Date
July 17, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.472808] ================================================================== [ 15.472873] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x300/0x338 [ 15.473071] Read of size 1 at addr fff00000c433ec48 by task kunit_try_catch/185 [ 15.473298] [ 15.473366] CPU: 0 UID: 0 PID: 185 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.473518] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.473567] Hardware name: linux,dummy-virt (DT) [ 15.473674] Call trace: [ 15.473714] show_stack+0x20/0x38 (C) [ 15.473824] dump_stack_lvl+0x8c/0xd0 [ 15.474161] print_report+0x118/0x5d0 [ 15.474253] kasan_report+0xdc/0x128 [ 15.474391] __asan_report_load1_noabort+0x20/0x30 [ 15.474614] kmalloc_uaf+0x300/0x338 [ 15.474759] kunit_try_run_case+0x170/0x3f0 [ 15.474923] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.475076] kthread+0x328/0x630 [ 15.475181] ret_from_fork+0x10/0x20 [ 15.475522] [ 15.475578] Allocated by task 185: [ 15.475610] kasan_save_stack+0x3c/0x68 [ 15.475816] kasan_save_track+0x20/0x40 [ 15.475864] kasan_save_alloc_info+0x40/0x58 [ 15.476111] __kasan_kmalloc+0xd4/0xd8 [ 15.476247] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.476359] kmalloc_uaf+0xb8/0x338 [ 15.476394] kunit_try_run_case+0x170/0x3f0 [ 15.476433] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.476499] kthread+0x328/0x630 [ 15.476531] ret_from_fork+0x10/0x20 [ 15.476576] [ 15.476605] Freed by task 185: [ 15.476652] kasan_save_stack+0x3c/0x68 [ 15.476689] kasan_save_track+0x20/0x40 [ 15.476726] kasan_save_free_info+0x4c/0x78 [ 15.476923] __kasan_slab_free+0x6c/0x98 [ 15.477147] kfree+0x214/0x3c8 [ 15.477262] kmalloc_uaf+0x11c/0x338 [ 15.477299] kunit_try_run_case+0x170/0x3f0 [ 15.477335] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.477386] kthread+0x328/0x630 [ 15.477581] ret_from_fork+0x10/0x20 [ 15.477629] [ 15.477650] The buggy address belongs to the object at fff00000c433ec40 [ 15.477650] which belongs to the cache kmalloc-16 of size 16 [ 15.477875] The buggy address is located 8 bytes inside of [ 15.477875] freed 16-byte region [fff00000c433ec40, fff00000c433ec50) [ 15.478087] [ 15.478109] The buggy address belongs to the physical page: [ 15.478143] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10433e [ 15.478389] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.478493] page_type: f5(slab) [ 15.478743] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.479138] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.479299] page dumped because: kasan: bad access detected [ 15.479345] [ 15.479363] Memory state around the buggy address: [ 15.479441] fff00000c433eb00: 00 07 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.479695] fff00000c433eb80: 00 04 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.479855] >fff00000c433ec00: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 15.479976] ^ [ 15.480046] fff00000c433ec80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.480090] fff00000c433ed00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.480249] ==================================================================
[ 13.293660] ================================================================== [ 13.294162] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380 [ 13.294814] Read of size 1 at addr ffff88810254a288 by task kunit_try_catch/201 [ 13.295142] [ 13.295240] CPU: 1 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 13.295283] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.295294] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.295314] Call Trace: [ 13.295325] <TASK> [ 13.295338] dump_stack_lvl+0x73/0xb0 [ 13.295367] print_report+0xd1/0x610 [ 13.295389] ? __virt_addr_valid+0x1db/0x2d0 [ 13.295411] ? kmalloc_uaf+0x320/0x380 [ 13.295430] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.295453] ? kmalloc_uaf+0x320/0x380 [ 13.295518] kasan_report+0x141/0x180 [ 13.295541] ? kmalloc_uaf+0x320/0x380 [ 13.295620] __asan_report_load1_noabort+0x18/0x20 [ 13.295646] kmalloc_uaf+0x320/0x380 [ 13.295666] ? __pfx_kmalloc_uaf+0x10/0x10 [ 13.295686] ? sysvec_apic_timer_interrupt+0x50/0x90 [ 13.295712] ? trace_hardirqs_on+0x37/0xe0 [ 13.295735] ? __pfx_read_tsc+0x10/0x10 [ 13.295755] ? ktime_get_ts64+0x86/0x230 [ 13.295778] kunit_try_run_case+0x1a5/0x480 [ 13.295802] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.295827] ? queued_spin_lock_slowpath+0x116/0xb40 [ 13.295852] ? __kthread_parkme+0x82/0x180 [ 13.295872] ? preempt_count_sub+0x50/0x80 [ 13.295895] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.295919] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.295944] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.295969] kthread+0x337/0x6f0 [ 13.295988] ? trace_preempt_on+0x20/0xc0 [ 13.296010] ? __pfx_kthread+0x10/0x10 [ 13.296030] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.296056] ? calculate_sigpending+0x7b/0xa0 [ 13.296080] ? __pfx_kthread+0x10/0x10 [ 13.296101] ret_from_fork+0x116/0x1d0 [ 13.296120] ? __pfx_kthread+0x10/0x10 [ 13.296140] ret_from_fork_asm+0x1a/0x30 [ 13.296171] </TASK> [ 13.296181] [ 13.303799] Allocated by task 201: [ 13.303998] kasan_save_stack+0x45/0x70 [ 13.304260] kasan_save_track+0x18/0x40 [ 13.304812] kasan_save_alloc_info+0x3b/0x50 [ 13.304985] __kasan_kmalloc+0xb7/0xc0 [ 13.305117] __kmalloc_cache_noprof+0x189/0x420 [ 13.305442] kmalloc_uaf+0xaa/0x380 [ 13.305625] kunit_try_run_case+0x1a5/0x480 [ 13.305862] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.306098] kthread+0x337/0x6f0 [ 13.306223] ret_from_fork+0x116/0x1d0 [ 13.306459] ret_from_fork_asm+0x1a/0x30 [ 13.306669] [ 13.306782] Freed by task 201: [ 13.306936] kasan_save_stack+0x45/0x70 [ 13.307086] kasan_save_track+0x18/0x40 [ 13.307221] kasan_save_free_info+0x3f/0x60 [ 13.307615] __kasan_slab_free+0x56/0x70 [ 13.307813] kfree+0x222/0x3f0 [ 13.307962] kmalloc_uaf+0x12c/0x380 [ 13.308128] kunit_try_run_case+0x1a5/0x480 [ 13.308274] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.308642] kthread+0x337/0x6f0 [ 13.308840] ret_from_fork+0x116/0x1d0 [ 13.309025] ret_from_fork_asm+0x1a/0x30 [ 13.309211] [ 13.309499] The buggy address belongs to the object at ffff88810254a280 [ 13.309499] which belongs to the cache kmalloc-16 of size 16 [ 13.310033] The buggy address is located 8 bytes inside of [ 13.310033] freed 16-byte region [ffff88810254a280, ffff88810254a290) [ 13.310661] [ 13.310762] The buggy address belongs to the physical page: [ 13.311015] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10254a [ 13.311463] flags: 0x200000000000000(node=0|zone=2) [ 13.311649] page_type: f5(slab) [ 13.311770] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 13.312000] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 13.312358] page dumped because: kasan: bad access detected [ 13.312682] [ 13.312784] Memory state around the buggy address: [ 13.313004] ffff88810254a180: 00 05 fc fc 00 02 fc fc 00 02 fc fc 00 02 fc fc [ 13.313341] ffff88810254a200: 00 02 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 13.313707] >ffff88810254a280: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.314011] ^ [ 13.314134] ffff88810254a300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.314354] ffff88810254a380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.314577] ==================================================================