8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85ceb003, *pmd=fe088003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 27078 Comm: syz-executor.0 Not tainted 6.8.0-rc5-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 : [<8046d144>] lr : [<807d28d8>] psr: 60000013 sp : dfc99ca0 ip : dfc99cb0 fp : dfc99cac r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 846d7400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84fa1a40 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 846d7400 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 0xdfc98000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xdfc98000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 27078, stack limit = 0xdfc98000) Stack: (0xdfc99ca0 to 0xdfc9a000) 9ca0: dfc99ce4 dfc99cb0 807d28d8 8046d144 dfc99cd4 dfc99f48 8024c7e8 846d7400 9cc0: 846d7400 00000000 00000000 00000000 00000080 00000018 dfc99d34 dfc99ce8 9ce0: 813d839c 807d27ec 40000013 83248540 8510fc00 8510fcd0 845e4000 8510fcd8 9d00: dfc99f48 00000000 dfc99d34 845e4000 00000080 8510fc00 846b6000 00000001 9d20: 00000000 00000000 dfc99da4 dfc99d38 815f6ad4 813d82b8 00000000 00000000 9d40: 00000000 8510fcd0 8510fcc0 7fffffff 845e40a8 8510fcec 845e4234 dfc99f38 9d60: 00000000 846b6000 802a154c 00000100 00000122 86e27915 dfc99f38 815f6984 9d80: dfc99f38 83248500 00000000 00000000 00000000 dfc99df4 dfc99dc4 dfc99da8 9da0: 815f5de0 815f6990 00000000 00000000 00000000 815f5da8 dfc99de4 dfc99dc8 9dc0: 8134b450 815f5db4 dfc99f38 83248500 20000800 00000000 dfc99ea4 dfc99de8 9de0: 8134b654 8134b40c 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 86e27915 00000000 00000000 9e80: dfc99f38 20000800 00000000 83248500 846b6000 00000129 dfc99f24 dfc99ea8 9ea0: 8134e56c 8134b5d0 00000000 00000000 00000008 00000000 00000000 200003c0 9ec0: 00000080 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 86e27915 9f00: dfc99f24 83248500 00000000 20000800 00000000 80200288 dfc99fa4 dfc99f28 9f20: 8134ed24 8134e4f0 00000000 dfc99f38 00000001 fffffff7 dfc99df4 00000000 9f40: 00000000 00000000 00000000 00000000 200003c0 00000080 00000001 00000000 9f60: 00000000 00000001 00000000 00000002 00000000 00000000 00000000 00000000 9f80: 8020ca34 86e27915 00000000 00000000 0014c2c8 00000129 00000000 dfc99fa8 9fa0: 80200060 8134ecbc 00000000 00000000 00000004 20000800 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7ef9f32e 7ef9f32f 003d0f00 76b310fc 9fe0: 76b30f08 76b30ef8 000167e8 00050bb0 60000010 00000004 00000000 00000000 Backtrace: [<8046d138>] (__kmap_local_page_prot) from [<807d28d8>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d138>] (__kmap_local_page_prot) from [<807d28d8>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d27e0>] (copy_page_to_iter) from [<813d839c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000080 r8:00000000 r7:00000000 r6:00000000 r5:846d7400 r4:846d7400 [<813d82ac>] (sk_msg_recvmsg) from [<815f6ad4>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d82ac>] (sk_msg_recvmsg) from [<815f6ad4>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:846b6000 r6:8510fc00 r5:00000080 r4:845e4000 [<815f6984>] (unix_bpf_recvmsg) from [<815f5de0>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2481) r10:dfc99df4 r9:00000000 r8:00000000 r7:00000000 r6:83248500 r5:dfc99f38 r4:815f6984 [<815f5da8>] (unix_dgram_recvmsg) from [<8134b450>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f5da8>] (unix_dgram_recvmsg) from [<8134b450>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f5da8 [<8134b400>] (sock_recvmsg) from [<8134b654>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000800 r5:83248500 r4:dfc99f38 [<8134b5c4>] (____sys_recvmsg) from [<8134e56c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:846b6000 r8:83248500 r7:00000000 r6:20000800 r5:dfc99f38 r4:00000000 [<8134e4e4>] (___sys_recvmsg) from [<8134ed24>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8134e4e4>] (___sys_recvmsg) from [<8134ed24>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8134e4e4>] (___sys_recvmsg) from [<8134ed24>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20000800 r5:00000000 r4:83248500 [<8134ecb0>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfc99fa8 to 0xdfc99ff0) 9fa0: 00000000 00000000 00000004 20000800 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7ef9f32e 7ef9f32f 003d0f00 76b310fc 9fe0: 76b30f08 76b30ef8 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