Date
July 9, 2025, 1:08 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 29.464095] ================================================================== [ 29.464202] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 29.464304] Read of size 1 at addr fff00000c598ce28 by task kunit_try_catch/220 [ 29.464355] [ 29.464423] CPU: 0 UID: 0 PID: 220 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5-next-20250709 #1 PREEMPT [ 29.464509] Tainted: [B]=BAD_PAGE, [N]=TEST [ 29.464717] Hardware name: linux,dummy-virt (DT) [ 29.464761] Call trace: [ 29.464803] show_stack+0x20/0x38 (C) [ 29.464894] dump_stack_lvl+0x8c/0xd0 [ 29.464948] print_report+0x118/0x5d0 [ 29.465013] kasan_report+0xdc/0x128 [ 29.465089] __asan_report_load1_noabort+0x20/0x30 [ 29.465139] kmalloc_uaf2+0x3f4/0x468 [ 29.465184] kunit_try_run_case+0x170/0x3f0 [ 29.465236] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.465292] kthread+0x328/0x630 [ 29.465334] ret_from_fork+0x10/0x20 [ 29.465382] [ 29.465400] Allocated by task 220: [ 29.465429] kasan_save_stack+0x3c/0x68 [ 29.465469] kasan_save_track+0x20/0x40 [ 29.465508] kasan_save_alloc_info+0x40/0x58 [ 29.465544] __kasan_kmalloc+0xd4/0xd8 [ 29.465581] __kmalloc_cache_noprof+0x16c/0x3c0 [ 29.465767] kmalloc_uaf2+0xc4/0x468 [ 29.465850] kunit_try_run_case+0x170/0x3f0 [ 29.465891] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.465962] kthread+0x328/0x630 [ 29.466011] ret_from_fork+0x10/0x20 [ 29.466101] [ 29.466159] Freed by task 220: [ 29.466226] kasan_save_stack+0x3c/0x68 [ 29.466265] kasan_save_track+0x20/0x40 [ 29.466329] kasan_save_free_info+0x4c/0x78 [ 29.466395] __kasan_slab_free+0x6c/0x98 [ 29.466488] kfree+0x214/0x3c8 [ 29.466522] kmalloc_uaf2+0x134/0x468 [ 29.466588] kunit_try_run_case+0x170/0x3f0 [ 29.466806] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.466919] kthread+0x328/0x630 [ 29.466955] ret_from_fork+0x10/0x20 [ 29.467046] [ 29.467097] The buggy address belongs to the object at fff00000c598ce00 [ 29.467097] which belongs to the cache kmalloc-64 of size 64 [ 29.467162] The buggy address is located 40 bytes inside of [ 29.467162] freed 64-byte region [fff00000c598ce00, fff00000c598ce40) [ 29.467223] [ 29.467282] The buggy address belongs to the physical page: [ 29.467340] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10598c [ 29.467394] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 29.467468] page_type: f5(slab) [ 29.467556] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 29.467607] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 29.467648] page dumped because: kasan: bad access detected [ 29.467679] [ 29.467696] Memory state around the buggy address: [ 29.467766] fff00000c598cd00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 29.467948] fff00000c598cd80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 29.468093] >fff00000c598ce00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 29.468133] ^ [ 29.468197] fff00000c598ce80: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 29.468240] fff00000c598cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.468277] ==================================================================
[ 24.396082] ================================================================== [ 24.396541] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 24.396821] Read of size 1 at addr ffff8881053b3ca8 by task kunit_try_catch/238 [ 24.397755] [ 24.398003] CPU: 1 UID: 0 PID: 238 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc5-next-20250709 #1 PREEMPT(voluntary) [ 24.398075] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 24.398090] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 24.398112] Call Trace: [ 24.398126] <TASK> [ 24.398146] dump_stack_lvl+0x73/0xb0 [ 24.398179] print_report+0xd1/0x610 [ 24.398201] ? __virt_addr_valid+0x1db/0x2d0 [ 24.398225] ? kmalloc_uaf2+0x4a8/0x520 [ 24.398244] ? kasan_complete_mode_report_info+0x64/0x200 [ 24.398269] ? kmalloc_uaf2+0x4a8/0x520 [ 24.398288] kasan_report+0x141/0x180 [ 24.398309] ? kmalloc_uaf2+0x4a8/0x520 [ 24.398333] __asan_report_load1_noabort+0x18/0x20 [ 24.398356] kmalloc_uaf2+0x4a8/0x520 [ 24.398375] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 24.398394] ? finish_task_switch.isra.0+0x153/0x700 [ 24.398416] ? __switch_to+0x47/0xf80 [ 24.398441] ? __schedule+0x10cc/0x2b60 [ 24.398464] ? __pfx_read_tsc+0x10/0x10 [ 24.398485] ? ktime_get_ts64+0x86/0x230 [ 24.398510] kunit_try_run_case+0x1a5/0x480 [ 24.398539] ? __pfx_kunit_try_run_case+0x10/0x10 [ 24.398559] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 24.398581] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 24.398605] ? __kthread_parkme+0x82/0x180 [ 24.398625] ? preempt_count_sub+0x50/0x80 [ 24.398647] ? __pfx_kunit_try_run_case+0x10/0x10 [ 24.398668] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.398703] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 24.398728] kthread+0x337/0x6f0 [ 24.398798] ? trace_preempt_on+0x20/0xc0 [ 24.398823] ? __pfx_kthread+0x10/0x10 [ 24.398865] ? _raw_spin_unlock_irq+0x47/0x80 [ 24.398887] ? calculate_sigpending+0x7b/0xa0 [ 24.398911] ? __pfx_kthread+0x10/0x10 [ 24.398932] ret_from_fork+0x116/0x1d0 [ 24.398963] ? __pfx_kthread+0x10/0x10 [ 24.398983] ret_from_fork_asm+0x1a/0x30 [ 24.399015] </TASK> [ 24.399027] [ 24.414717] Allocated by task 238: [ 24.415169] kasan_save_stack+0x45/0x70 [ 24.415569] kasan_save_track+0x18/0x40 [ 24.416045] kasan_save_alloc_info+0x3b/0x50 [ 24.416479] __kasan_kmalloc+0xb7/0xc0 [ 24.416898] __kmalloc_cache_noprof+0x189/0x420 [ 24.417414] kmalloc_uaf2+0xc6/0x520 [ 24.417806] kunit_try_run_case+0x1a5/0x480 [ 24.418271] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.419019] kthread+0x337/0x6f0 [ 24.419373] ret_from_fork+0x116/0x1d0 [ 24.419750] ret_from_fork_asm+0x1a/0x30 [ 24.420228] [ 24.420417] Freed by task 238: [ 24.420680] kasan_save_stack+0x45/0x70 [ 24.420939] kasan_save_track+0x18/0x40 [ 24.421407] kasan_save_free_info+0x3f/0x60 [ 24.421556] __kasan_slab_free+0x56/0x70 [ 24.421684] kfree+0x222/0x3f0 [ 24.421827] kmalloc_uaf2+0x14c/0x520 [ 24.422300] kunit_try_run_case+0x1a5/0x480 [ 24.422729] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.423411] kthread+0x337/0x6f0 [ 24.423743] ret_from_fork+0x116/0x1d0 [ 24.424334] ret_from_fork_asm+0x1a/0x30 [ 24.424593] [ 24.424661] The buggy address belongs to the object at ffff8881053b3c80 [ 24.424661] which belongs to the cache kmalloc-64 of size 64 [ 24.425682] The buggy address is located 40 bytes inside of [ 24.425682] freed 64-byte region [ffff8881053b3c80, ffff8881053b3cc0) [ 24.426455] [ 24.426534] The buggy address belongs to the physical page: [ 24.426715] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1053b3 [ 24.426967] flags: 0x200000000000000(node=0|zone=2) [ 24.427395] page_type: f5(slab) [ 24.427551] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 24.427820] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 24.428321] page dumped because: kasan: bad access detected [ 24.428735] [ 24.428936] Memory state around the buggy address: [ 24.429251] ffff8881053b3b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 24.429544] ffff8881053b3c00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 24.429843] >ffff8881053b3c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 24.430439] ^ [ 24.430675] ffff8881053b3d00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 24.431062] ffff8881053b3d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.431379] ==================================================================