Date
July 20, 2025, 11:12 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.444279] ================================================================== [ 15.444438] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 15.444582] Read of size 1 at addr fff00000c70109a8 by task kunit_try_catch/188 [ 15.444636] [ 15.444679] CPU: 0 UID: 0 PID: 188 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.444760] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.444895] Hardware name: linux,dummy-virt (DT) [ 15.445062] Call trace: [ 15.445109] show_stack+0x20/0x38 (C) [ 15.445162] dump_stack_lvl+0x8c/0xd0 [ 15.445226] print_report+0x118/0x5d0 [ 15.445302] kasan_report+0xdc/0x128 [ 15.445483] __asan_report_load1_noabort+0x20/0x30 [ 15.445534] kmalloc_uaf2+0x3f4/0x468 [ 15.445677] kunit_try_run_case+0x170/0x3f0 [ 15.445738] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.445792] kthread+0x328/0x630 [ 15.445847] ret_from_fork+0x10/0x20 [ 15.445899] [ 15.445917] Allocated by task 188: [ 15.445965] kasan_save_stack+0x3c/0x68 [ 15.446008] kasan_save_track+0x20/0x40 [ 15.446045] kasan_save_alloc_info+0x40/0x58 [ 15.446086] __kasan_kmalloc+0xd4/0xd8 [ 15.446130] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.446169] kmalloc_uaf2+0xc4/0x468 [ 15.446202] kunit_try_run_case+0x170/0x3f0 [ 15.446237] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.446282] kthread+0x328/0x630 [ 15.446320] ret_from_fork+0x10/0x20 [ 15.446364] [ 15.446383] Freed by task 188: [ 15.446418] kasan_save_stack+0x3c/0x68 [ 15.446456] kasan_save_track+0x20/0x40 [ 15.446493] kasan_save_free_info+0x4c/0x78 [ 15.446530] __kasan_slab_free+0x6c/0x98 [ 15.446566] kfree+0x214/0x3c8 [ 15.446607] kmalloc_uaf2+0x134/0x468 [ 15.446642] kunit_try_run_case+0x170/0x3f0 [ 15.446689] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.446731] kthread+0x328/0x630 [ 15.446761] ret_from_fork+0x10/0x20 [ 15.446796] [ 15.446814] The buggy address belongs to the object at fff00000c7010980 [ 15.446814] which belongs to the cache kmalloc-64 of size 64 [ 15.446872] The buggy address is located 40 bytes inside of [ 15.446872] freed 64-byte region [fff00000c7010980, fff00000c70109c0) [ 15.447254] [ 15.447304] The buggy address belongs to the physical page: [ 15.447341] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107010 [ 15.447395] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.447443] page_type: f5(slab) [ 15.447481] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 15.447716] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 15.447814] page dumped because: kasan: bad access detected [ 15.447909] [ 15.447990] Memory state around the buggy address: [ 15.448110] fff00000c7010880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 15.448167] fff00000c7010900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 15.448379] >fff00000c7010980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 15.448517] ^ [ 15.448602] fff00000c7010a00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 15.448690] fff00000c7010a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.448790] ==================================================================
[ 12.609514] ================================================================== [ 12.609987] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 12.610308] Read of size 1 at addr ffff8881027362a8 by task kunit_try_catch/205 [ 12.610657] [ 12.610777] CPU: 1 UID: 0 PID: 205 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 12.610820] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.610831] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.610850] Call Trace: [ 12.610862] <TASK> [ 12.610876] dump_stack_lvl+0x73/0xb0 [ 12.610913] print_report+0xd1/0x610 [ 12.610935] ? __virt_addr_valid+0x1db/0x2d0 [ 12.610956] ? kmalloc_uaf2+0x4a8/0x520 [ 12.610974] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.610995] ? kmalloc_uaf2+0x4a8/0x520 [ 12.611014] kasan_report+0x141/0x180 [ 12.611034] ? kmalloc_uaf2+0x4a8/0x520 [ 12.611061] __asan_report_load1_noabort+0x18/0x20 [ 12.611084] kmalloc_uaf2+0x4a8/0x520 [ 12.611102] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 12.611120] ? finish_task_switch.isra.0+0x153/0x700 [ 12.611140] ? __switch_to+0x47/0xf50 [ 12.611165] ? __schedule+0x10cc/0x2b60 [ 12.611186] ? __pfx_read_tsc+0x10/0x10 [ 12.611205] ? ktime_get_ts64+0x86/0x230 [ 12.611228] kunit_try_run_case+0x1a5/0x480 [ 12.611250] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.611271] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.611292] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.611314] ? __kthread_parkme+0x82/0x180 [ 12.611354] ? preempt_count_sub+0x50/0x80 [ 12.611377] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.611399] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.611421] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.611442] kthread+0x337/0x6f0 [ 12.611460] ? trace_preempt_on+0x20/0xc0 [ 12.611481] ? __pfx_kthread+0x10/0x10 [ 12.611501] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.611521] ? calculate_sigpending+0x7b/0xa0 [ 12.611543] ? __pfx_kthread+0x10/0x10 [ 12.611563] ret_from_fork+0x116/0x1d0 [ 12.611579] ? __pfx_kthread+0x10/0x10 [ 12.611598] ret_from_fork_asm+0x1a/0x30 [ 12.611627] </TASK> [ 12.611636] [ 12.618941] Allocated by task 205: [ 12.619147] kasan_save_stack+0x45/0x70 [ 12.619450] kasan_save_track+0x18/0x40 [ 12.619639] kasan_save_alloc_info+0x3b/0x50 [ 12.619864] __kasan_kmalloc+0xb7/0xc0 [ 12.620059] __kmalloc_cache_noprof+0x189/0x420 [ 12.620254] kmalloc_uaf2+0xc6/0x520 [ 12.620413] kunit_try_run_case+0x1a5/0x480 [ 12.620559] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.620917] kthread+0x337/0x6f0 [ 12.621261] ret_from_fork+0x116/0x1d0 [ 12.621497] ret_from_fork_asm+0x1a/0x30 [ 12.621699] [ 12.621839] Freed by task 205: [ 12.622005] kasan_save_stack+0x45/0x70 [ 12.622167] kasan_save_track+0x18/0x40 [ 12.622400] kasan_save_free_info+0x3f/0x60 [ 12.622612] __kasan_slab_free+0x56/0x70 [ 12.622795] kfree+0x222/0x3f0 [ 12.622987] kmalloc_uaf2+0x14c/0x520 [ 12.623153] kunit_try_run_case+0x1a5/0x480 [ 12.623318] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.623583] kthread+0x337/0x6f0 [ 12.623892] ret_from_fork+0x116/0x1d0 [ 12.624260] ret_from_fork_asm+0x1a/0x30 [ 12.624635] [ 12.624816] The buggy address belongs to the object at ffff888102736280 [ 12.624816] which belongs to the cache kmalloc-64 of size 64 [ 12.625846] The buggy address is located 40 bytes inside of [ 12.625846] freed 64-byte region [ffff888102736280, ffff8881027362c0) [ 12.626976] [ 12.627229] The buggy address belongs to the physical page: [ 12.627737] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102736 [ 12.627986] flags: 0x200000000000000(node=0|zone=2) [ 12.628147] page_type: f5(slab) [ 12.628269] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 12.628627] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 12.629360] page dumped because: kasan: bad access detected [ 12.629539] [ 12.629608] Memory state around the buggy address: [ 12.629965] ffff888102736180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 12.630615] ffff888102736200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 12.631316] >ffff888102736280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 12.632001] ^ [ 12.632480] ffff888102736300: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 12.633110] ffff888102736380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.633483] ==================================================================