Date
July 16, 2025, 12:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 33.006333] ================================================================== [ 33.006422] BUG: KASAN: slab-use-after-free in strnlen+0x80/0x88 [ 33.006749] Read of size 1 at addr fff00000c9bb4890 by task kunit_try_catch/290 [ 33.006918] [ 33.007067] CPU: 0 UID: 0 PID: 290 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250716 #1 PREEMPT [ 33.007183] Tainted: [B]=BAD_PAGE, [N]=TEST [ 33.007218] Hardware name: linux,dummy-virt (DT) [ 33.007287] Call trace: [ 33.007313] show_stack+0x20/0x38 (C) [ 33.007535] dump_stack_lvl+0x8c/0xd0 [ 33.007589] print_report+0x118/0x5d0 [ 33.007910] kasan_report+0xdc/0x128 [ 33.008023] __asan_report_load1_noabort+0x20/0x30 [ 33.008173] strnlen+0x80/0x88 [ 33.008298] kasan_strings+0x478/0xb00 [ 33.008350] kunit_try_run_case+0x170/0x3f0 [ 33.008734] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.008882] kthread+0x328/0x630 [ 33.008999] ret_from_fork+0x10/0x20 [ 33.009169] [ 33.009290] Allocated by task 290: [ 33.009365] kasan_save_stack+0x3c/0x68 [ 33.009449] kasan_save_track+0x20/0x40 [ 33.009680] kasan_save_alloc_info+0x40/0x58 [ 33.009935] __kasan_kmalloc+0xd4/0xd8 [ 33.010074] __kmalloc_cache_noprof+0x16c/0x3c0 [ 33.010204] kasan_strings+0xc8/0xb00 [ 33.010334] kunit_try_run_case+0x170/0x3f0 [ 33.010582] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.010753] kthread+0x328/0x630 [ 33.010975] ret_from_fork+0x10/0x20 [ 33.011080] [ 33.011169] Freed by task 290: [ 33.011311] kasan_save_stack+0x3c/0x68 [ 33.011382] kasan_save_track+0x20/0x40 [ 33.011648] kasan_save_free_info+0x4c/0x78 [ 33.011817] __kasan_slab_free+0x6c/0x98 [ 33.011936] kfree+0x214/0x3c8 [ 33.012016] kasan_strings+0x24c/0xb00 [ 33.012058] kunit_try_run_case+0x170/0x3f0 [ 33.012097] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.012337] kthread+0x328/0x630 [ 33.012686] ret_from_fork+0x10/0x20 [ 33.012829] [ 33.013114] The buggy address belongs to the object at fff00000c9bb4880 [ 33.013114] which belongs to the cache kmalloc-32 of size 32 [ 33.013251] The buggy address is located 16 bytes inside of [ 33.013251] freed 32-byte region [fff00000c9bb4880, fff00000c9bb48a0) [ 33.013632] [ 33.013762] The buggy address belongs to the physical page: [ 33.013889] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109bb4 [ 33.014236] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 33.014438] page_type: f5(slab) [ 33.014516] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 33.014695] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 33.014768] page dumped because: kasan: bad access detected [ 33.014999] [ 33.015184] Memory state around the buggy address: [ 33.015344] fff00000c9bb4780: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 33.015418] fff00000c9bb4800: 00 00 00 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 33.015564] >fff00000c9bb4880: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 33.015639] ^ [ 33.015674] fff00000c9bb4900: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 33.016140] fff00000c9bb4980: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 33.016201] ==================================================================
[ 25.315204] ================================================================== [ 25.316533] BUG: KASAN: slab-use-after-free in strnlen+0x73/0x80 [ 25.317781] Read of size 1 at addr ffff8881053b8d50 by task kunit_try_catch/308 [ 25.318915] [ 25.319153] CPU: 0 UID: 0 PID: 308 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250716 #1 PREEMPT(voluntary) [ 25.319330] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.319347] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.319371] Call Trace: [ 25.319394] <TASK> [ 25.319425] dump_stack_lvl+0x73/0xb0 [ 25.319462] print_report+0xd1/0x610 [ 25.319486] ? __virt_addr_valid+0x1db/0x2d0 [ 25.319511] ? strnlen+0x73/0x80 [ 25.319534] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.319560] ? strnlen+0x73/0x80 [ 25.319657] kasan_report+0x141/0x180 [ 25.319681] ? strnlen+0x73/0x80 [ 25.319708] __asan_report_load1_noabort+0x18/0x20 [ 25.319733] strnlen+0x73/0x80 [ 25.319755] kasan_strings+0x615/0xe80 [ 25.319775] ? trace_hardirqs_on+0x37/0xe0 [ 25.319800] ? __pfx_kasan_strings+0x10/0x10 [ 25.319819] ? finish_task_switch.isra.0+0x153/0x700 [ 25.319841] ? __switch_to+0x47/0xf80 [ 25.319928] ? __schedule+0x10c6/0x2b60 [ 25.319956] ? __pfx_read_tsc+0x10/0x10 [ 25.319979] ? ktime_get_ts64+0x86/0x230 [ 25.320007] kunit_try_run_case+0x1a5/0x480 [ 25.320033] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.320055] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.320078] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.320100] ? __kthread_parkme+0x82/0x180 [ 25.320121] ? preempt_count_sub+0x50/0x80 [ 25.320143] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.320167] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.320193] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.320220] kthread+0x337/0x6f0 [ 25.320239] ? trace_preempt_on+0x20/0xc0 [ 25.320261] ? __pfx_kthread+0x10/0x10 [ 25.320282] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.320314] ? calculate_sigpending+0x7b/0xa0 [ 25.320339] ? __pfx_kthread+0x10/0x10 [ 25.320359] ret_from_fork+0x116/0x1d0 [ 25.320380] ? __pfx_kthread+0x10/0x10 [ 25.320399] ret_from_fork_asm+0x1a/0x30 [ 25.320431] </TASK> [ 25.320443] [ 25.333822] Allocated by task 308: [ 25.334330] kasan_save_stack+0x45/0x70 [ 25.334710] kasan_save_track+0x18/0x40 [ 25.335117] kasan_save_alloc_info+0x3b/0x50 [ 25.335576] __kasan_kmalloc+0xb7/0xc0 [ 25.335827] __kmalloc_cache_noprof+0x189/0x420 [ 25.336245] kasan_strings+0xc0/0xe80 [ 25.336441] kunit_try_run_case+0x1a5/0x480 [ 25.336587] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.337103] kthread+0x337/0x6f0 [ 25.337448] ret_from_fork+0x116/0x1d0 [ 25.337888] ret_from_fork_asm+0x1a/0x30 [ 25.338375] [ 25.338451] Freed by task 308: [ 25.338560] kasan_save_stack+0x45/0x70 [ 25.338919] kasan_save_track+0x18/0x40 [ 25.339334] kasan_save_free_info+0x3f/0x60 [ 25.339741] __kasan_slab_free+0x56/0x70 [ 25.340146] kfree+0x222/0x3f0 [ 25.340439] kasan_strings+0x2aa/0xe80 [ 25.340568] kunit_try_run_case+0x1a5/0x480 [ 25.340952] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.341476] kthread+0x337/0x6f0 [ 25.341648] ret_from_fork+0x116/0x1d0 [ 25.341777] ret_from_fork_asm+0x1a/0x30 [ 25.342139] [ 25.342322] The buggy address belongs to the object at ffff8881053b8d40 [ 25.342322] which belongs to the cache kmalloc-32 of size 32 [ 25.343511] The buggy address is located 16 bytes inside of [ 25.343511] freed 32-byte region [ffff8881053b8d40, ffff8881053b8d60) [ 25.344356] [ 25.344498] The buggy address belongs to the physical page: [ 25.344703] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1053b8 [ 25.345480] flags: 0x200000000000000(node=0|zone=2) [ 25.346082] page_type: f5(slab) [ 25.346346] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 25.346573] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 25.347272] page dumped because: kasan: bad access detected [ 25.347865] [ 25.348058] Memory state around the buggy address: [ 25.348381] ffff8881053b8c00: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 25.348630] ffff8881053b8c80: fa fb fb fb fc fc fc fc 00 00 07 fc fc fc fc fc [ 25.349320] >ffff8881053b8d00: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 25.349946] ^ [ 25.350419] ffff8881053b8d80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 25.350669] ffff8881053b8e00: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 25.350884] ==================================================================