Date
July 4, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 29.674577] ================================================================== [ 29.674762] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 29.674883] Read of size 1 at addr fff00000c9b70ba8 by task kunit_try_catch/221 [ 29.675027] [ 29.675085] CPU: 0 UID: 0 PID: 221 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT [ 29.675171] Tainted: [B]=BAD_PAGE, [N]=TEST [ 29.675239] Hardware name: linux,dummy-virt (DT) [ 29.675277] Call trace: [ 29.675345] show_stack+0x20/0x38 (C) [ 29.675435] dump_stack_lvl+0x8c/0xd0 [ 29.675482] print_report+0x118/0x608 [ 29.675567] kasan_report+0xdc/0x128 [ 29.675614] __asan_report_load1_noabort+0x20/0x30 [ 29.675662] kmalloc_uaf2+0x3f4/0x468 [ 29.675815] kunit_try_run_case+0x170/0x3f0 [ 29.675869] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.676024] kthread+0x328/0x630 [ 29.676066] ret_from_fork+0x10/0x20 [ 29.676113] [ 29.676130] Allocated by task 221: [ 29.676159] kasan_save_stack+0x3c/0x68 [ 29.676206] kasan_save_track+0x20/0x40 [ 29.676243] kasan_save_alloc_info+0x40/0x58 [ 29.676280] __kasan_kmalloc+0xd4/0xd8 [ 29.676318] __kmalloc_cache_noprof+0x16c/0x3c0 [ 29.676355] kmalloc_uaf2+0xc4/0x468 [ 29.676391] kunit_try_run_case+0x170/0x3f0 [ 29.676430] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.676474] kthread+0x328/0x630 [ 29.676506] ret_from_fork+0x10/0x20 [ 29.676540] [ 29.676559] Freed by task 221: [ 29.676585] kasan_save_stack+0x3c/0x68 [ 29.676623] kasan_save_track+0x20/0x40 [ 29.676659] kasan_save_free_info+0x4c/0x78 [ 29.676696] __kasan_slab_free+0x6c/0x98 [ 29.676733] kfree+0x214/0x3c8 [ 29.676767] kmalloc_uaf2+0x134/0x468 [ 29.677762] kunit_try_run_case+0x170/0x3f0 [ 29.677812] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.677857] kthread+0x328/0x630 [ 29.677888] ret_from_fork+0x10/0x20 [ 29.677934] [ 29.677953] The buggy address belongs to the object at fff00000c9b70b80 [ 29.677953] which belongs to the cache kmalloc-64 of size 64 [ 29.678012] The buggy address is located 40 bytes inside of [ 29.678012] freed 64-byte region [fff00000c9b70b80, fff00000c9b70bc0) [ 29.678073] [ 29.678093] The buggy address belongs to the physical page: [ 29.678123] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109b70 [ 29.678174] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 29.678221] page_type: f5(slab) [ 29.678257] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 29.678308] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 29.678348] page dumped because: kasan: bad access detected [ 29.678379] [ 29.678396] Memory state around the buggy address: [ 29.678427] fff00000c9b70a80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 29.678469] fff00000c9b70b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 29.678513] >fff00000c9b70b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 29.678551] ^ [ 29.678583] fff00000c9b70c00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 29.678624] fff00000c9b70c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.678663] ==================================================================
[ 25.237755] ================================================================== [ 25.238734] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 25.239455] Read of size 1 at addr ffff888105aaaaa8 by task kunit_try_catch/237 [ 25.240024] [ 25.240146] CPU: 0 UID: 0 PID: 237 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT(voluntary) [ 25.240201] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.240214] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.240372] Call Trace: [ 25.240387] <TASK> [ 25.240420] dump_stack_lvl+0x73/0xb0 [ 25.240451] print_report+0xd1/0x650 [ 25.240475] ? __virt_addr_valid+0x1db/0x2d0 [ 25.240499] ? kmalloc_uaf2+0x4a8/0x520 [ 25.240519] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.240545] ? kmalloc_uaf2+0x4a8/0x520 [ 25.240566] kasan_report+0x141/0x180 [ 25.240587] ? kmalloc_uaf2+0x4a8/0x520 [ 25.240612] __asan_report_load1_noabort+0x18/0x20 [ 25.240637] kmalloc_uaf2+0x4a8/0x520 [ 25.240657] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 25.240677] ? finish_task_switch.isra.0+0x153/0x700 [ 25.240700] ? __switch_to+0x47/0xf50 [ 25.240728] ? __schedule+0x10cc/0x2b60 [ 25.240754] ? __pfx_read_tsc+0x10/0x10 [ 25.240776] ? ktime_get_ts64+0x86/0x230 [ 25.240802] kunit_try_run_case+0x1a5/0x480 [ 25.240829] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.240853] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.240879] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.240904] ? __kthread_parkme+0x82/0x180 [ 25.240925] ? preempt_count_sub+0x50/0x80 [ 25.240948] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.240973] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.240999] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.241023] kthread+0x337/0x6f0 [ 25.241044] ? trace_preempt_on+0x20/0xc0 [ 25.241069] ? __pfx_kthread+0x10/0x10 [ 25.241091] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.241114] ? calculate_sigpending+0x7b/0xa0 [ 25.241139] ? __pfx_kthread+0x10/0x10 [ 25.241173] ret_from_fork+0x116/0x1d0 [ 25.241193] ? __pfx_kthread+0x10/0x10 [ 25.241215] ret_from_fork_asm+0x1a/0x30 [ 25.241247] </TASK> [ 25.241260] [ 25.251581] Allocated by task 237: [ 25.251761] kasan_save_stack+0x45/0x70 [ 25.252117] kasan_save_track+0x18/0x40 [ 25.252502] kasan_save_alloc_info+0x3b/0x50 [ 25.252703] __kasan_kmalloc+0xb7/0xc0 [ 25.253090] __kmalloc_cache_noprof+0x189/0x420 [ 25.253437] kmalloc_uaf2+0xc6/0x520 [ 25.253771] kunit_try_run_case+0x1a5/0x480 [ 25.253979] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.254243] kthread+0x337/0x6f0 [ 25.254634] ret_from_fork+0x116/0x1d0 [ 25.254830] ret_from_fork_asm+0x1a/0x30 [ 25.255113] [ 25.255267] Freed by task 237: [ 25.255434] kasan_save_stack+0x45/0x70 [ 25.255637] kasan_save_track+0x18/0x40 [ 25.255840] kasan_save_free_info+0x3f/0x60 [ 25.256401] __kasan_slab_free+0x56/0x70 [ 25.256607] kfree+0x222/0x3f0 [ 25.256760] kmalloc_uaf2+0x14c/0x520 [ 25.257067] kunit_try_run_case+0x1a5/0x480 [ 25.257459] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.257722] kthread+0x337/0x6f0 [ 25.258062] ret_from_fork+0x116/0x1d0 [ 25.258249] ret_from_fork_asm+0x1a/0x30 [ 25.258597] [ 25.258698] The buggy address belongs to the object at ffff888105aaaa80 [ 25.258698] which belongs to the cache kmalloc-64 of size 64 [ 25.259466] The buggy address is located 40 bytes inside of [ 25.259466] freed 64-byte region [ffff888105aaaa80, ffff888105aaaac0) [ 25.259976] [ 25.260571] The buggy address belongs to the physical page: [ 25.260829] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105aaa [ 25.261343] flags: 0x200000000000000(node=0|zone=2) [ 25.261584] page_type: f5(slab) [ 25.261932] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 25.262474] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 25.262897] page dumped because: kasan: bad access detected [ 25.263132] [ 25.263202] Memory state around the buggy address: [ 25.263650] ffff888105aaa980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 25.264040] ffff888105aaaa00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 25.264534] >ffff888105aaaa80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 25.264844] ^ [ 25.265054] ffff888105aaab00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 25.265409] ffff888105aaab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.265722] ==================================================================