8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84ce0003, *pmd=fe7b1003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 8525 Comm: syz-executor.1 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 : [<80481638>] lr : [<80806f94>] psr: 60000013 sp : eae71ca0 ip : eae71cb0 fp : eae71cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84de5800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 843dcbc0 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 84de5800 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 0xeae70000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xeae70000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 8525, stack limit = 0xeae70000) Stack: (0xeae71ca0 to 0xeae72000) 1ca0: eae71ce4 eae71cb0 80806f94 80481638 eae71cd4 eae71f48 8024d2c4 84de5800 1cc0: 84de5800 00000000 00000001 00000000 000000c7 00000018 eae71d34 eae71ce8 1ce0: 81462088 80806ea8 00000000 b615fecd 84c5f800 84c5f8e0 86036d00 84c5f8e8 1d00: eae71f48 00000002 eae71d8c 86036d00 000000c7 84c5f800 8474d400 00000000 1d20: 00000102 00000000 eae71da4 eae71d38 8168990c 81461fa4 00000102 00000000 1d40: 00000000 00000000 00000000 00000000 86036d88 84c5f8fc 86036f34 eae71f38 1d60: 00000000 b615fecd 818f67d8 821cb998 00000102 b615fecd eae71f38 816897bc 1d80: eae71f38 8481cc80 00000102 00000000 00000102 eae71df4 eae71dc4 eae71da8 1da0: 81688654 816897c8 00000000 00000102 00000000 8168861c eae71de4 eae71dc8 1dc0: 813d123c 81688628 eae71f38 200004c0 8481cc80 00000000 eae71ea4 eae71de8 1de0: 813d1440 813d11f8 00000001 00000000 eae71e34 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 b615fecd 00000000 00000000 1e80: eae71f38 200004c0 00000102 8481cc80 8474d400 00000129 eae71f24 eae71ea8 1ea0: 813d4524 813d13bc 00000102 00000000 80287344 00000000 00000000 200002c0 1ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 b615fecd 1f00: eae71f24 8481cc80 00000000 200004c0 00000102 8020029c eae71fa4 eae71f28 1f20: 813d4d04 813d44a8 00000000 eae71f38 00000001 fffffff7 eae71df4 00000000 1f40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 1f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 1f80: 8020c910 b615fecd 00000000 00000000 001542c8 00000129 00000000 eae71fa8 1fa0: 80200060 813d4c9c 00000000 00000000 00000003 200004c0 00000102 00000000 1fc0: 00000000 00000000 001542c8 00000129 7e9dd336 7e9dd337 003d0f00 76b6c0fc 1fe0: 76b6bf08 76b6bef8 00016f30 000516d0 60000010 00000003 00000000 00000000 Call trace: [<8048162c>] (__kmap_local_page_prot) from [<80806f94>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8048162c>] (__kmap_local_page_prot) from [<80806f94>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806e9c>] (copy_page_to_iter) from [<81462088>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:84de5800 r4:84de5800 [<81461f98>] (sk_msg_recvmsg) from [<8168990c>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461f98>] (sk_msg_recvmsg) from [<8168990c>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:8474d400 r6:84c5f800 r5:000000c7 r4:86036d00 [<816897bc>] (unix_bpf_recvmsg) from [<81688654>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:eae71df4 r9:00000102 r8:00000000 r7:00000102 r6:8481cc80 r5:eae71f38 r4:816897bc [<8168861c>] (unix_dgram_recvmsg) from [<813d123c>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8168861c>] (unix_dgram_recvmsg) from [<813d123c>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:8168861c [<813d11ec>] (sock_recvmsg) from [<813d1440>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:8481cc80 r5:200004c0 r4:eae71f38 [<813d13b0>] (____sys_recvmsg) from [<813d4524>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:8474d400 r8:8481cc80 r7:00000102 r6:200004c0 r5:eae71f38 r4:00000000 [<813d449c>] (___sys_recvmsg) from [<813d4d04>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d449c>] (___sys_recvmsg) from [<813d4d04>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d449c>] (___sys_recvmsg) from [<813d4d04>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:8481cc80 [<813d4c90>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeae71fa8 to 0xeae71ff0) 1fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 1fc0: 00000000 00000000 001542c8 00000129 7e9dd336 7e9dd337 003d0f00 76b6c0fc 1fe0: 76b6bf08 76b6bef8 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