8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8da4d003, *pmd=fbac9003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 13147 Comm: syz-executor.1 Not tainted 6.7.0-rc8-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1109 [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 : [<8046aac0>] lr : [<807e0b80>] psr: 60000013 sp : df9fdc00 ip : df9fdc10 fp : df9fdc0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8510dc00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8d2b83c0 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 8510dc00 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 0xdf9fc000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xdf9fc000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.1 (pid: 13147, stack limit = 0xdf9fc000) Stack: (0xdf9fdc00 to 0xdf9fe000) dc00: df9fdc44 df9fdc10 807e0b80 8046aac0 df9fdc34 df9fdef0 8024c5d8 8510dc00 dc20: 8510dc00 00000000 00000000 00000000 00000038 00000018 df9fdc94 df9fdc48 dc40: 813daa60 807e0a94 000243c0 84fc0800 8d98d200 8d98d2d0 83aaad00 8d98d2d8 dc60: df9fdef0 00000000 00000000 83aaad00 00000038 8d98d200 84dce000 00000000 dc80: 00000000 00000000 df9fdd04 df9fdc98 815f7a5c 813da97c 00000000 00000002 dca0: df9fdcac 00000000 00000000 00000000 83aaada8 8d98d2ec 83aaaf3c df9fdee0 dcc0: 00000000 00000000 00000000 00000000 00000000 bf18bfca 00000000 815f790c dce0: df9fdee0 84833180 00000000 00000000 00000000 df9fdd54 df9fdd24 df9fdd08 dd00: 815f6d9c 815f7918 00000000 00000000 00000000 815f6d64 df9fdd44 df9fdd28 dd20: 8134fc44 815f6d70 df9fdee0 84833180 20006000 00000000 df9fde04 df9fdd48 dd40: 8134fe48 8134fc00 00000000 00000000 00000001 00000000 00000000 00000000 dd60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dd80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dda0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ddc0: 00000000 00000000 00000000 00000000 00000000 bf18bfca 00000000 00000000 dde0: df9fdee0 20006000 00000000 84833180 84dce000 00000001 df9fde84 df9fde08 de00: 81352d80 8134fdc4 00000000 00000000 80313e90 00000000 00000000 20000040 de20: 00000038 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bf18bfca de60: df9fde84 df9fdec0 20006000 00000000 00000000 00000000 df9fdf5c df9fde88 de80: 81352ea8 81352d04 00000000 df9fde98 80892044 84833180 00000001 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dec0: 00000000 00000000 00050b40 00000000 00000000 00000000 df9fdf04 df9fdee8 dee0: df9fdd54 00000000 00000000 00000000 00000000 00000000 20000040 00000038 df00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 df20: 00000000 00000000 df9fdf44 bf18bfca 81852dc8 00000003 20006000 00000000 df40: 00000000 00000001 84dce000 0000016d df9fdfa4 df9fdf60 81353878 81352dc0 df60: 00000000 df9fdfb0 00000000 00000000 00000000 00000000 df9fdfac bf18bfca df80: 8020c9bc 00000000 00000000 0014c2d0 0000016d 80200288 00000000 df9fdfa8 dfa0: 80200060 813537c0 00000000 00000000 00000003 20006000 00000001 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7eee732e 7eee732f 003d0f00 76bcb0fc dfe0: 76bcaf08 76bcaef8 000167d0 00050b40 60000010 00000003 00000000 00000000 Backtrace: [<8046aab4>] (__kmap_local_page_prot) from [<807e0b80>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046aab4>] (__kmap_local_page_prot) from [<807e0b80>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e0a88>] (copy_page_to_iter) from [<813daa60>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000038 r8:00000000 r7:00000000 r6:00000000 r5:8510dc00 r4:8510dc00 [<813da970>] (sk_msg_recvmsg) from [<815f7a5c>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813da970>] (sk_msg_recvmsg) from [<815f7a5c>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84dce000 r6:8d98d200 r5:00000038 r4:83aaad00 [<815f790c>] (unix_bpf_recvmsg) from [<815f6d9c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:df9fdd54 r9:00000000 r8:00000000 r7:00000000 r6:84833180 r5:df9fdee0 r4:815f790c [<815f6d64>] (unix_dgram_recvmsg) from [<8134fc44>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f6d64>] (unix_dgram_recvmsg) from [<8134fc44>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f6d64 [<8134fbf4>] (sock_recvmsg) from [<8134fe48>] (____sys_recvmsg+0x90/0x158 net/socket.c:2805) r7:00000000 r6:20006000 r5:84833180 r4:df9fdee0 [<8134fdb8>] (____sys_recvmsg) from [<81352d80>] (___sys_recvmsg+0x88/0xbc net/socket.c:2847) r10:00000001 r9:84dce000 r8:84833180 r7:00000000 r6:20006000 r5:df9fdee0 r4:00000000 [<81352cf8>] (___sys_recvmsg) from [<81352ea8>] (do_recvmmsg+0xf4/0x298 net/socket.c:2941) r8:00000000 r7:00000000 r6:00000000 r5:20006000 r4:df9fdec0 [<81352db4>] (do_recvmmsg) from [<81353878>] (__sys_recvmmsg net/socket.c:3020 [inline]) [<81352db4>] (do_recvmmsg) from [<81353878>] (__do_sys_recvmmsg_time32 net/socket.c:3054 [inline]) [<81352db4>] (do_recvmmsg) from [<81353878>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3047) r10:0000016d r9:84dce000 r8:00000001 r7:00000000 r6:00000000 r5:20006000 r4:00000003 [<813537b4>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdf9fdfa8 to 0xdf9fdff0) dfa0: 00000000 00000000 00000003 20006000 00000001 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7eee732e 7eee732f 003d0f00 76bcb0fc dfe0: 76bcaf08 76bcaef8 000167d0 00050b40 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