8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85204003, *pmd=fe752003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 4736 Comm: syz-executor.1 Not tainted 6.9.0-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 : [<804832e0>] lr : [<808097d4>] psr: 60000013 sp : dfe29ca0 ip : dfe29cb0 fp : dfe29cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84aeb000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8500e900 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 84aeb000 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 0xdfe28000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfe28000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 4736, stack limit = 0xdfe28000) Stack: (0xdfe29ca0 to 0xdfe2a000) 9ca0: dfe29ce4 dfe29cb0 808097d4 804832e0 dfe29cd4 dfe29f48 8024d45c 84aeb000 9cc0: 84aeb000 00000000 00000000 00000000 000000b3 00000018 dfe29d34 dfe29ce8 9ce0: 8146b8d4 808096e8 40000013 833fa040 844c3c00 844c3ce0 82e15200 844c3ce8 9d00: dfe29f48 00000000 dfe29d34 82e15200 000000b3 844c3c00 837d4800 00000001 9d20: 00000000 00000000 dfe29da4 dfe29d38 81692ef4 8146b7f0 00000000 00000000 9d40: 00000000 844c3ce0 844c3cd0 7fffffff 82e15288 844c3cfc 82e15434 dfe29f38 9d60: 00000000 837d4800 802a5054 00000100 00000122 e4a01891 dfe29f38 81692da4 9d80: dfe29f38 833fa000 00000000 00000000 00000000 dfe29df4 dfe29dc4 dfe29da8 9da0: 81691c88 81692db0 00000000 00000000 00000000 81691c50 dfe29de4 dfe29dc8 9dc0: 813d9658 81691c5c dfe29f38 200004c0 833fa000 00000000 dfe29ea4 dfe29de8 9de0: 813d985c 813d9614 00000001 00000000 dfe29e34 00000000 00000000 00000000 9e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e60: 00000000 00000000 00000000 00000000 00000000 e4a01891 00000000 00000000 9e80: dfe29f38 200004c0 00000000 833fa000 837d4800 00000129 dfe29f24 dfe29ea8 9ea0: 813dc940 813d97d8 00000000 00000000 80287b04 00000000 00000000 200006c0 9ec0: 000000b3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 e4a01891 9f00: dfe29f24 833fa000 00000000 200004c0 00000000 8020029c dfe29fa4 dfe29f28 9f20: 813dd120 813dc8c4 00000000 dfe29f38 00000001 fffffff7 dfe29df4 00000000 9f40: 00000000 00000000 00000000 00000000 200006c0 000000b3 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020c940 e4a01891 00000000 00000000 0014c2c8 00000129 00000000 dfe29fa8 9fa0: 80200060 813dd0b8 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7eeee32e 7eeee32f 003d0f00 76bdb0fc 9fe0: 76bdaf08 76bdaef8 00016d28 00051560 60000010 00000003 00000000 00000000 Call trace: [<804832d4>] (__kmap_local_page_prot) from [<808097d4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<804832d4>] (__kmap_local_page_prot) from [<808097d4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<808096dc>] (copy_page_to_iter) from [<8146b8d4>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000b3 r8:00000000 r7:00000000 r6:00000000 r5:84aeb000 r4:84aeb000 [<8146b7e4>] (sk_msg_recvmsg) from [<81692ef4>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8146b7e4>] (sk_msg_recvmsg) from [<81692ef4>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:837d4800 r6:844c3c00 r5:000000b3 r4:82e15200 [<81692da4>] (unix_bpf_recvmsg) from [<81691c88>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2482) r10:dfe29df4 r9:00000000 r8:00000000 r7:00000000 r6:833fa000 r5:dfe29f38 r4:81692da4 [<81691c50>] (unix_dgram_recvmsg) from [<813d9658>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81691c50>] (unix_dgram_recvmsg) from [<813d9658>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81691c50 [<813d9608>] (sock_recvmsg) from [<813d985c>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:833fa000 r5:200004c0 r4:dfe29f38 [<813d97cc>] (____sys_recvmsg) from [<813dc940>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:837d4800 r8:833fa000 r7:00000000 r6:200004c0 r5:dfe29f38 r4:00000000 [<813dc8b8>] (___sys_recvmsg) from [<813dd120>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813dc8b8>] (___sys_recvmsg) from [<813dd120>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813dc8b8>] (___sys_recvmsg) from [<813dd120>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:833fa000 [<813dd0ac>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe29fa8 to 0xdfe29ff0) 9fa0: 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7eeee32e 7eeee32f 003d0f00 76bdb0fc 9fe0: 76bdaf08 76bdaef8 00016d28 00051560 r7:00000129 r6:0014c2c8 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