Date
July 8, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.248205] ================================================================== [ 31.248302] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x300/0x338 [ 31.248547] Read of size 1 at addr fff00000c79816a8 by task kunit_try_catch/215 [ 31.248604] [ 31.248643] CPU: 0 UID: 0 PID: 215 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5-next-20250708 #1 PREEMPT [ 31.249088] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.249122] Hardware name: linux,dummy-virt (DT) [ 31.249314] Call trace: [ 31.249437] show_stack+0x20/0x38 (C) [ 31.249683] dump_stack_lvl+0x8c/0xd0 [ 31.249803] print_report+0x118/0x5d0 [ 31.249851] kasan_report+0xdc/0x128 [ 31.249942] __asan_report_load1_noabort+0x20/0x30 [ 31.250031] kmalloc_uaf+0x300/0x338 [ 31.250076] kunit_try_run_case+0x170/0x3f0 [ 31.250165] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.250231] kthread+0x328/0x630 [ 31.250272] ret_from_fork+0x10/0x20 [ 31.250854] [ 31.250887] Allocated by task 215: [ 31.250922] kasan_save_stack+0x3c/0x68 [ 31.250971] kasan_save_track+0x20/0x40 [ 31.251010] kasan_save_alloc_info+0x40/0x58 [ 31.251534] __kasan_kmalloc+0xd4/0xd8 [ 31.251637] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.251698] kmalloc_uaf+0xb8/0x338 [ 31.251734] kunit_try_run_case+0x170/0x3f0 [ 31.251775] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.251826] kthread+0x328/0x630 [ 31.251929] ret_from_fork+0x10/0x20 [ 31.251966] [ 31.251986] Freed by task 215: [ 31.252013] kasan_save_stack+0x3c/0x68 [ 31.252092] kasan_save_track+0x20/0x40 [ 31.252253] kasan_save_free_info+0x4c/0x78 [ 31.252303] __kasan_slab_free+0x6c/0x98 [ 31.252443] kfree+0x214/0x3c8 [ 31.252483] kmalloc_uaf+0x11c/0x338 [ 31.252866] kunit_try_run_case+0x170/0x3f0 [ 31.252916] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.252968] kthread+0x328/0x630 [ 31.253001] ret_from_fork+0x10/0x20 [ 31.253416] [ 31.253439] The buggy address belongs to the object at fff00000c79816a0 [ 31.253439] which belongs to the cache kmalloc-16 of size 16 [ 31.253711] The buggy address is located 8 bytes inside of [ 31.253711] freed 16-byte region [fff00000c79816a0, fff00000c79816b0) [ 31.253790] [ 31.253813] The buggy address belongs to the physical page: [ 31.253846] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107981 [ 31.253903] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.253954] page_type: f5(slab) [ 31.253997] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 31.254047] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 31.254099] page dumped because: kasan: bad access detected [ 31.254131] [ 31.254149] Memory state around the buggy address: [ 31.254542] fff00000c7981580: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.254790] fff00000c7981600: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.254881] >fff00000c7981680: fa fb fc fc fa fb fc fc fc fc fc fc fc fc fc fc [ 31.254954] ^ [ 31.255010] fff00000c7981700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.255051] fff00000c7981780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.255111] ==================================================================
[ 23.592463] ================================================================== [ 23.593216] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380 [ 23.593458] Read of size 1 at addr ffff8881025fe5e8 by task kunit_try_catch/232 [ 23.593676] [ 23.593773] CPU: 1 UID: 0 PID: 232 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5-next-20250708 #1 PREEMPT(voluntary) [ 23.593826] Tainted: [B]=BAD_PAGE, [N]=TEST [ 23.593838] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 23.593862] Call Trace: [ 23.593876] <TASK> [ 23.593896] dump_stack_lvl+0x73/0xb0 [ 23.593927] print_report+0xd1/0x610 [ 23.593950] ? __virt_addr_valid+0x1db/0x2d0 [ 23.593976] ? kmalloc_uaf+0x320/0x380 [ 23.593996] ? kasan_complete_mode_report_info+0x64/0x200 [ 23.594024] ? kmalloc_uaf+0x320/0x380 [ 23.594045] kasan_report+0x141/0x180 [ 23.594067] ? kmalloc_uaf+0x320/0x380 [ 23.594092] __asan_report_load1_noabort+0x18/0x20 [ 23.594119] kmalloc_uaf+0x320/0x380 [ 23.594139] ? __pfx_kmalloc_uaf+0x10/0x10 [ 23.594160] ? __schedule+0x10cc/0x2b60 [ 23.594188] ? __pfx_read_tsc+0x10/0x10 [ 23.594214] ? ktime_get_ts64+0x86/0x230 [ 23.594715] kunit_try_run_case+0x1a5/0x480 [ 23.595049] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.595075] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 23.595099] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 23.595128] ? __kthread_parkme+0x82/0x180 [ 23.595150] ? preempt_count_sub+0x50/0x80 [ 23.595191] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.595214] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.595252] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 23.595279] kthread+0x337/0x6f0 [ 23.595300] ? trace_preempt_on+0x20/0xc0 [ 23.595326] ? __pfx_kthread+0x10/0x10 [ 23.595348] ? _raw_spin_unlock_irq+0x47/0x80 [ 23.595376] ? calculate_sigpending+0x7b/0xa0 [ 23.595403] ? __pfx_kthread+0x10/0x10 [ 23.595427] ret_from_fork+0x116/0x1d0 [ 23.595446] ? __pfx_kthread+0x10/0x10 [ 23.595468] ret_from_fork_asm+0x1a/0x30 [ 23.595502] </TASK> [ 23.595514] [ 23.608926] Allocated by task 232: [ 23.609472] kasan_save_stack+0x45/0x70 [ 23.610079] kasan_save_track+0x18/0x40 [ 23.610609] kasan_save_alloc_info+0x3b/0x50 [ 23.611135] __kasan_kmalloc+0xb7/0xc0 [ 23.611547] __kmalloc_cache_noprof+0x189/0x420 [ 23.612101] kmalloc_uaf+0xaa/0x380 [ 23.612493] kunit_try_run_case+0x1a5/0x480 [ 23.613016] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.613840] kthread+0x337/0x6f0 [ 23.614094] ret_from_fork+0x116/0x1d0 [ 23.614230] ret_from_fork_asm+0x1a/0x30 [ 23.614377] [ 23.614443] Freed by task 232: [ 23.614550] kasan_save_stack+0x45/0x70 [ 23.614678] kasan_save_track+0x18/0x40 [ 23.615135] kasan_save_free_info+0x3f/0x60 [ 23.615586] __kasan_slab_free+0x56/0x70 [ 23.616160] kfree+0x222/0x3f0 [ 23.616522] kmalloc_uaf+0x12c/0x380 [ 23.617028] kunit_try_run_case+0x1a5/0x480 [ 23.617480] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.618090] kthread+0x337/0x6f0 [ 23.618449] ret_from_fork+0x116/0x1d0 [ 23.618837] ret_from_fork_asm+0x1a/0x30 [ 23.619217] [ 23.619298] The buggy address belongs to the object at ffff8881025fe5e0 [ 23.619298] which belongs to the cache kmalloc-16 of size 16 [ 23.619650] The buggy address is located 8 bytes inside of [ 23.619650] freed 16-byte region [ffff8881025fe5e0, ffff8881025fe5f0) [ 23.620677] [ 23.620875] The buggy address belongs to the physical page: [ 23.621589] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1025fe [ 23.622658] flags: 0x200000000000000(node=0|zone=2) [ 23.623150] page_type: f5(slab) [ 23.623336] raw: 0200000000000000 ffff888100041640 dead000000000100 dead000000000122 [ 23.623562] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 23.623862] page dumped because: kasan: bad access detected [ 23.624114] [ 23.624205] Memory state around the buggy address: [ 23.624412] ffff8881025fe480: 00 06 fc fc 00 06 fc fc fa fb fc fc fa fb fc fc [ 23.624699] ffff8881025fe500: 00 00 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 23.625115] >ffff8881025fe580: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 23.625406] ^ [ 23.625676] ffff8881025fe600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.626038] ffff8881025fe680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.626354] ==================================================================