syzbot

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BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
Write of size 32 at addr ffff88801d275850 by task syz.3.992/7013

CPU: 0 PID: 7013 Comm: syz.3.992 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xac/0x220 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x288/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
 ____bpf_get_stackid_raw_tp kernel/trace/bpf_trace.c:1892 [inline]
 bpf_get_stackid_raw_tp+0x196/0x200 kernel/trace/bpf_trace.c:1881
 bpf_prog_e95a4a16f042d2d7+0x29/0x2d
 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
 __bpf_prog_run include/linux/filter.h:605 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
 bpf_trace_run10+0x3a2/0x450 kernel/trace/bpf_trace.c:2369
 __bpf_trace_percpu_alloc_percpu+0x365/0x3f0 include/trace/events/percpu.h:11
 trace_percpu_alloc_percpu include/trace/events/percpu.h:11 [inline]
 pcpu_alloc+0x1747/0x18d0 mm/percpu.c:1880
 bpf_prog_alloc_no_stats+0x109/0x440 kernel/bpf/core.c:107
 bpf_prog_alloc+0x3d/0x1b0 kernel/bpf/core.c:136
 bpf_prog_load+0x6b8/0x16d0 kernel/bpf/syscall.c:2675
 __sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5467
 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa4c1f8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc9a336538 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa4c21b5fa0 RCX: 00007fa4c1f8ebe9
RDX: 0000000000000094 RSI: 0000200000000680 RDI: 0000000000000005
RBP: 00007fa4c2011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa4c21b5fa0 R14: 00007fa4c21b5fa0 R15: 0000000000000003
 </TASK>

Allocated by task 7014:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc_node+0xb4/0x230 mm/slab_common.c:1014
 kmalloc_node include/linux/slab.h:620 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:301 [inline]
 bpf_map_area_alloc+0x5e/0x110 kernel/bpf/syscall.c:314
 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x33a/0x4c0 kernel/bpf/stackmap.c:114
 map_create+0x877/0x1110 kernel/bpf/syscall.c:1245
 __sys_bpf+0x5f0/0x800 kernel/bpf/syscall.c:5449
 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88801d275840
 which belongs to the cache kmalloc-cg-32 of size 32
The buggy address is located 16 bytes inside of
 allocated 24-byte region [ffff88801d275840, ffff88801d275858)

The buggy address belongs to the physical page:
page:ffffea0000749d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d275
memcg:ffff88805eb25801
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff88801784d8c0 ffffea000069a900 0000000000000004
raw: 0000000000000000 0000000080400040 00000001ffffffff ffff88805eb25801
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 25, tgid 25 (kdevtmpfs), ts 2331276322, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 alloc_slab_page+0x5d/0x170 mm/slub.c:1876
 allocate_slab mm/slub.c:2023 [inline]
 new_slab+0x87/0x2e0 mm/slub.c:2076
 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
 __slab_alloc mm/slub.c:3329 [inline]
 __slab_alloc_node mm/slub.c:3382 [inline]
 slab_alloc_node mm/slub.c:3475 [inline]
 __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524
 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 legacy_init_fs_context+0x51/0xc0 fs/fs_context.c:704
 alloc_fs_context+0x64b/0x7c0 fs/fs_context.c:318
 do_new_mount+0x10f/0xa40 fs/namespace.c:3350
 init_mount+0xd2/0x120 fs/init.c:25
 devtmpfs_setup+0x74/0xd0 drivers/base/devtmpfs.c:419
 devtmpfsd+0x15/0x50 drivers/base/devtmpfs.c:436
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801d275700: fb fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff88801d275780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff88801d275800: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
                                                    ^
 ffff88801d275880: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff88801d275900: fb fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
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