syzkaller.appspot.com/x/patch.diff?x=17e37277700000

[Tadeusz Struk]

On 3/27/22 20:39, syzbot wrote:

#syz test: https://android.googlesource.com/kernel/common android13-5.10

=======================================

=======================================

=======================================

[Tadeusz Struk]

On 3/27/22 20:39, syzbot wrote:

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: ab2d1d40a128 Revert "vsock: each transport cycles only on ..
> git tree: android12-5.10-lts
> console output: https://syzkaller.appspot.com/x/log.txt?x=14548367700000
> kernel config: https://syzkaller.appspot.com/x/.config?x=75791a4a1d0f0a62
> dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
> compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17c6b2ab700000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1379f6b9700000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+990590...@syzkaller.appspotmail.com

diff --git a/include/linux/stddef.h b/include/linux/stddef.h

diff --git a/include/uapi/linux/stddef.h b/include/uapi/linux/stddef.h

--
2.35.1


--
Thanks,
Tadeusz

[Tadeusz Struk]

On 3/27/22 20:39, syzbot wrote:

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file include/linux/skbuff.h

patch: **** malformed patch at line 6: diff --git a/include/linux/stddef.h b/include/linux/stddef.h

Tested on:

commit: a75cb9df ANDROID: KVM: arm64: Drop FOLL_FORCE when pin..
git tree: https://android.googlesource.com/kernel/common android13-5.10

dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
compiler:

patch: https://syzkaller.appspot.com/x/patch.diff?x=163d0f2b700000

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file include/linux/skbuff.h

patch: **** malformed patch at line 6: index 998a4ba28eba..938216f8ab7e 100644

Tested on:

commit: a75cb9df ANDROID: KVM: arm64: Drop FOLL_FORCE when pin..
git tree: https://android.googlesource.com/kernel/common android13-5.10

dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
compiler:

patch: https://syzkaller.appspot.com/x/patch.diff?x=13dc7e3b700000

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file include/linux/skbuff.h
patch: **** malformed patch at line 6: index 998a4ba28eba..938216f8ab7e 100644




Tested on:

commit: a75cb9df ANDROID: KVM: arm64: Drop FOLL_FORCE when pin..
git tree: https://android.googlesource.com/kernel/common android13-5.10

dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
compiler:

patch: https://syzkaller.appspot.com/x/patch.diff?x=115e1f25700000

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+990590...@syzkaller.appspotmail.com

Tested on:

commit: a75cb9df ANDROID: KVM: arm64: Drop FOLL_FORCE when pin..
git tree: https://android.googlesource.com/kernel/common android13-5.10

kernel config: https://syzkaller.appspot.com/x/.config?x=c49accf4224b02fa
dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f

compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=15c840bb700000

Note: testing is done by a robot and is best-effort only.

[Tadeusz Struk]

On 3/27/22 20:39, syzbot wrote:

#syz dup: BUG: stack guard page was hit in file_open

--
Thanks,
Tadeusz

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+990590...@syzkaller.appspotmail.com

Tested on:

commit: 3f9db3f7 ANDROID: sched: Add vendor hook for rt util u..

git tree: https://android.googlesource.com/kernel/common android13-5.10
kernel config: https://syzkaller.appspot.com/x/.config?x=c49accf4224b02fa

dashboard link: https://syzkaller.appspot.com/bug?extid=99059043eeb0ac1e327f
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=153fcb4f700000