Date
July 20, 2025, 8:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.300064] ================================================================== [ 15.300148] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x300/0x338 [ 15.300278] Read of size 1 at addr fff00000c6086768 by task kunit_try_catch/185 [ 15.300357] [ 15.300414] CPU: 1 UID: 0 PID: 185 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.300562] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.300589] Hardware name: linux,dummy-virt (DT) [ 15.300879] Call trace: [ 15.300959] show_stack+0x20/0x38 (C) [ 15.301055] dump_stack_lvl+0x8c/0xd0 [ 15.301731] print_report+0x118/0x5d0 [ 15.301792] kasan_report+0xdc/0x128 [ 15.301839] __asan_report_load1_noabort+0x20/0x30 [ 15.301919] kmalloc_uaf+0x300/0x338 [ 15.301982] kunit_try_run_case+0x170/0x3f0 [ 15.302304] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.302779] kthread+0x328/0x630 [ 15.302946] ret_from_fork+0x10/0x20 [ 15.303252] [ 15.303304] Allocated by task 185: [ 15.303345] kasan_save_stack+0x3c/0x68 [ 15.303916] kasan_save_track+0x20/0x40 [ 15.304024] kasan_save_alloc_info+0x40/0x58 [ 15.304069] __kasan_kmalloc+0xd4/0xd8 [ 15.304133] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.304536] kmalloc_uaf+0xb8/0x338 [ 15.304656] kunit_try_run_case+0x170/0x3f0 [ 15.304816] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.304928] kthread+0x328/0x630 [ 15.305006] ret_from_fork+0x10/0x20 [ 15.305114] [ 15.305196] Freed by task 185: [ 15.305310] kasan_save_stack+0x3c/0x68 [ 15.305389] kasan_save_track+0x20/0x40 [ 15.305490] kasan_save_free_info+0x4c/0x78 [ 15.305533] __kasan_slab_free+0x6c/0x98 [ 15.305571] kfree+0x214/0x3c8 [ 15.305609] kmalloc_uaf+0x11c/0x338 [ 15.305645] kunit_try_run_case+0x170/0x3f0 [ 15.305951] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.306111] kthread+0x328/0x630 [ 15.306179] ret_from_fork+0x10/0x20 [ 15.306264] [ 15.306301] The buggy address belongs to the object at fff00000c6086760 [ 15.306301] which belongs to the cache kmalloc-16 of size 16 [ 15.306375] The buggy address is located 8 bytes inside of [ 15.306375] freed 16-byte region [fff00000c6086760, fff00000c6086770) [ 15.306447] [ 15.306476] The buggy address belongs to the physical page: [ 15.306509] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106086 [ 15.306561] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.306609] page_type: f5(slab) [ 15.306649] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.306707] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.306748] page dumped because: kasan: bad access detected [ 15.306780] [ 15.306804] Memory state around the buggy address: [ 15.306836] fff00000c6086600: 00 05 fc fc 00 00 fc fc 00 06 fc fc 00 06 fc fc [ 15.306889] fff00000c6086680: 00 00 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.306954] >fff00000c6086700: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.306993] ^ [ 15.307044] fff00000c6086780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.307101] fff00000c6086800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.307139] ==================================================================
[ 13.191668] ================================================================== [ 13.192279] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380 [ 13.192834] Read of size 1 at addr ffff888101c73588 by task kunit_try_catch/202 [ 13.193228] [ 13.193553] CPU: 0 UID: 0 PID: 202 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 13.193614] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.193626] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.193648] Call Trace: [ 13.193660] <TASK> [ 13.193676] dump_stack_lvl+0x73/0xb0 [ 13.193740] print_report+0xd1/0x610 [ 13.193764] ? __virt_addr_valid+0x1db/0x2d0 [ 13.193789] ? kmalloc_uaf+0x320/0x380 [ 13.193820] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.193842] ? kmalloc_uaf+0x320/0x380 [ 13.193862] kasan_report+0x141/0x180 [ 13.193884] ? kmalloc_uaf+0x320/0x380 [ 13.193936] __asan_report_load1_noabort+0x18/0x20 [ 13.193960] kmalloc_uaf+0x320/0x380 [ 13.193980] ? __pfx_kmalloc_uaf+0x10/0x10 [ 13.194011] ? __schedule+0x10c6/0x2b60 [ 13.194034] ? __pfx_read_tsc+0x10/0x10 [ 13.194177] ? ktime_get_ts64+0x86/0x230 [ 13.194204] kunit_try_run_case+0x1a5/0x480 [ 13.194230] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.194253] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.194277] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.194300] ? __kthread_parkme+0x82/0x180 [ 13.194322] ? preempt_count_sub+0x50/0x80 [ 13.194346] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.194369] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.194392] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.194415] kthread+0x337/0x6f0 [ 13.194434] ? trace_preempt_on+0x20/0xc0 [ 13.194458] ? __pfx_kthread+0x10/0x10 [ 13.194490] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.194512] ? calculate_sigpending+0x7b/0xa0 [ 13.194535] ? __pfx_kthread+0x10/0x10 [ 13.194556] ret_from_fork+0x116/0x1d0 [ 13.194575] ? __pfx_kthread+0x10/0x10 [ 13.194595] ret_from_fork_asm+0x1a/0x30 [ 13.194625] </TASK> [ 13.194636] [ 13.203354] Allocated by task 202: [ 13.203545] kasan_save_stack+0x45/0x70 [ 13.203693] kasan_save_track+0x18/0x40 [ 13.203830] kasan_save_alloc_info+0x3b/0x50 [ 13.204016] __kasan_kmalloc+0xb7/0xc0 [ 13.204257] __kmalloc_cache_noprof+0x189/0x420 [ 13.204693] kmalloc_uaf+0xaa/0x380 [ 13.204924] kunit_try_run_case+0x1a5/0x480 [ 13.205238] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.205449] kthread+0x337/0x6f0 [ 13.205637] ret_from_fork+0x116/0x1d0 [ 13.205952] ret_from_fork_asm+0x1a/0x30 [ 13.206240] [ 13.206338] Freed by task 202: [ 13.206532] kasan_save_stack+0x45/0x70 [ 13.206720] kasan_save_track+0x18/0x40 [ 13.206964] kasan_save_free_info+0x3f/0x60 [ 13.207464] __kasan_slab_free+0x56/0x70 [ 13.207689] kfree+0x222/0x3f0 [ 13.207809] kmalloc_uaf+0x12c/0x380 [ 13.207940] kunit_try_run_case+0x1a5/0x480 [ 13.208087] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.208310] kthread+0x337/0x6f0 [ 13.208728] ret_from_fork+0x116/0x1d0 [ 13.209014] ret_from_fork_asm+0x1a/0x30 [ 13.209310] [ 13.209420] The buggy address belongs to the object at ffff888101c73580 [ 13.209420] which belongs to the cache kmalloc-16 of size 16 [ 13.210207] The buggy address is located 8 bytes inside of [ 13.210207] freed 16-byte region [ffff888101c73580, ffff888101c73590) [ 13.210606] [ 13.210682] The buggy address belongs to the physical page: [ 13.211017] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101c73 [ 13.211557] flags: 0x200000000000000(node=0|zone=2) [ 13.211813] page_type: f5(slab) [ 13.212026] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 13.212289] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 13.212601] page dumped because: kasan: bad access detected [ 13.213243] [ 13.213357] Memory state around the buggy address: [ 13.213651] ffff888101c73480: fa fb fc fc fa fb fc fc fa fb fc fc 00 05 fc fc [ 13.214183] ffff888101c73500: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 13.214550] >ffff888101c73580: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.214892] ^ [ 13.215102] ffff888101c73600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.215327] ffff888101c73680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.215658] ==================================================================