Date
July 23, 2025, 2:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.521707] ================================================================== [ 15.521769] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x300/0x338 [ 15.522515] Read of size 1 at addr fff00000c3ec4148 by task kunit_try_catch/184 [ 15.522886] [ 15.522957] CPU: 1 UID: 0 PID: 184 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7 #1 PREEMPT [ 15.523056] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.523082] Hardware name: linux,dummy-virt (DT) [ 15.523131] Call trace: [ 15.523163] show_stack+0x20/0x38 (C) [ 15.523225] dump_stack_lvl+0x8c/0xd0 [ 15.523277] print_report+0x118/0x5d0 [ 15.523332] kasan_report+0xdc/0x128 [ 15.523378] __asan_report_load1_noabort+0x20/0x30 [ 15.523430] kmalloc_uaf+0x300/0x338 [ 15.523471] kunit_try_run_case+0x170/0x3f0 [ 15.523518] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.523569] kthread+0x328/0x630 [ 15.523618] ret_from_fork+0x10/0x20 [ 15.523667] [ 15.523686] Allocated by task 184: [ 15.523727] kasan_save_stack+0x3c/0x68 [ 15.523768] kasan_save_track+0x20/0x40 [ 15.523804] kasan_save_alloc_info+0x40/0x58 [ 15.523846] __kasan_kmalloc+0xd4/0xd8 [ 15.523897] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.523937] kmalloc_uaf+0xb8/0x338 [ 15.523987] kunit_try_run_case+0x170/0x3f0 [ 15.524035] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.524082] kthread+0x328/0x630 [ 15.524120] ret_from_fork+0x10/0x20 [ 15.524176] [ 15.524195] Freed by task 184: [ 15.524222] kasan_save_stack+0x3c/0x68 [ 15.524266] kasan_save_track+0x20/0x40 [ 15.524304] kasan_save_free_info+0x4c/0x78 [ 15.524352] __kasan_slab_free+0x6c/0x98 [ 15.524390] kfree+0x214/0x3c8 [ 15.524434] kmalloc_uaf+0x11c/0x338 [ 15.524477] kunit_try_run_case+0x170/0x3f0 [ 15.524516] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.524570] kthread+0x328/0x630 [ 15.524614] ret_from_fork+0x10/0x20 [ 15.524650] [ 15.524671] The buggy address belongs to the object at fff00000c3ec4140 [ 15.524671] which belongs to the cache kmalloc-16 of size 16 [ 15.524731] The buggy address is located 8 bytes inside of [ 15.524731] freed 16-byte region [fff00000c3ec4140, fff00000c3ec4150) [ 15.524797] [ 15.524834] The buggy address belongs to the physical page: [ 15.525168] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103ec4 [ 15.525474] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.525958] page_type: f5(slab) [ 15.526364] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.526441] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.526514] page dumped because: kasan: bad access detected [ 15.526580] [ 15.526635] Memory state around the buggy address: [ 15.526878] fff00000c3ec4000: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.526946] fff00000c3ec4080: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.527230] >fff00000c3ec4100: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 15.527302] ^ [ 15.527779] fff00000c3ec4180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.527938] fff00000c3ec4200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.528016] ==================================================================
[ 12.833467] ================================================================== [ 12.834430] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380 [ 12.834754] Read of size 1 at addr ffff888102261f88 by task kunit_try_catch/201 [ 12.835075] [ 12.835197] CPU: 0 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7 #1 PREEMPT(voluntary) [ 12.835239] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.835250] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.835270] Call Trace: [ 12.835281] <TASK> [ 12.835295] dump_stack_lvl+0x73/0xb0 [ 12.835323] print_report+0xd1/0x610 [ 12.835344] ? __virt_addr_valid+0x1db/0x2d0 [ 12.835366] ? kmalloc_uaf+0x320/0x380 [ 12.835385] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.835406] ? kmalloc_uaf+0x320/0x380 [ 12.835425] kasan_report+0x141/0x180 [ 12.835446] ? kmalloc_uaf+0x320/0x380 [ 12.835470] __asan_report_load1_noabort+0x18/0x20 [ 12.835493] kmalloc_uaf+0x320/0x380 [ 12.835513] ? __pfx_kmalloc_uaf+0x10/0x10 [ 12.835533] ? __schedule+0x10c6/0x2b60 [ 12.835555] ? __pfx_read_tsc+0x10/0x10 [ 12.835574] ? ktime_get_ts64+0x86/0x230 [ 12.835597] kunit_try_run_case+0x1a5/0x480 [ 12.835621] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.835643] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.835666] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.835688] ? __kthread_parkme+0x82/0x180 [ 12.835708] ? preempt_count_sub+0x50/0x80 [ 12.835731] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.835754] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.835776] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.835799] kthread+0x337/0x6f0 [ 12.835830] ? trace_preempt_on+0x20/0xc0 [ 12.835852] ? __pfx_kthread+0x10/0x10 [ 12.835872] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.835893] ? calculate_sigpending+0x7b/0xa0 [ 12.835916] ? __pfx_kthread+0x10/0x10 [ 12.835937] ret_from_fork+0x116/0x1d0 [ 12.835955] ? __pfx_kthread+0x10/0x10 [ 12.835975] ret_from_fork_asm+0x1a/0x30 [ 12.836003] </TASK> [ 12.836013] [ 12.842738] Allocated by task 201: [ 12.842927] kasan_save_stack+0x45/0x70 [ 12.843395] kasan_save_track+0x18/0x40 [ 12.843582] kasan_save_alloc_info+0x3b/0x50 [ 12.843775] __kasan_kmalloc+0xb7/0xc0 [ 12.843972] __kmalloc_cache_noprof+0x189/0x420 [ 12.844193] kmalloc_uaf+0xaa/0x380 [ 12.844389] kunit_try_run_case+0x1a5/0x480 [ 12.844541] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.844718] kthread+0x337/0x6f0 [ 12.844857] ret_from_fork+0x116/0x1d0 [ 12.844994] ret_from_fork_asm+0x1a/0x30 [ 12.845215] [ 12.845310] Freed by task 201: [ 12.845581] kasan_save_stack+0x45/0x70 [ 12.846017] kasan_save_track+0x18/0x40 [ 12.846173] kasan_save_free_info+0x3f/0x60 [ 12.846364] __kasan_slab_free+0x56/0x70 [ 12.846503] kfree+0x222/0x3f0 [ 12.846621] kmalloc_uaf+0x12c/0x380 [ 12.846924] kunit_try_run_case+0x1a5/0x480 [ 12.847150] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.847549] kthread+0x337/0x6f0 [ 12.847730] ret_from_fork+0x116/0x1d0 [ 12.847935] ret_from_fork_asm+0x1a/0x30 [ 12.848188] [ 12.848287] The buggy address belongs to the object at ffff888102261f80 [ 12.848287] which belongs to the cache kmalloc-16 of size 16 [ 12.848669] The buggy address is located 8 bytes inside of [ 12.848669] freed 16-byte region [ffff888102261f80, ffff888102261f90) [ 12.850758] [ 12.851141] The buggy address belongs to the physical page: [ 12.852012] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102261 [ 12.852771] flags: 0x200000000000000(node=0|zone=2) [ 12.852961] page_type: f5(slab) [ 12.853090] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 12.853316] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 12.853535] page dumped because: kasan: bad access detected [ 12.853702] [ 12.853772] Memory state around the buggy address: [ 12.853937] ffff888102261e80: 00 02 fc fc 00 02 fc fc 00 02 fc fc fa fb fc fc [ 12.854151] ffff888102261f00: fa fb fc fc fa fb fc fc 00 05 fc fc fa fb fc fc [ 12.854361] >ffff888102261f80: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.854574] ^ [ 12.854700] ffff888102262000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.855253] ffff888102262080: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb [ 12.856055] ==================================================================