Date
July 8, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.295112] ================================================================== [ 31.295489] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 31.295807] Read of size 1 at addr fff00000c9acb728 by task kunit_try_catch/219 [ 31.295860] [ 31.295899] CPU: 0 UID: 0 PID: 219 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5-next-20250708 #1 PREEMPT [ 31.295988] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.296022] Hardware name: linux,dummy-virt (DT) [ 31.296159] Call trace: [ 31.296371] show_stack+0x20/0x38 (C) [ 31.296711] dump_stack_lvl+0x8c/0xd0 [ 31.297104] print_report+0x118/0x5d0 [ 31.297164] kasan_report+0xdc/0x128 [ 31.297226] __asan_report_load1_noabort+0x20/0x30 [ 31.297277] kmalloc_uaf2+0x3f4/0x468 [ 31.297383] kunit_try_run_case+0x170/0x3f0 [ 31.297916] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.297998] kthread+0x328/0x630 [ 31.298315] ret_from_fork+0x10/0x20 [ 31.298549] [ 31.298720] Allocated by task 219: [ 31.298775] kasan_save_stack+0x3c/0x68 [ 31.298839] kasan_save_track+0x20/0x40 [ 31.298902] kasan_save_alloc_info+0x40/0x58 [ 31.298940] __kasan_kmalloc+0xd4/0xd8 [ 31.298976] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.299017] kmalloc_uaf2+0xc4/0x468 [ 31.299054] kunit_try_run_case+0x170/0x3f0 [ 31.299390] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.299607] kthread+0x328/0x630 [ 31.299701] ret_from_fork+0x10/0x20 [ 31.299751] [ 31.299811] Freed by task 219: [ 31.299838] kasan_save_stack+0x3c/0x68 [ 31.299907] kasan_save_track+0x20/0x40 [ 31.300047] kasan_save_free_info+0x4c/0x78 [ 31.300084] __kasan_slab_free+0x6c/0x98 [ 31.300123] kfree+0x214/0x3c8 [ 31.300198] kmalloc_uaf2+0x134/0x468 [ 31.300251] kunit_try_run_case+0x170/0x3f0 [ 31.300290] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.300388] kthread+0x328/0x630 [ 31.300842] ret_from_fork+0x10/0x20 [ 31.300962] [ 31.300992] The buggy address belongs to the object at fff00000c9acb700 [ 31.300992] which belongs to the cache kmalloc-64 of size 64 [ 31.301071] The buggy address is located 40 bytes inside of [ 31.301071] freed 64-byte region [fff00000c9acb700, fff00000c9acb740) [ 31.301524] [ 31.301553] The buggy address belongs to the physical page: [ 31.301584] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109acb [ 31.301655] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.301709] page_type: f5(slab) [ 31.302086] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 31.302147] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 31.302231] page dumped because: kasan: bad access detected [ 31.302264] [ 31.302284] Memory state around the buggy address: [ 31.302480] fff00000c9acb600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.302758] fff00000c9acb680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.302803] >fff00000c9acb700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.302841] ^ [ 31.302874] fff00000c9acb780: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 31.303004] fff00000c9acb800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.303266] ==================================================================
[ 23.655210] ================================================================== [ 23.655734] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 23.656402] Read of size 1 at addr ffff8881062ac028 by task kunit_try_catch/236 [ 23.656738] [ 23.656837] CPU: 1 UID: 0 PID: 236 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5-next-20250708 #1 PREEMPT(voluntary) [ 23.656894] Tainted: [B]=BAD_PAGE, [N]=TEST [ 23.657252] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 23.657283] Call Trace: [ 23.657297] <TASK> [ 23.657319] dump_stack_lvl+0x73/0xb0 [ 23.657357] print_report+0xd1/0x610 [ 23.657382] ? __virt_addr_valid+0x1db/0x2d0 [ 23.657410] ? kmalloc_uaf2+0x4a8/0x520 [ 23.657430] ? kasan_complete_mode_report_info+0x64/0x200 [ 23.657458] ? kmalloc_uaf2+0x4a8/0x520 [ 23.657479] kasan_report+0x141/0x180 [ 23.657501] ? kmalloc_uaf2+0x4a8/0x520 [ 23.657526] __asan_report_load1_noabort+0x18/0x20 [ 23.657552] kmalloc_uaf2+0x4a8/0x520 [ 23.657573] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 23.657593] ? finish_task_switch.isra.0+0x153/0x700 [ 23.657617] ? __switch_to+0x47/0xf50 [ 23.657647] ? __schedule+0x10cc/0x2b60 [ 23.657677] ? __pfx_read_tsc+0x10/0x10 [ 23.657702] ? ktime_get_ts64+0x86/0x230 [ 23.657731] kunit_try_run_case+0x1a5/0x480 [ 23.657829] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.657857] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 23.657880] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 23.657909] ? __kthread_parkme+0x82/0x180 [ 23.657931] ? preempt_count_sub+0x50/0x80 [ 23.657954] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.657976] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.658004] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 23.658031] kthread+0x337/0x6f0 [ 23.658053] ? trace_preempt_on+0x20/0xc0 [ 23.658080] ? __pfx_kthread+0x10/0x10 [ 23.658104] ? _raw_spin_unlock_irq+0x47/0x80 [ 23.658131] ? calculate_sigpending+0x7b/0xa0 [ 23.658159] ? __pfx_kthread+0x10/0x10 [ 23.658183] ret_from_fork+0x116/0x1d0 [ 23.658202] ? __pfx_kthread+0x10/0x10 [ 23.658225] ret_from_fork_asm+0x1a/0x30 [ 23.658272] </TASK> [ 23.658285] [ 23.665653] Allocated by task 236: [ 23.665800] kasan_save_stack+0x45/0x70 [ 23.665989] kasan_save_track+0x18/0x40 [ 23.666162] kasan_save_alloc_info+0x3b/0x50 [ 23.666317] __kasan_kmalloc+0xb7/0xc0 [ 23.666442] __kmalloc_cache_noprof+0x189/0x420 [ 23.666609] kmalloc_uaf2+0xc6/0x520 [ 23.666777] kunit_try_run_case+0x1a5/0x480 [ 23.666971] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.667320] kthread+0x337/0x6f0 [ 23.667488] ret_from_fork+0x116/0x1d0 [ 23.667614] ret_from_fork_asm+0x1a/0x30 [ 23.667748] [ 23.667811] Freed by task 236: [ 23.667914] kasan_save_stack+0x45/0x70 [ 23.668085] kasan_save_track+0x18/0x40 [ 23.668276] kasan_save_free_info+0x3f/0x60 [ 23.668610] __kasan_slab_free+0x56/0x70 [ 23.668816] kfree+0x222/0x3f0 [ 23.669313] kmalloc_uaf2+0x14c/0x520 [ 23.669478] kunit_try_run_case+0x1a5/0x480 [ 23.669646] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.670000] kthread+0x337/0x6f0 [ 23.670124] ret_from_fork+0x116/0x1d0 [ 23.670263] ret_from_fork_asm+0x1a/0x30 [ 23.670397] [ 23.670463] The buggy address belongs to the object at ffff8881062ac000 [ 23.670463] which belongs to the cache kmalloc-64 of size 64 [ 23.671312] The buggy address is located 40 bytes inside of [ 23.671312] freed 64-byte region [ffff8881062ac000, ffff8881062ac040) [ 23.671832] [ 23.671923] The buggy address belongs to the physical page: [ 23.672093] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1062ac [ 23.672477] flags: 0x200000000000000(node=0|zone=2) [ 23.672719] page_type: f5(slab) [ 23.673035] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 23.673277] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 23.673856] page dumped because: kasan: bad access detected [ 23.674130] [ 23.674219] Memory state around the buggy address: [ 23.674453] ffff8881062abf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.674730] ffff8881062abf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.675112] >ffff8881062ac000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 23.675359] ^ [ 23.675503] ffff8881062ac080: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 23.675878] ffff8881062ac100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.676193] ==================================================================