8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85a2f003, *pmd=fed55003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 9732 Comm: syz-executor.0 Not tainted 6.9.0-rc1-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [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 : [<80479d24>] lr : [<807eb0f4>] psr: 60000013 sp : dfc79c20 ip : dfc79c30 fp : dfc79c2c r10: 00000018 r9 : 828584e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8596a400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84594b00 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 8596a400 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 0xdfc78000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xdfc78000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.0 (pid: 9732, stack limit = 0xdfc78000) Stack: (0xdfc79c20 to 0xdfc7a000) 9c20: dfc79c64 dfc79c30 807eb0f4 80479d24 dfc79c54 dfc79ef0 8024c880 8596a400 9c40: 8596a400 00000000 00000000 00000000 00000041 00000018 dfc79cb4 dfc79c68 9c60: 8140afa4 807eb008 dfc79cec dfc79c78 8535ca00 8535cad0 845cbc00 8535cad8 9c80: dfc79ef0 00000000 dfc79c94 845cbc00 00000041 8535ca00 853a8000 00000000 9ca0: 00000000 00000000 dfc79d24 dfc79cb8 8162d698 8140aec0 00000000 00000000 9cc0: 00000000 853a8000 8162d548 dfc79ee0 845cbc88 8535caec 845cbe34 dfc79ee0 9ce0: dfc79d54 dfc79d24 dfc79d08 dfc79d08 8162c734 9779e02e 60000013 8162d548 9d00: 833c2000 20000d60 8162c6fc 00000000 00000000 dfc79d54 dfc79d44 dfc79d28 9d20: 8162c734 8162d554 00000000 833c2000 20000d40 dfc79ee0 dfc79e04 dfc79d48 9d40: 8137a834 8162c708 00000000 00000000 00000001 00000000 00000000 00000000 9d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9dc0: 00000000 00000000 00000000 00000000 00000000 9779e02e 00000000 00000000 9de0: dfc79ee0 20000d60 00000000 833c2000 853a8000 00000002 dfc79e84 dfc79e08 9e00: 8137d6d4 8137a70c 00000000 00000001 8031cac0 00000000 00000000 20000500 9e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9779e02e 9e60: dfc79e84 dfc79ec0 20000d60 00000001 00000000 00000000 dfc79f5c dfc79e88 9e80: 8137d7fc 8137d658 00000001 dfc79e98 8089c160 833c2000 00000001 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ec0: 00000000 00000000 00050bc0 00000000 00000000 00000000 dfc79f04 dfc79ee8 9ee0: dfc79d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 dfc79f44 9779e02e 81897c90 00000003 20000d40 00000000 9f40: 00000000 00000002 853a8000 0000016d dfc79fa4 dfc79f60 8137e190 8137d714 9f60: 00000000 dfc79fb0 00000000 00000000 00000000 00000000 dfc79fac 9779e02e 9f80: 8020ca6c 00000000 00000000 0014c2d0 0000016d 80200288 00000000 dfc79fa8 9fa0: 80200060 8137e0d8 00000000 00000000 00000003 20000d40 00000002 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7eac032e 7eac032f 003d0f00 76bf10fc 9fe0: 76bf0f08 76bf0ef8 000167f8 00050bc0 60000010 00000003 00000000 00000000 Call trace: [<80479d18>] (__kmap_local_page_prot) from [<807eb0f4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479d18>] (__kmap_local_page_prot) from [<807eb0f4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807eaffc>] (copy_page_to_iter) from [<8140afa4>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:8596a400 r4:8596a400 [<8140aeb4>] (sk_msg_recvmsg) from [<8162d698>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8140aeb4>] (sk_msg_recvmsg) from [<8162d698>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:853a8000 r6:8535ca00 r5:00000041 r4:845cbc00 [<8162d548>] (unix_bpf_recvmsg) from [<8162c734>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfc79d54 r9:00000000 r8:00000000 r7:8162c6fc r6:20000d60 r5:833c2000 r4:8162d548 [<8162c6fc>] (unix_dgram_recvmsg) from [<8137a834>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8162c6fc>] (unix_dgram_recvmsg) from [<8137a834>] (____sys_recvmsg+0x134/0x158 net/socket.c:2801) r4:dfc79ee0 [<8137a700>] (____sys_recvmsg) from [<8137d6d4>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:853a8000 r8:833c2000 r7:00000000 r6:20000d60 r5:dfc79ee0 r4:00000000 [<8137d64c>] (___sys_recvmsg) from [<8137d7fc>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:dfc79ec0 [<8137d708>] (do_recvmmsg) from [<8137e190>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8137d708>] (do_recvmmsg) from [<8137e190>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8137d708>] (do_recvmmsg) from [<8137e190>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:853a8000 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000003 [<8137e0cc>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfc79fa8 to 0xdfc79ff0) 9fa0: 00000000 00000000 00000003 20000d40 00000002 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7eac032e 7eac032f 003d0f00 76bf10fc 9fe0: 76bf0f08 76bf0ef8 000167f8 00050bc0 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