Date
June 25, 2025, 8:08 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 27.220860] ================================================================== [ 27.220940] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 27.221008] Read of size 8 at addr fff00000c7894ec0 by task kunit_try_catch/212 [ 27.221059] [ 27.221097] CPU: 1 UID: 0 PID: 212 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT [ 27.221185] Tainted: [B]=BAD_PAGE, [N]=TEST [ 27.221212] Hardware name: linux,dummy-virt (DT) [ 27.221245] Call trace: [ 27.221268] show_stack+0x20/0x38 (C) [ 27.221320] dump_stack_lvl+0x8c/0xd0 [ 27.221369] print_report+0x118/0x608 [ 27.221431] kasan_report+0xdc/0x128 [ 27.221491] __asan_report_load8_noabort+0x20/0x30 [ 27.221539] workqueue_uaf+0x480/0x4a8 [ 27.221582] kunit_try_run_case+0x170/0x3f0 [ 27.221631] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 27.222059] kthread+0x328/0x630 [ 27.222578] ret_from_fork+0x10/0x20 [ 27.222985] [ 27.223232] Allocated by task 212: [ 27.223328] kasan_save_stack+0x3c/0x68 [ 27.223402] kasan_save_track+0x20/0x40 [ 27.223440] kasan_save_alloc_info+0x40/0x58 [ 27.223702] __kasan_kmalloc+0xd4/0xd8 [ 27.223805] __kmalloc_cache_noprof+0x16c/0x3c0 [ 27.224252] workqueue_uaf+0x13c/0x4a8 [ 27.224311] kunit_try_run_case+0x170/0x3f0 [ 27.224348] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 27.224392] kthread+0x328/0x630 [ 27.224436] ret_from_fork+0x10/0x20 [ 27.224474] [ 27.224495] Freed by task 48: [ 27.224520] kasan_save_stack+0x3c/0x68 [ 27.224557] kasan_save_track+0x20/0x40 [ 27.224595] kasan_save_free_info+0x4c/0x78 [ 27.224630] __kasan_slab_free+0x6c/0x98 [ 27.224707] kfree+0x214/0x3c8 [ 27.224741] workqueue_uaf_work+0x18/0x30 [ 27.224778] process_one_work+0x530/0xf98 [ 27.225090] worker_thread+0x618/0xf38 [ 27.225132] kthread+0x328/0x630 [ 27.225166] ret_from_fork+0x10/0x20 [ 27.225203] [ 27.225225] Last potentially related work creation: [ 27.225253] kasan_save_stack+0x3c/0x68 [ 27.225290] kasan_record_aux_stack+0xb4/0xc8 [ 27.225369] __queue_work+0x65c/0xfe0 [ 27.225829] queue_work_on+0xbc/0xf8 [ 27.225871] workqueue_uaf+0x210/0x4a8 [ 27.225934] kunit_try_run_case+0x170/0x3f0 [ 27.225971] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 27.226015] kthread+0x328/0x630 [ 27.226047] ret_from_fork+0x10/0x20 [ 27.226086] [ 27.226106] The buggy address belongs to the object at fff00000c7894ec0 [ 27.226106] which belongs to the cache kmalloc-32 of size 32 [ 27.226670] The buggy address is located 0 bytes inside of [ 27.226670] freed 32-byte region [fff00000c7894ec0, fff00000c7894ee0) [ 27.226769] [ 27.226844] The buggy address belongs to the physical page: [ 27.226906] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107894 [ 27.226960] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 27.227011] page_type: f5(slab) [ 27.227060] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 27.227240] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 27.227341] page dumped because: kasan: bad access detected [ 27.227374] [ 27.227392] Memory state around the buggy address: [ 27.227436] fff00000c7894d80: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 27.227478] fff00000c7894e00: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 27.227725] >fff00000c7894e80: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 27.227769] ^ [ 27.227805] fff00000c7894f00: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.227847] fff00000c7894f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.228104] ==================================================================
[ 22.476579] ================================================================== [ 22.477024] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 22.477408] Read of size 8 at addr ffff88810258c8c0 by task kunit_try_catch/229 [ 22.477705] [ 22.477830] CPU: 0 UID: 0 PID: 229 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT(voluntary) [ 22.477878] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.477890] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.477911] Call Trace: [ 22.477926] <TASK> [ 22.477954] dump_stack_lvl+0x73/0xb0 [ 22.477984] print_report+0xd1/0x650 [ 22.478005] ? __virt_addr_valid+0x1db/0x2d0 [ 22.478030] ? workqueue_uaf+0x4d6/0x560 [ 22.478083] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.478110] ? workqueue_uaf+0x4d6/0x560 [ 22.478131] kasan_report+0x141/0x180 [ 22.478154] ? workqueue_uaf+0x4d6/0x560 [ 22.478179] __asan_report_load8_noabort+0x18/0x20 [ 22.478203] workqueue_uaf+0x4d6/0x560 [ 22.478225] ? __pfx_workqueue_uaf+0x10/0x10 [ 22.478248] ? __schedule+0x10cc/0x2b60 [ 22.478530] ? __pfx_read_tsc+0x10/0x10 [ 22.478567] ? ktime_get_ts64+0x86/0x230 [ 22.478610] kunit_try_run_case+0x1a5/0x480 [ 22.478638] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.478663] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 22.478686] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 22.478711] ? __kthread_parkme+0x82/0x180 [ 22.478733] ? preempt_count_sub+0x50/0x80 [ 22.478757] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.478782] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.478806] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 22.479133] kthread+0x337/0x6f0 [ 22.479158] ? trace_preempt_on+0x20/0xc0 [ 22.479184] ? __pfx_kthread+0x10/0x10 [ 22.479206] ? _raw_spin_unlock_irq+0x47/0x80 [ 22.479231] ? calculate_sigpending+0x7b/0xa0 [ 22.479255] ? __pfx_kthread+0x10/0x10 [ 22.479277] ret_from_fork+0x116/0x1d0 [ 22.479297] ? __pfx_kthread+0x10/0x10 [ 22.479318] ret_from_fork_asm+0x1a/0x30 [ 22.479348] </TASK> [ 22.479360] [ 22.488912] Allocated by task 229: [ 22.489085] kasan_save_stack+0x45/0x70 [ 22.489333] kasan_save_track+0x18/0x40 [ 22.489552] kasan_save_alloc_info+0x3b/0x50 [ 22.489735] __kasan_kmalloc+0xb7/0xc0 [ 22.489957] __kmalloc_cache_noprof+0x189/0x420 [ 22.490155] workqueue_uaf+0x152/0x560 [ 22.490276] kunit_try_run_case+0x1a5/0x480 [ 22.490411] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.491082] kthread+0x337/0x6f0 [ 22.491292] ret_from_fork+0x116/0x1d0 [ 22.491470] ret_from_fork_asm+0x1a/0x30 [ 22.491622] [ 22.491721] Freed by task 9: [ 22.492032] kasan_save_stack+0x45/0x70 [ 22.492243] kasan_save_track+0x18/0x40 [ 22.492510] kasan_save_free_info+0x3f/0x60 [ 22.492722] __kasan_slab_free+0x56/0x70 [ 22.493030] kfree+0x222/0x3f0 [ 22.493158] workqueue_uaf_work+0x12/0x20 [ 22.493284] process_one_work+0x5ee/0xf60 [ 22.493412] worker_thread+0x758/0x1220 [ 22.493538] kthread+0x337/0x6f0 [ 22.493799] ret_from_fork+0x116/0x1d0 [ 22.494113] ret_from_fork_asm+0x1a/0x30 [ 22.494331] [ 22.494431] Last potentially related work creation: [ 22.494714] kasan_save_stack+0x45/0x70 [ 22.495450] kasan_record_aux_stack+0xb2/0xc0 [ 22.495627] __queue_work+0x61a/0xe70 [ 22.496333] queue_work_on+0xb6/0xc0 [ 22.496477] workqueue_uaf+0x26d/0x560 [ 22.496877] kunit_try_run_case+0x1a5/0x480 [ 22.497351] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.497684] kthread+0x337/0x6f0 [ 22.497968] ret_from_fork+0x116/0x1d0 [ 22.498134] ret_from_fork_asm+0x1a/0x30 [ 22.498512] [ 22.498609] The buggy address belongs to the object at ffff88810258c8c0 [ 22.498609] which belongs to the cache kmalloc-32 of size 32 [ 22.499413] The buggy address is located 0 bytes inside of [ 22.499413] freed 32-byte region [ffff88810258c8c0, ffff88810258c8e0) [ 22.500017] [ 22.500117] The buggy address belongs to the physical page: [ 22.500374] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10258c [ 22.500702] flags: 0x200000000000000(node=0|zone=2) [ 22.501000] page_type: f5(slab) [ 22.501177] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 22.501500] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 22.501861] page dumped because: kasan: bad access detected [ 22.502202] [ 22.502297] Memory state around the buggy address: [ 22.502514] ffff88810258c780: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 22.502823] ffff88810258c800: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 22.503370] >ffff88810258c880: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 22.503639] ^ [ 22.503865] ffff88810258c900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.504174] ffff88810258c980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.504457] ==================================================================