Date
July 23, 2025, 3:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 32.824172] ================================================================== [ 32.824224] BUG: KASAN: slab-use-after-free in strlen+0xa8/0xb0 [ 32.824274] Read of size 1 at addr fff00000c9c2cc50 by task kunit_try_catch/292 [ 32.824352] [ 32.824401] CPU: 1 UID: 0 PID: 292 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250723 #1 PREEMPT [ 32.824531] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 32.824598] Hardware name: linux,dummy-virt (DT) [ 32.824723] Call trace: [ 32.824783] show_stack+0x20/0x38 (C) [ 32.824931] dump_stack_lvl+0x8c/0xd0 [ 32.825012] print_report+0x118/0x5e8 [ 32.825077] kasan_report+0xdc/0x128 [ 32.825123] __asan_report_load1_noabort+0x20/0x30 [ 32.825175] strlen+0xa8/0xb0 [ 32.825219] kasan_strings+0x418/0xb00 [ 32.825325] kunit_try_run_case+0x170/0x3f0 [ 32.825376] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.825431] kthread+0x328/0x630 [ 32.825473] ret_from_fork+0x10/0x20 [ 32.825587] [ 32.825655] Allocated by task 292: [ 32.825695] kasan_save_stack+0x3c/0x68 [ 32.825745] kasan_save_track+0x20/0x40 [ 32.825832] kasan_save_alloc_info+0x40/0x58 [ 32.825890] __kasan_kmalloc+0xd4/0xd8 [ 32.825944] __kmalloc_cache_noprof+0x16c/0x3c0 [ 32.826011] kasan_strings+0xc8/0xb00 [ 32.826085] kunit_try_run_case+0x170/0x3f0 [ 32.826122] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.826202] kthread+0x328/0x630 [ 32.826322] ret_from_fork+0x10/0x20 [ 32.826402] [ 32.826461] Freed by task 292: [ 32.826653] kasan_save_stack+0x3c/0x68 [ 32.826693] kasan_save_track+0x20/0x40 [ 32.826856] kasan_save_free_info+0x4c/0x78 [ 32.827008] __kasan_slab_free+0x6c/0x98 [ 32.827088] kfree+0x214/0x3c8 [ 32.827222] kasan_strings+0x24c/0xb00 [ 32.827310] kunit_try_run_case+0x170/0x3f0 [ 32.827395] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.827520] kthread+0x328/0x630 [ 32.827565] ret_from_fork+0x10/0x20 [ 32.827603] [ 32.827779] The buggy address belongs to the object at fff00000c9c2cc40 [ 32.827779] which belongs to the cache kmalloc-32 of size 32 [ 32.827842] The buggy address is located 16 bytes inside of [ 32.827842] freed 32-byte region [fff00000c9c2cc40, fff00000c9c2cc60) [ 32.827991] [ 32.828041] The buggy address belongs to the physical page: [ 32.828229] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109c2c [ 32.828284] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 32.828332] page_type: f5(slab) [ 32.828369] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 32.828491] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 32.828613] page dumped because: kasan: bad access detected [ 32.828684] [ 32.828770] Memory state around the buggy address: [ 32.828921] fff00000c9c2cb00: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 32.829014] fff00000c9c2cb80: 00 00 00 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 32.829121] >fff00000c9c2cc00: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 32.829189] ^ [ 32.829259] fff00000c9c2cc80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 32.829304] fff00000c9c2cd00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 32.829344] ==================================================================
[ 27.276595] ================================================================== [ 27.276900] BUG: KASAN: slab-use-after-free in strlen+0x8f/0xb0 [ 27.277180] Read of size 1 at addr ffff8881060ae110 by task kunit_try_catch/308 [ 27.277642] [ 27.277737] CPU: 1 UID: 0 PID: 308 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250723 #1 PREEMPT(voluntary) [ 27.277789] Tainted: [B]=BAD_PAGE, [N]=TEST [ 27.277803] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 27.277826] Call Trace: [ 27.277844] <TASK> [ 27.277863] dump_stack_lvl+0x73/0xb0 [ 27.277891] print_report+0xd1/0x640 [ 27.277914] ? __virt_addr_valid+0x1db/0x2d0 [ 27.277939] ? strlen+0x8f/0xb0 [ 27.277959] ? kasan_complete_mode_report_info+0x64/0x200 [ 27.277987] ? strlen+0x8f/0xb0 [ 27.278007] kasan_report+0x141/0x180 [ 27.278030] ? strlen+0x8f/0xb0 [ 27.278055] __asan_report_load1_noabort+0x18/0x20 [ 27.278093] strlen+0x8f/0xb0 [ 27.278114] kasan_strings+0x57b/0xe80 [ 27.278134] ? trace_hardirqs_on+0x37/0xe0 [ 27.278173] ? __pfx_kasan_strings+0x10/0x10 [ 27.278194] ? finish_task_switch.isra.0+0x153/0x700 [ 27.278216] ? __switch_to+0x47/0xf80 [ 27.278242] ? __schedule+0x10da/0x2b60 [ 27.278268] ? __pfx_read_tsc+0x10/0x10 [ 27.278289] ? ktime_get_ts64+0x86/0x230 [ 27.278314] kunit_try_run_case+0x1a5/0x480 [ 27.278339] ? __pfx_kunit_try_run_case+0x10/0x10 [ 27.278361] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 27.278403] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 27.278429] ? __kthread_parkme+0x82/0x180 [ 27.278449] ? preempt_count_sub+0x50/0x80 [ 27.278472] ? __pfx_kunit_try_run_case+0x10/0x10 [ 27.278497] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.278520] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 27.278544] kthread+0x337/0x6f0 [ 27.278564] ? trace_preempt_on+0x20/0xc0 [ 27.278586] ? __pfx_kthread+0x10/0x10 [ 27.278607] ? _raw_spin_unlock_irq+0x47/0x80 [ 27.278631] ? calculate_sigpending+0x7b/0xa0 [ 27.278655] ? __pfx_kthread+0x10/0x10 [ 27.278676] ret_from_fork+0x116/0x1d0 [ 27.278696] ? __pfx_kthread+0x10/0x10 [ 27.278717] ret_from_fork_asm+0x1a/0x30 [ 27.278749] </TASK> [ 27.278761] [ 27.286978] Allocated by task 308: [ 27.287155] kasan_save_stack+0x45/0x70 [ 27.287308] kasan_save_track+0x18/0x40 [ 27.287441] kasan_save_alloc_info+0x3b/0x50 [ 27.287590] __kasan_kmalloc+0xb7/0xc0 [ 27.287723] __kmalloc_cache_noprof+0x189/0x420 [ 27.287873] kasan_strings+0xc0/0xe80 [ 27.288055] kunit_try_run_case+0x1a5/0x480 [ 27.288265] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.288506] kthread+0x337/0x6f0 [ 27.288662] ret_from_fork+0x116/0x1d0 [ 27.288841] ret_from_fork_asm+0x1a/0x30 [ 27.289130] [ 27.289331] Freed by task 308: [ 27.289630] kasan_save_stack+0x45/0x70 [ 27.289788] kasan_save_track+0x18/0x40 [ 27.289996] kasan_save_free_info+0x3f/0x60 [ 27.290213] __kasan_slab_free+0x56/0x70 [ 27.290365] kfree+0x222/0x3f0 [ 27.290589] kasan_strings+0x2aa/0xe80 [ 27.290741] kunit_try_run_case+0x1a5/0x480 [ 27.290921] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.291181] kthread+0x337/0x6f0 [ 27.291339] ret_from_fork+0x116/0x1d0 [ 27.291602] ret_from_fork_asm+0x1a/0x30 [ 27.291780] [ 27.291845] The buggy address belongs to the object at ffff8881060ae100 [ 27.291845] which belongs to the cache kmalloc-32 of size 32 [ 27.292372] The buggy address is located 16 bytes inside of [ 27.292372] freed 32-byte region [ffff8881060ae100, ffff8881060ae120) [ 27.292833] [ 27.292902] The buggy address belongs to the physical page: [ 27.293383] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1060ae [ 27.293854] flags: 0x200000000000000(node=0|zone=2) [ 27.294213] page_type: f5(slab) [ 27.294426] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 27.294709] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 27.295086] page dumped because: kasan: bad access detected [ 27.295336] [ 27.295510] Memory state around the buggy address: [ 27.295704] ffff8881060ae000: 00 00 00 04 fc fc fc fc 00 00 07 fc fc fc fc fc [ 27.295972] ffff8881060ae080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 27.296312] >ffff8881060ae100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 27.296760] ^ [ 27.296917] ffff8881060ae180: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 27.297132] ffff8881060ae200: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 27.297355] ==================================================================