Date
May 15, 2025, 10:38 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.193787] ================================================================== [ 18.193851] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 18.194124] Read of size 1 at addr fff00000c6879fa8 by task kunit_try_catch/188 [ 18.194516] [ 18.194748] CPU: 1 UID: 0 PID: 188 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc6-next-20250515 #1 PREEMPT [ 18.195327] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.195409] Hardware name: linux,dummy-virt (DT) [ 18.195525] Call trace: [ 18.195584] show_stack+0x20/0x38 (C) [ 18.195771] dump_stack_lvl+0x8c/0xd0 [ 18.195876] print_report+0x118/0x608 [ 18.196243] kasan_report+0xdc/0x128 [ 18.196367] __asan_report_load1_noabort+0x20/0x30 [ 18.196447] kmalloc_uaf2+0x3f4/0x468 [ 18.196635] kunit_try_run_case+0x170/0x3f0 [ 18.196913] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.196979] kthread+0x328/0x630 [ 18.197048] ret_from_fork+0x10/0x20 [ 18.197099] [ 18.197119] Allocated by task 188: [ 18.197147] kasan_save_stack+0x3c/0x68 [ 18.197201] kasan_save_track+0x20/0x40 [ 18.197237] kasan_save_alloc_info+0x40/0x58 [ 18.197276] __kasan_kmalloc+0xd4/0xd8 [ 18.197312] __kmalloc_cache_noprof+0x15c/0x3c0 [ 18.197349] kmalloc_uaf2+0xc4/0x468 [ 18.197382] kunit_try_run_case+0x170/0x3f0 [ 18.197419] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.197460] kthread+0x328/0x630 [ 18.197494] ret_from_fork+0x10/0x20 [ 18.197554] [ 18.197571] Freed by task 188: [ 18.197596] kasan_save_stack+0x3c/0x68 [ 18.197640] kasan_save_track+0x20/0x40 [ 18.197683] kasan_save_free_info+0x4c/0x78 [ 18.197982] __kasan_slab_free+0x6c/0x98 [ 18.198374] kfree+0x214/0x3c8 [ 18.198549] kmalloc_uaf2+0x134/0x468 [ 18.198713] kunit_try_run_case+0x170/0x3f0 [ 18.198940] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.199055] kthread+0x328/0x630 [ 18.199210] ret_from_fork+0x10/0x20 [ 18.199268] [ 18.199466] The buggy address belongs to the object at fff00000c6879f80 [ 18.199466] which belongs to the cache kmalloc-64 of size 64 [ 18.199642] The buggy address is located 40 bytes inside of [ 18.199642] freed 64-byte region [fff00000c6879f80, fff00000c6879fc0) [ 18.199804] [ 18.199905] The buggy address belongs to the physical page: [ 18.200014] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106879 [ 18.200397] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.200595] page_type: f5(slab) [ 18.200663] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 18.200815] raw: 0000000000000000 0000000000200020 00000000f5000000 0000000000000000 [ 18.200883] page dumped because: kasan: bad access detected [ 18.200964] [ 18.201032] Memory state around the buggy address: [ 18.201095] fff00000c6879e80: 00 00 00 00 02 fc fc fc fc fc fc fc fc fc fc fc [ 18.201321] fff00000c6879f00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 18.201804] >fff00000c6879f80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 18.202124] ^ [ 18.202200] fff00000c687a000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 18.202306] fff00000c687a080: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 18.202463] ==================================================================
[ 14.410184] ================================================================== [ 14.411237] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 14.411574] Read of size 1 at addr ffff888102b50fa8 by task kunit_try_catch/206 [ 14.411946] [ 14.412139] CPU: 0 UID: 0 PID: 206 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc6-next-20250515 #1 PREEMPT(voluntary) [ 14.412240] Tainted: [B]=BAD_PAGE, [N]=TEST [ 14.412266] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 14.412308] Call Trace: [ 14.412332] <TASK> [ 14.412365] dump_stack_lvl+0x73/0xb0 [ 14.412423] print_report+0xd1/0x650 [ 14.412461] ? __virt_addr_valid+0x1db/0x2d0 [ 14.412505] ? kmalloc_uaf2+0x4a8/0x520 [ 14.412543] ? kasan_complete_mode_report_info+0x64/0x200 [ 14.412583] ? kmalloc_uaf2+0x4a8/0x520 [ 14.412624] kasan_report+0x141/0x180 [ 14.412663] ? kmalloc_uaf2+0x4a8/0x520 [ 14.412707] __asan_report_load1_noabort+0x18/0x20 [ 14.412744] kmalloc_uaf2+0x4a8/0x520 [ 14.412784] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 14.412822] ? finish_task_switch.isra.0+0x153/0x700 [ 14.412864] ? __switch_to+0x47/0xf50 [ 14.412910] ? __schedule+0x10cc/0x2b60 [ 14.412952] ? __pfx_read_tsc+0x10/0x10 [ 14.412994] ? ktime_get_ts64+0x86/0x230 [ 14.413043] kunit_try_run_case+0x1a5/0x480 [ 14.413093] ? __pfx_kunit_try_run_case+0x10/0x10 [ 14.413127] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 14.413161] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 14.413193] ? __kthread_parkme+0x82/0x180 [ 14.413236] ? preempt_count_sub+0x50/0x80 [ 14.413289] ? __pfx_kunit_try_run_case+0x10/0x10 [ 14.413316] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.413339] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 14.413360] kthread+0x337/0x6f0 [ 14.413380] ? trace_preempt_on+0x20/0xc0 [ 14.413404] ? __pfx_kthread+0x10/0x10 [ 14.413424] ? _raw_spin_unlock_irq+0x47/0x80 [ 14.413444] ? calculate_sigpending+0x7b/0xa0 [ 14.413480] ? __pfx_kthread+0x10/0x10 [ 14.413514] ret_from_fork+0x116/0x1d0 [ 14.413564] ? __pfx_kthread+0x10/0x10 [ 14.413586] ret_from_fork_asm+0x1a/0x30 [ 14.413618] </TASK> [ 14.413631] [ 14.422516] Allocated by task 206: [ 14.422923] kasan_save_stack+0x45/0x70 [ 14.423265] kasan_save_track+0x18/0x40 [ 14.423677] kasan_save_alloc_info+0x3b/0x50 [ 14.424022] __kasan_kmalloc+0xb7/0xc0 [ 14.424228] __kmalloc_cache_noprof+0x189/0x420 [ 14.424420] kmalloc_uaf2+0xc6/0x520 [ 14.424580] kunit_try_run_case+0x1a5/0x480 [ 14.424852] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.425246] kthread+0x337/0x6f0 [ 14.425995] ret_from_fork+0x116/0x1d0 [ 14.426354] ret_from_fork_asm+0x1a/0x30 [ 14.426815] [ 14.426982] Freed by task 206: [ 14.427133] kasan_save_stack+0x45/0x70 [ 14.427398] kasan_save_track+0x18/0x40 [ 14.427775] kasan_save_free_info+0x3f/0x60 [ 14.427951] __kasan_slab_free+0x56/0x70 [ 14.428256] kfree+0x222/0x3f0 [ 14.428497] kmalloc_uaf2+0x14c/0x520 [ 14.428708] kunit_try_run_case+0x1a5/0x480 [ 14.428959] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.429228] kthread+0x337/0x6f0 [ 14.429488] ret_from_fork+0x116/0x1d0 [ 14.429760] ret_from_fork_asm+0x1a/0x30 [ 14.429938] [ 14.430041] The buggy address belongs to the object at ffff888102b50f80 [ 14.430041] which belongs to the cache kmalloc-64 of size 64 [ 14.431138] The buggy address is located 40 bytes inside of [ 14.431138] freed 64-byte region [ffff888102b50f80, ffff888102b50fc0) [ 14.432039] [ 14.432156] The buggy address belongs to the physical page: [ 14.432407] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b50 [ 14.432672] flags: 0x200000000000000(node=0|zone=2) [ 14.433107] page_type: f5(slab) [ 14.433424] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 14.434059] raw: 0000000000000000 0000000000200020 00000000f5000000 0000000000000000 [ 14.434433] page dumped because: kasan: bad access detected [ 14.434634] [ 14.435237] Memory state around the buggy address: [ 14.435584] ffff888102b50e80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 14.436050] ffff888102b50f00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 14.436492] >ffff888102b50f80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 14.436742] ^ [ 14.437043] ffff888102b51000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 14.437478] ffff888102b51080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 14.438259] ==================================================================