Date
July 23, 2025, 3:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.190127] ================================================================== [ 31.190214] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 31.190273] Read of size 1 at addr fff00000c9a6faa8 by task kunit_try_catch/221 [ 31.190326] [ 31.190375] CPU: 0 UID: 0 PID: 221 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250723 #1 PREEMPT [ 31.190467] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 31.190507] Hardware name: linux,dummy-virt (DT) [ 31.190539] Call trace: [ 31.190561] show_stack+0x20/0x38 (C) [ 31.190611] dump_stack_lvl+0x8c/0xd0 [ 31.190659] print_report+0x118/0x5e8 [ 31.190704] kasan_report+0xdc/0x128 [ 31.190747] __asan_report_load1_noabort+0x20/0x30 [ 31.190796] kmalloc_uaf2+0x3f4/0x468 [ 31.190841] kunit_try_run_case+0x170/0x3f0 [ 31.190894] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.191764] kthread+0x328/0x630 [ 31.191830] ret_from_fork+0x10/0x20 [ 31.192181] [ 31.192218] Allocated by task 221: [ 31.192250] kasan_save_stack+0x3c/0x68 [ 31.192299] kasan_save_track+0x20/0x40 [ 31.192335] kasan_save_alloc_info+0x40/0x58 [ 31.192373] __kasan_kmalloc+0xd4/0xd8 [ 31.192569] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.192812] kmalloc_uaf2+0xc4/0x468 [ 31.193050] kunit_try_run_case+0x170/0x3f0 [ 31.193250] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.193321] kthread+0x328/0x630 [ 31.193464] ret_from_fork+0x10/0x20 [ 31.193540] [ 31.193559] Freed by task 221: [ 31.193801] kasan_save_stack+0x3c/0x68 [ 31.193978] kasan_save_track+0x20/0x40 [ 31.194088] kasan_save_free_info+0x4c/0x78 [ 31.194145] __kasan_slab_free+0x6c/0x98 [ 31.194340] kfree+0x214/0x3c8 [ 31.194577] kmalloc_uaf2+0x134/0x468 [ 31.194730] kunit_try_run_case+0x170/0x3f0 [ 31.194821] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.194882] kthread+0x328/0x630 [ 31.195080] ret_from_fork+0x10/0x20 [ 31.195336] [ 31.195362] The buggy address belongs to the object at fff00000c9a6fa80 [ 31.195362] which belongs to the cache kmalloc-64 of size 64 [ 31.195635] The buggy address is located 40 bytes inside of [ 31.195635] freed 64-byte region [fff00000c9a6fa80, fff00000c9a6fac0) [ 31.195858] [ 31.195882] The buggy address belongs to the physical page: [ 31.195952] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109a6f [ 31.196468] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.196577] page_type: f5(slab) [ 31.196747] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 31.196987] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 31.197127] page dumped because: kasan: bad access detected [ 31.197191] [ 31.197255] Memory state around the buggy address: [ 31.197327] fff00000c9a6f980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.197538] fff00000c9a6fa00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.197705] >fff00000c9a6fa80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.197936] ^ [ 31.198154] fff00000c9a6fb00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 31.198284] fff00000c9a6fb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.198367] ==================================================================
[ 25.495319] ================================================================== [ 25.496596] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 25.497246] Read of size 1 at addr ffff8881055e70a8 by task kunit_try_catch/237 [ 25.497942] [ 25.498128] CPU: 1 UID: 0 PID: 237 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250723 #1 PREEMPT(voluntary) [ 25.498188] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.498200] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.498221] Call Trace: [ 25.498235] <TASK> [ 25.498252] dump_stack_lvl+0x73/0xb0 [ 25.498281] print_report+0xd1/0x640 [ 25.498304] ? __virt_addr_valid+0x1db/0x2d0 [ 25.498329] ? kmalloc_uaf2+0x4a8/0x520 [ 25.498358] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.498384] ? kmalloc_uaf2+0x4a8/0x520 [ 25.498404] kasan_report+0x141/0x180 [ 25.498426] ? kmalloc_uaf2+0x4a8/0x520 [ 25.498450] __asan_report_load1_noabort+0x18/0x20 [ 25.498474] kmalloc_uaf2+0x4a8/0x520 [ 25.498495] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 25.498514] ? finish_task_switch.isra.0+0x153/0x700 [ 25.498537] ? __switch_to+0x47/0xf80 [ 25.498563] ? __schedule+0x10da/0x2b60 [ 25.498588] ? __pfx_read_tsc+0x10/0x10 [ 25.498610] ? ktime_get_ts64+0x86/0x230 [ 25.498636] kunit_try_run_case+0x1a5/0x480 [ 25.498660] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.498683] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.498708] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.498735] ? __kthread_parkme+0x82/0x180 [ 25.498756] ? preempt_count_sub+0x50/0x80 [ 25.498779] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.498803] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.498826] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.498849] kthread+0x337/0x6f0 [ 25.498869] ? trace_preempt_on+0x20/0xc0 [ 25.498893] ? __pfx_kthread+0x10/0x10 [ 25.498914] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.498937] ? calculate_sigpending+0x7b/0xa0 [ 25.498970] ? __pfx_kthread+0x10/0x10 [ 25.498991] ret_from_fork+0x116/0x1d0 [ 25.499011] ? __pfx_kthread+0x10/0x10 [ 25.499031] ret_from_fork_asm+0x1a/0x30 [ 25.499061] </TASK> [ 25.499072] [ 25.510421] Allocated by task 237: [ 25.510783] kasan_save_stack+0x45/0x70 [ 25.511166] kasan_save_track+0x18/0x40 [ 25.511554] kasan_save_alloc_info+0x3b/0x50 [ 25.512043] __kasan_kmalloc+0xb7/0xc0 [ 25.512180] __kmalloc_cache_noprof+0x189/0x420 [ 25.512331] kmalloc_uaf2+0xc6/0x520 [ 25.512497] kunit_try_run_case+0x1a5/0x480 [ 25.512642] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.512812] kthread+0x337/0x6f0 [ 25.512927] ret_from_fork+0x116/0x1d0 [ 25.513054] ret_from_fork_asm+0x1a/0x30 [ 25.513340] [ 25.513527] Freed by task 237: [ 25.513831] kasan_save_stack+0x45/0x70 [ 25.514195] kasan_save_track+0x18/0x40 [ 25.514598] kasan_save_free_info+0x3f/0x60 [ 25.515026] __kasan_slab_free+0x56/0x70 [ 25.515382] kfree+0x222/0x3f0 [ 25.515668] kmalloc_uaf2+0x14c/0x520 [ 25.516063] kunit_try_run_case+0x1a5/0x480 [ 25.516464] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.517015] kthread+0x337/0x6f0 [ 25.517310] ret_from_fork+0x116/0x1d0 [ 25.517634] ret_from_fork_asm+0x1a/0x30 [ 25.518019] [ 25.518367] The buggy address belongs to the object at ffff8881055e7080 [ 25.518367] which belongs to the cache kmalloc-64 of size 64 [ 25.519236] The buggy address is located 40 bytes inside of [ 25.519236] freed 64-byte region [ffff8881055e7080, ffff8881055e70c0) [ 25.520301] [ 25.520545] The buggy address belongs to the physical page: [ 25.520771] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1055e7 [ 25.521530] flags: 0x200000000000000(node=0|zone=2) [ 25.522080] page_type: f5(slab) [ 25.522414] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 25.523154] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 25.523610] page dumped because: kasan: bad access detected [ 25.523930] [ 25.524117] Memory state around the buggy address: [ 25.524287] ffff8881055e6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.524806] ffff8881055e7000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 25.525474] >ffff8881055e7080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 25.526162] ^ [ 25.526648] ffff8881055e7100: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 25.526940] ffff8881055e7180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.527685] ==================================================================