Date
July 23, 2025, 3:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.158157] ================================================================== [ 31.158494] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x300/0x338 [ 31.158584] Read of size 1 at addr fff00000c8603ec8 by task kunit_try_catch/217 [ 31.158701] [ 31.158739] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250723 #1 PREEMPT [ 31.159122] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 31.159183] Hardware name: linux,dummy-virt (DT) [ 31.159226] Call trace: [ 31.159252] show_stack+0x20/0x38 (C) [ 31.159306] dump_stack_lvl+0x8c/0xd0 [ 31.159354] print_report+0x118/0x5e8 [ 31.159398] kasan_report+0xdc/0x128 [ 31.159736] __asan_report_load1_noabort+0x20/0x30 [ 31.159808] kmalloc_uaf+0x300/0x338 [ 31.159853] kunit_try_run_case+0x170/0x3f0 [ 31.160196] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.160386] kthread+0x328/0x630 [ 31.160439] ret_from_fork+0x10/0x20 [ 31.160508] [ 31.160614] Allocated by task 217: [ 31.160682] kasan_save_stack+0x3c/0x68 [ 31.160783] kasan_save_track+0x20/0x40 [ 31.160817] kasan_save_alloc_info+0x40/0x58 [ 31.160856] __kasan_kmalloc+0xd4/0xd8 [ 31.161062] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.161265] kmalloc_uaf+0xb8/0x338 [ 31.161359] kunit_try_run_case+0x170/0x3f0 [ 31.161399] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.161630] kthread+0x328/0x630 [ 31.161849] ret_from_fork+0x10/0x20 [ 31.161912] [ 31.161931] Freed by task 217: [ 31.162172] kasan_save_stack+0x3c/0x68 [ 31.162301] kasan_save_track+0x20/0x40 [ 31.162625] kasan_save_free_info+0x4c/0x78 [ 31.162699] __kasan_slab_free+0x6c/0x98 [ 31.162895] kfree+0x214/0x3c8 [ 31.162987] kmalloc_uaf+0x11c/0x338 [ 31.163193] kunit_try_run_case+0x170/0x3f0 [ 31.163534] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.163657] kthread+0x328/0x630 [ 31.163740] ret_from_fork+0x10/0x20 [ 31.163979] [ 31.164030] The buggy address belongs to the object at fff00000c8603ec0 [ 31.164030] which belongs to the cache kmalloc-16 of size 16 [ 31.164191] The buggy address is located 8 bytes inside of [ 31.164191] freed 16-byte region [fff00000c8603ec0, fff00000c8603ed0) [ 31.164293] [ 31.164339] The buggy address belongs to the physical page: [ 31.164395] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xfff00000c8603e00 pfn:0x108603 [ 31.164458] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.164516] page_type: f5(slab) [ 31.164953] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 31.165042] raw: fff00000c8603e00 000000008080007f 00000000f5000000 0000000000000000 [ 31.165107] page dumped because: kasan: bad access detected [ 31.165264] [ 31.165323] Memory state around the buggy address: [ 31.165481] fff00000c8603d80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.165598] fff00000c8603e00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.165707] >fff00000c8603e80: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 31.165835] ^ [ 31.165893] fff00000c8603f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.165949] fff00000c8603f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.166201] ==================================================================
[ 25.421703] ================================================================== [ 25.422236] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380 [ 25.422662] Read of size 1 at addr ffff888104963088 by task kunit_try_catch/233 [ 25.422971] [ 25.423258] CPU: 0 UID: 0 PID: 233 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250723 #1 PREEMPT(voluntary) [ 25.423315] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.423328] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.423351] Call Trace: [ 25.423364] <TASK> [ 25.423383] dump_stack_lvl+0x73/0xb0 [ 25.423415] print_report+0xd1/0x640 [ 25.423438] ? __virt_addr_valid+0x1db/0x2d0 [ 25.423463] ? kmalloc_uaf+0x320/0x380 [ 25.423483] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.423508] ? kmalloc_uaf+0x320/0x380 [ 25.423528] kasan_report+0x141/0x180 [ 25.423550] ? kmalloc_uaf+0x320/0x380 [ 25.423574] __asan_report_load1_noabort+0x18/0x20 [ 25.423652] kmalloc_uaf+0x320/0x380 [ 25.423675] ? __pfx_kmalloc_uaf+0x10/0x10 [ 25.423696] ? __schedule+0x10da/0x2b60 [ 25.423722] ? __pfx_read_tsc+0x10/0x10 [ 25.423744] ? ktime_get_ts64+0x86/0x230 [ 25.423769] kunit_try_run_case+0x1a5/0x480 [ 25.423795] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.423817] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.423842] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.423867] ? __kthread_parkme+0x82/0x180 [ 25.423888] ? preempt_count_sub+0x50/0x80 [ 25.423912] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.423936] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.424011] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.424034] kthread+0x337/0x6f0 [ 25.424055] ? trace_preempt_on+0x20/0xc0 [ 25.424092] ? __pfx_kthread+0x10/0x10 [ 25.424114] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.424138] ? calculate_sigpending+0x7b/0xa0 [ 25.424175] ? __pfx_kthread+0x10/0x10 [ 25.424197] ret_from_fork+0x116/0x1d0 [ 25.424217] ? __pfx_kthread+0x10/0x10 [ 25.424238] ret_from_fork_asm+0x1a/0x30 [ 25.424269] </TASK> [ 25.424280] [ 25.436637] Allocated by task 233: [ 25.437005] kasan_save_stack+0x45/0x70 [ 25.437463] kasan_save_track+0x18/0x40 [ 25.437964] kasan_save_alloc_info+0x3b/0x50 [ 25.438410] __kasan_kmalloc+0xb7/0xc0 [ 25.438624] __kmalloc_cache_noprof+0x189/0x420 [ 25.438779] kmalloc_uaf+0xaa/0x380 [ 25.438901] kunit_try_run_case+0x1a5/0x480 [ 25.439484] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.440175] kthread+0x337/0x6f0 [ 25.440529] ret_from_fork+0x116/0x1d0 [ 25.440931] ret_from_fork_asm+0x1a/0x30 [ 25.441417] [ 25.441586] Freed by task 233: [ 25.441897] kasan_save_stack+0x45/0x70 [ 25.442119] kasan_save_track+0x18/0x40 [ 25.442457] kasan_save_free_info+0x3f/0x60 [ 25.442950] __kasan_slab_free+0x56/0x70 [ 25.443261] kfree+0x222/0x3f0 [ 25.443574] kmalloc_uaf+0x12c/0x380 [ 25.443707] kunit_try_run_case+0x1a5/0x480 [ 25.444132] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.444806] kthread+0x337/0x6f0 [ 25.444987] ret_from_fork+0x116/0x1d0 [ 25.445425] ret_from_fork_asm+0x1a/0x30 [ 25.445794] [ 25.445863] The buggy address belongs to the object at ffff888104963080 [ 25.445863] which belongs to the cache kmalloc-16 of size 16 [ 25.446740] The buggy address is located 8 bytes inside of [ 25.446740] freed 16-byte region [ffff888104963080, ffff888104963090) [ 25.447970] [ 25.448141] The buggy address belongs to the physical page: [ 25.448457] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104963 [ 25.449227] flags: 0x200000000000000(node=0|zone=2) [ 25.449510] page_type: f5(slab) [ 25.449735] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 25.450464] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 25.450681] page dumped because: kasan: bad access detected [ 25.450845] [ 25.450910] Memory state around the buggy address: [ 25.451074] ffff888104962f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.451410] ffff888104963000: 00 04 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.451952] >ffff888104963080: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.452238] ^ [ 25.452418] ffff888104963100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.453243] ffff888104963180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.453687] ==================================================================