Date
July 17, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.344878] ================================================================== [ 15.345166] BUG: KASAN: slab-use-after-free in kmalloc_uaf_16+0x3bc/0x438 [ 15.345261] Read of size 16 at addr fff00000c433ec20 by task kunit_try_catch/169 [ 15.345426] [ 15.345592] CPU: 0 UID: 0 PID: 169 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.345676] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.345702] Hardware name: linux,dummy-virt (DT) [ 15.346013] Call trace: [ 15.346100] show_stack+0x20/0x38 (C) [ 15.346208] dump_stack_lvl+0x8c/0xd0 [ 15.346359] print_report+0x118/0x5d0 [ 15.346591] kasan_report+0xdc/0x128 [ 15.346995] __asan_report_load16_noabort+0x20/0x30 [ 15.347081] kmalloc_uaf_16+0x3bc/0x438 [ 15.347214] kunit_try_run_case+0x170/0x3f0 [ 15.347357] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.347483] kthread+0x328/0x630 [ 15.347582] ret_from_fork+0x10/0x20 [ 15.347723] [ 15.347740] Allocated by task 169: [ 15.347779] kasan_save_stack+0x3c/0x68 [ 15.348096] kasan_save_track+0x20/0x40 [ 15.348241] kasan_save_alloc_info+0x40/0x58 [ 15.348397] __kasan_kmalloc+0xd4/0xd8 [ 15.348495] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.348669] kmalloc_uaf_16+0x140/0x438 [ 15.348736] kunit_try_run_case+0x170/0x3f0 [ 15.349049] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.349173] kthread+0x328/0x630 [ 15.349253] ret_from_fork+0x10/0x20 [ 15.349379] [ 15.349440] Freed by task 169: [ 15.349511] kasan_save_stack+0x3c/0x68 [ 15.349637] kasan_save_track+0x20/0x40 [ 15.349850] kasan_save_free_info+0x4c/0x78 [ 15.350061] __kasan_slab_free+0x6c/0x98 [ 15.350146] kfree+0x214/0x3c8 [ 15.350307] kmalloc_uaf_16+0x190/0x438 [ 15.350470] kunit_try_run_case+0x170/0x3f0 [ 15.350559] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.350613] kthread+0x328/0x630 [ 15.350651] ret_from_fork+0x10/0x20 [ 15.350878] [ 15.350901] The buggy address belongs to the object at fff00000c433ec20 [ 15.350901] which belongs to the cache kmalloc-16 of size 16 [ 15.351433] The buggy address is located 0 bytes inside of [ 15.351433] freed 16-byte region [fff00000c433ec20, fff00000c433ec30) [ 15.351636] [ 15.351855] The buggy address belongs to the physical page: [ 15.351933] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10433e [ 15.352122] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.352268] page_type: f5(slab) [ 15.352337] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.352430] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.352807] page dumped because: kasan: bad access detected [ 15.352867] [ 15.353068] Memory state around the buggy address: [ 15.353244] fff00000c433eb00: 00 07 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.353351] fff00000c433eb80: 00 04 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.353446] >fff00000c433ec00: 00 00 fc fc fa fb fc fc fc fc fc fc fc fc fc fc [ 15.353493] ^ [ 15.353523] fff00000c433ec80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.353564] fff00000c433ed00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.353609] ==================================================================
[ 13.092158] ================================================================== [ 13.092574] BUG: KASAN: slab-use-after-free in kmalloc_uaf_16+0x47b/0x4c0 [ 13.092804] Read of size 16 at addr ffff888101679d60 by task kunit_try_catch/185 [ 13.093029] [ 13.093110] CPU: 0 UID: 0 PID: 185 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 13.093151] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.093162] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.093181] Call Trace: [ 13.093193] <TASK> [ 13.093208] dump_stack_lvl+0x73/0xb0 [ 13.093234] print_report+0xd1/0x610 [ 13.093255] ? __virt_addr_valid+0x1db/0x2d0 [ 13.093278] ? kmalloc_uaf_16+0x47b/0x4c0 [ 13.093297] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.093318] ? kmalloc_uaf_16+0x47b/0x4c0 [ 13.093338] kasan_report+0x141/0x180 [ 13.093359] ? kmalloc_uaf_16+0x47b/0x4c0 [ 13.093384] __asan_report_load16_noabort+0x18/0x20 [ 13.093409] kmalloc_uaf_16+0x47b/0x4c0 [ 13.093429] ? __pfx_kmalloc_uaf_16+0x10/0x10 [ 13.093450] ? __schedule+0x10cc/0x2b60 [ 13.093470] ? __pfx_read_tsc+0x10/0x10 [ 13.093490] ? ktime_get_ts64+0x86/0x230 [ 13.093512] kunit_try_run_case+0x1a5/0x480 [ 13.093536] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.093603] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.093628] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.093652] ? __kthread_parkme+0x82/0x180 [ 13.093672] ? preempt_count_sub+0x50/0x80 [ 13.093696] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.093720] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.093745] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.093771] kthread+0x337/0x6f0 [ 13.093790] ? trace_preempt_on+0x20/0xc0 [ 13.093814] ? __pfx_kthread+0x10/0x10 [ 13.093834] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.094103] ? calculate_sigpending+0x7b/0xa0 [ 13.094132] ? __pfx_kthread+0x10/0x10 [ 13.094154] ret_from_fork+0x116/0x1d0 [ 13.094175] ? __pfx_kthread+0x10/0x10 [ 13.094195] ret_from_fork_asm+0x1a/0x30 [ 13.094436] </TASK> [ 13.094453] [ 13.101803] Allocated by task 185: [ 13.101967] kasan_save_stack+0x45/0x70 [ 13.102223] kasan_save_track+0x18/0x40 [ 13.102460] kasan_save_alloc_info+0x3b/0x50 [ 13.102690] __kasan_kmalloc+0xb7/0xc0 [ 13.102876] __kmalloc_cache_noprof+0x189/0x420 [ 13.103115] kmalloc_uaf_16+0x15b/0x4c0 [ 13.103337] kunit_try_run_case+0x1a5/0x480 [ 13.103566] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.103817] kthread+0x337/0x6f0 [ 13.103982] ret_from_fork+0x116/0x1d0 [ 13.104165] ret_from_fork_asm+0x1a/0x30 [ 13.104409] [ 13.104527] Freed by task 185: [ 13.104655] kasan_save_stack+0x45/0x70 [ 13.104865] kasan_save_track+0x18/0x40 [ 13.105059] kasan_save_free_info+0x3f/0x60 [ 13.105245] __kasan_slab_free+0x56/0x70 [ 13.105587] kfree+0x222/0x3f0 [ 13.105752] kmalloc_uaf_16+0x1d6/0x4c0 [ 13.105936] kunit_try_run_case+0x1a5/0x480 [ 13.106121] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.106455] kthread+0x337/0x6f0 [ 13.106654] ret_from_fork+0x116/0x1d0 [ 13.106812] ret_from_fork_asm+0x1a/0x30 [ 13.107028] [ 13.107114] The buggy address belongs to the object at ffff888101679d60 [ 13.107114] which belongs to the cache kmalloc-16 of size 16 [ 13.107746] The buggy address is located 0 bytes inside of [ 13.107746] freed 16-byte region [ffff888101679d60, ffff888101679d70) [ 13.108322] [ 13.108448] The buggy address belongs to the physical page: [ 13.108718] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101679 [ 13.109084] flags: 0x200000000000000(node=0|zone=2) [ 13.109312] page_type: f5(slab) [ 13.109502] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 13.109881] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 13.110208] page dumped because: kasan: bad access detected [ 13.110373] [ 13.110464] Memory state around the buggy address: [ 13.110620] ffff888101679c00: 00 04 fc fc 00 04 fc fc 00 01 fc fc 00 01 fc fc [ 13.110827] ffff888101679c80: 00 04 fc fc 00 04 fc fc fa fb fc fc 00 05 fc fc [ 13.111162] >ffff888101679d00: fa fb fc fc fa fb fc fc 00 00 fc fc fa fb fc fc [ 13.111720] ^ [ 13.112009] ffff888101679d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.112407] ffff888101679e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.113183] ==================================================================