Date
July 4, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 29.656152] ================================================================== [ 29.656212] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x300/0x338 [ 29.656262] Read of size 1 at addr fff00000c5a48a28 by task kunit_try_catch/217 [ 29.656311] [ 29.656341] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT [ 29.656426] Tainted: [B]=BAD_PAGE, [N]=TEST [ 29.656452] Hardware name: linux,dummy-virt (DT) [ 29.656484] Call trace: [ 29.656507] show_stack+0x20/0x38 (C) [ 29.656554] dump_stack_lvl+0x8c/0xd0 [ 29.656597] print_report+0x118/0x608 [ 29.656644] kasan_report+0xdc/0x128 [ 29.656688] __asan_report_load1_noabort+0x20/0x30 [ 29.656735] kmalloc_uaf+0x300/0x338 [ 29.656779] kunit_try_run_case+0x170/0x3f0 [ 29.656833] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.656886] kthread+0x328/0x630 [ 29.656940] ret_from_fork+0x10/0x20 [ 29.656988] [ 29.657040] Allocated by task 217: [ 29.657080] kasan_save_stack+0x3c/0x68 [ 29.657133] kasan_save_track+0x20/0x40 [ 29.657172] kasan_save_alloc_info+0x40/0x58 [ 29.657210] __kasan_kmalloc+0xd4/0xd8 [ 29.657246] __kmalloc_cache_noprof+0x16c/0x3c0 [ 29.657286] kmalloc_uaf+0xb8/0x338 [ 29.657322] kunit_try_run_case+0x170/0x3f0 [ 29.657359] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.657414] kthread+0x328/0x630 [ 29.657446] ret_from_fork+0x10/0x20 [ 29.657486] [ 29.657507] Freed by task 217: [ 29.657533] kasan_save_stack+0x3c/0x68 [ 29.657571] kasan_save_track+0x20/0x40 [ 29.657608] kasan_save_free_info+0x4c/0x78 [ 29.657645] __kasan_slab_free+0x6c/0x98 [ 29.657683] kfree+0x214/0x3c8 [ 29.657716] kmalloc_uaf+0x11c/0x338 [ 29.657752] kunit_try_run_case+0x170/0x3f0 [ 29.657790] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.657835] kthread+0x328/0x630 [ 29.657869] ret_from_fork+0x10/0x20 [ 29.657915] [ 29.657933] The buggy address belongs to the object at fff00000c5a48a20 [ 29.657933] which belongs to the cache kmalloc-16 of size 16 [ 29.657990] The buggy address is located 8 bytes inside of [ 29.657990] freed 16-byte region [fff00000c5a48a20, fff00000c5a48a30) [ 29.658050] [ 29.658071] The buggy address belongs to the physical page: [ 29.658111] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105a48 [ 29.658163] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 29.658216] page_type: f5(slab) [ 29.658253] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 29.658302] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 29.658343] page dumped because: kasan: bad access detected [ 29.658375] [ 29.658408] Memory state around the buggy address: [ 29.658441] fff00000c5a48900: fa fb fc fc fa fb fc fc fa fb fc fc 00 04 fc fc [ 29.658484] fff00000c5a48980: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 29.658526] >fff00000c5a48a00: fa fb fc fc fa fb fc fc fc fc fc fc fc fc fc fc [ 29.658564] ^ [ 29.658595] fff00000c5a48a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.658637] fff00000c5a48b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.658674] ==================================================================
[ 25.164676] ================================================================== [ 25.165255] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380 [ 25.165735] Read of size 1 at addr ffff888102b9b568 by task kunit_try_catch/233 [ 25.166133] [ 25.166332] CPU: 0 UID: 0 PID: 233 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT(voluntary) [ 25.166399] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.166412] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.166436] Call Trace: [ 25.166449] <TASK> [ 25.166480] dump_stack_lvl+0x73/0xb0 [ 25.166511] print_report+0xd1/0x650 [ 25.166535] ? __virt_addr_valid+0x1db/0x2d0 [ 25.166573] ? kmalloc_uaf+0x320/0x380 [ 25.166593] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.166619] ? kmalloc_uaf+0x320/0x380 [ 25.166649] kasan_report+0x141/0x180 [ 25.166672] ? kmalloc_uaf+0x320/0x380 [ 25.166697] __asan_report_load1_noabort+0x18/0x20 [ 25.166733] kmalloc_uaf+0x320/0x380 [ 25.166754] ? __pfx_kmalloc_uaf+0x10/0x10 [ 25.166775] ? __schedule+0x10cc/0x2b60 [ 25.166801] ? __pfx_read_tsc+0x10/0x10 [ 25.166824] ? ktime_get_ts64+0x86/0x230 [ 25.166851] kunit_try_run_case+0x1a5/0x480 [ 25.166878] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.166904] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.166929] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.166954] ? __kthread_parkme+0x82/0x180 [ 25.166976] ? preempt_count_sub+0x50/0x80 [ 25.167000] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.167026] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.167051] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.167077] kthread+0x337/0x6f0 [ 25.167107] ? trace_preempt_on+0x20/0xc0 [ 25.167132] ? __pfx_kthread+0x10/0x10 [ 25.167154] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.167188] ? calculate_sigpending+0x7b/0xa0 [ 25.167213] ? __pfx_kthread+0x10/0x10 [ 25.167236] ret_from_fork+0x116/0x1d0 [ 25.167268] ? __pfx_kthread+0x10/0x10 [ 25.167289] ret_from_fork_asm+0x1a/0x30 [ 25.167322] </TASK> [ 25.167335] [ 25.179293] Allocated by task 233: [ 25.179489] kasan_save_stack+0x45/0x70 [ 25.179687] kasan_save_track+0x18/0x40 [ 25.179873] kasan_save_alloc_info+0x3b/0x50 [ 25.180724] __kasan_kmalloc+0xb7/0xc0 [ 25.181069] __kmalloc_cache_noprof+0x189/0x420 [ 25.181611] kmalloc_uaf+0xaa/0x380 [ 25.181804] kunit_try_run_case+0x1a5/0x480 [ 25.182331] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.182799] kthread+0x337/0x6f0 [ 25.183387] ret_from_fork+0x116/0x1d0 [ 25.183686] ret_from_fork_asm+0x1a/0x30 [ 25.184061] [ 25.184477] Freed by task 233: [ 25.184646] kasan_save_stack+0x45/0x70 [ 25.184833] kasan_save_track+0x18/0x40 [ 25.185475] kasan_save_free_info+0x3f/0x60 [ 25.185777] __kasan_slab_free+0x56/0x70 [ 25.186327] kfree+0x222/0x3f0 [ 25.186583] kmalloc_uaf+0x12c/0x380 [ 25.186757] kunit_try_run_case+0x1a5/0x480 [ 25.187203] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.187658] kthread+0x337/0x6f0 [ 25.188134] ret_from_fork+0x116/0x1d0 [ 25.188721] ret_from_fork_asm+0x1a/0x30 [ 25.189181] [ 25.189412] The buggy address belongs to the object at ffff888102b9b560 [ 25.189412] which belongs to the cache kmalloc-16 of size 16 [ 25.190502] The buggy address is located 8 bytes inside of [ 25.190502] freed 16-byte region [ffff888102b9b560, ffff888102b9b570) [ 25.191463] [ 25.191663] The buggy address belongs to the physical page: [ 25.192368] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b9b [ 25.192818] flags: 0x200000000000000(node=0|zone=2) [ 25.193550] page_type: f5(slab) [ 25.194202] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 25.194555] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 25.194854] page dumped because: kasan: bad access detected [ 25.195086] [ 25.195796] Memory state around the buggy address: [ 25.196136] ffff888102b9b400: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.196918] ffff888102b9b480: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.198168] >ffff888102b9b500: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.198598] ^ [ 25.198879] ffff888102b9b580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.199472] ffff888102b9b600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.199940] ==================================================================