Date
June 26, 2025, 9:10 a.m.
| Environment | |
|---|---|
| dragonboard-845c | |
| qemu-x86_64 |
[ 41.008069] ================================================================== [ 41.019370] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 41.026078] Read of size 1 at addr ffff0000954c97a8 by task kunit_try_catch/274 [ 41.033489] [ 41.035023] CPU: 1 UID: 0 PID: 274 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250626 #1 PREEMPT [ 41.035054] Tainted: [B]=BAD_PAGE, [N]=TEST [ 41.035063] Hardware name: Thundercomm Dragonboard 845c (DT) [ 41.035074] Call trace: [ 41.035082] show_stack+0x20/0x38 (C) [ 41.035100] dump_stack_lvl+0x8c/0xd0 [ 41.035118] print_report+0x118/0x608 [ 41.035137] kasan_report+0xdc/0x128 [ 41.035157] __asan_report_load1_noabort+0x20/0x30 [ 41.035174] kmalloc_uaf2+0x3f4/0x468 [ 41.035190] kunit_try_run_case+0x170/0x3f0 [ 41.035210] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 41.035231] kthread+0x328/0x630 [ 41.035245] ret_from_fork+0x10/0x20 [ 41.035262] [ 41.100462] Allocated by task 274: [ 41.103924] kasan_save_stack+0x3c/0x68 [ 41.107834] kasan_save_track+0x20/0x40 [ 41.111741] kasan_save_alloc_info+0x40/0x58 [ 41.116086] __kasan_kmalloc+0xd4/0xd8 [ 41.119907] __kmalloc_cache_noprof+0x16c/0x3c0 [ 41.124516] kmalloc_uaf2+0xc4/0x468 [ 41.128153] kunit_try_run_case+0x170/0x3f0 [ 41.132406] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 41.137980] kthread+0x328/0x630 [ 41.141271] ret_from_fork+0x10/0x20 [ 41.144917] [ 41.146446] Freed by task 274: [ 41.149559] kasan_save_stack+0x3c/0x68 [ 41.153468] kasan_save_track+0x20/0x40 [ 41.157375] kasan_save_free_info+0x4c/0x78 [ 41.161628] __kasan_slab_free+0x6c/0x98 [ 41.165624] kfree+0x214/0x3c8 [ 41.168741] kmalloc_uaf2+0x134/0x468 [ 41.172474] kunit_try_run_case+0x170/0x3f0 [ 41.176727] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 41.182298] kthread+0x328/0x630 [ 41.185589] ret_from_fork+0x10/0x20 [ 41.189227] [ 41.190757] The buggy address belongs to the object at ffff0000954c9780 [ 41.190757] which belongs to the cache kmalloc-64 of size 64 [ 41.203240] The buggy address is located 40 bytes inside of [ 41.203240] freed 64-byte region [ffff0000954c9780, ffff0000954c97c0) [ 41.215462] [ 41.216997] The buggy address belongs to the physical page: [ 41.222647] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1154c9 [ 41.230760] anon flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 41.237817] page_type: f5(slab) [ 41.241022] raw: 0bfffe0000000000 ffff0000800028c0 0000000000000000 dead000000000001 [ 41.248868] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 41.256710] page dumped because: kasan: bad access detected [ 41.262359] [ 41.263885] Memory state around the buggy address: [ 41.268742] ffff0000954c9680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 41.276057] ffff0000954c9700: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 41.283373] >ffff0000954c9780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 41.290683] ^ [ 41.295280] ffff0000954c9800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 41.302604] ffff0000954c9880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 41.309927] ==================================================================
[ 22.421333] ================================================================== [ 22.421814] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 22.422039] Read of size 1 at addr ffff8881024d1ba8 by task kunit_try_catch/217 [ 22.422267] [ 22.422360] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250626 #1 PREEMPT(voluntary) [ 22.422412] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.422425] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.422449] Call Trace: [ 22.422463] <TASK> [ 22.422486] dump_stack_lvl+0x73/0xb0 [ 22.422518] print_report+0xd1/0x650 [ 22.422539] ? __virt_addr_valid+0x1db/0x2d0 [ 22.422564] ? kmalloc_uaf2+0x4a8/0x520 [ 22.422582] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.422607] ? kmalloc_uaf2+0x4a8/0x520 [ 22.422626] kasan_report+0x141/0x180 [ 22.422647] ? kmalloc_uaf2+0x4a8/0x520 [ 22.422670] __asan_report_load1_noabort+0x18/0x20 [ 22.422693] kmalloc_uaf2+0x4a8/0x520 [ 22.422712] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 22.422730] ? finish_task_switch.isra.0+0x153/0x700 [ 22.422752] ? __switch_to+0x47/0xf50 [ 22.422778] ? __schedule+0x10cc/0x2b60 [ 22.422803] ? __pfx_read_tsc+0x10/0x10 [ 22.422825] ? ktime_get_ts64+0x86/0x230 [ 22.422850] kunit_try_run_case+0x1a5/0x480 [ 22.422876] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.422897] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 22.422921] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 22.422945] ? __kthread_parkme+0x82/0x180 [ 22.422965] ? preempt_count_sub+0x50/0x80 [ 22.422987] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.423010] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.423039] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 22.423061] kthread+0x337/0x6f0 [ 22.423080] ? trace_preempt_on+0x20/0xc0 [ 22.423104] ? __pfx_kthread+0x10/0x10 [ 22.423123] ? _raw_spin_unlock_irq+0x47/0x80 [ 22.423145] ? calculate_sigpending+0x7b/0xa0 [ 22.423169] ? __pfx_kthread+0x10/0x10 [ 22.423189] ret_from_fork+0x116/0x1d0 [ 22.423208] ? __pfx_kthread+0x10/0x10 [ 22.423585] ret_from_fork_asm+0x1a/0x30 [ 22.423647] </TASK> [ 22.423926] [ 22.434891] Allocated by task 217: [ 22.435049] kasan_save_stack+0x45/0x70 [ 22.435318] kasan_save_track+0x18/0x40 [ 22.435503] kasan_save_alloc_info+0x3b/0x50 [ 22.435708] __kasan_kmalloc+0xb7/0xc0 [ 22.435968] __kmalloc_cache_noprof+0x189/0x420 [ 22.436229] kmalloc_uaf2+0xc6/0x520 [ 22.436394] kunit_try_run_case+0x1a5/0x480 [ 22.436535] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.436847] kthread+0x337/0x6f0 [ 22.437056] ret_from_fork+0x116/0x1d0 [ 22.437254] ret_from_fork_asm+0x1a/0x30 [ 22.437401] [ 22.437467] Freed by task 217: [ 22.437571] kasan_save_stack+0x45/0x70 [ 22.437706] kasan_save_track+0x18/0x40 [ 22.437982] kasan_save_free_info+0x3f/0x60 [ 22.438212] __kasan_slab_free+0x56/0x70 [ 22.438411] kfree+0x222/0x3f0 [ 22.438570] kmalloc_uaf2+0x14c/0x520 [ 22.438739] kunit_try_run_case+0x1a5/0x480 [ 22.439050] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.439313] kthread+0x337/0x6f0 [ 22.439504] ret_from_fork+0x116/0x1d0 [ 22.439700] ret_from_fork_asm+0x1a/0x30 [ 22.439976] [ 22.440090] The buggy address belongs to the object at ffff8881024d1b80 [ 22.440090] which belongs to the cache kmalloc-64 of size 64 [ 22.440605] The buggy address is located 40 bytes inside of [ 22.440605] freed 64-byte region [ffff8881024d1b80, ffff8881024d1bc0) [ 22.441067] [ 22.441139] The buggy address belongs to the physical page: [ 22.441321] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d1 [ 22.441649] flags: 0x200000000000000(node=0|zone=2) [ 22.442022] page_type: f5(slab) [ 22.442198] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 22.442566] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 22.442905] page dumped because: kasan: bad access detected [ 22.443140] [ 22.443264] Memory state around the buggy address: [ 22.443489] ffff8881024d1a80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 22.443899] ffff8881024d1b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 22.444287] >ffff8881024d1b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 22.444552] ^ [ 22.444694] ffff8881024d1c00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 22.445099] ffff8881024d1c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.445449] ==================================================================