Hay
Date
March 19, 2025, 10:35 a.m.

Environment
qemu-arm64
qemu-x86_64

[   34.548774] ==================================================================
[   34.549098] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468
[   34.549255] Read of size 1 at addr fff00000c5d89da8 by task kunit_try_catch/190
[   34.549420] 
[   34.549510] CPU: 1 UID: 0 PID: 190 Comm: kunit_try_catch Tainted: G    B            N  6.14.0-rc7-next-20250319 #1 PREEMPT 
[   34.550110] Tainted: [B]=BAD_PAGE, [N]=TEST
[   34.550367] Hardware name: linux,dummy-virt (DT)
[   34.550610] Call trace:
[   34.550856]  show_stack+0x20/0x38 (C)
[   34.551196]  dump_stack_lvl+0x8c/0xd0
[   34.551467]  print_report+0x118/0x5f0
[   34.551980]  kasan_report+0xc8/0x118
[   34.552430]  __asan_report_load1_noabort+0x20/0x30
[   34.552699]  kmalloc_uaf2+0x3f4/0x468
[   34.553147]  kunit_try_run_case+0x14c/0x3d0
[   34.553660]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   34.554268]  kthread+0x318/0x618
[   34.554651]  ret_from_fork+0x10/0x20
[   34.555232] 
[   34.555323] Allocated by task 190:
[   34.555426]  kasan_save_stack+0x3c/0x68
[   34.555919]  kasan_save_track+0x20/0x40
[   34.556338]  kasan_save_alloc_info+0x40/0x58
[   34.557103]  __kasan_kmalloc+0xd4/0xd8
[   34.557225]  __kmalloc_cache_noprof+0x15c/0x3c0
[   34.557378]  kmalloc_uaf2+0xc4/0x468
[   34.557495]  kunit_try_run_case+0x14c/0x3d0
[   34.557624]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   34.557763]  kthread+0x318/0x618
[   34.557865]  ret_from_fork+0x10/0x20
[   34.558566] 
[   34.558643] Freed by task 190:
[   34.558895]  kasan_save_stack+0x3c/0x68
[   34.559047]  kasan_save_track+0x20/0x40
[   34.559191]  kasan_save_free_info+0x4c/0x78
[   34.559312]  __kasan_slab_free+0x6c/0x98
[   34.559572]  kfree+0x214/0x3c8
[   34.560012]  kmalloc_uaf2+0x134/0x468
[   34.560530]  kunit_try_run_case+0x14c/0x3d0
[   34.560688]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   34.560842]  kthread+0x318/0x618
[   34.561144]  ret_from_fork+0x10/0x20
[   34.561417] 
[   34.561482] The buggy address belongs to the object at fff00000c5d89d80
[   34.561482]  which belongs to the cache kmalloc-64 of size 64
[   34.561981] The buggy address is located 40 bytes inside of
[   34.561981]  freed 64-byte region [fff00000c5d89d80, fff00000c5d89dc0)
[   34.562613] 
[   34.562707] The buggy address belongs to the physical page:
[   34.562859] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105d89
[   34.563403] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   34.563590] page_type: f5(slab)
[   34.563712] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000
[   34.564264] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
[   34.564575] page dumped because: kasan: bad access detected
[   34.564986] 
[   34.565297] Memory state around the buggy address:
[   34.565546]  fff00000c5d89c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   34.565706]  fff00000c5d89d00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   34.565897] >fff00000c5d89d80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   34.566220]                                   ^
[   34.566496]  fff00000c5d89e00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc
[   34.566663]  fff00000c5d89e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   34.566793] ==================================================================

[   22.254347] ==================================================================
[   22.255659] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520
[   22.256608] Read of size 1 at addr ffff88810321e2a8 by task kunit_try_catch/209
[   22.257342] 
[   22.257545] CPU: 1 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G    B            N  6.14.0-rc7-next-20250319 #1 PREEMPT(voluntary) 
[   22.257615] Tainted: [B]=BAD_PAGE, [N]=TEST
[   22.257632] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   22.257661] Call Trace:
[   22.257679]  <TASK>
[   22.257700]  dump_stack_lvl+0x73/0xb0
[   22.258442]  print_report+0xd1/0x660
[   22.258540]  ? __virt_addr_valid+0x1db/0x2d0
[   22.258664]  ? kasan_complete_mode_report_info+0x64/0x200
[   22.258739]  kasan_report+0x104/0x140
[   22.258832]  ? kmalloc_uaf2+0x4a8/0x520
[   22.258873]  ? kmalloc_uaf2+0x4a8/0x520
[   22.258914]  __asan_report_load1_noabort+0x18/0x20
[   22.258946]  kmalloc_uaf2+0x4a8/0x520
[   22.258977]  ? __pfx_kmalloc_uaf2+0x10/0x10
[   22.259006]  ? irqentry_exit+0x2a/0x60
[   22.259038]  ? sysvec_apic_timer_interrupt+0x50/0x90
[   22.259073]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.259139]  ? __pfx_read_tsc+0x10/0x10
[   22.259172]  ? ktime_get_ts64+0x86/0x240
[   22.259210]  kunit_try_run_case+0x1b2/0x490
[   22.259244]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.259275]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   22.259307]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   22.259339]  ? __kthread_parkme+0x82/0x160
[   22.259369]  ? preempt_count_sub+0x50/0x80
[   22.259405]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.259439]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.259472]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   22.259504]  kthread+0x323/0x710
[   22.259533]  ? trace_preempt_on+0x20/0xc0
[   22.259567]  ? __pfx_kthread+0x10/0x10
[   22.259607]  ? _raw_spin_unlock_irq+0x47/0x80
[   22.259655]  ? calculate_sigpending+0x7b/0xa0
[   22.259687]  ? __pfx_kthread+0x10/0x10
[   22.259768]  ret_from_fork+0x41/0x80
[   22.259805]  ? __pfx_kthread+0x10/0x10
[   22.259838]  ret_from_fork_asm+0x1a/0x30
[   22.259886]  </TASK>
[   22.259902] 
[   22.277609] Allocated by task 209:
[   22.277842]  kasan_save_stack+0x3d/0x60
[   22.278330]  kasan_save_track+0x18/0x40
[   22.278806]  kasan_save_alloc_info+0x3b/0x50
[   22.279290]  __kasan_kmalloc+0xb7/0xc0
[   22.279869]  __kmalloc_cache_noprof+0x183/0x410
[   22.280211]  kmalloc_uaf2+0xc6/0x520
[   22.280472]  kunit_try_run_case+0x1b2/0x490
[   22.281421]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.282190]  kthread+0x323/0x710
[   22.282578]  ret_from_fork+0x41/0x80
[   22.283174]  ret_from_fork_asm+0x1a/0x30
[   22.283640] 
[   22.284081] Freed by task 209:
[   22.284325]  kasan_save_stack+0x3d/0x60
[   22.284597]  kasan_save_track+0x18/0x40
[   22.284923]  kasan_save_free_info+0x3f/0x60
[   22.285770]  __kasan_slab_free+0x56/0x70
[   22.286406]  kfree+0x222/0x3f0
[   22.286821]  kmalloc_uaf2+0x14c/0x520
[   22.287249]  kunit_try_run_case+0x1b2/0x490
[   22.287882]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.288638]  kthread+0x323/0x710
[   22.289288]  ret_from_fork+0x41/0x80
[   22.289648]  ret_from_fork_asm+0x1a/0x30
[   22.289976] 
[   22.290148] The buggy address belongs to the object at ffff88810321e280
[   22.290148]  which belongs to the cache kmalloc-64 of size 64
[   22.291488] The buggy address is located 40 bytes inside of
[   22.291488]  freed 64-byte region [ffff88810321e280, ffff88810321e2c0)
[   22.292611] 
[   22.292829] The buggy address belongs to the physical page:
[   22.293151] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10321e
[   22.294069] flags: 0x200000000000000(node=0|zone=2)
[   22.295242] page_type: f5(slab)
[   22.295538] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000
[   22.296645] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
[   22.297643] page dumped because: kasan: bad access detected
[   22.298760] 
[   22.298952] Memory state around the buggy address:
[   22.299189]  ffff88810321e180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   22.299422]  ffff88810321e200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   22.299665] >ffff88810321e280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   22.300023]                                   ^
[   22.300331]  ffff88810321e300: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc
[   22.301818]  ffff88810321e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.302435] ==================================================================