Date
July 3, 2025, 3:13 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.844758] ================================================================== [ 15.844812] BUG: KASAN: slab-use-after-free in ksize_uaf+0x598/0x5f8 [ 15.845068] Read of size 1 at addr fff00000c7811700 by task kunit_try_catch/199 [ 15.845161] [ 15.845206] CPU: 1 UID: 0 PID: 199 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT [ 15.845635] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.845666] Hardware name: linux,dummy-virt (DT) [ 15.845963] Call trace: [ 15.846000] show_stack+0x20/0x38 (C) [ 15.846052] dump_stack_lvl+0x8c/0xd0 [ 15.846097] print_report+0x118/0x608 [ 15.846550] kasan_report+0xdc/0x128 [ 15.846630] __asan_report_load1_noabort+0x20/0x30 [ 15.847100] ksize_uaf+0x598/0x5f8 [ 15.847178] kunit_try_run_case+0x170/0x3f0 [ 15.847387] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.847612] kthread+0x328/0x630 [ 15.847695] ret_from_fork+0x10/0x20 [ 15.847848] [ 15.847917] Allocated by task 199: [ 15.848143] kasan_save_stack+0x3c/0x68 [ 15.848183] kasan_save_track+0x20/0x40 [ 15.848420] kasan_save_alloc_info+0x40/0x58 [ 15.848594] __kasan_kmalloc+0xd4/0xd8 [ 15.848695] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.848811] ksize_uaf+0xb8/0x5f8 [ 15.848997] kunit_try_run_case+0x170/0x3f0 [ 15.849099] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.849288] kthread+0x328/0x630 [ 15.849560] ret_from_fork+0x10/0x20 [ 15.849723] [ 15.849775] Freed by task 199: [ 15.849902] kasan_save_stack+0x3c/0x68 [ 15.850004] kasan_save_track+0x20/0x40 [ 15.850040] kasan_save_free_info+0x4c/0x78 [ 15.850314] __kasan_slab_free+0x6c/0x98 [ 15.850602] kfree+0x214/0x3c8 [ 15.850842] ksize_uaf+0x11c/0x5f8 [ 15.851019] kunit_try_run_case+0x170/0x3f0 [ 15.851143] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.851250] kthread+0x328/0x630 [ 15.851322] ret_from_fork+0x10/0x20 [ 15.851477] [ 15.851546] The buggy address belongs to the object at fff00000c7811700 [ 15.851546] which belongs to the cache kmalloc-128 of size 128 [ 15.851840] The buggy address is located 0 bytes inside of [ 15.851840] freed 128-byte region [fff00000c7811700, fff00000c7811780) [ 15.852065] [ 15.852114] The buggy address belongs to the physical page: [ 15.852174] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107811 [ 15.852318] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.852425] page_type: f5(slab) [ 15.852585] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 15.852647] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 15.852818] page dumped because: kasan: bad access detected [ 15.853031] [ 15.853084] Memory state around the buggy address: [ 15.853190] fff00000c7811600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.853237] fff00000c7811680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.853280] >fff00000c7811700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.853318] ^ [ 15.853357] fff00000c7811780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.853400] fff00000c7811800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.853438] ================================================================== [ 15.853939] ================================================================== [ 15.854003] BUG: KASAN: slab-use-after-free in ksize_uaf+0x544/0x5f8 [ 15.854050] Read of size 1 at addr fff00000c7811778 by task kunit_try_catch/199 [ 15.854294] [ 15.854688] CPU: 1 UID: 0 PID: 199 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT [ 15.854785] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.854876] Hardware name: linux,dummy-virt (DT) [ 15.854965] Call trace: [ 15.854998] show_stack+0x20/0x38 (C) [ 15.855217] dump_stack_lvl+0x8c/0xd0 [ 15.855326] print_report+0x118/0x608 [ 15.855457] kasan_report+0xdc/0x128 [ 15.855525] __asan_report_load1_noabort+0x20/0x30 [ 15.855677] ksize_uaf+0x544/0x5f8 [ 15.855745] kunit_try_run_case+0x170/0x3f0 [ 15.856029] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.856231] kthread+0x328/0x630 [ 15.856360] ret_from_fork+0x10/0x20 [ 15.856487] [ 15.856505] Allocated by task 199: [ 15.856740] kasan_save_stack+0x3c/0x68 [ 15.856920] kasan_save_track+0x20/0x40 [ 15.857517] kasan_save_alloc_info+0x40/0x58 [ 15.857714] __kasan_kmalloc+0xd4/0xd8 [ 15.857904] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.858079] ksize_uaf+0xb8/0x5f8 [ 15.858145] kunit_try_run_case+0x170/0x3f0 [ 15.858241] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.858309] kthread+0x328/0x630 [ 15.858346] ret_from_fork+0x10/0x20 [ 15.858382] [ 15.858402] Freed by task 199: [ 15.858434] kasan_save_stack+0x3c/0x68 [ 15.858655] kasan_save_track+0x20/0x40 [ 15.858830] kasan_save_free_info+0x4c/0x78 [ 15.858997] __kasan_slab_free+0x6c/0x98 [ 15.859127] kfree+0x214/0x3c8 [ 15.859187] ksize_uaf+0x11c/0x5f8 [ 15.859332] kunit_try_run_case+0x170/0x3f0 [ 15.859372] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.859582] kthread+0x328/0x630 [ 15.859843] ret_from_fork+0x10/0x20 [ 15.859905] [ 15.860034] The buggy address belongs to the object at fff00000c7811700 [ 15.860034] which belongs to the cache kmalloc-128 of size 128 [ 15.860152] The buggy address is located 120 bytes inside of [ 15.860152] freed 128-byte region [fff00000c7811700, fff00000c7811780) [ 15.860465] [ 15.860527] The buggy address belongs to the physical page: [ 15.860794] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107811 [ 15.860933] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.861039] page_type: f5(slab) [ 15.861166] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 15.861687] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 15.861775] page dumped because: kasan: bad access detected [ 15.861919] [ 15.862009] Memory state around the buggy address: [ 15.862069] fff00000c7811600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.862457] fff00000c7811680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.862621] >fff00000c7811700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.862787] ^ [ 15.862871] fff00000c7811780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.862926] fff00000c7811800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.863102] ================================================================== [ 15.835178] ================================================================== [ 15.835240] BUG: KASAN: slab-use-after-free in ksize_uaf+0x168/0x5f8 [ 15.836202] Read of size 1 at addr fff00000c7811700 by task kunit_try_catch/199 [ 15.836300] [ 15.836360] CPU: 1 UID: 0 PID: 199 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT [ 15.836448] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.836475] Hardware name: linux,dummy-virt (DT) [ 15.836504] Call trace: [ 15.836528] show_stack+0x20/0x38 (C) [ 15.836933] dump_stack_lvl+0x8c/0xd0 [ 15.837214] print_report+0x118/0x608 [ 15.837259] kasan_report+0xdc/0x128 [ 15.837305] __kasan_check_byte+0x54/0x70 [ 15.837349] ksize+0x30/0x88 [ 15.837785] ksize_uaf+0x168/0x5f8 [ 15.837882] kunit_try_run_case+0x170/0x3f0 [ 15.837933] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.838692] kthread+0x328/0x630 [ 15.838811] ret_from_fork+0x10/0x20 [ 15.838911] [ 15.838974] Allocated by task 199: [ 15.839097] kasan_save_stack+0x3c/0x68 [ 15.839256] kasan_save_track+0x20/0x40 [ 15.839640] kasan_save_alloc_info+0x40/0x58 [ 15.839824] __kasan_kmalloc+0xd4/0xd8 [ 15.839882] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.839930] ksize_uaf+0xb8/0x5f8 [ 15.840014] kunit_try_run_case+0x170/0x3f0 [ 15.840056] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.840103] kthread+0x328/0x630 [ 15.840137] ret_from_fork+0x10/0x20 [ 15.840182] [ 15.840223] Freed by task 199: [ 15.840259] kasan_save_stack+0x3c/0x68 [ 15.840296] kasan_save_track+0x20/0x40 [ 15.840336] kasan_save_free_info+0x4c/0x78 [ 15.840384] __kasan_slab_free+0x6c/0x98 [ 15.840418] kfree+0x214/0x3c8 [ 15.840459] ksize_uaf+0x11c/0x5f8 [ 15.840493] kunit_try_run_case+0x170/0x3f0 [ 15.840532] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.840573] kthread+0x328/0x630 [ 15.840618] ret_from_fork+0x10/0x20 [ 15.840652] [ 15.840670] The buggy address belongs to the object at fff00000c7811700 [ 15.840670] which belongs to the cache kmalloc-128 of size 128 [ 15.840727] The buggy address is located 0 bytes inside of [ 15.840727] freed 128-byte region [fff00000c7811700, fff00000c7811780) [ 15.840785] [ 15.840805] The buggy address belongs to the physical page: [ 15.840849] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107811 [ 15.840908] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.841626] page_type: f5(slab) [ 15.841705] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 15.841778] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 15.842125] page dumped because: kasan: bad access detected [ 15.842190] [ 15.842406] Memory state around the buggy address: [ 15.842574] fff00000c7811600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.842663] fff00000c7811680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.842707] >fff00000c7811700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.842746] ^ [ 15.842937] fff00000c7811780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.843258] fff00000c7811800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.843472] ==================================================================
[ 11.664479] ================================================================== [ 11.664824] BUG: KASAN: slab-use-after-free in ksize_uaf+0x5fe/0x6c0 [ 11.665216] Read of size 1 at addr ffff888102dc0a00 by task kunit_try_catch/215 [ 11.665498] [ 11.665591] CPU: 1 UID: 0 PID: 215 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT(voluntary) [ 11.665633] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.665645] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.665665] Call Trace: [ 11.665676] <TASK> [ 11.665688] dump_stack_lvl+0x73/0xb0 [ 11.665712] print_report+0xd1/0x650 [ 11.665733] ? __virt_addr_valid+0x1db/0x2d0 [ 11.665754] ? ksize_uaf+0x5fe/0x6c0 [ 11.665774] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.665797] ? ksize_uaf+0x5fe/0x6c0 [ 11.665818] kasan_report+0x141/0x180 [ 11.665841] ? ksize_uaf+0x5fe/0x6c0 [ 11.665867] __asan_report_load1_noabort+0x18/0x20 [ 11.665888] ksize_uaf+0x5fe/0x6c0 [ 11.665908] ? __pfx_ksize_uaf+0x10/0x10 [ 11.665931] ? __schedule+0x10cc/0x2b60 [ 11.665953] ? __pfx_read_tsc+0x10/0x10 [ 11.665972] ? ktime_get_ts64+0x86/0x230 [ 11.665996] kunit_try_run_case+0x1a5/0x480 [ 11.666019] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.666040] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.666063] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.666086] ? __kthread_parkme+0x82/0x180 [ 11.666107] ? preempt_count_sub+0x50/0x80 [ 11.666131] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.666154] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.666176] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.666261] kthread+0x337/0x6f0 [ 11.666314] ? trace_preempt_on+0x20/0xc0 [ 11.666338] ? __pfx_kthread+0x10/0x10 [ 11.666356] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.666378] ? calculate_sigpending+0x7b/0xa0 [ 11.666399] ? __pfx_kthread+0x10/0x10 [ 11.666417] ret_from_fork+0x41/0x80 [ 11.666437] ? __pfx_kthread+0x10/0x10 [ 11.666455] ret_from_fork_asm+0x1a/0x30 [ 11.666484] </TASK> [ 11.666494] [ 11.673995] Allocated by task 215: [ 11.674220] kasan_save_stack+0x45/0x70 [ 11.674561] kasan_save_track+0x18/0x40 [ 11.674756] kasan_save_alloc_info+0x3b/0x50 [ 11.674963] __kasan_kmalloc+0xb7/0xc0 [ 11.675148] __kmalloc_cache_noprof+0x189/0x420 [ 11.676327] ksize_uaf+0xaa/0x6c0 [ 11.676545] kunit_try_run_case+0x1a5/0x480 [ 11.677015] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.677207] kthread+0x337/0x6f0 [ 11.677800] ret_from_fork+0x41/0x80 [ 11.678076] ret_from_fork_asm+0x1a/0x30 [ 11.678741] [ 11.678846] Freed by task 215: [ 11.679003] kasan_save_stack+0x45/0x70 [ 11.679188] kasan_save_track+0x18/0x40 [ 11.679677] kasan_save_free_info+0x3f/0x60 [ 11.680059] __kasan_slab_free+0x56/0x70 [ 11.680473] kfree+0x222/0x3f0 [ 11.680636] ksize_uaf+0x12c/0x6c0 [ 11.681089] kunit_try_run_case+0x1a5/0x480 [ 11.681345] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.681613] kthread+0x337/0x6f0 [ 11.682164] ret_from_fork+0x41/0x80 [ 11.682522] ret_from_fork_asm+0x1a/0x30 [ 11.682897] [ 11.682993] The buggy address belongs to the object at ffff888102dc0a00 [ 11.682993] which belongs to the cache kmalloc-128 of size 128 [ 11.684075] The buggy address is located 0 bytes inside of [ 11.684075] freed 128-byte region [ffff888102dc0a00, ffff888102dc0a80) [ 11.685006] [ 11.685344] The buggy address belongs to the physical page: [ 11.685596] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102dc0 [ 11.686642] flags: 0x200000000000000(node=0|zone=2) [ 11.687074] page_type: f5(slab) [ 11.687606] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 11.688092] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 11.688603] page dumped because: kasan: bad access detected [ 11.689026] [ 11.689270] Memory state around the buggy address: [ 11.689563] ffff888102dc0900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.690084] ffff888102dc0980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.690705] >ffff888102dc0a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.691020] ^ [ 11.691176] ffff888102dc0a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.691834] ffff888102dc0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.692301] ================================================================== [ 11.642980] ================================================================== [ 11.643849] BUG: KASAN: slab-use-after-free in ksize_uaf+0x19d/0x6c0 [ 11.644168] Read of size 1 at addr ffff888102dc0a00 by task kunit_try_catch/215 [ 11.644480] [ 11.644595] CPU: 1 UID: 0 PID: 215 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT(voluntary) [ 11.644884] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.644900] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.644922] Call Trace: [ 11.644935] <TASK> [ 11.644951] dump_stack_lvl+0x73/0xb0 [ 11.644981] print_report+0xd1/0x650 [ 11.645003] ? __virt_addr_valid+0x1db/0x2d0 [ 11.645026] ? ksize_uaf+0x19d/0x6c0 [ 11.645047] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.645069] ? ksize_uaf+0x19d/0x6c0 [ 11.645091] kasan_report+0x141/0x180 [ 11.645113] ? ksize_uaf+0x19d/0x6c0 [ 11.645137] ? ksize_uaf+0x19d/0x6c0 [ 11.645158] __kasan_check_byte+0x3d/0x50 [ 11.645180] ksize+0x20/0x60 [ 11.645202] ksize_uaf+0x19d/0x6c0 [ 11.645223] ? __pfx_ksize_uaf+0x10/0x10 [ 11.645259] ? __schedule+0x10cc/0x2b60 [ 11.645346] ? __pfx_read_tsc+0x10/0x10 [ 11.645371] ? ktime_get_ts64+0x86/0x230 [ 11.645396] kunit_try_run_case+0x1a5/0x480 [ 11.645422] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.645443] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.645467] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.645490] ? __kthread_parkme+0x82/0x180 [ 11.645512] ? preempt_count_sub+0x50/0x80 [ 11.645537] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.645569] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.645591] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.645614] kthread+0x337/0x6f0 [ 11.645631] ? trace_preempt_on+0x20/0xc0 [ 11.645665] ? __pfx_kthread+0x10/0x10 [ 11.645682] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.645704] ? calculate_sigpending+0x7b/0xa0 [ 11.645726] ? __pfx_kthread+0x10/0x10 [ 11.645744] ret_from_fork+0x41/0x80 [ 11.645764] ? __pfx_kthread+0x10/0x10 [ 11.645781] ret_from_fork_asm+0x1a/0x30 [ 11.645812] </TASK> [ 11.645823] [ 11.652863] Allocated by task 215: [ 11.653039] kasan_save_stack+0x45/0x70 [ 11.653288] kasan_save_track+0x18/0x40 [ 11.653487] kasan_save_alloc_info+0x3b/0x50 [ 11.653770] __kasan_kmalloc+0xb7/0xc0 [ 11.653914] __kmalloc_cache_noprof+0x189/0x420 [ 11.654067] ksize_uaf+0xaa/0x6c0 [ 11.654189] kunit_try_run_case+0x1a5/0x480 [ 11.654506] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.654762] kthread+0x337/0x6f0 [ 11.655066] ret_from_fork+0x41/0x80 [ 11.655368] ret_from_fork_asm+0x1a/0x30 [ 11.655575] [ 11.655669] Freed by task 215: [ 11.655795] kasan_save_stack+0x45/0x70 [ 11.655930] kasan_save_track+0x18/0x40 [ 11.656099] kasan_save_free_info+0x3f/0x60 [ 11.656368] __kasan_slab_free+0x56/0x70 [ 11.656563] kfree+0x222/0x3f0 [ 11.656922] ksize_uaf+0x12c/0x6c0 [ 11.657070] kunit_try_run_case+0x1a5/0x480 [ 11.657269] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.657560] kthread+0x337/0x6f0 [ 11.657731] ret_from_fork+0x41/0x80 [ 11.657895] ret_from_fork_asm+0x1a/0x30 [ 11.658066] [ 11.658152] The buggy address belongs to the object at ffff888102dc0a00 [ 11.658152] which belongs to the cache kmalloc-128 of size 128 [ 11.658650] The buggy address is located 0 bytes inside of [ 11.658650] freed 128-byte region [ffff888102dc0a00, ffff888102dc0a80) [ 11.658996] [ 11.659067] The buggy address belongs to the physical page: [ 11.659282] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102dc0 [ 11.660017] flags: 0x200000000000000(node=0|zone=2) [ 11.660225] page_type: f5(slab) [ 11.660355] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 11.660584] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 11.661201] page dumped because: kasan: bad access detected [ 11.661462] [ 11.661560] Memory state around the buggy address: [ 11.661873] ffff888102dc0900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.662092] ffff888102dc0980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.662520] >ffff888102dc0a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.662984] ^ [ 11.663110] ffff888102dc0a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.663393] ffff888102dc0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.663900] ================================================================== [ 11.693045] ================================================================== [ 11.693767] BUG: KASAN: slab-use-after-free in ksize_uaf+0x5e4/0x6c0 [ 11.694050] Read of size 1 at addr ffff888102dc0a78 by task kunit_try_catch/215 [ 11.694472] [ 11.694581] CPU: 1 UID: 0 PID: 215 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT(voluntary) [ 11.694625] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.694637] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.694878] Call Trace: [ 11.694897] <TASK> [ 11.694912] dump_stack_lvl+0x73/0xb0 [ 11.694937] print_report+0xd1/0x650 [ 11.694960] ? __virt_addr_valid+0x1db/0x2d0 [ 11.694982] ? ksize_uaf+0x5e4/0x6c0 [ 11.695004] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.695190] ? ksize_uaf+0x5e4/0x6c0 [ 11.695215] kasan_report+0x141/0x180 [ 11.695252] ? ksize_uaf+0x5e4/0x6c0 [ 11.695279] __asan_report_load1_noabort+0x18/0x20 [ 11.695300] ksize_uaf+0x5e4/0x6c0 [ 11.695322] ? __pfx_ksize_uaf+0x10/0x10 [ 11.695345] ? __schedule+0x10cc/0x2b60 [ 11.695368] ? __pfx_read_tsc+0x10/0x10 [ 11.695388] ? ktime_get_ts64+0x86/0x230 [ 11.695413] kunit_try_run_case+0x1a5/0x480 [ 11.695461] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.695483] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.695507] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.695530] ? __kthread_parkme+0x82/0x180 [ 11.695551] ? preempt_count_sub+0x50/0x80 [ 11.695576] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.695599] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.695622] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.695644] kthread+0x337/0x6f0 [ 11.695661] ? trace_preempt_on+0x20/0xc0 [ 11.695683] ? __pfx_kthread+0x10/0x10 [ 11.695701] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.695723] ? calculate_sigpending+0x7b/0xa0 [ 11.695744] ? __pfx_kthread+0x10/0x10 [ 11.695762] ret_from_fork+0x41/0x80 [ 11.695782] ? __pfx_kthread+0x10/0x10 [ 11.695800] ret_from_fork_asm+0x1a/0x30 [ 11.695830] </TASK> [ 11.695840] [ 11.704931] Allocated by task 215: [ 11.705092] kasan_save_stack+0x45/0x70 [ 11.705329] kasan_save_track+0x18/0x40 [ 11.705523] kasan_save_alloc_info+0x3b/0x50 [ 11.705805] __kasan_kmalloc+0xb7/0xc0 [ 11.705944] __kmalloc_cache_noprof+0x189/0x420 [ 11.706117] ksize_uaf+0xaa/0x6c0 [ 11.706364] kunit_try_run_case+0x1a5/0x480 [ 11.706579] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.706954] kthread+0x337/0x6f0 [ 11.707114] ret_from_fork+0x41/0x80 [ 11.707351] ret_from_fork_asm+0x1a/0x30 [ 11.707512] [ 11.707607] Freed by task 215: [ 11.707799] kasan_save_stack+0x45/0x70 [ 11.707972] kasan_save_track+0x18/0x40 [ 11.708145] kasan_save_free_info+0x3f/0x60 [ 11.708338] __kasan_slab_free+0x56/0x70 [ 11.708641] kfree+0x222/0x3f0 [ 11.708763] ksize_uaf+0x12c/0x6c0 [ 11.708941] kunit_try_run_case+0x1a5/0x480 [ 11.709136] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.709378] kthread+0x337/0x6f0 [ 11.709776] ret_from_fork+0x41/0x80 [ 11.710066] ret_from_fork_asm+0x1a/0x30 [ 11.710215] [ 11.710331] The buggy address belongs to the object at ffff888102dc0a00 [ 11.710331] which belongs to the cache kmalloc-128 of size 128 [ 11.710917] The buggy address is located 120 bytes inside of [ 11.710917] freed 128-byte region [ffff888102dc0a00, ffff888102dc0a80) [ 11.711352] [ 11.711495] The buggy address belongs to the physical page: [ 11.711848] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102dc0 [ 11.712100] flags: 0x200000000000000(node=0|zone=2) [ 11.712425] page_type: f5(slab) [ 11.712597] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 11.713007] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 11.713344] page dumped because: kasan: bad access detected [ 11.713625] [ 11.713775] Memory state around the buggy address: [ 11.713971] ffff888102dc0900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.714228] ffff888102dc0980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.714757] >ffff888102dc0a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.714979] ^ [ 11.715191] ffff888102dc0a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.715473] ffff888102dc0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.715792] ==================================================================