8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8596f003, *pmd=fe4c3003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 20817 Comm: syz-executor.0 Not tainted 6.9.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [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 : [<8047a19c>] lr : [<807e9bfc>] psr: 60000013 sp : dfeddc20 ip : dfeddc30 fp : dfeddc2c r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84e6b400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84f26900 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 84e6b400 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 0xdfedc000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfedc000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.0 (pid: 20817, stack limit = 0xdfedc000) Stack: (0xdfeddc20 to 0xdfede000) dc20: dfeddc64 dfeddc30 807e9bfc 8047a19c dfeddc54 dfeddef0 8024c860 84e6b400 dc40: 84e6b400 00000000 00000000 00000000 00000041 00000018 dfeddcb4 dfeddc68 dc60: 8143390c 807e9b10 dfeddcec dfeddc78 84d67000 84d670d0 84ebd200 84d670d8 dc80: dfeddef0 00000000 dfeddc94 84ebd200 00000041 84d67000 82f01800 00000000 dca0: 00000000 00000000 dfeddd24 dfeddcb8 816565d0 81433828 00000000 dfeddee0 dcc0: 00000000 9018c28b 00e72929 821a9848 84ebd288 84d670ec 84ebd434 dfeddee0 dce0: dfeddee0 831d8280 00000000 00000000 00000000 9018c28b dfeddd24 81656480 dd00: 831d8280 20000d60 81655614 00000000 00000000 dfeddd54 dfeddd44 dfeddd28 dd20: 8165564c 8165648c 00000000 831d8280 20000d40 dfeddee0 dfedde04 dfeddd48 dd40: 813a3128 81655620 00000000 00000000 00000001 00000000 00000000 00000000 dd60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dd80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dda0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ddc0: 00000000 00000000 00000000 00000000 00000000 9018c28b 00000000 00000000 dde0: dfeddee0 20000d60 00000000 831d8280 82f01800 00000002 dfedde84 dfedde08 de00: 813a5fc8 813a3000 00000000 00000001 8031cab4 00000000 00000000 20000500 de20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9018c28b de60: dfedde84 dfeddec0 20000d60 00000001 00000000 00000000 dfeddf5c dfedde88 de80: 813a60f0 813a5f4c 00000001 dfedde98 8089ac68 831d8280 00000001 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dec0: 00000000 00000000 00050bf0 00000000 00000000 00000000 dfeddf04 dfeddee8 dee0: dfeddd54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 df00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 df20: 00000000 00000000 dfeddf44 9018c28b 818c0b70 00000005 20000d40 00000000 df40: 00000000 00000002 82f01800 0000016d dfeddfa4 dfeddf60 813a6a84 813a6008 df60: 00000000 dfeddfb0 00000000 00000000 00000000 00000000 dfeddfac 9018c28b df80: 8020ca6c 00000000 00000000 0014c360 0000016d 80200288 00000000 dfeddfa8 dfa0: 80200060 813a69cc 00000000 00000000 00000005 20000d40 00000002 00000000 dfc0: 00000000 00000000 0014c360 0000016d 7eb9732e 7eb9732f 003d0f00 76ba40fc dfe0: 76ba3f08 76ba3ef8 00016ab0 00050bf0 60000010 00000005 00000000 00000000 Call trace: [<8047a190>] (__kmap_local_page_prot) from [<807e9bfc>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a190>] (__kmap_local_page_prot) from [<807e9bfc>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9b04>] (copy_page_to_iter) from [<8143390c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:84e6b400 r4:84e6b400 [<8143381c>] (sk_msg_recvmsg) from [<816565d0>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8143381c>] (sk_msg_recvmsg) from [<816565d0>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:82f01800 r6:84d67000 r5:00000041 r4:84ebd200 [<81656480>] (unix_bpf_recvmsg) from [<8165564c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfeddd54 r9:00000000 r8:00000000 r7:81655614 r6:20000d60 r5:831d8280 r4:81656480 [<81655614>] (unix_dgram_recvmsg) from [<813a3128>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81655614>] (unix_dgram_recvmsg) from [<813a3128>] (____sys_recvmsg+0x134/0x158 net/socket.c:2801) r4:dfeddee0 [<813a2ff4>] (____sys_recvmsg) from [<813a5fc8>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:82f01800 r8:831d8280 r7:00000000 r6:20000d60 r5:dfeddee0 r4:00000000 [<813a5f40>] (___sys_recvmsg) from [<813a60f0>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:dfeddec0 [<813a5ffc>] (do_recvmmsg) from [<813a6a84>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<813a5ffc>] (do_recvmmsg) from [<813a6a84>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<813a5ffc>] (do_recvmmsg) from [<813a6a84>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:82f01800 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000005 [<813a69c0>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfeddfa8 to 0xdfeddff0) dfa0: 00000000 00000000 00000005 20000d40 00000002 00000000 dfc0: 00000000 00000000 0014c360 0000016d 7eb9732e 7eb9732f 003d0f00 76ba40fc dfe0: 76ba3f08 76ba3ef8 00016ab0 00050bf0 r8:80200288 r7:0000016d r6:0014c360 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