Date
July 10, 2025, 6:10 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 17.165588] ================================================================== [ 17.165659] BUG: KASAN: slab-use-after-free in ksize_uaf+0x598/0x5f8 [ 17.165711] Read of size 1 at addr fff00000c5a20400 by task kunit_try_catch/196 [ 17.165761] [ 17.165798] CPU: 1 UID: 0 PID: 196 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT [ 17.165879] Tainted: [B]=BAD_PAGE, [N]=TEST [ 17.166231] Hardware name: linux,dummy-virt (DT) [ 17.166451] Call trace: [ 17.166484] show_stack+0x20/0x38 (C) [ 17.166856] dump_stack_lvl+0x8c/0xd0 [ 17.167181] print_report+0x118/0x608 [ 17.167447] kasan_report+0xdc/0x128 [ 17.167522] __asan_report_load1_noabort+0x20/0x30 [ 17.167732] ksize_uaf+0x598/0x5f8 [ 17.167990] kunit_try_run_case+0x170/0x3f0 [ 17.168075] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.168236] kthread+0x328/0x630 [ 17.168406] ret_from_fork+0x10/0x20 [ 17.168511] [ 17.168529] Allocated by task 196: [ 17.168714] kasan_save_stack+0x3c/0x68 [ 17.168935] kasan_save_track+0x20/0x40 [ 17.169099] kasan_save_alloc_info+0x40/0x58 [ 17.169368] __kasan_kmalloc+0xd4/0xd8 [ 17.169456] __kmalloc_cache_noprof+0x16c/0x3c0 [ 17.169497] ksize_uaf+0xb8/0x5f8 [ 17.169566] kunit_try_run_case+0x170/0x3f0 [ 17.169864] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.170096] kthread+0x328/0x630 [ 17.170214] ret_from_fork+0x10/0x20 [ 17.170414] [ 17.170440] Freed by task 196: [ 17.170469] kasan_save_stack+0x3c/0x68 [ 17.170541] kasan_save_track+0x20/0x40 [ 17.170736] kasan_save_free_info+0x4c/0x78 [ 17.170922] __kasan_slab_free+0x6c/0x98 [ 17.171027] kfree+0x214/0x3c8 [ 17.171091] ksize_uaf+0x11c/0x5f8 [ 17.171224] kunit_try_run_case+0x170/0x3f0 [ 17.171264] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.171502] kthread+0x328/0x630 [ 17.171670] ret_from_fork+0x10/0x20 [ 17.171876] [ 17.172234] The buggy address belongs to the object at fff00000c5a20400 [ 17.172234] which belongs to the cache kmalloc-128 of size 128 [ 17.172610] The buggy address is located 0 bytes inside of [ 17.172610] freed 128-byte region [fff00000c5a20400, fff00000c5a20480) [ 17.172791] [ 17.172932] The buggy address belongs to the physical page: [ 17.172975] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105a20 [ 17.173205] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 17.173368] page_type: f5(slab) [ 17.173520] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 17.173629] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 17.173748] page dumped because: kasan: bad access detected [ 17.173852] [ 17.173870] Memory state around the buggy address: [ 17.174131] fff00000c5a20300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.174237] fff00000c5a20380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.174463] >fff00000c5a20400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.174570] ^ [ 17.174704] fff00000c5a20480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.174845] fff00000c5a20500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.174887] ================================================================== [ 17.176234] ================================================================== [ 17.176289] BUG: KASAN: slab-use-after-free in ksize_uaf+0x544/0x5f8 [ 17.176357] Read of size 1 at addr fff00000c5a20478 by task kunit_try_catch/196 [ 17.176409] [ 17.176440] CPU: 1 UID: 0 PID: 196 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT [ 17.176524] Tainted: [B]=BAD_PAGE, [N]=TEST [ 17.176550] Hardware name: linux,dummy-virt (DT) [ 17.176580] Call trace: [ 17.176601] show_stack+0x20/0x38 (C) [ 17.176648] dump_stack_lvl+0x8c/0xd0 [ 17.176697] print_report+0x118/0x608 [ 17.176743] kasan_report+0xdc/0x128 [ 17.176790] __asan_report_load1_noabort+0x20/0x30 [ 17.176843] ksize_uaf+0x544/0x5f8 [ 17.176887] kunit_try_run_case+0x170/0x3f0 [ 17.176940] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.176994] kthread+0x328/0x630 [ 17.177038] ret_from_fork+0x10/0x20 [ 17.177085] [ 17.177102] Allocated by task 196: [ 17.177130] kasan_save_stack+0x3c/0x68 [ 17.177172] kasan_save_track+0x20/0x40 [ 17.177211] kasan_save_alloc_info+0x40/0x58 [ 17.177252] __kasan_kmalloc+0xd4/0xd8 [ 17.177289] __kmalloc_cache_noprof+0x16c/0x3c0 [ 17.177331] ksize_uaf+0xb8/0x5f8 [ 17.177403] kunit_try_run_case+0x170/0x3f0 [ 17.177451] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.177534] kthread+0x328/0x630 [ 17.177569] ret_from_fork+0x10/0x20 [ 17.177604] [ 17.177624] Freed by task 196: [ 17.177650] kasan_save_stack+0x3c/0x68 [ 17.177718] kasan_save_track+0x20/0x40 [ 17.177784] kasan_save_free_info+0x4c/0x78 [ 17.177902] __kasan_slab_free+0x6c/0x98 [ 17.177987] kfree+0x214/0x3c8 [ 17.178021] ksize_uaf+0x11c/0x5f8 [ 17.178070] kunit_try_run_case+0x170/0x3f0 [ 17.178108] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.178422] kthread+0x328/0x630 [ 17.178611] ret_from_fork+0x10/0x20 [ 17.178729] [ 17.178875] The buggy address belongs to the object at fff00000c5a20400 [ 17.178875] which belongs to the cache kmalloc-128 of size 128 [ 17.179000] The buggy address is located 120 bytes inside of [ 17.179000] freed 128-byte region [fff00000c5a20400, fff00000c5a20480) [ 17.179151] [ 17.179218] The buggy address belongs to the physical page: [ 17.179305] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105a20 [ 17.179408] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 17.179454] page_type: f5(slab) [ 17.179547] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 17.179854] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 17.180002] page dumped because: kasan: bad access detected [ 17.180120] [ 17.180199] Memory state around the buggy address: [ 17.180371] fff00000c5a20300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.180489] fff00000c5a20380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.180665] >fff00000c5a20400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.180742] ^ [ 17.180906] fff00000c5a20480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.180986] fff00000c5a20500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.181032] ================================================================== [ 17.152564] ================================================================== [ 17.152627] BUG: KASAN: slab-use-after-free in ksize_uaf+0x168/0x5f8 [ 17.152683] Read of size 1 at addr fff00000c5a20400 by task kunit_try_catch/196 [ 17.153465] [ 17.153518] CPU: 1 UID: 0 PID: 196 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT [ 17.154113] Tainted: [B]=BAD_PAGE, [N]=TEST [ 17.154210] Hardware name: linux,dummy-virt (DT) [ 17.154406] Call trace: [ 17.154680] show_stack+0x20/0x38 (C) [ 17.154754] dump_stack_lvl+0x8c/0xd0 [ 17.154976] print_report+0x118/0x608 [ 17.155313] kasan_report+0xdc/0x128 [ 17.155409] __kasan_check_byte+0x54/0x70 [ 17.155535] ksize+0x30/0x88 [ 17.156031] ksize_uaf+0x168/0x5f8 [ 17.156459] kunit_try_run_case+0x170/0x3f0 [ 17.156697] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.157016] kthread+0x328/0x630 [ 17.157269] ret_from_fork+0x10/0x20 [ 17.157328] [ 17.157357] Allocated by task 196: [ 17.157734] kasan_save_stack+0x3c/0x68 [ 17.157808] kasan_save_track+0x20/0x40 [ 17.157937] kasan_save_alloc_info+0x40/0x58 [ 17.158005] __kasan_kmalloc+0xd4/0xd8 [ 17.158309] __kmalloc_cache_noprof+0x16c/0x3c0 [ 17.158399] ksize_uaf+0xb8/0x5f8 [ 17.158437] kunit_try_run_case+0x170/0x3f0 [ 17.158836] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.159052] kthread+0x328/0x630 [ 17.159119] ret_from_fork+0x10/0x20 [ 17.159503] [ 17.159617] Freed by task 196: [ 17.159742] kasan_save_stack+0x3c/0x68 [ 17.159956] kasan_save_track+0x20/0x40 [ 17.160182] kasan_save_free_info+0x4c/0x78 [ 17.160311] __kasan_slab_free+0x6c/0x98 [ 17.160650] kfree+0x214/0x3c8 [ 17.160855] ksize_uaf+0x11c/0x5f8 [ 17.160896] kunit_try_run_case+0x170/0x3f0 [ 17.161203] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.161260] kthread+0x328/0x630 [ 17.161386] ret_from_fork+0x10/0x20 [ 17.161428] [ 17.161458] The buggy address belongs to the object at fff00000c5a20400 [ 17.161458] which belongs to the cache kmalloc-128 of size 128 [ 17.161536] The buggy address is located 0 bytes inside of [ 17.161536] freed 128-byte region [fff00000c5a20400, fff00000c5a20480) [ 17.161608] [ 17.161631] The buggy address belongs to the physical page: [ 17.161661] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105a20 [ 17.161728] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 17.161780] page_type: f5(slab) [ 17.161830] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 17.161881] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 17.162397] page dumped because: kasan: bad access detected [ 17.162455] [ 17.162515] Memory state around the buggy address: [ 17.162656] fff00000c5a20300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.162843] fff00000c5a20380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.163141] >fff00000c5a20400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.163397] ^ [ 17.163537] fff00000c5a20480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.163689] fff00000c5a20500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.163942] ==================================================================
[ 12.975817] ================================================================== [ 12.976563] BUG: KASAN: slab-use-after-free in ksize_uaf+0x5fe/0x6c0 [ 12.976848] Read of size 1 at addr ffff888102791800 by task kunit_try_catch/213 [ 12.977301] [ 12.977707] CPU: 1 UID: 0 PID: 213 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT(voluntary) [ 12.977751] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.977761] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.977780] Call Trace: [ 12.977942] <TASK> [ 12.977956] dump_stack_lvl+0x73/0xb0 [ 12.977986] print_report+0xd1/0x650 [ 12.978007] ? __virt_addr_valid+0x1db/0x2d0 [ 12.978042] ? ksize_uaf+0x5fe/0x6c0 [ 12.978061] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.978084] ? ksize_uaf+0x5fe/0x6c0 [ 12.978104] kasan_report+0x141/0x180 [ 12.978125] ? ksize_uaf+0x5fe/0x6c0 [ 12.978149] __asan_report_load1_noabort+0x18/0x20 [ 12.978173] ksize_uaf+0x5fe/0x6c0 [ 12.978193] ? __pfx_ksize_uaf+0x10/0x10 [ 12.978214] ? __schedule+0x10cc/0x2b60 [ 12.978234] ? __pfx_read_tsc+0x10/0x10 [ 12.978254] ? ktime_get_ts64+0x86/0x230 [ 12.978277] kunit_try_run_case+0x1a5/0x480 [ 12.978300] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.978322] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.978345] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.978368] ? __kthread_parkme+0x82/0x180 [ 12.978388] ? preempt_count_sub+0x50/0x80 [ 12.978411] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.978434] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.978458] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.978483] kthread+0x337/0x6f0 [ 12.978501] ? trace_preempt_on+0x20/0xc0 [ 12.978522] ? __pfx_kthread+0x10/0x10 [ 12.978542] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.978563] ? calculate_sigpending+0x7b/0xa0 [ 12.978586] ? __pfx_kthread+0x10/0x10 [ 12.978607] ret_from_fork+0x116/0x1d0 [ 12.978624] ? __pfx_kthread+0x10/0x10 [ 12.978644] ret_from_fork_asm+0x1a/0x30 [ 12.978673] </TASK> [ 12.978683] [ 12.988719] Allocated by task 213: [ 12.989295] kasan_save_stack+0x45/0x70 [ 12.989501] kasan_save_track+0x18/0x40 [ 12.989790] kasan_save_alloc_info+0x3b/0x50 [ 12.990115] __kasan_kmalloc+0xb7/0xc0 [ 12.990329] __kmalloc_cache_noprof+0x189/0x420 [ 12.990494] ksize_uaf+0xaa/0x6c0 [ 12.990668] kunit_try_run_case+0x1a5/0x480 [ 12.990852] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.991412] kthread+0x337/0x6f0 [ 12.991571] ret_from_fork+0x116/0x1d0 [ 12.991755] ret_from_fork_asm+0x1a/0x30 [ 12.992253] [ 12.992344] Freed by task 213: [ 12.992657] kasan_save_stack+0x45/0x70 [ 12.992972] kasan_save_track+0x18/0x40 [ 12.993193] kasan_save_free_info+0x3f/0x60 [ 12.993661] __kasan_slab_free+0x56/0x70 [ 12.993858] kfree+0x222/0x3f0 [ 12.994094] ksize_uaf+0x12c/0x6c0 [ 12.994245] kunit_try_run_case+0x1a5/0x480 [ 12.994447] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.994684] kthread+0x337/0x6f0 [ 12.994841] ret_from_fork+0x116/0x1d0 [ 12.995015] ret_from_fork_asm+0x1a/0x30 [ 12.995208] [ 12.995295] The buggy address belongs to the object at ffff888102791800 [ 12.995295] which belongs to the cache kmalloc-128 of size 128 [ 12.995785] The buggy address is located 0 bytes inside of [ 12.995785] freed 128-byte region [ffff888102791800, ffff888102791880) [ 12.997252] [ 12.997541] The buggy address belongs to the physical page: [ 12.997794] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102791 [ 12.998312] flags: 0x200000000000000(node=0|zone=2) [ 12.998610] page_type: f5(slab) [ 12.998785] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 12.999387] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 12.999800] page dumped because: kasan: bad access detected [ 13.000261] [ 13.000362] Memory state around the buggy address: [ 13.000551] ffff888102791700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 13.001092] ffff888102791780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.001485] >ffff888102791800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 13.002116] ^ [ 13.002283] ffff888102791880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.002674] ffff888102791900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.003190] ================================================================== [ 12.952748] ================================================================== [ 12.953558] BUG: KASAN: slab-use-after-free in ksize_uaf+0x19d/0x6c0 [ 12.954098] Read of size 1 at addr ffff888102791800 by task kunit_try_catch/213 [ 12.954394] [ 12.954486] CPU: 1 UID: 0 PID: 213 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT(voluntary) [ 12.954531] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.954543] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.954563] Call Trace: [ 12.954575] <TASK> [ 12.954593] dump_stack_lvl+0x73/0xb0 [ 12.954624] print_report+0xd1/0x650 [ 12.954645] ? __virt_addr_valid+0x1db/0x2d0 [ 12.954669] ? ksize_uaf+0x19d/0x6c0 [ 12.954688] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.954711] ? ksize_uaf+0x19d/0x6c0 [ 12.954731] kasan_report+0x141/0x180 [ 12.954752] ? ksize_uaf+0x19d/0x6c0 [ 12.954775] ? ksize_uaf+0x19d/0x6c0 [ 12.954795] __kasan_check_byte+0x3d/0x50 [ 12.955112] ksize+0x20/0x60 [ 12.955137] ksize_uaf+0x19d/0x6c0 [ 12.955157] ? __pfx_ksize_uaf+0x10/0x10 [ 12.955179] ? __schedule+0x10cc/0x2b60 [ 12.955200] ? __pfx_read_tsc+0x10/0x10 [ 12.955221] ? ktime_get_ts64+0x86/0x230 [ 12.955246] kunit_try_run_case+0x1a5/0x480 [ 12.955271] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.955293] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.955317] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.955340] ? __kthread_parkme+0x82/0x180 [ 12.955361] ? preempt_count_sub+0x50/0x80 [ 12.955384] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.955408] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.955432] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.955456] kthread+0x337/0x6f0 [ 12.955474] ? trace_preempt_on+0x20/0xc0 [ 12.955496] ? __pfx_kthread+0x10/0x10 [ 12.955516] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.955538] ? calculate_sigpending+0x7b/0xa0 [ 12.955561] ? __pfx_kthread+0x10/0x10 [ 12.955582] ret_from_fork+0x116/0x1d0 [ 12.955600] ? __pfx_kthread+0x10/0x10 [ 12.955620] ret_from_fork_asm+0x1a/0x30 [ 12.955650] </TASK> [ 12.955661] [ 12.962878] Allocated by task 213: [ 12.963010] kasan_save_stack+0x45/0x70 [ 12.963167] kasan_save_track+0x18/0x40 [ 12.963300] kasan_save_alloc_info+0x3b/0x50 [ 12.963546] __kasan_kmalloc+0xb7/0xc0 [ 12.963729] __kmalloc_cache_noprof+0x189/0x420 [ 12.964167] ksize_uaf+0xaa/0x6c0 [ 12.964344] kunit_try_run_case+0x1a5/0x480 [ 12.964490] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.964667] kthread+0x337/0x6f0 [ 12.964885] ret_from_fork+0x116/0x1d0 [ 12.965279] ret_from_fork_asm+0x1a/0x30 [ 12.965482] [ 12.965577] Freed by task 213: [ 12.965732] kasan_save_stack+0x45/0x70 [ 12.966075] kasan_save_track+0x18/0x40 [ 12.966251] kasan_save_free_info+0x3f/0x60 [ 12.966448] __kasan_slab_free+0x56/0x70 [ 12.966617] kfree+0x222/0x3f0 [ 12.966765] ksize_uaf+0x12c/0x6c0 [ 12.967068] kunit_try_run_case+0x1a5/0x480 [ 12.967238] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.967457] kthread+0x337/0x6f0 [ 12.967616] ret_from_fork+0x116/0x1d0 [ 12.967807] ret_from_fork_asm+0x1a/0x30 [ 12.968141] [ 12.968238] The buggy address belongs to the object at ffff888102791800 [ 12.968238] which belongs to the cache kmalloc-128 of size 128 [ 12.968600] The buggy address is located 0 bytes inside of [ 12.968600] freed 128-byte region [ffff888102791800, ffff888102791880) [ 12.968942] [ 12.969024] The buggy address belongs to the physical page: [ 12.969280] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102791 [ 12.969789] flags: 0x200000000000000(node=0|zone=2) [ 12.970165] page_type: f5(slab) [ 12.970333] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 12.970571] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 12.970795] page dumped because: kasan: bad access detected [ 12.971325] [ 12.971422] Memory state around the buggy address: [ 12.971690] ffff888102791700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.972134] ffff888102791780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.972417] >ffff888102791800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.972639] ^ [ 12.972757] ffff888102791880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.974065] ffff888102791900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.975134] ================================================================== [ 13.004892] ================================================================== [ 13.005210] BUG: KASAN: slab-use-after-free in ksize_uaf+0x5e4/0x6c0 [ 13.005515] Read of size 1 at addr ffff888102791878 by task kunit_try_catch/213 [ 13.005786] [ 13.006147] CPU: 1 UID: 0 PID: 213 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT(voluntary) [ 13.006191] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.006202] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.006221] Call Trace: [ 13.006235] <TASK> [ 13.006248] dump_stack_lvl+0x73/0xb0 [ 13.006278] print_report+0xd1/0x650 [ 13.006299] ? __virt_addr_valid+0x1db/0x2d0 [ 13.006321] ? ksize_uaf+0x5e4/0x6c0 [ 13.006341] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.006364] ? ksize_uaf+0x5e4/0x6c0 [ 13.006384] kasan_report+0x141/0x180 [ 13.006405] ? ksize_uaf+0x5e4/0x6c0 [ 13.006429] __asan_report_load1_noabort+0x18/0x20 [ 13.006454] ksize_uaf+0x5e4/0x6c0 [ 13.006473] ? __pfx_ksize_uaf+0x10/0x10 [ 13.006494] ? __schedule+0x10cc/0x2b60 [ 13.006516] ? __pfx_read_tsc+0x10/0x10 [ 13.006536] ? ktime_get_ts64+0x86/0x230 [ 13.006559] kunit_try_run_case+0x1a5/0x480 [ 13.006582] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.006605] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.006628] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.006651] ? __kthread_parkme+0x82/0x180 [ 13.006671] ? preempt_count_sub+0x50/0x80 [ 13.006694] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.006717] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.006741] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.006766] kthread+0x337/0x6f0 [ 13.006784] ? trace_preempt_on+0x20/0xc0 [ 13.007027] ? __pfx_kthread+0x10/0x10 [ 13.007069] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.007091] ? calculate_sigpending+0x7b/0xa0 [ 13.007114] ? __pfx_kthread+0x10/0x10 [ 13.007134] ret_from_fork+0x116/0x1d0 [ 13.007153] ? __pfx_kthread+0x10/0x10 [ 13.007173] ret_from_fork_asm+0x1a/0x30 [ 13.007202] </TASK> [ 13.007213] [ 13.014208] Allocated by task 213: [ 13.014375] kasan_save_stack+0x45/0x70 [ 13.014555] kasan_save_track+0x18/0x40 [ 13.014732] kasan_save_alloc_info+0x3b/0x50 [ 13.014917] __kasan_kmalloc+0xb7/0xc0 [ 13.015260] __kmalloc_cache_noprof+0x189/0x420 [ 13.015434] ksize_uaf+0xaa/0x6c0 [ 13.015604] kunit_try_run_case+0x1a5/0x480 [ 13.015814] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.016543] kthread+0x337/0x6f0 [ 13.016679] ret_from_fork+0x116/0x1d0 [ 13.018168] ret_from_fork_asm+0x1a/0x30 [ 13.018369] [ 13.018449] Freed by task 213: [ 13.018587] kasan_save_stack+0x45/0x70 [ 13.018781] kasan_save_track+0x18/0x40 [ 13.018961] kasan_save_free_info+0x3f/0x60 [ 13.019170] __kasan_slab_free+0x56/0x70 [ 13.021300] kfree+0x222/0x3f0 [ 13.021435] ksize_uaf+0x12c/0x6c0 [ 13.021562] kunit_try_run_case+0x1a5/0x480 [ 13.021708] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.021884] kthread+0x337/0x6f0 [ 13.022013] ret_from_fork+0x116/0x1d0 [ 13.022156] ret_from_fork_asm+0x1a/0x30 [ 13.022296] [ 13.022367] The buggy address belongs to the object at ffff888102791800 [ 13.022367] which belongs to the cache kmalloc-128 of size 128 [ 13.022723] The buggy address is located 120 bytes inside of [ 13.022723] freed 128-byte region [ffff888102791800, ffff888102791880) [ 13.024568] [ 13.025341] The buggy address belongs to the physical page: [ 13.026198] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102791 [ 13.026663] flags: 0x200000000000000(node=0|zone=2) [ 13.027102] page_type: f5(slab) [ 13.027387] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 13.027833] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 13.028434] page dumped because: kasan: bad access detected [ 13.028656] [ 13.028744] Memory state around the buggy address: [ 13.029059] ffff888102791700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 13.029374] ffff888102791780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.029967] >ffff888102791800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 13.030276] ^ [ 13.030586] ffff888102791880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.030942] ffff888102791900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.031390] ==================================================================