================================================================== BUG: KFENCE: use-after-free read in rxrpc_local_cmp_key net/rxrpc/local_object.c:53 [inline] BUG: KFENCE: use-after-free read in rxrpc_lookup_local+0x203/0xfb0 net/rxrpc/local_object.c:224 Use-after-free read at 0xffff88823bda2e1c (in kfence-#208): rxrpc_local_cmp_key net/rxrpc/local_object.c:53 [inline] rxrpc_lookup_local+0x203/0xfb0 net/rxrpc/local_object.c:224 rxrpc_sendmsg+0x4bc/0x650 net/rxrpc/af_rxrpc.c:543 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 sock_write_iter+0x295/0x3d0 net/socket.c:1108 call_write_iter include/linux/fs.h:2186 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9ed/0xdd0 fs/read_write.c:584 ksys_write+0x1ec/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd kfence-#208: 0xffff88823bda2c00-0xffff88823bda2e3f, size=576, cache=kmalloc-1k allocated by task 22546 on cpu 0 at 1140.109888s: kfence_alloc include/linux/kfence.h:128 [inline] slab_alloc_node mm/slub.c:3438 [inline] __kmem_cache_alloc_node+0x29c/0x430 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] rxrpc_alloc_local net/rxrpc/local_object.c:93 [inline] rxrpc_lookup_local+0x4d9/0xfb0 net/rxrpc/local_object.c:249 rxrpc_sendmsg+0x4bc/0x650 net/rxrpc/af_rxrpc.c:543 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 sock_write_iter+0x295/0x3d0 net/socket.c:1108 call_write_iter include/linux/fs.h:2186 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9ed/0xdd0 fs/read_write.c:584 ksys_write+0x1ec/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd freed by task 15 on cpu 0 at 1140.169370s: rcu_do_batch kernel/rcu/tree.c:2244 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2504 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:934 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:926 smpboot_thread_fn+0x659/0xa20 kernel/smpboot.c:164 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 CPU: 0 PID: 22559 Comm: syz-executor.1 Not tainted 6.1.0-syzkaller-09640-g7ae9888d6e1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:rxrpc_local_cmp_key net/rxrpc/local_object.c:53 [inline] RIP: 0010:rxrpc_lookup_local+0x203/0xfb0 net/rxrpc/local_object.c:224 Code: fc 01 00 00 48 89 f8 48 c1 e8 03 42 0f b6 14 28 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 cc 0b 00 00 48 8b 44 24 08 <41> 0f b7 9c 24 fc 01 00 00 0f b6 00 38 44 24 30 7c 08 84 c0 0f 85 RSP: 0018:ffffc90005b4fb60 EFLAGS: 00010246 RAX: ffffed1009bee29a RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88ed2af5 RDI: ffff88823bda2e1c RBP: ffff88804df714d0 R08: 0000000000000000 R09: ffffffff8e73cb57 R10: fffffbfff1ce796a R11: 0000000000000000 R12: ffff88823bda2c20 R13: dffffc0000000000 R14: ffff88804dc8c000 R15: ffff888042839818 FS: 00007f66ea3fe700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823bda2e1c CR3: 000000005ed8b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rxrpc_sendmsg+0x4bc/0x650 net/rxrpc/af_rxrpc.c:543 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 sock_write_iter+0x295/0x3d0 net/socket.c:1108 call_write_iter include/linux/fs.h:2186 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9ed/0xdd0 fs/read_write.c:584 ksys_write+0x1ec/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f66eb88c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f66ea3fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f66eb9abf80 RCX: 00007f66eb88c0d9 RDX: 000000000000003c RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00007f66eb8e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe00d62c8f R14: 00007f66ea3fe300 R15: 0000000000022000 ================================================================== ---------------- Code disassembly (best guess): 0: fc cld 1: 01 00 add %eax,(%rax) 3: 00 48 89 add %cl,-0x77(%rax) 6: f8 clc 7: 48 c1 e8 03 shr $0x3,%rax b: 42 0f b6 14 28 movzbl (%rax,%r13,1),%edx 10: 48 89 f8 mov %rdi,%rax 13: 83 e0 07 and $0x7,%eax 16: 83 c0 01 add $0x1,%eax 19: 38 d0 cmp %dl,%al 1b: 7c 08 jl 0x25 1d: 84 d2 test %dl,%dl 1f: 0f 85 cc 0b 00 00 jne 0xbf1 25: 48 8b 44 24 08 mov 0x8(%rsp),%rax * 2a: 41 0f b7 9c 24 fc 01 movzwl 0x1fc(%r12),%ebx <-- trapping instruction 31: 00 00 33: 0f b6 00 movzbl (%rax),%eax 36: 38 44 24 30 cmp %al,0x30(%rsp) 3a: 7c 08 jl 0x44 3c: 84 c0 test %al,%al 3e: 0f .byte 0xf 3f: 85 .byte 0x85