================================================================== BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183 Read of size 2 at addr ffff8880496d482a by task syz.1.9582/443 CPU: 1 UID: 0 PID: 443 Comm: syz.1.9582 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:memset_orig+0x36/0xb0 arch/x86/lib/memset_64.S:70 Code: 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 <48> 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 RSP: 0018:ffffc90019bd7870 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff888030c59400 RCX: 0000000000000002 RDX: 0000000000000200 RSI: 0000000000000000 RDI: ffff888030c59540 RBP: 0000000000002dc0 R08: 0000000000000001 R09: 0000000000000000 R10: ffff888030c59400 R11: ffffed100f14d515 R12: 0000000000000200 R13: ffff888030c59400 R14: 0000000000102a00 R15: ffff88801a441c80 slab_post_alloc_hook mm/slub.c:4183 [inline] slab_alloc_node mm/slub.c:4229 [inline] __kmalloc_cache_noprof+0x1e2/0x3d0 mm/slub.c:4391 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] genradix_alloc_node include/linux/generic-radix-tree.h:101 [inline] __genradix_ptr_alloc+0x352/0x4a0 lib/generic-radix-tree.c:69 __genradix_prealloc+0x44/0x90 lib/generic-radix-tree.c:216 sctp_stream_alloc_out net/sctp/stream.c:104 [inline] sctp_stream_init+0x14b/0x440 net/sctp/stream.c:149 sctp_association_init net/sctp/associola.c:232 [inline] sctp_association_new+0x10dd/0x25f0 net/sctp/associola.c:296 sctp_connect_new_asoc+0x2c5/0x690 net/sctp/socket.c:1091 __sctp_connect+0x5ba/0xd50 net/sctp/socket.c:1197 __sctp_setsockopt_connectx net/sctp/socket.c:1336 [inline] sctp_getsockopt_connectx3+0x2c4/0x440 net/sctp/socket.c:1421 sctp_getsockopt+0x98a/0xb60 net/sctp/socket.c:8121 do_sock_getsockopt+0x372/0x450 net/socket.c:2405 __sys_getsockopt net/socket.c:2434 [inline] __do_sys_getsockopt net/socket.c:2441 [inline] __se_sys_getsockopt net/socket.c:2438 [inline] __x64_sys_getsockopt+0x1a5/0x250 net/socket.c:2438 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2fc498ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2fc57b2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007f2fc4bb6090 RCX: 00007f2fc498ebe9 RDX: 000000000000006f RSI: 0000000000000084 RDI: 000000000000000a RBP: 00007f2fc4a11e19 R08: 0000200000000140 R09: 0000000000000000 R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2fc4bb6128 R14: 00007f2fc4bb6090 R15: 00007ffc34449d28 Allocated by task 32477: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4396 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] alloc_bprm+0x7d/0x5c0 fs/exec.c:1414 kernel_execve+0x9b/0x9f0 fs/exec.c:1885 call_usermodehelper_exec_async+0x210/0x360 kernel/umh.c:109 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 32477: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kfree+0x18e/0x440 mm/slub.c:4879 kernel_execve+0x3c7/0x9f0 fs/exec.c:1922 call_usermodehelper_exec_async+0x210/0x360 kernel/umh.c:109 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff8880496d4800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 42 bytes inside of freed 512-byte region [ffff8880496d4800, ffff8880496d4a00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880496d5800 pfn:0x496d4 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801a441c80 ffffea0000cab410 ffffea00016bcd10 raw: ffff8880496d5800 0000000000100003 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801a441c80 ffffea0000cab410 ffffea00016bcd10 head: ffff8880496d5800 0000000000100003 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea000125b501 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 22726, tgid 22724 (syz.0.6922), ts 386966589106, free_ts 382084155073 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_node_track_caller_noprof+0x2f8/0x4e0 mm/slub.c:4384 kmemdup_noprof+0x2b/0x70 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:765 [inline] cache_create_net+0x2f/0x260 net/sunrpc/cache.c:1743 rsi_cache_create_net net/sunrpc/auth_gss/svcauth_gss.c:2024 [inline] gss_svc_init_net+0x104/0x570 net/sunrpc/auth_gss/svcauth_gss.c:2084 ops_init+0x359/0x5c0 net/core/net_namespace.c:136 setup_net+0x10c/0x320 net/core/net_namespace.c:438 copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3127 page last free pid 22496 tgid 22496 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 __slab_free+0x303/0x3c0 mm/slub.c:4591 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236 new_handle fs/jbd2/transaction.c:457 [inline] jbd2__journal_start+0x146/0x5b0 fs/jbd2/transaction.c:484 __ext4_journal_start_sb+0x227/0x5c0 fs/ext4/ext4_jbd2.c:115 __ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline] ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6535 __mark_inode_dirty+0x2e9/0xe10 fs/fs-writeback.c:2527 generic_update_time fs/inode.c:2063 [inline] inode_update_time fs/inode.c:2076 [inline] __file_update_time fs/inode.c:2304 [inline] file_update_time+0x40c/0x490 fs/inode.c:2334 ext4_page_mkwrite+0x20e/0x1190 fs/ext4/inode.c:6704 do_page_mkwrite+0x14d/0x310 mm/memory.c:3361 do_shared_fault mm/memory.c:5649 [inline] do_fault mm/memory.c:5711 [inline] do_pte_missing mm/memory.c:4234 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x1916/0x5440 mm/memory.c:6195 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336 Memory state around the buggy address: ffff8880496d4700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880496d4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880496d4800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880496d4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880496d4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 01 01 add %eax,(%rcx) 2: 01 01 add %eax,(%rcx) 4: 01 48 0f add %ecx,0xf(%rax) 7: af scas %es:(%rdi),%eax 8: c1 41 89 f9 roll $0xf9,-0x77(%rcx) c: 41 83 e1 07 and $0x7,%r9d 10: 75 74 jne 0x86 12: 48 89 d1 mov %rdx,%rcx 15: 48 c1 e9 06 shr $0x6,%rcx 19: 74 39 je 0x54 1b: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 22: 00 00 24: 48 ff c9 dec %rcx 27: 48 89 07 mov %rax,(%rdi) * 2a: 48 89 47 08 mov %rax,0x8(%rdi) <-- trapping instruction 2e: 48 89 47 10 mov %rax,0x10(%rdi) 32: 48 89 47 18 mov %rax,0x18(%rdi) 36: 48 89 47 20 mov %rax,0x20(%rdi) 3a: 48 89 47 28 mov %rax,0x28(%rdi) 3e: 48 rex.W 3f: 89 .byte 0x89