8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84e4c003, *pmd=f0578003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 5398 Comm: syz-executor.0 Not tainted 6.10.0-rc3-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1103 [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 : [<80481680>] lr : [<80806d7c>] psr: 60000013 sp : e0761ca0 ip : e0761cb0 fp : e0761cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84628000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84df0100 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 84628000 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 0xe0760000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xe0760000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.0 (pid: 5398, stack limit = 0xe0760000) Stack: (0xe0761ca0 to 0xe0762000) 1ca0: e0761ce4 e0761cb0 80806d7c 80481680 e0761cd4 e0761f48 8024d2c4 84628000 1cc0: 84628000 00000000 00000000 00000000 000000b3 00000018 e0761d34 e0761ce8 1ce0: 81461940 80806c90 40000013 833907c0 84cfe400 84cfe4e0 845f8c00 84cfe4e8 1d00: e0761f48 00000000 e0761d34 845f8c00 000000b3 84cfe400 84d13c00 00000001 1d20: 00000000 00000000 e0761da4 e0761d38 8168912c 8146185c 00000000 00000000 1d40: 00000000 84cfe4e0 84cfe4d0 7fffffff 845f8c88 84cfe4fc 845f8e34 e0761f38 1d60: 00000000 84d13c00 802a4894 00000100 00000122 65b20dbc e0761f38 81688fdc 1d80: e0761f38 83390780 00000000 00000000 00000000 e0761df4 e0761dc4 e0761da8 1da0: 81687e74 81688fe8 00000000 00000000 00000000 81687e3c e0761de4 e0761dc8 1dc0: 813d0af4 81687e48 e0761f38 200004c0 83390780 00000000 e0761ea4 e0761de8 1de0: 813d0cf8 813d0ab0 00000001 00000000 e0761e34 00000000 00000000 00000000 1e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e60: 00000000 00000000 00000000 00000000 00000000 65b20dbc 00000000 00000000 1e80: e0761f38 200004c0 00000000 83390780 84d13c00 00000129 e0761f24 e0761ea8 1ea0: 813d3ddc 813d0c74 00000000 00000000 80287344 00000000 00000000 200006c0 1ec0: 000000b3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 65b20dbc 1f00: e0761f24 83390780 00000000 200004c0 00000000 8020029c e0761fa4 e0761f28 1f20: 813d45bc 813d3d60 00000000 e0761f38 00000001 fffffff7 e0761df4 00000000 1f40: 00000000 00000000 00000000 00000000 200006c0 000000b3 00000001 00000000 1f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 1f80: 8020c910 65b20dbc 00000000 00000000 001542c8 00000129 00000000 e0761fa8 1fa0: 80200060 813d4554 00000000 00000000 00000003 200004c0 00000000 00000000 1fc0: 00000000 00000000 001542c8 00000129 7eb3f336 7eb3f337 003d0f00 76b4c0fc 1fe0: 76b4bf08 76b4bef8 00016f30 00051660 60000010 00000003 00000000 00000000 Call trace: [<80481674>] (__kmap_local_page_prot) from [<80806d7c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80481674>] (__kmap_local_page_prot) from [<80806d7c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806c84>] (copy_page_to_iter) from [<81461940>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000b3 r8:00000000 r7:00000000 r6:00000000 r5:84628000 r4:84628000 [<81461850>] (sk_msg_recvmsg) from [<8168912c>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461850>] (sk_msg_recvmsg) from [<8168912c>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:84d13c00 r6:84cfe400 r5:000000b3 r4:845f8c00 [<81688fdc>] (unix_bpf_recvmsg) from [<81687e74>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:e0761df4 r9:00000000 r8:00000000 r7:00000000 r6:83390780 r5:e0761f38 r4:81688fdc [<81687e3c>] (unix_dgram_recvmsg) from [<813d0af4>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81687e3c>] (unix_dgram_recvmsg) from [<813d0af4>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81687e3c [<813d0aa4>] (sock_recvmsg) from [<813d0cf8>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:83390780 r5:200004c0 r4:e0761f38 [<813d0c68>] (____sys_recvmsg) from [<813d3ddc>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:84d13c00 r8:83390780 r7:00000000 r6:200004c0 r5:e0761f38 r4:00000000 [<813d3d54>] (___sys_recvmsg) from [<813d45bc>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d3d54>] (___sys_recvmsg) from [<813d45bc>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d3d54>] (___sys_recvmsg) from [<813d45bc>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:83390780 [<813d4548>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0761fa8 to 0xe0761ff0) 1fa0: 00000000 00000000 00000003 200004c0 00000000 00000000 1fc0: 00000000 00000000 001542c8 00000129 7eb3f336 7eb3f337 003d0f00 76b4c0fc 1fe0: 76b4bf08 76b4bef8 00016f30 00051660 r7:00000129 r6:001542c8 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