8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84452003, *pmd=e6cb8003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 8942 Comm: syz-executor.1 Not tainted 6.8.0-rc6-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 : [<8046d174>] lr : [<807d2cc0>] psr: 60000013 sp : ebc39ca0 ip : ebc39cb0 fp : ebc39cac r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85065c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86a870c0 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 85065c00 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 0xebc38000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xebc38000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 8942, stack limit = 0xebc38000) Stack: (0xebc39ca0 to 0xebc3a000) 9ca0: ebc39ce4 ebc39cb0 807d2cc0 8046d174 ebc39cd4 ebc39f48 8024c7e8 85065c00 9cc0: 85065c00 00000000 00000000 00000000 000000a9 00000018 ebc39d34 ebc39ce8 9ce0: 813d9418 807d2bd4 40000013 831f9bc0 8504ac00 8504acd0 83414f00 8504acd8 9d00: ebc39f48 00000000 ebc39d34 83414f00 000000a9 8504ac00 84783000 00000001 9d20: 00000000 00000000 ebc39da4 ebc39d38 815f7cb8 813d9334 00000000 00000000 9d40: 00000000 8504acd0 8504acc0 7fffffff 83414fa8 8504acec 83415134 ebc39f38 9d60: 00000000 84783000 802a154c 00000100 00000122 a594ca08 ebc39f38 815f7b68 9d80: ebc39f38 831f9b80 00000000 00000000 00000000 ebc39df4 ebc39dc4 ebc39da8 9da0: 815f6fdc 815f7b74 00000000 00000000 00000000 815f6fa4 ebc39de4 ebc39dc8 9dc0: 8134c490 815f6fb0 ebc39f38 831f9b80 20003780 00000000 ebc39ea4 ebc39de8 9de0: 8134c694 8134c44c 00000000 00000000 00000001 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 a594ca08 00000000 00000000 9e80: ebc39f38 20003780 00000000 831f9b80 84783000 00000129 ebc39f24 ebc39ea8 9ea0: 8134f5ac 8134c610 00000000 00000000 00000008 00000000 00000000 20001f00 9ec0: 000000a9 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 a594ca08 9f00: ebc39f24 831f9b80 00000000 20003780 00000000 80200288 ebc39fa4 ebc39f28 9f20: 8134fd64 8134f530 00000000 ebc39f38 00000001 fffffff7 ebc39df4 00000000 9f40: 00000000 00000000 00000000 00000000 20001f00 000000a9 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020ca34 a594ca08 00000000 00000000 0014c2c8 00000129 00000000 ebc39fa8 9fa0: 80200060 8134fcfc 00000000 00000000 00000003 20003780 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7ee7f32e 7ee7f32f 003d0f00 76b740fc 9fe0: 76b73f08 76b73ef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d168>] (__kmap_local_page_prot) from [<807d2cc0>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d168>] (__kmap_local_page_prot) from [<807d2cc0>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2bc8>] (copy_page_to_iter) from [<813d9418>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000a9 r8:00000000 r7:00000000 r6:00000000 r5:85065c00 r4:85065c00 [<813d9328>] (sk_msg_recvmsg) from [<815f7cb8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d9328>] (sk_msg_recvmsg) from [<815f7cb8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:84783000 r6:8504ac00 r5:000000a9 r4:83414f00 [<815f7b68>] (unix_bpf_recvmsg) from [<815f6fdc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2468) r10:ebc39df4 r9:00000000 r8:00000000 r7:00000000 r6:831f9b80 r5:ebc39f38 r4:815f7b68 [<815f6fa4>] (unix_dgram_recvmsg) from [<8134c490>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f6fa4>] (unix_dgram_recvmsg) from [<8134c490>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f6fa4 [<8134c440>] (sock_recvmsg) from [<8134c694>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20003780 r5:831f9b80 r4:ebc39f38 [<8134c604>] (____sys_recvmsg) from [<8134f5ac>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:84783000 r8:831f9b80 r7:00000000 r6:20003780 r5:ebc39f38 r4:00000000 [<8134f524>] (___sys_recvmsg) from [<8134fd64>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8134f524>] (___sys_recvmsg) from [<8134fd64>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8134f524>] (___sys_recvmsg) from [<8134fd64>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20003780 r5:00000000 r4:831f9b80 [<8134fcf0>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xebc39fa8 to 0xebc39ff0) 9fa0: 00000000 00000000 00000003 20003780 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7ee7f32e 7ee7f32f 003d0f00 76b740fc 9fe0: 76b73f08 76b73ef8 000167e8 00050bb0 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