8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85056003, *pmd=fe5b9003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 3861 Comm: syz-executor.1 Not tainted 6.10.0-rc3-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1103 [inline] PC is at __kmap_local_page_prot+0xc/0x74 mm/highmem.c:573 LR is at kmap_local_page include/linux/highmem-internal.h:73 [inline] LR is at copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360 pc : [<80481680>] lr : [<80806eec>] psr: 60000013 sp : dfb99ca0 ip : dfb99cb0 fp : dfb99cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84e9b400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85042900 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: non-paged memory Register r3 information: non-paged memory Register r4 information: slab kmalloc-1k start 84e9b400 pointer offset 0 size 1024 Register r5 information: NULL pointer Register r6 information: NULL pointer Register r7 information: NULL pointer Register r8 information: NULL pointer Register r9 information: non-slab/vmalloc memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfb98000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfb98000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 3861, stack limit = 0xdfb98000) Stack: (0xdfb99ca0 to 0xdfb9a000) 9ca0: dfb99ce4 dfb99cb0 80806eec 80481680 dfb99cd4 dfb99f48 8024d2c4 84e9b400 9cc0: 84e9b400 00000000 00000001 00000000 000000c7 00000018 dfb99d34 dfb99ce8 9ce0: 81461cc0 80806e00 00000000 02083cad 84efc000 84efc0e0 840cea00 84efc0e8 9d00: dfb99f48 00000002 dfb99d8c 840cea00 000000c7 84efc000 8476c800 00000000 9d20: 00000102 00000000 dfb99da4 dfb99d38 81689544 81461bdc 00000102 00000000 9d40: 00000000 00000000 00000000 00000000 840cea88 84efc0fc 840cec34 dfb99f38 9d60: 00000000 02083cad 818f63f8 821cb998 00000102 02083cad dfb99f38 816893f4 9d80: dfb99f38 848c0c80 00000102 00000000 00000102 dfb99df4 dfb99dc4 dfb99da8 9da0: 8168828c 81689400 00000000 00000102 00000000 81688254 dfb99de4 dfb99dc8 9dc0: 813d0e74 81688260 dfb99f38 200004c0 848c0c80 00000000 dfb99ea4 dfb99de8 9de0: 813d1078 813d0e30 00000001 00000000 dfb99e34 00000000 00000000 00000000 9e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e60: 00000000 00000000 00000000 00000000 00000000 02083cad 00000000 00000000 9e80: dfb99f38 200004c0 00000102 848c0c80 8476c800 00000129 dfb99f24 dfb99ea8 9ea0: 813d415c 813d0ff4 00000102 00000000 80287344 00000000 00000000 200002c0 9ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 02083cad 9f00: dfb99f24 848c0c80 00000000 200004c0 00000102 8020029c dfb99fa4 dfb99f28 9f20: 813d493c 813d40e0 00000000 dfb99f38 00000001 fffffff7 dfb99df4 00000000 9f40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020c910 02083cad 00000000 00000000 001542c8 00000129 00000000 dfb99fa8 9fa0: 80200060 813d48d4 00000000 00000000 00000003 200004c0 00000102 00000000 9fc0: 00000000 00000000 001542c8 00000129 7eff8336 7eff8337 003d0f00 76b100fc 9fe0: 76b0ff08 76b0fef8 00016f30 00051660 60000010 00000003 00000000 00000000 Call trace: [<80481674>] (__kmap_local_page_prot) from [<80806eec>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80481674>] (__kmap_local_page_prot) from [<80806eec>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806df4>] (copy_page_to_iter) from [<81461cc0>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:84e9b400 r4:84e9b400 [<81461bd0>] (sk_msg_recvmsg) from [<81689544>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461bd0>] (sk_msg_recvmsg) from [<81689544>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:8476c800 r6:84efc000 r5:000000c7 r4:840cea00 [<816893f4>] (unix_bpf_recvmsg) from [<8168828c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:dfb99df4 r9:00000102 r8:00000000 r7:00000102 r6:848c0c80 r5:dfb99f38 r4:816893f4 [<81688254>] (unix_dgram_recvmsg) from [<813d0e74>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81688254>] (unix_dgram_recvmsg) from [<813d0e74>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81688254 [<813d0e24>] (sock_recvmsg) from [<813d1078>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:848c0c80 r5:200004c0 r4:dfb99f38 [<813d0fe8>] (____sys_recvmsg) from [<813d415c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:8476c800 r8:848c0c80 r7:00000102 r6:200004c0 r5:dfb99f38 r4:00000000 [<813d40d4>] (___sys_recvmsg) from [<813d493c>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d40d4>] (___sys_recvmsg) from [<813d493c>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d40d4>] (___sys_recvmsg) from [<813d493c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:848c0c80 [<813d48c8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb99fa8 to 0xdfb99ff0) 9fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 9fc0: 00000000 00000000 001542c8 00000129 7eff8336 7eff8337 003d0f00 76b100fc 9fe0: 76b0ff08 76b0fef8 00016f30 00051660 r7:00000129 r6:001542c8 r5:00000000 r4:00000000 Code: eaffffe8 e1a0c00d e92dd800 e24cb004 (e5901000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: eaffffe8 b 0xffffffa8 4: e1a0c00d mov ip, sp 8: e92dd800 push {fp, ip, lr, pc} c: e24cb004 sub fp, ip, #4 * 10: e5901000 ldr r1, [r0] <-- trapping instruction