8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8508f003, *pmd=fc05a003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 3959 Comm: syz-executor.1 Not tainted 6.7.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1097 [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:379 pc : [<8046c0bc>] lr : [<807eb10c>] psr: 60000013 sp : dfd35c00 ip : dfd35c10 fp : dfd35c0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f7f000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 850a4fc0 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 84f7f000 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 0xdfd34000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Register r12 information: 2-page vmalloc region starting at 0xdfd34000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Process syz-executor.1 (pid: 3959, stack limit = 0xdfd34000) Stack: (0xdfd35c00 to 0xdfd36000) 5c00: dfd35c44 dfd35c10 807eb10c 8046c0bc dfd35c34 dfd35ef0 8024c7e4 84f7f000 5c20: 84f7f000 00000000 00000001 00000000 0000005c 00000018 dfd35c94 dfd35c48 5c40: 813ed474 807eb020 00000000 3f6f991d 84e1bc00 84e1bcd0 83905500 84e1bcd8 5c60: dfd35ef0 00000000 dfd35cec 83905500 0000005c 84e1bc00 84d3a400 00000000 5c80: 00000000 00000000 dfd35d04 dfd35c98 8160b088 813ed390 00000000 00000000 5ca0: 00000000 00000000 00000000 00000000 839055a8 84e1bcec 83905734 dfd35ee0 5cc0: 00000000 3f6f991d 01bfe042 8219b7f4 00000000 3f6f991d dfd35ee0 8160af38 5ce0: dfd35ee0 84802500 00000000 00000000 00000000 dfd35d54 dfd35d24 dfd35d08 5d00: 8160a3c8 8160af44 00000000 00000000 00000000 8160a390 dfd35d44 dfd35d28 5d20: 813607f8 8160a39c dfd35ee0 84802500 20001c80 00000000 dfd35e04 dfd35d48 5d40: 813609fc 813607b4 00000000 00000000 00000001 00000000 00000000 00000000 5d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5dc0: 00000000 00000000 00000000 00000000 00000000 3f6f991d 00000000 00000000 5de0: dfd35ee0 20001c80 00000000 84802500 84d3a400 00000001 dfd35e84 dfd35e08 5e00: 81363914 81360978 00000000 00000000 80314ba0 00000000 00000000 20000340 5e20: 0000005c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3f6f991d 5e60: dfd35e84 dfd35ec0 20001c80 00000000 00000000 00000000 dfd35f5c dfd35e88 5e80: 81363a3c 81363898 00000000 dfd35e98 8089c668 84802500 00000001 00000000 5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ec0: 00000000 00000000 00050bb0 00000000 00000000 00000000 dfd35f04 dfd35ee8 5ee0: dfd35d54 00000000 00000000 00000000 00000000 00000001 20000340 0000005b 5f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 dfd35f44 3f6f991d 81869414 00000003 20001c80 00000000 5f40: 00000000 00000001 84d3a400 0000016d dfd35fa4 dfd35f60 8136440c 81363954 5f60: 00000000 dfd35fb0 00000000 00000000 00000000 00000000 dfd35fac 3f6f991d 5f80: 8020ca04 00000000 00000000 0014c2d0 0000016d 80200288 00000000 dfd35fa8 5fa0: 80200060 81364354 00000000 00000000 00000003 20001c80 00000001 00000000 5fc0: 00000000 00000000 0014c2d0 0000016d 7e9aa32e 7e9aa32f 003d0f00 76b840fc 5fe0: 76b83f08 76b83ef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046c0b0>] (__kmap_local_page_prot) from [<807eb10c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046c0b0>] (__kmap_local_page_prot) from [<807eb10c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807eb014>] (copy_page_to_iter) from [<813ed474>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:0000005c r8:00000000 r7:00000001 r6:00000000 r5:84f7f000 r4:84f7f000 [<813ed384>] (sk_msg_recvmsg) from [<8160b088>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813ed384>] (sk_msg_recvmsg) from [<8160b088>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84d3a400 r6:84e1bc00 r5:0000005c r4:83905500 [<8160af38>] (unix_bpf_recvmsg) from [<8160a3c8>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:dfd35d54 r9:00000000 r8:00000000 r7:00000000 r6:84802500 r5:dfd35ee0 r4:8160af38 [<8160a390>] (unix_dgram_recvmsg) from [<813607f8>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8160a390>] (unix_dgram_recvmsg) from [<813607f8>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:8160a390 [<813607a8>] (sock_recvmsg) from [<813609fc>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20001c80 r5:84802500 r4:dfd35ee0 [<8136096c>] (____sys_recvmsg) from [<81363914>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:84d3a400 r8:84802500 r7:00000000 r6:20001c80 r5:dfd35ee0 r4:00000000 [<8136388c>] (___sys_recvmsg) from [<81363a3c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20001c80 r4:dfd35ec0 [<81363948>] (do_recvmmsg) from [<8136440c>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<81363948>] (do_recvmmsg) from [<8136440c>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<81363948>] (do_recvmmsg) from [<8136440c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84d3a400 r8:00000001 r7:00000000 r6:00000000 r5:20001c80 r4:00000003 [<81364348>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfd35fa8 to 0xdfd35ff0) 5fa0: 00000000 00000000 00000003 20001c80 00000001 00000000 5fc0: 00000000 00000000 0014c2d0 0000016d 7e9aa32e 7e9aa32f 003d0f00 76b840fc 5fe0: 76b83f08 76b83ef8 000167e8 00050bb0 r8:80200288 r7:0000016d r6:0014c2d0 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