Date
July 8, 2025, 4:38 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.019078] ================================================================== [ 18.019135] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 18.019194] Read of size 1 at addr fff00000c5cff700 by task kunit_try_catch/194 [ 18.019252] [ 18.019284] CPU: 1 UID: 0 PID: 194 Comm: kunit_try_catch Tainted: G B N 6.15.6-rc1 #1 PREEMPT [ 18.019498] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.019639] Hardware name: linux,dummy-virt (DT) [ 18.019677] Call trace: [ 18.019973] show_stack+0x20/0x38 (C) [ 18.020039] dump_stack_lvl+0x8c/0xd0 [ 18.020117] print_report+0x118/0x608 [ 18.020182] kasan_report+0xdc/0x128 [ 18.020252] __kasan_check_byte+0x54/0x70 [ 18.020360] kfree_sensitive+0x30/0xb0 [ 18.020411] kmalloc_double_kzfree+0x168/0x308 [ 18.020463] kunit_try_run_case+0x170/0x3f0 [ 18.020514] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.020568] kthread+0x328/0x630 [ 18.020612] ret_from_fork+0x10/0x20 [ 18.020754] [ 18.020775] Allocated by task 194: [ 18.020874] kasan_save_stack+0x3c/0x68 [ 18.020950] kasan_save_track+0x20/0x40 [ 18.021025] kasan_save_alloc_info+0x40/0x58 [ 18.021096] __kasan_kmalloc+0xd4/0xd8 [ 18.021153] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.021228] kmalloc_double_kzfree+0xb8/0x308 [ 18.021313] kunit_try_run_case+0x170/0x3f0 [ 18.021364] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.021545] kthread+0x328/0x630 [ 18.021729] ret_from_fork+0x10/0x20 [ 18.021792] [ 18.021870] Freed by task 194: [ 18.021919] kasan_save_stack+0x3c/0x68 [ 18.021995] kasan_save_track+0x20/0x40 [ 18.022114] kasan_save_free_info+0x4c/0x78 [ 18.022181] __kasan_slab_free+0x6c/0x98 [ 18.022220] kfree+0x214/0x3c8 [ 18.022390] kfree_sensitive+0x80/0xb0 [ 18.022439] kmalloc_double_kzfree+0x11c/0x308 [ 18.022481] kunit_try_run_case+0x170/0x3f0 [ 18.022537] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.022585] kthread+0x328/0x630 [ 18.022622] ret_from_fork+0x10/0x20 [ 18.022657] [ 18.022678] The buggy address belongs to the object at fff00000c5cff700 [ 18.022678] which belongs to the cache kmalloc-16 of size 16 [ 18.022735] The buggy address is located 0 bytes inside of [ 18.022735] freed 16-byte region [fff00000c5cff700, fff00000c5cff710) [ 18.022797] [ 18.022832] The buggy address belongs to the physical page: [ 18.022871] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105cff [ 18.022934] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.022983] page_type: f5(slab) [ 18.023024] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 18.023084] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 18.023123] page dumped because: kasan: bad access detected [ 18.023155] [ 18.023174] Memory state around the buggy address: [ 18.023214] fff00000c5cff600: 00 00 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 18.023268] fff00000c5cff680: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 18.023310] >fff00000c5cff700: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.023364] ^ [ 18.023406] fff00000c5cff780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.023456] fff00000c5cff800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.023494] ==================================================================
[ 11.635386] ================================================================== [ 11.636852] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 11.637751] Read of size 1 at addr ffff88810242c940 by task kunit_try_catch/212 [ 11.638250] [ 11.638344] CPU: 0 UID: 0 PID: 212 Comm: kunit_try_catch Tainted: G B N 6.15.6-rc1 #1 PREEMPT(voluntary) [ 11.638390] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.638402] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.638424] Call Trace: [ 11.638437] <TASK> [ 11.638452] dump_stack_lvl+0x73/0xb0 [ 11.638479] print_report+0xd1/0x650 [ 11.638503] ? __virt_addr_valid+0x1db/0x2d0 [ 11.638851] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.638890] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.638914] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.638935] kasan_report+0x141/0x180 [ 11.638958] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.638982] ? kmalloc_double_kzfree+0x19c/0x350 [ 11.639001] __kasan_check_byte+0x3d/0x50 [ 11.639024] kfree_sensitive+0x22/0x90 [ 11.639048] kmalloc_double_kzfree+0x19c/0x350 [ 11.639068] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 11.639089] ? __schedule+0x10cc/0x2b60 [ 11.639112] ? __pfx_read_tsc+0x10/0x10 [ 11.639133] ? ktime_get_ts64+0x86/0x230 [ 11.639159] kunit_try_run_case+0x1a5/0x480 [ 11.639181] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.639200] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.639224] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.639248] ? __kthread_parkme+0x82/0x180 [ 11.639271] ? preempt_count_sub+0x50/0x80 [ 11.639297] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.639317] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.639341] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.639364] kthread+0x337/0x6f0 [ 11.639381] ? trace_preempt_on+0x20/0xc0 [ 11.639405] ? __pfx_kthread+0x10/0x10 [ 11.639423] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.639447] ? calculate_sigpending+0x7b/0xa0 [ 11.639469] ? __pfx_kthread+0x10/0x10 [ 11.639488] ret_from_fork+0x41/0x80 [ 11.639519] ? __pfx_kthread+0x10/0x10 [ 11.639537] ret_from_fork_asm+0x1a/0x30 [ 11.639568] </TASK> [ 11.639586] [ 11.654137] Allocated by task 212: [ 11.654475] kasan_save_stack+0x45/0x70 [ 11.654757] kasan_save_track+0x18/0x40 [ 11.654978] kasan_save_alloc_info+0x3b/0x50 [ 11.655413] __kasan_kmalloc+0xb7/0xc0 [ 11.655776] __kmalloc_cache_noprof+0x189/0x420 [ 11.656183] kmalloc_double_kzfree+0xa9/0x350 [ 11.656338] kunit_try_run_case+0x1a5/0x480 [ 11.656484] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.656964] kthread+0x337/0x6f0 [ 11.657334] ret_from_fork+0x41/0x80 [ 11.657810] ret_from_fork_asm+0x1a/0x30 [ 11.658359] [ 11.658541] Freed by task 212: [ 11.658822] kasan_save_stack+0x45/0x70 [ 11.659193] kasan_save_track+0x18/0x40 [ 11.659338] kasan_save_free_info+0x3f/0x60 [ 11.659482] __kasan_slab_free+0x56/0x70 [ 11.659846] kfree+0x222/0x3f0 [ 11.660197] kfree_sensitive+0x67/0x90 [ 11.660559] kmalloc_double_kzfree+0x12b/0x350 [ 11.661047] kunit_try_run_case+0x1a5/0x480 [ 11.661433] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.661757] kthread+0x337/0x6f0 [ 11.661942] ret_from_fork+0x41/0x80 [ 11.662280] ret_from_fork_asm+0x1a/0x30 [ 11.662703] [ 11.662867] The buggy address belongs to the object at ffff88810242c940 [ 11.662867] which belongs to the cache kmalloc-16 of size 16 [ 11.663656] The buggy address is located 0 bytes inside of [ 11.663656] freed 16-byte region [ffff88810242c940, ffff88810242c950) [ 11.664153] [ 11.664317] The buggy address belongs to the physical page: [ 11.664806] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10242c [ 11.665629] flags: 0x200000000000000(node=0|zone=2) [ 11.666215] page_type: f5(slab) [ 11.666525] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 11.667087] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 11.667649] page dumped because: kasan: bad access detected [ 11.667824] [ 11.668157] Memory state around the buggy address: [ 11.668605] ffff88810242c800: 00 04 fc fc 00 00 fc fc 00 04 fc fc 00 04 fc fc [ 11.669332] ffff88810242c880: 00 00 fc fc 00 04 fc fc fa fb fc fc fa fb fc fc [ 11.669832] >ffff88810242c900: 00 05 fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 11.670361] ^ [ 11.670547] ffff88810242c980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.671240] ffff88810242ca00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.671935] ==================================================================