Date
May 13, 2025, 12:07 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 19.492069] ================================================================== [ 19.492215] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 19.492356] Read of size 1 at addr fff00000c4035120 by task kunit_try_catch/192 [ 19.492421] [ 19.492493] CPU: 1 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc6-next-20250513 #1 PREEMPT [ 19.492827] Tainted: [B]=BAD_PAGE, [N]=TEST [ 19.492891] Hardware name: linux,dummy-virt (DT) [ 19.492938] Call trace: [ 19.492968] show_stack+0x20/0x38 (C) [ 19.493337] dump_stack_lvl+0x8c/0xd0 [ 19.493456] print_report+0x118/0x608 [ 19.493510] kasan_report+0xdc/0x128 [ 19.493562] __kasan_check_byte+0x54/0x70 [ 19.493612] kfree_sensitive+0x30/0xb0 [ 19.493664] kmalloc_double_kzfree+0x168/0x308 [ 19.493714] kunit_try_run_case+0x170/0x3f0 [ 19.493775] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.493896] kthread+0x328/0x630 [ 19.494041] ret_from_fork+0x10/0x20 [ 19.494213] [ 19.494263] Allocated by task 192: [ 19.494308] kasan_save_stack+0x3c/0x68 [ 19.494364] kasan_save_track+0x20/0x40 [ 19.494408] kasan_save_alloc_info+0x40/0x58 [ 19.494469] __kasan_kmalloc+0xd4/0xd8 [ 19.494514] __kmalloc_cache_noprof+0x15c/0x3c0 [ 19.494559] kmalloc_double_kzfree+0xb8/0x308 [ 19.494603] kunit_try_run_case+0x170/0x3f0 [ 19.494665] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.494716] kthread+0x328/0x630 [ 19.494760] ret_from_fork+0x10/0x20 [ 19.494800] [ 19.494824] Freed by task 192: [ 19.494853] kasan_save_stack+0x3c/0x68 [ 19.494895] kasan_save_track+0x20/0x40 [ 19.494937] kasan_save_free_info+0x4c/0x78 [ 19.494990] __kasan_slab_free+0x6c/0x98 [ 19.495037] kfree+0x214/0x3c8 [ 19.495073] kfree_sensitive+0x80/0xb0 [ 19.495115] kmalloc_double_kzfree+0x11c/0x308 [ 19.495159] kunit_try_run_case+0x170/0x3f0 [ 19.495943] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.496067] kthread+0x328/0x630 [ 19.496127] ret_from_fork+0x10/0x20 [ 19.496171] [ 19.496200] The buggy address belongs to the object at fff00000c4035120 [ 19.496200] which belongs to the cache kmalloc-16 of size 16 [ 19.496269] The buggy address is located 0 bytes inside of [ 19.496269] freed 16-byte region [fff00000c4035120, fff00000c4035130) [ 19.496334] [ 19.496360] The buggy address belongs to the physical page: [ 19.496399] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104035 [ 19.496459] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 19.496518] page_type: f5(slab) [ 19.496989] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 19.497422] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 19.497661] page dumped because: kasan: bad access detected [ 19.497706] [ 19.497728] Memory state around the buggy address: [ 19.497768] fff00000c4035000: 00 02 fc fc 00 05 fc fc fa fb fc fc fa fb fc fc [ 19.497839] fff00000c4035080: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 19.497891] >fff00000c4035100: fa fb fc fc fa fb fc fc fc fc fc fc fc fc fc fc [ 19.497952] ^ [ 19.498823] fff00000c4035180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.499117] fff00000c4035200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.499613] ==================================================================
[ 11.465356] ================================================================== [ 11.466493] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 11.467095] Read of size 1 at addr ffff888101c869a0 by task kunit_try_catch/209 [ 11.467708] [ 11.467893] CPU: 1 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc6-next-20250513 #1 PREEMPT(voluntary) [ 11.467944] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.467955] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.467975] Call Trace: [ 11.467987] <TASK> [ 11.468004] dump_stack_lvl+0x73/0xb0 [ 11.468034] print_report+0xd1/0x650 [ 11.468057] ? __virt_addr_valid+0x1db/0x2d0 [ 11.468081] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.468103] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.468125] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.468149] kasan_report+0x141/0x180 [ 11.468172] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.468200] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.468223] __kasan_check_byte+0x3d/0x50 [ 11.468246] kfree_sensitive+0x22/0x90 [ 11.468271] kmalloc_double_kzfree+0x19c/0x350 [ 11.468294] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 11.468320] ? __pfx_queued_spin_lock_slowpath+0x10/0x10 [ 11.468344] ? __pfx_read_tsc+0x10/0x10 [ 11.468364] ? ktime_get_ts64+0x86/0x230 [ 11.468389] kunit_try_run_case+0x1a5/0x480 [ 11.468413] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.468434] ? _raw_spin_lock_irqsave+0xf9/0x100 [ 11.468455] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.468478] ? __kthread_parkme+0x82/0x180 [ 11.468498] ? preempt_count_sub+0x50/0x80 [ 11.468523] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.468547] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.468570] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.468592] kthread+0x337/0x6f0 [ 11.468622] ? trace_preempt_on+0x20/0xc0 [ 11.468717] ? __pfx_kthread+0x10/0x10 [ 11.468739] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.468759] ? calculate_sigpending+0x7b/0xa0 [ 11.468784] ? __pfx_kthread+0x10/0x10 [ 11.468806] ret_from_fork+0x116/0x1d0 [ 11.468824] ? __pfx_kthread+0x10/0x10 [ 11.468845] ret_from_fork_asm+0x1a/0x30 [ 11.468881] </TASK> [ 11.468892] [ 11.479641] Allocated by task 209: [ 11.479968] kasan_save_stack+0x45/0x70 [ 11.480166] kasan_save_track+0x18/0x40 [ 11.480491] kasan_save_alloc_info+0x3b/0x50 [ 11.480859] __kasan_kmalloc+0xb7/0xc0 [ 11.481062] __kmalloc_cache_noprof+0x189/0x420 [ 11.481431] kmalloc_double_kzfree+0xa9/0x350 [ 11.481769] kunit_try_run_case+0x1a5/0x480 [ 11.481935] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.482184] kthread+0x337/0x6f0 [ 11.482652] ret_from_fork+0x116/0x1d0 [ 11.482851] ret_from_fork_asm+0x1a/0x30 [ 11.483281] [ 11.483385] Freed by task 209: [ 11.483534] kasan_save_stack+0x45/0x70 [ 11.484019] kasan_save_track+0x18/0x40 [ 11.484287] kasan_save_free_info+0x3f/0x60 [ 11.484495] __kasan_slab_free+0x56/0x70 [ 11.484873] kfree+0x222/0x3f0 [ 11.485046] kfree_sensitive+0x67/0x90 [ 11.485204] kmalloc_double_kzfree+0x12b/0x350 [ 11.485488] kunit_try_run_case+0x1a5/0x480 [ 11.485728] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.486212] kthread+0x337/0x6f0 [ 11.486396] ret_from_fork+0x116/0x1d0 [ 11.486668] ret_from_fork_asm+0x1a/0x30 [ 11.486828] [ 11.486922] The buggy address belongs to the object at ffff888101c869a0 [ 11.486922] which belongs to the cache kmalloc-16 of size 16 [ 11.487768] The buggy address is located 0 bytes inside of [ 11.487768] freed 16-byte region [ffff888101c869a0, ffff888101c869b0) [ 11.488339] [ 11.488673] The buggy address belongs to the physical page: [ 11.489007] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101c86 [ 11.489509] flags: 0x200000000000000(node=0|zone=2) [ 11.489889] page_type: f5(slab) [ 11.490074] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 11.490531] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 11.490947] page dumped because: kasan: bad access detected [ 11.491192] [ 11.491464] Memory state around the buggy address: [ 11.491781] ffff888101c86880: 00 00 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 11.492293] ffff888101c86900: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 11.492845] >ffff888101c86980: fa fb fc fc fa fb fc fc fc fc fc fc fc fc fc fc [ 11.493232] ^ [ 11.493448] ffff888101c86a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.494061] ffff888101c86a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.494359] ==================================================================