Date
July 18, 2025, 1:09 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.508182] ================================================================== [ 31.508373] BUG: KASAN: slab-use-after-free in kmalloc_uaf_16+0x3bc/0x438 [ 31.508572] Read of size 16 at addr fff00000c907e0c0 by task kunit_try_catch/199 [ 31.508681] [ 31.508744] CPU: 0 UID: 0 PID: 199 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250718 #1 PREEMPT [ 31.508998] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.509175] Hardware name: linux,dummy-virt (DT) [ 31.509280] Call trace: [ 31.509303] show_stack+0x20/0x38 (C) [ 31.509409] dump_stack_lvl+0x8c/0xd0 [ 31.509678] print_report+0x118/0x5e8 [ 31.509849] kasan_report+0xdc/0x128 [ 31.510044] __asan_report_load16_noabort+0x20/0x30 [ 31.510303] kmalloc_uaf_16+0x3bc/0x438 [ 31.510363] kunit_try_run_case+0x170/0x3f0 [ 31.510587] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.510789] kthread+0x328/0x630 [ 31.510997] ret_from_fork+0x10/0x20 [ 31.511266] [ 31.511414] Allocated by task 199: [ 31.511591] kasan_save_stack+0x3c/0x68 [ 31.511952] kasan_save_track+0x20/0x40 [ 31.512022] kasan_save_alloc_info+0x40/0x58 [ 31.512076] __kasan_kmalloc+0xd4/0xd8 [ 31.512220] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.512260] kmalloc_uaf_16+0x140/0x438 [ 31.512312] kunit_try_run_case+0x170/0x3f0 [ 31.512347] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.512586] kthread+0x328/0x630 [ 31.512825] ret_from_fork+0x10/0x20 [ 31.512926] [ 31.513017] Freed by task 199: [ 31.513061] kasan_save_stack+0x3c/0x68 [ 31.513107] kasan_save_track+0x20/0x40 [ 31.513457] kasan_save_free_info+0x4c/0x78 [ 31.513513] __kasan_slab_free+0x6c/0x98 [ 31.513844] kfree+0x214/0x3c8 [ 31.513960] kmalloc_uaf_16+0x190/0x438 [ 31.513999] kunit_try_run_case+0x170/0x3f0 [ 31.514051] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.514105] kthread+0x328/0x630 [ 31.514137] ret_from_fork+0x10/0x20 [ 31.514172] [ 31.514191] The buggy address belongs to the object at fff00000c907e0c0 [ 31.514191] which belongs to the cache kmalloc-16 of size 16 [ 31.514374] The buggy address is located 0 bytes inside of [ 31.514374] freed 16-byte region [fff00000c907e0c0, fff00000c907e0d0) [ 31.514453] [ 31.514482] The buggy address belongs to the physical page: [ 31.514526] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xfff00000c907e020 pfn:0x10907e [ 31.514591] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.514646] page_type: f5(slab) [ 31.514700] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 31.514749] raw: fff00000c907e020 000000008080007f 00000000f5000000 0000000000000000 [ 31.514787] page dumped because: kasan: bad access detected [ 31.514816] [ 31.514833] Memory state around the buggy address: [ 31.514863] fff00000c907df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.514905] fff00000c907e000: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.514945] >fff00000c907e080: fa fb fc fc 00 00 fc fc fa fb fc fc fc fc fc fc [ 31.514981] ^ [ 31.515013] fff00000c907e100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.515062] fff00000c907e180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.515108] ==================================================================
[ 24.853252] ================================================================== [ 24.853626] BUG: KASAN: slab-use-after-free in kmalloc_uaf_16+0x47b/0x4c0 [ 24.854194] Read of size 16 at addr ffff888105380c00 by task kunit_try_catch/216 [ 24.854848] [ 24.855020] CPU: 0 UID: 0 PID: 216 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250718 #1 PREEMPT(voluntary) [ 24.855070] Tainted: [B]=BAD_PAGE, [N]=TEST [ 24.855081] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 24.855103] Call Trace: [ 24.855115] <TASK> [ 24.855131] dump_stack_lvl+0x73/0xb0 [ 24.855165] print_report+0xd1/0x640 [ 24.855188] ? __virt_addr_valid+0x1db/0x2d0 [ 24.855228] ? kmalloc_uaf_16+0x47b/0x4c0 [ 24.855247] ? kasan_complete_mode_report_info+0x64/0x200 [ 24.855272] ? kmalloc_uaf_16+0x47b/0x4c0 [ 24.855292] kasan_report+0x141/0x180 [ 24.855313] ? kmalloc_uaf_16+0x47b/0x4c0 [ 24.855337] __asan_report_load16_noabort+0x18/0x20 [ 24.855361] kmalloc_uaf_16+0x47b/0x4c0 [ 24.855381] ? __pfx_kmalloc_uaf_16+0x10/0x10 [ 24.855401] ? sysvec_apic_timer_interrupt+0x50/0x90 [ 24.855426] ? trace_hardirqs_on+0x37/0xe0 [ 24.855449] ? __pfx_read_tsc+0x10/0x10 [ 24.855471] ? ktime_get_ts64+0x86/0x230 [ 24.855511] kunit_try_run_case+0x1a5/0x480 [ 24.855554] ? __pfx_kunit_try_run_case+0x10/0x10 [ 24.855588] ? queued_spin_lock_slowpath+0x116/0xb40 [ 24.855623] ? __kthread_parkme+0x82/0x180 [ 24.855643] ? preempt_count_sub+0x50/0x80 [ 24.855665] ? __pfx_kunit_try_run_case+0x10/0x10 [ 24.855687] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.855710] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 24.855732] kthread+0x337/0x6f0 [ 24.855750] ? trace_preempt_on+0x20/0xc0 [ 24.855772] ? __pfx_kthread+0x10/0x10 [ 24.855791] ? _raw_spin_unlock_irq+0x47/0x80 [ 24.855838] ? calculate_sigpending+0x7b/0xa0 [ 24.855862] ? __pfx_kthread+0x10/0x10 [ 24.855882] ret_from_fork+0x116/0x1d0 [ 24.855901] ? __pfx_kthread+0x10/0x10 [ 24.855920] ret_from_fork_asm+0x1a/0x30 [ 24.855951] </TASK> [ 24.855962] [ 24.868450] Allocated by task 216: [ 24.868593] kasan_save_stack+0x45/0x70 [ 24.868739] kasan_save_track+0x18/0x40 [ 24.869110] kasan_save_alloc_info+0x3b/0x50 [ 24.869515] __kasan_kmalloc+0xb7/0xc0 [ 24.869836] __kmalloc_cache_noprof+0x189/0x420 [ 24.870319] kmalloc_uaf_16+0x15b/0x4c0 [ 24.870734] kunit_try_run_case+0x1a5/0x480 [ 24.871190] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.871514] kthread+0x337/0x6f0 [ 24.871631] ret_from_fork+0x116/0x1d0 [ 24.871758] ret_from_fork_asm+0x1a/0x30 [ 24.872235] [ 24.872388] Freed by task 216: [ 24.872655] kasan_save_stack+0x45/0x70 [ 24.873022] kasan_save_track+0x18/0x40 [ 24.873494] kasan_save_free_info+0x3f/0x60 [ 24.873881] __kasan_slab_free+0x56/0x70 [ 24.874336] kfree+0x222/0x3f0 [ 24.874675] kmalloc_uaf_16+0x1d6/0x4c0 [ 24.875078] kunit_try_run_case+0x1a5/0x480 [ 24.875240] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.875407] kthread+0x337/0x6f0 [ 24.875519] ret_from_fork+0x116/0x1d0 [ 24.875643] ret_from_fork_asm+0x1a/0x30 [ 24.875775] [ 24.875977] The buggy address belongs to the object at ffff888105380c00 [ 24.875977] which belongs to the cache kmalloc-16 of size 16 [ 24.877113] The buggy address is located 0 bytes inside of [ 24.877113] freed 16-byte region [ffff888105380c00, ffff888105380c10) [ 24.878340] [ 24.878504] The buggy address belongs to the physical page: [ 24.879088] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105380 [ 24.879833] flags: 0x200000000000000(node=0|zone=2) [ 24.880405] page_type: f5(slab) [ 24.880540] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 24.880764] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 24.881447] page dumped because: kasan: bad access detected [ 24.881934] [ 24.882102] Memory state around the buggy address: [ 24.882714] ffff888105380b00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 24.883365] ffff888105380b80: fa fb fc fc fa fb fc fc fa fb fc fc 00 00 fc fc [ 24.883581] >ffff888105380c00: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.883787] ^ [ 24.884167] ffff888105380c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.884871] ffff888105380d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.885836] ==================================================================