Date
July 3, 2025, 3:13 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.768806] ================================================================== [ 15.769261] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 15.769477] Read of size 1 at addr fff00000c55f0940 by task kunit_try_catch/195 [ 15.769588] [ 15.769633] CPU: 1 UID: 0 PID: 195 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT [ 15.769716] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.770159] Hardware name: linux,dummy-virt (DT) [ 15.770217] Call trace: [ 15.770502] show_stack+0x20/0x38 (C) [ 15.770566] dump_stack_lvl+0x8c/0xd0 [ 15.770615] print_report+0x118/0x608 [ 15.770658] kasan_report+0xdc/0x128 [ 15.770701] __kasan_check_byte+0x54/0x70 [ 15.770983] kfree_sensitive+0x30/0xb0 [ 15.771345] kmalloc_double_kzfree+0x168/0x308 [ 15.771462] kunit_try_run_case+0x170/0x3f0 [ 15.771579] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.771729] kthread+0x328/0x630 [ 15.771817] ret_from_fork+0x10/0x20 [ 15.772068] [ 15.772130] Allocated by task 195: [ 15.772162] kasan_save_stack+0x3c/0x68 [ 15.772570] kasan_save_track+0x20/0x40 [ 15.772704] kasan_save_alloc_info+0x40/0x58 [ 15.772884] __kasan_kmalloc+0xd4/0xd8 [ 15.773051] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.773271] kmalloc_double_kzfree+0xb8/0x308 [ 15.773318] kunit_try_run_case+0x170/0x3f0 [ 15.773490] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.773973] kthread+0x328/0x630 [ 15.774058] ret_from_fork+0x10/0x20 [ 15.774224] [ 15.774301] Freed by task 195: [ 15.774332] kasan_save_stack+0x3c/0x68 [ 15.774569] kasan_save_track+0x20/0x40 [ 15.774699] kasan_save_free_info+0x4c/0x78 [ 15.774778] __kasan_slab_free+0x6c/0x98 [ 15.774855] kfree+0x214/0x3c8 [ 15.774887] kfree_sensitive+0x80/0xb0 [ 15.775101] kmalloc_double_kzfree+0x11c/0x308 [ 15.775292] kunit_try_run_case+0x170/0x3f0 [ 15.775339] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.775427] kthread+0x328/0x630 [ 15.775839] ret_from_fork+0x10/0x20 [ 15.776026] [ 15.776375] The buggy address belongs to the object at fff00000c55f0940 [ 15.776375] which belongs to the cache kmalloc-16 of size 16 [ 15.776612] The buggy address is located 0 bytes inside of [ 15.776612] freed 16-byte region [fff00000c55f0940, fff00000c55f0950) [ 15.776857] [ 15.776891] The buggy address belongs to the physical page: [ 15.776942] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1055f0 [ 15.777008] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.777057] page_type: f5(slab) [ 15.777121] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.777189] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.777229] page dumped because: kasan: bad access detected [ 15.777261] [ 15.777279] Memory state around the buggy address: [ 15.777327] fff00000c55f0800: 00 02 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.777390] fff00000c55f0880: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.777433] >fff00000c55f0900: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 15.777472] ^ [ 15.777506] fff00000c55f0980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.777549] fff00000c55f0a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.777613] ==================================================================
[ 11.525062] ================================================================== [ 11.526019] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 11.526352] Read of size 1 at addr ffff888102224120 by task kunit_try_catch/211 [ 11.526643] [ 11.526761] CPU: 0 UID: 0 PID: 211 Comm: kunit_try_catch Tainted: G B N 6.15.5-rc1 #1 PREEMPT(voluntary) [ 11.526806] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.526818] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.526841] Call Trace: [ 11.526854] <TASK> [ 11.526872] dump_stack_lvl+0x73/0xb0 [ 11.526898] print_report+0xd1/0x650 [ 11.526920] ? __virt_addr_valid+0x1db/0x2d0 [ 11.526942] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.526961] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.526984] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.527003] kasan_report+0x141/0x180 [ 11.527026] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.527049] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.527069] __kasan_check_byte+0x3d/0x50 [ 11.527091] kfree_sensitive+0x22/0x90 [ 11.527115] kmalloc_double_kzfree+0x19c/0x350 [ 11.527134] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 11.527155] ? __schedule+0x10cc/0x2b60 [ 11.527178] ? __pfx_read_tsc+0x10/0x10 [ 11.527198] ? ktime_get_ts64+0x86/0x230 [ 11.527224] kunit_try_run_case+0x1a5/0x480 [ 11.527260] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.527282] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.527308] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.527333] ? __kthread_parkme+0x82/0x180 [ 11.527356] ? preempt_count_sub+0x50/0x80 [ 11.527382] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.527405] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.527428] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.527451] kthread+0x337/0x6f0 [ 11.527467] ? trace_preempt_on+0x20/0xc0 [ 11.527496] ? __pfx_kthread+0x10/0x10 [ 11.527514] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.527536] ? calculate_sigpending+0x7b/0xa0 [ 11.527558] ? __pfx_kthread+0x10/0x10 [ 11.527578] ret_from_fork+0x41/0x80 [ 11.527599] ? __pfx_kthread+0x10/0x10 [ 11.527617] ret_from_fork_asm+0x1a/0x30 [ 11.527648] </TASK> [ 11.527680] [ 11.538175] Allocated by task 211: [ 11.538610] kasan_save_stack+0x45/0x70 [ 11.538913] kasan_save_track+0x18/0x40 [ 11.539363] kasan_save_alloc_info+0x3b/0x50 [ 11.539709] __kasan_kmalloc+0xb7/0xc0 [ 11.539897] __kmalloc_cache_noprof+0x189/0x420 [ 11.540098] kmalloc_double_kzfree+0xa9/0x350 [ 11.540313] kunit_try_run_case+0x1a5/0x480 [ 11.540508] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.541209] kthread+0x337/0x6f0 [ 11.541823] ret_from_fork+0x41/0x80 [ 11.542079] ret_from_fork_asm+0x1a/0x30 [ 11.542573] [ 11.542689] Freed by task 211: [ 11.542981] kasan_save_stack+0x45/0x70 [ 11.543171] kasan_save_track+0x18/0x40 [ 11.543442] kasan_save_free_info+0x3f/0x60 [ 11.543630] __kasan_slab_free+0x56/0x70 [ 11.543811] kfree+0x222/0x3f0 [ 11.543959] kfree_sensitive+0x67/0x90 [ 11.544128] kmalloc_double_kzfree+0x12b/0x350 [ 11.544791] kunit_try_run_case+0x1a5/0x480 [ 11.545097] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.545702] kthread+0x337/0x6f0 [ 11.546261] ret_from_fork+0x41/0x80 [ 11.546454] ret_from_fork_asm+0x1a/0x30 [ 11.546915] [ 11.547018] The buggy address belongs to the object at ffff888102224120 [ 11.547018] which belongs to the cache kmalloc-16 of size 16 [ 11.547971] The buggy address is located 0 bytes inside of [ 11.547971] freed 16-byte region [ffff888102224120, ffff888102224130) [ 11.548879] [ 11.548980] The buggy address belongs to the physical page: [ 11.549213] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102224 [ 11.549479] flags: 0x200000000000000(node=0|zone=2) [ 11.550079] page_type: f5(slab) [ 11.550250] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 11.550723] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 11.550997] page dumped because: kasan: bad access detected [ 11.551266] [ 11.551351] Memory state around the buggy address: [ 11.551565] ffff888102224000: 00 02 fc fc 00 02 fc fc fa fb fc fc fa fb fc fc [ 11.551854] ffff888102224080: fa fb fc fc 00 05 fc fc fa fb fc fc fa fb fc fc [ 11.552167] >ffff888102224100: fa fb fc fc fa fb fc fc fc fc fc fc fc fc fc fc [ 11.552453] ^ [ 11.552658] ffff888102224180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.553064] ffff888102224200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.553914] ==================================================================