8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85b76003, *pmd=fe667003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 14892 Comm: syz-executor.1 Not tainted 6.9.0-rc2-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 : [<80479e00>] lr : [<807eb2f4>] psr: 60000013 sp : dfc01ca0 ip : dfc01cb0 fp : dfc01cac r10: 00000018 r9 : 828584e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 86c35400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84513200 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 86c35400 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 0xdfc00000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xdfc00000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.1 (pid: 14892, stack limit = 0xdfc00000) Stack: (0xdfc01ca0 to 0xdfc02000) 1ca0: dfc01ce4 dfc01cb0 807eb2f4 80479e00 dfc01cd4 dfc01f48 8024c880 86c35400 1cc0: 86c35400 00000000 00000043 00000000 000000c7 00000018 dfc01d34 dfc01ce8 1ce0: 8140bd1c 807eb208 00000000 13f33e83 8512b600 8512b6d0 840fde00 8512b6d8 1d00: dfc01f48 00000002 dfc01d8c 840fde00 000000c7 8512b600 83ea6000 00000000 1d20: 00000102 00000000 dfc01da4 dfc01d38 8162e748 8140bc38 00000102 00000000 1d40: 00000000 00000000 00000000 00000000 840fde88 8512b6ec 840fe034 dfc01f38 1d60: 00000000 13f33e83 8189bb08 8219b848 00000102 13f33e83 dfc01f38 8162e5f8 1d80: dfc01f38 84aa8280 00000102 00000000 00000102 dfc01df4 dfc01dc4 dfc01da8 1da0: 8162d7e4 8162e604 00000000 00000102 00000000 8162d7ac dfc01de4 dfc01dc8 1dc0: 8137b308 8162d7b8 dfc01f38 84aa8280 200004c0 00000000 dfc01ea4 dfc01de8 1de0: 8137b508 8137b2c4 00000000 00000000 00000001 00000000 00000000 00000000 1e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e60: 00000000 00000000 00000000 00000000 00000000 13f33e83 00000000 00000000 1e80: dfc01f38 200004c0 00000102 84aa8280 83ea6000 00000129 dfc01f24 dfc01ea8 1ea0: 8137e44c 8137b484 00000102 00000000 00000008 00000000 00000000 200002c0 1ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 13f33e83 1f00: dfc01f24 84aa8280 00000000 200004c0 00000102 80200288 dfc01fa4 dfc01f28 1f20: 8137ebc8 8137e3d0 00000000 dfc01f38 00000001 fffffff7 dfc01df4 00000000 1f40: 00000000 00000000 00000000 00000043 200002c0 00000084 00000001 00000000 1f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 1f80: 8020ca6c 13f33e83 00000000 00000000 0014c2c8 00000129 00000000 dfc01fa8 1fa0: 80200060 8137eb60 00000000 00000000 00000003 200004c0 00000102 00000000 1fc0: 00000000 00000000 0014c2c8 00000129 7efdb32e 7efdb32f 003d0f00 76bb90fc 1fe0: 76bb8f08 76bb8ef8 00016820 00050bf0 60000010 00000003 00000000 00000000 Call trace: [<80479df4>] (__kmap_local_page_prot) from [<807eb2f4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479df4>] (__kmap_local_page_prot) from [<807eb2f4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807eb1fc>] (copy_page_to_iter) from [<8140bd1c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000043 r6:00000000 r5:86c35400 r4:86c35400 [<8140bc2c>] (sk_msg_recvmsg) from [<8162e748>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8140bc2c>] (sk_msg_recvmsg) from [<8162e748>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:83ea6000 r6:8512b600 r5:000000c7 r4:840fde00 [<8162e5f8>] (unix_bpf_recvmsg) from [<8162d7e4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfc01df4 r9:00000102 r8:00000000 r7:00000102 r6:84aa8280 r5:dfc01f38 r4:8162e5f8 [<8162d7ac>] (unix_dgram_recvmsg) from [<8137b308>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8162d7ac>] (unix_dgram_recvmsg) from [<8137b308>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:8162d7ac [<8137b2b8>] (sock_recvmsg) from [<8137b508>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:84aa8280 r4:dfc01f38 [<8137b478>] (____sys_recvmsg) from [<8137e44c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:83ea6000 r8:84aa8280 r7:00000102 r6:200004c0 r5:dfc01f38 r4:00000000 [<8137e3c4>] (___sys_recvmsg) from [<8137ebc8>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8137e3c4>] (___sys_recvmsg) from [<8137ebc8>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8137e3c4>] (___sys_recvmsg) from [<8137ebc8>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000102 r6:200004c0 r5:00000000 r4:84aa8280 [<8137eb54>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfc01fa8 to 0xdfc01ff0) 1fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 1fc0: 00000000 00000000 0014c2c8 00000129 7efdb32e 7efdb32f 003d0f00 76bb90fc 1fe0: 76bb8f08 76bb8ef8 00016820 00050bf0 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