8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85342003, *pmd=fe711003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 4083 Comm: syz-executor.0 Not tainted 6.10.0-rc4-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 : [<80480f60>] lr : [<8080692c>] psr: 60000013 sp : dfea1ca0 ip : dfea1cb0 fp : dfea1cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8521d000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8407cc40 DAC: 00000000 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 8521d000 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 0xdfea0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfea0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.0 (pid: 4083, stack limit = 0xdfea0000) Stack: (0xdfea1ca0 to 0xdfea2000) 1ca0: dfea1ce4 dfea1cb0 8080692c 80480f60 dfea1cd4 dfea1f48 8024d2c4 8521d000 1cc0: 8521d000 00000000 00000000 00000000 000000b3 00000018 dfea1d34 dfea1ce8 1ce0: 81461a20 80806840 40000013 844927c0 84a35400 84a354e0 836f8c00 84a354e8 1d00: dfea1f48 00000000 dfea1d34 836f8c00 000000b3 84a35400 83ed8000 00000001 1d20: 00000000 00000000 dfea1da4 dfea1d38 816892a4 8146193c 00000000 00000000 1d40: 00000000 84a354e0 84a354d0 7fffffff 836f8c88 84a354fc 836f8e34 dfea1f38 1d60: 00000000 83ed8000 802a4894 00000100 00000122 8e574cdc dfea1f38 81689154 1d80: dfea1f38 84492780 00000000 00000000 00000000 dfea1df4 dfea1dc4 dfea1da8 1da0: 81687fec 81689160 00000000 00000000 00000000 81687fb4 dfea1de4 dfea1dc8 1dc0: 813d0bd4 81687fc0 dfea1f38 200004c0 84492780 00000000 dfea1ea4 dfea1de8 1de0: 813d0dd8 813d0b90 00000001 00000000 dfea1e34 00000000 00000000 00000000 1e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e60: 00000000 00000000 00000000 00000000 00000000 8e574cdc 00000000 00000000 1e80: dfea1f38 200004c0 00000000 84492780 83ed8000 00000129 dfea1f24 dfea1ea8 1ea0: 813d3ebc 813d0d54 00000000 00000000 80287344 00000000 00000000 200006c0 1ec0: 000000b3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8e574cdc 1f00: dfea1f24 84492780 00000000 200004c0 00000000 8020029c dfea1fa4 dfea1f28 1f20: 813d469c 813d3e40 00000000 dfea1f38 00000001 fffffff7 dfea1df4 00000000 1f40: 00000000 00000000 00000000 00000000 200006c0 000000b3 00000001 00000000 1f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 1f80: 8020c910 8e574cdc 00000000 00000000 001542c8 00000129 00000000 dfea1fa8 1fa0: 80200060 813d4634 00000000 00000000 00000008 200004c0 00000000 00000000 1fc0: 00000000 00000000 001542c8 00000129 7eae1336 7eae1337 003d0f00 76bff0fc 1fe0: 76bfef08 76bfeef8 00016f30 000516d0 60000010 00000008 00000000 00000000 Call trace: [<80480f54>] (__kmap_local_page_prot) from [<8080692c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80480f54>] (__kmap_local_page_prot) from [<8080692c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806834>] (copy_page_to_iter) from [<81461a20>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000b3 r8:00000000 r7:00000000 r6:00000000 r5:8521d000 r4:8521d000 [<81461930>] (sk_msg_recvmsg) from [<816892a4>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461930>] (sk_msg_recvmsg) from [<816892a4>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:83ed8000 r6:84a35400 r5:000000b3 r4:836f8c00 [<81689154>] (unix_bpf_recvmsg) from [<81687fec>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:dfea1df4 r9:00000000 r8:00000000 r7:00000000 r6:84492780 r5:dfea1f38 r4:81689154 [<81687fb4>] (unix_dgram_recvmsg) from [<813d0bd4>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81687fb4>] (unix_dgram_recvmsg) from [<813d0bd4>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81687fb4 [<813d0b84>] (sock_recvmsg) from [<813d0dd8>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:84492780 r5:200004c0 r4:dfea1f38 [<813d0d48>] (____sys_recvmsg) from [<813d3ebc>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:83ed8000 r8:84492780 r7:00000000 r6:200004c0 r5:dfea1f38 r4:00000000 [<813d3e34>] (___sys_recvmsg) from [<813d469c>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d3e34>] (___sys_recvmsg) from [<813d469c>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d3e34>] (___sys_recvmsg) from [<813d469c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:84492780 [<813d4628>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfea1fa8 to 0xdfea1ff0) 1fa0: 00000000 00000000 00000008 200004c0 00000000 00000000 1fc0: 00000000 00000000 001542c8 00000129 7eae1336 7eae1337 003d0f00 76bff0fc 1fe0: 76bfef08 76bfeef8 00016f30 000516d0 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