8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=844dd003, *pmd=fe50a003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 24939 Comm: syz-executor.0 Not tainted 6.9.0-rc1-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 : [<80479dd0>] lr : [<807eb2d4>] psr: 60000013 sp : e09c9c20 ip : e09c9c30 fp : e09c9c2c r10: 00000018 r9 : 828584e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85a39000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 857a4080 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 85a39000 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 0xe09c8000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xe09c8000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.0 (pid: 24939, stack limit = 0xe09c8000) Stack: (0xe09c9c20 to 0xe09ca000) 9c20: e09c9c64 e09c9c30 807eb2d4 80479dd0 e09c9c54 e09c9ef0 8024c880 85a39000 9c40: 85a39000 00000000 00000000 00000000 00000041 00000018 e09c9cb4 e09c9c68 9c60: 8140bcfc 807eb1e8 85702634 00000000 85f27800 85f278d0 85702400 85f278d8 9c80: e09c9ef0 00000000 00000000 85702400 00000041 85f27800 859bc800 00000000 9ca0: 00000000 00000000 e09c9d24 e09c9cb8 8162e728 8140bc18 00000000 e09c9ee0 9cc0: 00000000 50afee75 01d75b07 8219b848 85702488 85f278ec 85702634 e09c9ee0 9ce0: e09c9ee0 849baf00 00000000 00000000 00000000 50afee75 e09c9d24 8162e5d8 9d00: 849baf00 20000d60 8162d78c 00000000 00000000 e09c9d54 e09c9d44 e09c9d28 9d20: 8162d7c4 8162e5e4 00000000 849baf00 20000d40 e09c9ee0 e09c9e04 e09c9d48 9d40: 8137b58c 8162d798 00000000 00000000 00000001 00000000 00000000 00000000 9d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9dc0: 00000000 00000000 00000000 00000000 00000000 50afee75 00000000 00000000 9de0: e09c9ee0 20000d60 00000000 849baf00 859bc800 00000002 e09c9e84 e09c9e08 9e00: 8137e42c 8137b464 00000000 00000001 8031cad8 00000000 00000000 20000500 9e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 50afee75 9e60: e09c9e84 e09c9ec0 20000d60 00000001 00000000 00000000 e09c9f5c e09c9e88 9e80: 8137e554 8137e3b0 00000001 e09c9e98 8089c340 849baf00 00000001 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ec0: 00000000 00000000 00050bc0 00000000 00000000 00000000 e09c9f04 e09c9ee8 9ee0: e09c9d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 e09c9f44 50afee75 81898d50 00000003 20000d40 00000000 9f40: 00000000 00000002 859bc800 0000016d e09c9fa4 e09c9f60 8137eee8 8137e46c 9f60: 00000000 e09c9fb0 00000000 00000000 00000000 00000000 e09c9fac 50afee75 9f80: 8020ca6c 00000000 00000000 0014c2d0 0000016d 80200288 00000000 e09c9fa8 9fa0: 80200060 8137ee30 00000000 00000000 00000003 20000d40 00000002 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7eb4932e 7eb4932f 003d0f00 76b5a0fc 9fe0: 76b59f08 76b59ef8 000167f8 00050bc0 60000010 00000003 00000000 00000000 Call trace: [<80479dc4>] (__kmap_local_page_prot) from [<807eb2d4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479dc4>] (__kmap_local_page_prot) from [<807eb2d4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807eb1dc>] (copy_page_to_iter) from [<8140bcfc>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:85a39000 r4:85a39000 [<8140bc0c>] (sk_msg_recvmsg) from [<8162e728>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8140bc0c>] (sk_msg_recvmsg) from [<8162e728>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:859bc800 r6:85f27800 r5:00000041 r4:85702400 [<8162e5d8>] (unix_bpf_recvmsg) from [<8162d7c4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:e09c9d54 r9:00000000 r8:00000000 r7:8162d78c r6:20000d60 r5:849baf00 r4:8162e5d8 [<8162d78c>] (unix_dgram_recvmsg) from [<8137b58c>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8162d78c>] (unix_dgram_recvmsg) from [<8137b58c>] (____sys_recvmsg+0x134/0x158 net/socket.c:2801) r4:e09c9ee0 [<8137b458>] (____sys_recvmsg) from [<8137e42c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:859bc800 r8:849baf00 r7:00000000 r6:20000d60 r5:e09c9ee0 r4:00000000 [<8137e3a4>] (___sys_recvmsg) from [<8137e554>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:e09c9ec0 [<8137e460>] (do_recvmmsg) from [<8137eee8>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8137e460>] (do_recvmmsg) from [<8137eee8>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8137e460>] (do_recvmmsg) from [<8137eee8>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:859bc800 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000003 [<8137ee24>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe09c9fa8 to 0xe09c9ff0) 9fa0: 00000000 00000000 00000003 20000d40 00000002 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7eb4932e 7eb4932f 003d0f00 76b5a0fc 9fe0: 76b59f08 76b59ef8 000167f8 00050bc0 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