8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=984f0003, *pmd=e405c003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 29360 Comm: syz-executor.0 Not tainted 6.8.0-rc4-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 : [<8046d114>] lr : [<807d28b0>] psr: 60000013 sp : e01e9c00 ip : e01e9c10 fp : e01e9c0c r10: 00000018 r9 : 8284f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 851bf800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 957aae80 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 851bf800 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 0xe01e8000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xe01e8000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 29360, stack limit = 0xe01e8000) Stack: (0xe01e9c00 to 0xe01ea000) 9c00: e01e9c44 e01e9c10 807d28b0 8046d114 e01e9c34 e01e9ef0 8024c7e8 851bf800 9c20: 851bf800 00000000 00000000 00000000 00000003 00000018 e01e9c94 e01e9c48 9c40: 813d8184 807d27c4 40000013 833f3bc0 8941e400 8941e4d0 850ded00 8941e4d8 9c60: e01e9ef0 00000000 e01e9c94 850ded00 00000003 8941e400 83e62400 00000001 9c80: 00000000 00000000 e01e9d04 e01e9c98 815f68b4 813d80a0 00000000 80279908 9ca0: 815f5b98 8941e4d0 8941e4c0 7fffffff 850deda8 8941e4ec 850def34 e01e9ee0 9cc0: 00000000 83e62400 802a1564 00000100 00000122 602896d4 00000000 815f6764 9ce0: e01e9ee0 833f3b80 00000000 00000000 00000000 e01e9d54 e01e9d24 e01e9d08 9d00: 815f5ba8 815f6770 00000000 00000000 00000000 815f5b70 e01e9d44 e01e9d28 9d20: 8134b260 815f5b7c e01e9ee0 833f3b80 20000fc0 00000000 e01e9e04 e01e9d48 9d40: 8134b464 8134b21c 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 602896d4 00000000 00000000 9de0: e01e9ee0 20000fc0 00000000 833f3b80 83e62400 00000001 e01e9e84 e01e9e08 9e00: 8134e37c 8134b3e0 00000000 00000000 81a02a94 00000000 00000000 20000040 9e20: 00000003 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 602896d4 9e60: e01e9e84 e01e9ec0 20000fc0 00000000 00000000 00000000 e01e9f5c e01e9e88 9e80: 8134e4a4 8134e300 00000000 e01e9e98 80883e10 833f3b80 00000001 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ec0: 000f4240 e01e9ed8 00050bb0 00000000 00000000 00000000 e01e9f04 e01e9ee8 9ee0: e01e9d54 00000000 00000000 00000000 00000000 00000000 20000040 00000003 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 e01e9f44 602896d4 81854ca0 00000003 20000fc0 00000000 9f40: 00000000 00000001 83e62400 0000016d e01e9fa4 e01e9f60 8134ee74 8134e3bc 9f60: 00000000 e01e9fb0 00000000 00000000 00000000 00000000 e01e9fac 602896d4 9f80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 e01e9fa8 9fa0: 80200060 8134edbc 00000000 00000000 00000003 20000fc0 00000001 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7ef7b32e 7ef7b32f 003d0f00 76b900fc 9fe0: 76b8ff08 76b8fef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d108>] (__kmap_local_page_prot) from [<807d28b0>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d108>] (__kmap_local_page_prot) from [<807d28b0>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d27b8>] (copy_page_to_iter) from [<813d8184>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000003 r8:00000000 r7:00000000 r6:00000000 r5:851bf800 r4:851bf800 [<813d8094>] (sk_msg_recvmsg) from [<815f68b4>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d8094>] (sk_msg_recvmsg) from [<815f68b4>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:83e62400 r6:8941e400 r5:00000003 r4:850ded00 [<815f6764>] (unix_bpf_recvmsg) from [<815f5ba8>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2481) r10:e01e9d54 r9:00000000 r8:00000000 r7:00000000 r6:833f3b80 r5:e01e9ee0 r4:815f6764 [<815f5b70>] (unix_dgram_recvmsg) from [<8134b260>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f5b70>] (unix_dgram_recvmsg) from [<8134b260>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f5b70 [<8134b210>] (sock_recvmsg) from [<8134b464>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000fc0 r5:833f3b80 r4:e01e9ee0 [<8134b3d4>] (____sys_recvmsg) from [<8134e37c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:83e62400 r8:833f3b80 r7:00000000 r6:20000fc0 r5:e01e9ee0 r4:00000000 [<8134e2f4>] (___sys_recvmsg) from [<8134e4a4>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20000fc0 r4:e01e9ec0 [<8134e3b0>] (do_recvmmsg) from [<8134ee74>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134e3b0>] (do_recvmmsg) from [<8134ee74>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134e3b0>] (do_recvmmsg) from [<8134ee74>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:83e62400 r8:00000001 r7:00000000 r6:00000000 r5:20000fc0 r4:00000003 [<8134edb0>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe01e9fa8 to 0xe01e9ff0) 9fa0: 00000000 00000000 00000003 20000fc0 00000001 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7ef7b32e 7ef7b32f 003d0f00 76b900fc 9fe0: 76b8ff08 76b8fef8 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