Date
July 23, 2025, 2:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.562051] ================================================================== [ 15.562119] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 15.562172] Read of size 1 at addr fff00000c3f904a8 by task kunit_try_catch/188 [ 15.562225] [ 15.562256] CPU: 1 UID: 0 PID: 188 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7 #1 PREEMPT [ 15.562338] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.562366] Hardware name: linux,dummy-virt (DT) [ 15.562398] Call trace: [ 15.562421] show_stack+0x20/0x38 (C) [ 15.562477] dump_stack_lvl+0x8c/0xd0 [ 15.562537] print_report+0x118/0x5d0 [ 15.563030] kasan_report+0xdc/0x128 [ 15.563082] __asan_report_load1_noabort+0x20/0x30 [ 15.563519] kmalloc_uaf2+0x3f4/0x468 [ 15.563590] kunit_try_run_case+0x170/0x3f0 [ 15.563659] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.563862] kthread+0x328/0x630 [ 15.564061] ret_from_fork+0x10/0x20 [ 15.564504] [ 15.564532] Allocated by task 188: [ 15.564937] kasan_save_stack+0x3c/0x68 [ 15.564995] kasan_save_track+0x20/0x40 [ 15.565210] kasan_save_alloc_info+0x40/0x58 [ 15.565399] __kasan_kmalloc+0xd4/0xd8 [ 15.565474] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.565812] kmalloc_uaf2+0xc4/0x468 [ 15.566016] kunit_try_run_case+0x170/0x3f0 [ 15.566284] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.566395] kthread+0x328/0x630 [ 15.566469] ret_from_fork+0x10/0x20 [ 15.566668] [ 15.566766] Freed by task 188: [ 15.566827] kasan_save_stack+0x3c/0x68 [ 15.567071] kasan_save_track+0x20/0x40 [ 15.567357] kasan_save_free_info+0x4c/0x78 [ 15.567497] __kasan_slab_free+0x6c/0x98 [ 15.567609] kfree+0x214/0x3c8 [ 15.567869] kmalloc_uaf2+0x134/0x468 [ 15.568010] kunit_try_run_case+0x170/0x3f0 [ 15.568202] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.568300] kthread+0x328/0x630 [ 15.568437] ret_from_fork+0x10/0x20 [ 15.568508] [ 15.568549] The buggy address belongs to the object at fff00000c3f90480 [ 15.568549] which belongs to the cache kmalloc-64 of size 64 [ 15.568863] The buggy address is located 40 bytes inside of [ 15.568863] freed 64-byte region [fff00000c3f90480, fff00000c3f904c0) [ 15.569208] [ 15.569251] The buggy address belongs to the physical page: [ 15.569421] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103f90 [ 15.569704] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.569793] page_type: f5(slab) [ 15.569971] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 15.570054] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 15.570152] page dumped because: kasan: bad access detected [ 15.570275] [ 15.570364] Memory state around the buggy address: [ 15.570645] fff00000c3f90380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 15.570900] fff00000c3f90400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 15.571048] >fff00000c3f90480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 15.571201] ^ [ 15.571355] fff00000c3f90500: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 15.571429] fff00000c3f90580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.571747] ==================================================================
[ 12.897708] ================================================================== [ 12.898252] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 12.898587] Read of size 1 at addr ffff888102b02e28 by task kunit_try_catch/205 [ 12.899182] [ 12.899506] CPU: 0 UID: 0 PID: 205 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7 #1 PREEMPT(voluntary) [ 12.899554] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.899741] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.899766] Call Trace: [ 12.899780] <TASK> [ 12.899795] dump_stack_lvl+0x73/0xb0 [ 12.899839] print_report+0xd1/0x610 [ 12.899861] ? __virt_addr_valid+0x1db/0x2d0 [ 12.899883] ? kmalloc_uaf2+0x4a8/0x520 [ 12.899902] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.899923] ? kmalloc_uaf2+0x4a8/0x520 [ 12.899942] kasan_report+0x141/0x180 [ 12.899963] ? kmalloc_uaf2+0x4a8/0x520 [ 12.899987] __asan_report_load1_noabort+0x18/0x20 [ 12.900010] kmalloc_uaf2+0x4a8/0x520 [ 12.900030] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 12.900049] ? finish_task_switch.isra.0+0x153/0x700 [ 12.900070] ? __switch_to+0x47/0xf50 [ 12.900118] ? __schedule+0x10c6/0x2b60 [ 12.900140] ? __pfx_read_tsc+0x10/0x10 [ 12.900159] ? ktime_get_ts64+0x86/0x230 [ 12.900182] kunit_try_run_case+0x1a5/0x480 [ 12.900230] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.900252] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.900275] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.900297] ? __kthread_parkme+0x82/0x180 [ 12.900316] ? preempt_count_sub+0x50/0x80 [ 12.900338] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.900361] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.900383] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.900407] kthread+0x337/0x6f0 [ 12.900426] ? trace_preempt_on+0x20/0xc0 [ 12.900448] ? __pfx_kthread+0x10/0x10 [ 12.900468] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.900488] ? calculate_sigpending+0x7b/0xa0 [ 12.900512] ? __pfx_kthread+0x10/0x10 [ 12.900532] ret_from_fork+0x116/0x1d0 [ 12.900550] ? __pfx_kthread+0x10/0x10 [ 12.900570] ret_from_fork_asm+0x1a/0x30 [ 12.900600] </TASK> [ 12.900610] [ 12.911072] Allocated by task 205: [ 12.911730] kasan_save_stack+0x45/0x70 [ 12.911927] kasan_save_track+0x18/0x40 [ 12.912071] kasan_save_alloc_info+0x3b/0x50 [ 12.912360] __kasan_kmalloc+0xb7/0xc0 [ 12.912621] __kmalloc_cache_noprof+0x189/0x420 [ 12.912857] kmalloc_uaf2+0xc6/0x520 [ 12.913025] kunit_try_run_case+0x1a5/0x480 [ 12.913488] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.913797] kthread+0x337/0x6f0 [ 12.913936] ret_from_fork+0x116/0x1d0 [ 12.914227] ret_from_fork_asm+0x1a/0x30 [ 12.914699] [ 12.914798] Freed by task 205: [ 12.915037] kasan_save_stack+0x45/0x70 [ 12.915360] kasan_save_track+0x18/0x40 [ 12.915644] kasan_save_free_info+0x3f/0x60 [ 12.915922] __kasan_slab_free+0x56/0x70 [ 12.916169] kfree+0x222/0x3f0 [ 12.916390] kmalloc_uaf2+0x14c/0x520 [ 12.916562] kunit_try_run_case+0x1a5/0x480 [ 12.916747] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.917000] kthread+0x337/0x6f0 [ 12.917432] ret_from_fork+0x116/0x1d0 [ 12.917610] ret_from_fork_asm+0x1a/0x30 [ 12.917801] [ 12.918029] The buggy address belongs to the object at ffff888102b02e00 [ 12.918029] which belongs to the cache kmalloc-64 of size 64 [ 12.918668] The buggy address is located 40 bytes inside of [ 12.918668] freed 64-byte region [ffff888102b02e00, ffff888102b02e40) [ 12.919164] [ 12.919250] The buggy address belongs to the physical page: [ 12.919505] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b02 [ 12.919840] flags: 0x200000000000000(node=0|zone=2) [ 12.920066] page_type: f5(slab) [ 12.920851] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 12.921143] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 12.921710] page dumped because: kasan: bad access detected [ 12.922076] [ 12.922169] Memory state around the buggy address: [ 12.922537] ffff888102b02d00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 12.923010] ffff888102b02d80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 12.923450] >ffff888102b02e00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 12.923747] ^ [ 12.923957] ffff888102b02e80: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 12.924658] ffff888102b02f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.924965] ==================================================================