8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=853b8003, *pmd=e1023003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 28562 Comm: syz-executor.0 Not tainted 6.8.0-rc1-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 : [<8046d014>] lr : [<807d3648>] psr: 60000013 sp : df9b5c00 ip : df9b5c10 fp : df9b5c0c r10: 00000018 r9 : 8284f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 852df000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 897a7a80 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 852df000 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 0xdf9b4000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xdf9b4000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 28562, stack limit = 0xdf9b4000) Stack: (0xdf9b5c00 to 0xdf9b6000) 5c00: df9b5c44 df9b5c10 807d3648 8046d014 df9b5c34 df9b5ef0 8024c824 852df000 5c20: 852df000 00000000 00000000 00000000 00000045 00000018 df9b5c94 df9b5c48 5c40: 813d8b84 807d355c 00000000 dbdc9a0d 83eb9400 83eb94d0 82e01800 83eb94d8 5c60: df9b5ef0 00000000 df9b5cec 82e01800 00000045 83eb9400 84723c00 00000000 5c80: 00000000 00000000 df9b5d04 df9b5c98 815f6dc8 813d8aa0 00000000 00000000 5ca0: 00000000 00000000 00000000 00000000 82e018a8 83eb94ec 82e01a34 df9b5ee0 5cc0: 00000000 dbdc9a0d 04200e38 821907f4 00000000 dbdc9a0d df9b5ee0 815f6c78 5ce0: df9b5ee0 8322ef00 00000000 00000000 00000000 df9b5d54 df9b5d24 df9b5d08 5d00: 815f6108 815f6c84 00000000 00000000 00000000 815f60d0 df9b5d44 df9b5d28 5d20: 8134bc40 815f60dc df9b5ee0 8322ef00 20000a40 00000000 df9b5e04 df9b5d48 5d40: 8134be44 8134bbfc 00000000 00000000 00000001 00000000 00000000 00000000 5d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5dc0: 00000000 00000000 00000000 00000000 00000000 dbdc9a0d 00000000 00000000 5de0: df9b5ee0 20000a40 00000000 8322ef00 84723c00 00000001 df9b5e84 df9b5e08 5e00: 8134ed5c 8134bdc0 00000000 00000000 80314d28 00000000 00000000 20000500 5e20: 00000045 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dbdc9a0d 5e60: df9b5e84 df9b5ec0 20000a40 00000000 00000000 00000000 df9b5f5c df9b5e88 5e80: 8134ee84 8134ece0 00000000 df9b5e98 80884ba8 8322ef00 00000001 00000000 5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ec0: 00000000 00000000 00050bd0 00000000 00000000 00000000 df9b5f04 df9b5ee8 5ee0: df9b5d54 00000000 00000000 00000000 00000000 00000000 20000500 00000045 5f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 df9b5f44 dbdc9a0d 818550d8 00000003 20000a40 00000000 5f40: 00000000 00000001 84723c00 0000016d df9b5fa4 df9b5f60 8134f854 8134ed9c 5f60: 00000000 df9b5fb0 00000000 00000000 00000000 00000000 df9b5fac dbdc9a0d 5f80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 df9b5fa8 5fa0: 80200060 8134f79c 00000000 00000000 00000003 20000a40 00000001 00000000 5fc0: 00000000 00000000 0014c2d0 0000016d 7eafe326 7eafe327 003d0f00 76b510fc 5fe0: 76b50f08 76b50ef8 000167e8 00050bd0 60000010 00000003 00000000 00000000 Backtrace: [<8046d008>] (__kmap_local_page_prot) from [<807d3648>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d008>] (__kmap_local_page_prot) from [<807d3648>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d3550>] (copy_page_to_iter) from [<813d8b84>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000045 r8:00000000 r7:00000000 r6:00000000 r5:852df000 r4:852df000 [<813d8a94>] (sk_msg_recvmsg) from [<815f6dc8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d8a94>] (sk_msg_recvmsg) from [<815f6dc8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84723c00 r6:83eb9400 r5:00000045 r4:82e01800 [<815f6c78>] (unix_bpf_recvmsg) from [<815f6108>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:df9b5d54 r9:00000000 r8:00000000 r7:00000000 r6:8322ef00 r5:df9b5ee0 r4:815f6c78 [<815f60d0>] (unix_dgram_recvmsg) from [<8134bc40>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f60d0>] (unix_dgram_recvmsg) from [<8134bc40>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f60d0 [<8134bbf0>] (sock_recvmsg) from [<8134be44>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000a40 r5:8322ef00 r4:df9b5ee0 [<8134bdb4>] (____sys_recvmsg) from [<8134ed5c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:84723c00 r8:8322ef00 r7:00000000 r6:20000a40 r5:df9b5ee0 r4:00000000 [<8134ecd4>] (___sys_recvmsg) from [<8134ee84>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20000a40 r4:df9b5ec0 [<8134ed90>] (do_recvmmsg) from [<8134f854>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134ed90>] (do_recvmmsg) from [<8134f854>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134ed90>] (do_recvmmsg) from [<8134f854>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84723c00 r8:00000001 r7:00000000 r6:00000000 r5:20000a40 r4:00000003 [<8134f790>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdf9b5fa8 to 0xdf9b5ff0) 5fa0: 00000000 00000000 00000003 20000a40 00000001 00000000 5fc0: 00000000 00000000 0014c2d0 0000016d 7eafe326 7eafe327 003d0f00 76b510fc 5fe0: 76b50f08 76b50ef8 000167e8 00050bd0 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