8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85083003, *pmd=ed0e1003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 7673 Comm: syz-executor.0 Not tainted 6.10.0-rc2-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 : [<80481540>] lr : [<80806998>] psr: 60000013 sp : dfdedca0 ip : dfdedcb0 fp : dfdedcac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f11400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84fe4f80 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 84f11400 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 0xdfdec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfdec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.0 (pid: 7673, stack limit = 0xdfdec000) Stack: (0xdfdedca0 to 0xdfdee000) dca0: dfdedce4 dfdedcb0 80806998 80481540 dfdedcd4 dfdedf48 8024d2c4 84f11400 dcc0: 84f11400 00000000 00000001 00000000 000000c7 00000018 dfdedd34 dfdedce8 dce0: 8146162c 808068ac 00000000 4b5315af 84509200 845092e0 844bcc00 845092e8 dd00: dfdedf48 00000002 dfdedd8c 844bcc00 000000c7 84509200 83e61800 00000000 dd20: 00000102 00000000 dfdedda4 dfdedd38 81688d74 81461548 00000102 00000000 dd40: 00000000 00000000 00000000 00000000 844bcc88 845092fc 844bce34 dfdedf38 dd60: 00000000 4b5315af 8260ca7c 821cb998 00000102 4b5315af dfdedf38 81688c24 dd80: dfdedf38 8334e780 00000102 00000000 00000102 dfdeddf4 dfdeddc4 dfdedda8 dda0: 81687abc 81688c30 00000000 00000102 00000000 81687a84 dfdedde4 dfdeddc8 ddc0: 813d0894 81687a90 dfdedf38 200004c0 8334e780 00000000 dfdedea4 dfdedde8 dde0: 813d0a98 813d0850 00000001 00000000 dfdede34 00000000 00000000 00000000 de00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de60: 00000000 00000000 00000000 00000000 00000000 4b5315af 00000000 00000000 de80: dfdedf38 200004c0 00000102 8334e780 83e61800 00000129 dfdedf24 dfdedea8 dea0: 813d3b7c 813d0a14 00000102 00000000 80287344 00000000 00000000 200002c0 dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 4b5315af df00: dfdedf24 8334e780 00000000 200004c0 00000102 8020029c dfdedfa4 dfdedf28 df20: 813d435c 813d3b00 00000000 dfdedf38 00000001 fffffff7 dfdeddf4 00000000 df40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020c910 4b5315af 00000000 00000000 001542d0 00000129 00000000 dfdedfa8 dfa0: 80200060 813d42f4 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 001542d0 00000129 7e8ae32e 7e8ae32f 003d0f00 76b7b0fc dfe0: 76b7af08 76b7aef8 00016ea8 00051620 60000010 00000003 00000000 00000000 Call trace: [<80481534>] (__kmap_local_page_prot) from [<80806998>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80481534>] (__kmap_local_page_prot) from [<80806998>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<808068a0>] (copy_page_to_iter) from [<8146162c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:84f11400 r4:84f11400 [<8146153c>] (sk_msg_recvmsg) from [<81688d74>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8146153c>] (sk_msg_recvmsg) from [<81688d74>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:83e61800 r6:84509200 r5:000000c7 r4:844bcc00 [<81688c24>] (unix_bpf_recvmsg) from [<81687abc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2489) r10:dfdeddf4 r9:00000102 r8:00000000 r7:00000102 r6:8334e780 r5:dfdedf38 r4:81688c24 [<81687a84>] (unix_dgram_recvmsg) from [<813d0894>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81687a84>] (unix_dgram_recvmsg) from [<813d0894>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81687a84 [<813d0844>] (sock_recvmsg) from [<813d0a98>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:8334e780 r5:200004c0 r4:dfdedf38 [<813d0a08>] (____sys_recvmsg) from [<813d3b7c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:83e61800 r8:8334e780 r7:00000102 r6:200004c0 r5:dfdedf38 r4:00000000 [<813d3af4>] (___sys_recvmsg) from [<813d435c>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d3af4>] (___sys_recvmsg) from [<813d435c>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d3af4>] (___sys_recvmsg) from [<813d435c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:8334e780 [<813d42e8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdedfa8 to 0xdfdedff0) dfa0: 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 001542d0 00000129 7e8ae32e 7e8ae32f 003d0f00 76b7b0fc dfe0: 76b7af08 76b7aef8 00016ea8 00051620 r7:00000129 r6:001542d0 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