Date
July 6, 2025, 11:09 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.240754] ================================================================== [ 18.240815] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 18.240889] Read of size 1 at addr fff00000c1cea960 by task kunit_try_catch/192 [ 18.240947] [ 18.240980] CPU: 1 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT [ 18.241060] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.241096] Hardware name: linux,dummy-virt (DT) [ 18.241127] Call trace: [ 18.241157] show_stack+0x20/0x38 (C) [ 18.241219] dump_stack_lvl+0x8c/0xd0 [ 18.241264] print_report+0x118/0x608 [ 18.241309] kasan_report+0xdc/0x128 [ 18.241364] __kasan_check_byte+0x54/0x70 [ 18.241411] kfree_sensitive+0x30/0xb0 [ 18.241807] kmalloc_double_kzfree+0x168/0x308 [ 18.242066] kunit_try_run_case+0x170/0x3f0 [ 18.242354] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.242419] kthread+0x328/0x630 [ 18.242465] ret_from_fork+0x10/0x20 [ 18.242520] [ 18.242541] Allocated by task 192: [ 18.242926] kasan_save_stack+0x3c/0x68 [ 18.243088] kasan_save_track+0x20/0x40 [ 18.243235] kasan_save_alloc_info+0x40/0x58 [ 18.243278] __kasan_kmalloc+0xd4/0xd8 [ 18.243366] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.243733] kmalloc_double_kzfree+0xb8/0x308 [ 18.243816] kunit_try_run_case+0x170/0x3f0 [ 18.243870] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.244065] kthread+0x328/0x630 [ 18.244268] ret_from_fork+0x10/0x20 [ 18.244356] [ 18.244404] Freed by task 192: [ 18.244432] kasan_save_stack+0x3c/0x68 [ 18.244664] kasan_save_track+0x20/0x40 [ 18.244880] kasan_save_free_info+0x4c/0x78 [ 18.244978] __kasan_slab_free+0x6c/0x98 [ 18.245107] kfree+0x214/0x3c8 [ 18.245545] kfree_sensitive+0x80/0xb0 [ 18.245691] kmalloc_double_kzfree+0x11c/0x308 [ 18.245736] kunit_try_run_case+0x170/0x3f0 [ 18.245801] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.245850] kthread+0x328/0x630 [ 18.246217] ret_from_fork+0x10/0x20 [ 18.246347] [ 18.246384] The buggy address belongs to the object at fff00000c1cea960 [ 18.246384] which belongs to the cache kmalloc-16 of size 16 [ 18.246729] The buggy address is located 0 bytes inside of [ 18.246729] freed 16-byte region [fff00000c1cea960, fff00000c1cea970) [ 18.247100] [ 18.247360] The buggy address belongs to the physical page: [ 18.247474] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101cea [ 18.247657] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.247748] page_type: f5(slab) [ 18.248028] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 18.248150] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 18.248297] page dumped because: kasan: bad access detected [ 18.248330] [ 18.248369] Memory state around the buggy address: [ 18.248689] fff00000c1cea800: fa fb fc fc 00 04 fc fc fa fb fc fc fa fb fc fc [ 18.248823] fff00000c1cea880: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 18.248905] >fff00000c1cea900: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 18.249160] ^ [ 18.249404] fff00000c1cea980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.249623] fff00000c1ceaa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.249794] ==================================================================
[ 11.907692] ================================================================== [ 11.908352] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 11.908952] Read of size 1 at addr ffff888101e8f4e0 by task kunit_try_catch/209 [ 11.909292] [ 11.909412] CPU: 0 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT(voluntary) [ 11.909458] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.909653] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.909678] Call Trace: [ 11.909690] <TASK> [ 11.909707] dump_stack_lvl+0x73/0xb0 [ 11.909739] print_report+0xd1/0x650 [ 11.909762] ? __virt_addr_valid+0x1db/0x2d0 [ 11.909786] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.909808] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.909829] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.909852] kasan_report+0x141/0x180 [ 11.909873] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.909898] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.909921] __kasan_check_byte+0x3d/0x50 [ 11.909956] kfree_sensitive+0x22/0x90 [ 11.909978] kmalloc_double_kzfree+0x19c/0x350 [ 11.910001] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 11.910024] ? __schedule+0x10cc/0x2b60 [ 11.910046] ? __pfx_read_tsc+0x10/0x10 [ 11.910067] ? ktime_get_ts64+0x86/0x230 [ 11.910092] kunit_try_run_case+0x1a5/0x480 [ 11.910116] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.910138] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.910161] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.910184] ? __kthread_parkme+0x82/0x180 [ 11.910205] ? preempt_count_sub+0x50/0x80 [ 11.910229] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.910253] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.910275] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.910298] kthread+0x337/0x6f0 [ 11.910317] ? trace_preempt_on+0x20/0xc0 [ 11.910339] ? __pfx_kthread+0x10/0x10 [ 11.910360] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.910380] ? calculate_sigpending+0x7b/0xa0 [ 11.910403] ? __pfx_kthread+0x10/0x10 [ 11.910424] ret_from_fork+0x116/0x1d0 [ 11.910442] ? __pfx_kthread+0x10/0x10 [ 11.910504] ret_from_fork_asm+0x1a/0x30 [ 11.910538] </TASK> [ 11.910549] [ 11.922653] Allocated by task 209: [ 11.922852] kasan_save_stack+0x45/0x70 [ 11.923255] kasan_save_track+0x18/0x40 [ 11.923499] kasan_save_alloc_info+0x3b/0x50 [ 11.923816] __kasan_kmalloc+0xb7/0xc0 [ 11.924192] __kmalloc_cache_noprof+0x189/0x420 [ 11.924419] kmalloc_double_kzfree+0xa9/0x350 [ 11.924953] kunit_try_run_case+0x1a5/0x480 [ 11.925198] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.925438] kthread+0x337/0x6f0 [ 11.925746] ret_from_fork+0x116/0x1d0 [ 11.926147] ret_from_fork_asm+0x1a/0x30 [ 11.926437] [ 11.926798] Freed by task 209: [ 11.927013] kasan_save_stack+0x45/0x70 [ 11.927238] kasan_save_track+0x18/0x40 [ 11.927423] kasan_save_free_info+0x3f/0x60 [ 11.927915] __kasan_slab_free+0x56/0x70 [ 11.928210] kfree+0x222/0x3f0 [ 11.928375] kfree_sensitive+0x67/0x90 [ 11.928759] kmalloc_double_kzfree+0x12b/0x350 [ 11.929251] kunit_try_run_case+0x1a5/0x480 [ 11.929640] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.929875] kthread+0x337/0x6f0 [ 11.930051] ret_from_fork+0x116/0x1d0 [ 11.930227] ret_from_fork_asm+0x1a/0x30 [ 11.930411] [ 11.930761] The buggy address belongs to the object at ffff888101e8f4e0 [ 11.930761] which belongs to the cache kmalloc-16 of size 16 [ 11.931760] The buggy address is located 0 bytes inside of [ 11.931760] freed 16-byte region [ffff888101e8f4e0, ffff888101e8f4f0) [ 11.932616] [ 11.932720] The buggy address belongs to the physical page: [ 11.932980] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101e8f [ 11.933768] flags: 0x200000000000000(node=0|zone=2) [ 11.934083] page_type: f5(slab) [ 11.934258] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 11.934736] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 11.935378] page dumped because: kasan: bad access detected [ 11.935898] [ 11.936138] Memory state around the buggy address: [ 11.936464] ffff888101e8f380: 00 02 fc fc 00 02 fc fc 00 02 fc fc fa fb fc fc [ 11.937177] ffff888101e8f400: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 11.937703] >ffff888101e8f480: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 11.938291] ^ [ 11.938760] ffff888101e8f500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.939263] ffff888101e8f580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.939775] ==================================================================