Hay
Date
July 25, 2025, 3:13 a.m.

Environment
qemu-x86_64

[   25.671770] ==================================================================
[   25.672497] BUG: KASAN: slab-use-after-free in krealloc_uaf+0x1b8/0x5e0
[   25.672828] Read of size 1 at addr ffff8881049ae200 by task kunit_try_catch/213
[   25.673271] 
[   25.673397] CPU: 0 UID: 0 PID: 213 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7-next-20250725 #1 PREEMPT(voluntary) 
[   25.673448] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.673461] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.673483] Call Trace:
[   25.673496]  <TASK>
[   25.673513]  dump_stack_lvl+0x73/0xb0
[   25.673543]  print_report+0xd1/0x640
[   25.673566]  ? __virt_addr_valid+0x1db/0x2d0
[   25.673591]  ? krealloc_uaf+0x1b8/0x5e0
[   25.673611]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.673651]  ? krealloc_uaf+0x1b8/0x5e0
[   25.673673]  kasan_report+0x141/0x180
[   25.673704]  ? krealloc_uaf+0x1b8/0x5e0
[   25.673728]  ? krealloc_uaf+0x1b8/0x5e0
[   25.673750]  __kasan_check_byte+0x3d/0x50
[   25.673772]  krealloc_noprof+0x3f/0x340
[   25.673812]  krealloc_uaf+0x1b8/0x5e0
[   25.673834]  ? __pfx_krealloc_uaf+0x10/0x10
[   25.673854]  ? finish_task_switch.isra.0+0x153/0x700
[   25.673877]  ? __switch_to+0x47/0xf80
[   25.673904]  ? __schedule+0x10da/0x2b60
[   25.673926]  ? __pfx_read_tsc+0x10/0x10
[   25.673957]  ? ktime_get_ts64+0x86/0x230
[   25.673984]  kunit_try_run_case+0x1a5/0x480
[   25.674010]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.674033]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.674055]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.674082]  ? __kthread_parkme+0x82/0x180
[   25.674103]  ? preempt_count_sub+0x50/0x80
[   25.674126]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.674150]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.674174]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.674198]  kthread+0x337/0x6f0
[   25.674218]  ? trace_preempt_on+0x20/0xc0
[   25.674242]  ? __pfx_kthread+0x10/0x10
[   25.674263]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.674287]  ? calculate_sigpending+0x7b/0xa0
[   25.674311]  ? __pfx_kthread+0x10/0x10
[   25.674333]  ret_from_fork+0x116/0x1d0
[   25.674352]  ? __pfx_kthread+0x10/0x10
[   25.674372]  ret_from_fork_asm+0x1a/0x30
[   25.674404]  </TASK>
[   25.674415] 
[   25.684686] Allocated by task 213:
[   25.684905]  kasan_save_stack+0x45/0x70
[   25.685187]  kasan_save_track+0x18/0x40
[   25.685369]  kasan_save_alloc_info+0x3b/0x50
[   25.685573]  __kasan_kmalloc+0xb7/0xc0
[   25.685745]  __kmalloc_cache_noprof+0x189/0x420
[   25.686027]  krealloc_uaf+0xbb/0x5e0
[   25.686213]  kunit_try_run_case+0x1a5/0x480
[   25.686375]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.686552]  kthread+0x337/0x6f0
[   25.686671]  ret_from_fork+0x116/0x1d0
[   25.686803]  ret_from_fork_asm+0x1a/0x30
[   25.686964] 
[   25.687057] Freed by task 213:
[   25.687231]  kasan_save_stack+0x45/0x70
[   25.687420]  kasan_save_track+0x18/0x40
[   25.687607]  kasan_save_free_info+0x3f/0x60
[   25.687814]  __kasan_slab_free+0x5e/0x80
[   25.688011]  kfree+0x222/0x3f0
[   25.688313]  krealloc_uaf+0x13d/0x5e0
[   25.688548]  kunit_try_run_case+0x1a5/0x480
[   25.688702]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.689016]  kthread+0x337/0x6f0
[   25.689188]  ret_from_fork+0x116/0x1d0
[   25.689544]  ret_from_fork_asm+0x1a/0x30
[   25.689725] 
[   25.689869] The buggy address belongs to the object at ffff8881049ae200
[   25.689869]  which belongs to the cache kmalloc-256 of size 256
[   25.690448] The buggy address is located 0 bytes inside of
[   25.690448]  freed 256-byte region [ffff8881049ae200, ffff8881049ae300)
[   25.690959] 
[   25.691057] The buggy address belongs to the physical page:
[   25.691339] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1049ae
[   25.691620] head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[   25.691853] flags: 0x200000000000040(head|node=0|zone=2)
[   25.692042] page_type: f5(slab)
[   25.692166] raw: 0200000000000040 ffff888100041b40 dead000000000100 dead000000000122
[   25.692511] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   25.692857] head: 0200000000000040 ffff888100041b40 dead000000000100 dead000000000122
[   25.693328] head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   25.693569] head: 0200000000000001 ffffea0004126b81 00000000ffffffff 00000000ffffffff
[   25.693805] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
[   25.694378] page dumped because: kasan: bad access detected
[   25.694633] 
[   25.694721] Memory state around the buggy address:
[   25.695173]  ffff8881049ae100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.695495]  ffff8881049ae180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.695775] >ffff8881049ae200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   25.696126]                    ^
[   25.696259]  ffff8881049ae280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   25.696565]  ffff8881049ae300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.696836] ==================================================================
[   25.697618] ==================================================================
[   25.697864] BUG: KASAN: slab-use-after-free in krealloc_uaf+0x53c/0x5e0
[   25.698164] Read of size 1 at addr ffff8881049ae200 by task kunit_try_catch/213
[   25.698660] 
[   25.698751] CPU: 0 UID: 0 PID: 213 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7-next-20250725 #1 PREEMPT(voluntary) 
[   25.698835] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.698849] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.698869] Call Trace:
[   25.698882]  <TASK>
[   25.698896]  dump_stack_lvl+0x73/0xb0
[   25.698924]  print_report+0xd1/0x640
[   25.698958]  ? __virt_addr_valid+0x1db/0x2d0
[   25.698981]  ? krealloc_uaf+0x53c/0x5e0
[   25.699002]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.699028]  ? krealloc_uaf+0x53c/0x5e0
[   25.699050]  kasan_report+0x141/0x180
[   25.699080]  ? krealloc_uaf+0x53c/0x5e0
[   25.699106]  __asan_report_load1_noabort+0x18/0x20
[   25.699131]  krealloc_uaf+0x53c/0x5e0
[   25.699152]  ? __pfx_krealloc_uaf+0x10/0x10
[   25.699174]  ? finish_task_switch.isra.0+0x153/0x700
[   25.699197]  ? __switch_to+0x47/0xf80
[   25.699223]  ? __schedule+0x10da/0x2b60
[   25.699245]  ? __pfx_read_tsc+0x10/0x10
[   25.699266]  ? ktime_get_ts64+0x86/0x230
[   25.699292]  kunit_try_run_case+0x1a5/0x480
[   25.699316]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.699338]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.699360]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.699387]  ? __kthread_parkme+0x82/0x180
[   25.699408]  ? preempt_count_sub+0x50/0x80
[   25.699431]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.699455]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.699478]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.699502]  kthread+0x337/0x6f0
[   25.699522]  ? trace_preempt_on+0x20/0xc0
[   25.699545]  ? __pfx_kthread+0x10/0x10
[   25.699566]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.699590]  ? calculate_sigpending+0x7b/0xa0
[   25.699614]  ? __pfx_kthread+0x10/0x10
[   25.699635]  ret_from_fork+0x116/0x1d0
[   25.699654]  ? __pfx_kthread+0x10/0x10
[   25.699675]  ret_from_fork_asm+0x1a/0x30
[   25.699706]  </TASK>
[   25.699717] 
[   25.707284] Allocated by task 213:
[   25.707467]  kasan_save_stack+0x45/0x70
[   25.707628]  kasan_save_track+0x18/0x40
[   25.707761]  kasan_save_alloc_info+0x3b/0x50
[   25.707917]  __kasan_kmalloc+0xb7/0xc0
[   25.708069]  __kmalloc_cache_noprof+0x189/0x420
[   25.708293]  krealloc_uaf+0xbb/0x5e0
[   25.708475]  kunit_try_run_case+0x1a5/0x480
[   25.708662]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.708862]  kthread+0x337/0x6f0
[   25.709080]  ret_from_fork+0x116/0x1d0
[   25.709228]  ret_from_fork_asm+0x1a/0x30
[   25.709367] 
[   25.709432] Freed by task 213:
[   25.709542]  kasan_save_stack+0x45/0x70
[   25.709676]  kasan_save_track+0x18/0x40
[   25.709868]  kasan_save_free_info+0x3f/0x60
[   25.710099]  __kasan_slab_free+0x5e/0x80
[   25.710294]  kfree+0x222/0x3f0
[   25.710455]  krealloc_uaf+0x13d/0x5e0
[   25.710639]  kunit_try_run_case+0x1a5/0x480
[   25.710907]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.711201]  kthread+0x337/0x6f0
[   25.711370]  ret_from_fork+0x116/0x1d0
[   25.711556]  ret_from_fork_asm+0x1a/0x30
[   25.711747] 
[   25.712025] The buggy address belongs to the object at ffff8881049ae200
[   25.712025]  which belongs to the cache kmalloc-256 of size 256
[   25.712611] The buggy address is located 0 bytes inside of
[   25.712611]  freed 256-byte region [ffff8881049ae200, ffff8881049ae300)
[   25.713152] 
[   25.713225] The buggy address belongs to the physical page:
[   25.713447] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1049ae
[   25.713871] head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[   25.714252] flags: 0x200000000000040(head|node=0|zone=2)
[   25.714509] page_type: f5(slab)
[   25.714653] raw: 0200000000000040 ffff888100041b40 dead000000000100 dead000000000122
[   25.715039] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   25.715378] head: 0200000000000040 ffff888100041b40 dead000000000100 dead000000000122
[   25.715703] head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   25.716107] head: 0200000000000001 ffffea0004126b81 00000000ffffffff 00000000ffffffff
[   25.716421] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
[   25.716729] page dumped because: kasan: bad access detected
[   25.717130] 
[   25.717246] Memory state around the buggy address:
[   25.717464]  ffff8881049ae100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.717733]  ffff8881049ae180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.718091] >ffff8881049ae200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   25.718411]                    ^
[   25.718578]  ffff8881049ae280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   25.718887]  ffff8881049ae300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.719243] ==================================================================