8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8779e003, *pmd=e2c95003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 30466 Comm: syz-executor.0 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 : [<8046b9f4>] lr : [<807e9394>] psr: 60000013 sp : dfabdc20 ip : dfabdc30 fp : dfabdc2c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 859d9800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84eac640 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 859d9800 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 0xdfabc000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Register r12 information: 2-page vmalloc region starting at 0xdfabc000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Process syz-executor.0 (pid: 30466, stack limit = 0xdfabc000) Stack: (0xdfabdc20 to 0xdfabe000) dc20: dfabdc64 dfabdc30 807e9394 8046b9f4 dfabdc54 dfabdef0 8024c5ac 859d9800 dc40: 859d9800 00000000 00000000 00000000 00000041 00000018 dfabdcb4 dfabdc68 dc60: 813eb164 807e92a8 dfabdcec dfabdc78 87b49800 87b498d0 843af300 87b498d8 dc80: dfabdef0 00000000 dfabdc94 843af300 00000041 87b49800 8375e000 00000000 dca0: 00000000 00000000 dfabdd24 dfabdcb8 81608c88 813eb080 00000000 dfabdee0 dcc0: 00000000 49d03800 00d4a9fa 8219b7f4 843af3a8 87b498ec 843af534 dfabdee0 dce0: dfabdee0 831ac280 00000000 00000000 00000000 49d03800 dfabdd24 81608b38 dd00: 831ac280 20000d60 81607f90 00000000 00000000 dfabdd54 dfabdd44 dfabdd28 dd20: 81607fc8 81608b44 00000000 831ac280 20000d40 dfabdee0 dfabde04 dfabdd48 dd40: 8135e790 81607f9c 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 49d03800 00000000 00000000 dde0: dfabdee0 20000d60 00000000 831ac280 8375e000 00000002 dfabde84 dfabde08 de00: 81361604 8135e668 00000000 00000001 80314908 00000000 00000000 20000500 de20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 49d03800 de60: dfabde84 dfabdec0 20000d60 00000001 00000000 00000000 dfabdf5c dfabde88 de80: 8136172c 81361588 00000001 dfabde98 8089a8f0 831ac280 00000001 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dec0: 00000000 00000000 00050bb0 00000000 00000000 00000000 dfabdf04 dfabdee8 dee0: dfabdd54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 df00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 df20: 00000000 00000000 dfabdf44 49d03800 81867014 00000006 20000d40 00000000 df40: 00000000 00000002 8375e000 0000016d dfabdfa4 dfabdf60 813620fc 81361644 df60: 00000000 dfabdfb0 00000000 00000000 00000000 00000000 dfabdfac 49d03800 df80: 8020c9dc 00000000 00000000 0014c2d0 0000016d 80200288 00000000 dfabdfa8 dfa0: 80200060 81362044 00000000 00000000 00000006 20000d40 00000002 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7ec7c32e 7ec7c32f 003d0f00 76bf40fc dfe0: 76bf3f08 76bf3ef8 000167e8 00050bb0 60000010 00000006 00000000 00000000 Backtrace: [<8046b9e8>] (__kmap_local_page_prot) from [<807e9394>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046b9e8>] (__kmap_local_page_prot) from [<807e9394>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e929c>] (copy_page_to_iter) from [<813eb164>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:859d9800 r4:859d9800 [<813eb074>] (sk_msg_recvmsg) from [<81608c88>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813eb074>] (sk_msg_recvmsg) from [<81608c88>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:8375e000 r6:87b49800 r5:00000041 r4:843af300 [<81608b38>] (unix_bpf_recvmsg) from [<81607fc8>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:dfabdd54 r9:00000000 r8:00000000 r7:81607f90 r6:20000d60 r5:831ac280 r4:81608b38 [<81607f90>] (unix_dgram_recvmsg) from [<8135e790>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81607f90>] (unix_dgram_recvmsg) from [<8135e790>] (____sys_recvmsg+0x134/0x158 net/socket.c:2801) r4:dfabdee0 [<8135e65c>] (____sys_recvmsg) from [<81361604>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:8375e000 r8:831ac280 r7:00000000 r6:20000d60 r5:dfabdee0 r4:00000000 [<8136157c>] (___sys_recvmsg) from [<8136172c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:dfabdec0 [<81361638>] (do_recvmmsg) from [<813620fc>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<81361638>] (do_recvmmsg) from [<813620fc>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<81361638>] (do_recvmmsg) from [<813620fc>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:8375e000 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000006 [<81362038>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfabdfa8 to 0xdfabdff0) dfa0: 00000000 00000000 00000006 20000d40 00000002 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7ec7c32e 7ec7c32f 003d0f00 76bf40fc dfe0: 76bf3f08 76bf3ef8 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