8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=860c9003, *pmd=fe22b003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 4956 Comm: syz-executor.1 Not tainted 6.9.0-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 : [<804832e0>] lr : [<808097d4>] psr: 60000013 sp : dfd45ca0 ip : dfd45cb0 fp : dfd45cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f12c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 860c5c80 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 84f12c00 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 0xdfd44000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfd44000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 4956, stack limit = 0xdfd44000) Stack: (0xdfd45ca0 to 0xdfd46000) 5ca0: dfd45ce4 dfd45cb0 808097d4 804832e0 dfd45cd4 dfd45f48 8024d45c 84f12c00 5cc0: 84f12c00 00000000 00000000 00000000 000000b3 00000018 dfd45d34 dfd45ce8 5ce0: 8146b8d4 808096e8 40000013 848b31c0 8479e200 8479e2e0 8340c300 8479e2e8 5d00: dfd45f48 00000000 dfd45d34 8340c300 000000b3 8479e200 847e3c00 00000001 5d20: 00000000 00000000 dfd45da4 dfd45d38 81692ef4 8146b7f0 00000000 00000000 5d40: 00000000 8479e2e0 8479e2d0 7fffffff 8340c388 8479e2fc 8340c534 dfd45f38 5d60: 00000000 847e3c00 802a5054 00000100 00000122 70398d29 dfd45f38 81692da4 5d80: dfd45f38 848b3180 00000000 00000000 00000000 dfd45df4 dfd45dc4 dfd45da8 5da0: 81691c88 81692db0 00000000 00000000 00000000 81691c50 dfd45de4 dfd45dc8 5dc0: 813d9658 81691c5c dfd45f38 200004c0 848b3180 00000000 dfd45ea4 dfd45de8 5de0: 813d985c 813d9614 00000001 00000000 dfd45e34 00000000 00000000 00000000 5e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e60: 00000000 00000000 00000000 00000000 00000000 70398d29 00000000 00000000 5e80: dfd45f38 200004c0 00000000 848b3180 847e3c00 00000129 dfd45f24 dfd45ea8 5ea0: 813dc940 813d97d8 00000000 00000000 80287b04 00000000 00000000 200006c0 5ec0: 000000b3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 70398d29 5f00: dfd45f24 848b3180 00000000 200004c0 00000000 8020029c dfd45fa4 dfd45f28 5f20: 813dd120 813dc8c4 00000000 dfd45f38 00000001 fffffff7 dfd45df4 00000000 5f40: 00000000 00000000 00000000 00000000 200006c0 000000b3 00000001 00000000 5f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 5f80: 8020c940 70398d29 00000000 00000000 0014c2c8 00000129 00000000 dfd45fa8 5fa0: 80200060 813dd0b8 00000000 00000000 00000003 200004c0 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7e80932e 7e80932f 003d0f00 76b6c0fc 5fe0: 76b6bf08 76b6bef8 00016d28 00051560 60000010 00000003 00000000 00000000 Call trace: [<804832d4>] (__kmap_local_page_prot) from [<808097d4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<804832d4>] (__kmap_local_page_prot) from [<808097d4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<808096dc>] (copy_page_to_iter) from [<8146b8d4>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000b3 r8:00000000 r7:00000000 r6:00000000 r5:84f12c00 r4:84f12c00 [<8146b7e4>] (sk_msg_recvmsg) from [<81692ef4>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8146b7e4>] (sk_msg_recvmsg) from [<81692ef4>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:847e3c00 r6:8479e200 r5:000000b3 r4:8340c300 [<81692da4>] (unix_bpf_recvmsg) from [<81691c88>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2482) r10:dfd45df4 r9:00000000 r8:00000000 r7:00000000 r6:848b3180 r5:dfd45f38 r4:81692da4 [<81691c50>] (unix_dgram_recvmsg) from [<813d9658>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81691c50>] (unix_dgram_recvmsg) from [<813d9658>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81691c50 [<813d9608>] (sock_recvmsg) from [<813d985c>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:848b3180 r5:200004c0 r4:dfd45f38 [<813d97cc>] (____sys_recvmsg) from [<813dc940>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:847e3c00 r8:848b3180 r7:00000000 r6:200004c0 r5:dfd45f38 r4:00000000 [<813dc8b8>] (___sys_recvmsg) from [<813dd120>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813dc8b8>] (___sys_recvmsg) from [<813dd120>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813dc8b8>] (___sys_recvmsg) from [<813dd120>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:848b3180 [<813dd0ac>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd45fa8 to 0xdfd45ff0) 5fa0: 00000000 00000000 00000003 200004c0 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7e80932e 7e80932f 003d0f00 76b6c0fc 5fe0: 76b6bf08 76b6bef8 00016d28 00051560 r7:00000129 r6:0014c2c8 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