8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=852f8003, *pmd=e0008003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 15732 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 : eadd5c20 ip : eadd5c30 fp : eadd5c2c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 851d1c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85379680 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 851d1c00 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 0xeadd4000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Register r12 information: 2-page vmalloc region starting at 0xeadd4000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Process syz-executor.0 (pid: 15732, stack limit = 0xeadd4000) Stack: (0xeadd5c20 to 0xeadd6000) 5c20: eadd5c64 eadd5c30 807e9394 8046b9f4 eadd5c54 eadd5ef0 8024c5ac 851d1c00 5c40: 851d1c00 00000000 00000000 00000000 00001000 00000018 eadd5cb4 eadd5c68 5c60: 813eb164 807e92a8 40000013 8491a7c0 85914600 859146d0 82f47300 859146d8 5c80: eadd5ef0 00000000 eadd5cb4 82f47300 00001000 85914600 847f8000 00000001 5ca0: 00000000 00000000 eadd5d24 eadd5cb8 81608c88 813eb080 00000000 eadd5ee0 5cc0: 00000000 859146d0 859146c0 7fffffff 82f473a8 859146ec 82f47534 eadd5ee0 5ce0: 00000000 847f8000 802a12b4 00000100 00000122 af8b4be4 eadd5d24 81608b38 5d00: 8491a780 20006020 81607f90 00000000 00000000 eadd5d54 eadd5d44 eadd5d28 5d20: 81607fc8 81608b44 00000000 8491a780 20006000 eadd5ee0 eadd5e04 eadd5d48 5d40: 8135e790 81607f9c 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 af8b4be4 00000000 00000000 5de0: eadd5ee0 20006020 00000000 8491a780 847f8000 00000002 eadd5e84 eadd5e08 5e00: 81361604 8135e668 00000000 00000001 80314908 00000000 00000000 20000b40 5e20: 00001000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 af8b4be4 5e60: eadd5e84 eadd5ec0 20006020 00000001 00000000 00000000 eadd5f5c eadd5e88 5e80: 8136172c 81361588 00000001 eadd5e98 8089a8f0 8491a780 00000001 00000000 5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ec0: 00000000 00000000 00050bb0 00000000 00000000 00000000 eadd5f04 eadd5ee8 5ee0: eadd5d54 00000000 00000000 00000000 00000000 00000000 20000b40 00001000 5f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 eadd5f44 af8b4be4 81867014 00000003 20006000 00000000 5f40: 00000000 00000002 847f8000 0000016d eadd5fa4 eadd5f60 813620fc 81361644 5f60: 00000000 eadd5fb0 00000000 00000000 00000000 00000000 eadd5fac af8b4be4 5f80: 8020c9dc 00000000 00000000 0014c2d0 0000016d 80200288 00000000 eadd5fa8 5fa0: 80200060 81362044 00000000 00000000 00000003 20006000 00000002 00000000 5fc0: 00000000 00000000 0014c2d0 0000016d 7ed9732e 7ed9732f 003d0f00 76b290fc 5fe0: 76b28f08 76b28ef8 000167e8 00050bb0 60000010 00000003 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 r9:00001000 r8:00000000 r7:00000000 r6:00000000 r5:851d1c00 r4:851d1c00 [<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 r8:00000001 r7:847f8000 r6:85914600 r5:00001000 r4:82f47300 [<81608b38>] (unix_bpf_recvmsg) from [<81607fc8>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:eadd5d54 r9:00000000 r8:00000000 r7:81607f90 r6:20006020 r5:8491a780 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:eadd5ee0 [<8135e65c>] (____sys_recvmsg) from [<81361604>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:847f8000 r8:8491a780 r7:00000000 r6:20006020 r5:eadd5ee0 r4:00000000 [<8136157c>] (___sys_recvmsg) from [<8136172c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20006020 r4:eadd5ec0 [<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 r9:847f8000 r8:00000002 r7:00000000 r6:00000000 r5:20006000 r4:00000003 [<81362038>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xeadd5fa8 to 0xeadd5ff0) 5fa0: 00000000 00000000 00000003 20006000 00000002 00000000 5fc0: 00000000 00000000 0014c2d0 0000016d 7ed9732e 7ed9732f 003d0f00 76b290fc 5fe0: 76b28f08 76b28ef8 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