8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8452b003, *pmd=e7447003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 20702 Comm: syz-executor.0 Not tainted 6.9.0-rc2-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 : [<80479e00>] lr : [<807eb304>] psr: 60000013 sp : dfa7dca0 ip : dfa7dcb0 fp : dfa7dcac r10: 00000018 r9 : 828584e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 841ea800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8550a900 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 841ea800 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 0xdfa7c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xdfa7c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.0 (pid: 20702, stack limit = 0xdfa7c000) Stack: (0xdfa7dca0 to 0xdfa7e000) dca0: dfa7dce4 dfa7dcb0 807eb304 80479e00 dfa7dcd4 dfa7df48 8024c880 841ea800 dcc0: 841ea800 00000000 00000000 00000000 000000c7 00000018 dfa7dd34 dfa7dce8 dce0: 8140bd2c 807eb218 00000000 25867383 85472600 854726d0 82cfb300 854726d8 dd00: dfa7df48 00000000 dfa7dd8c 82cfb300 000000c7 85472600 8558d400 00000000 dd20: 00000000 00000000 dfa7dda4 dfa7dd38 8162e758 8140bc48 00000000 00000000 dd40: 00000000 00000000 00000000 00000000 82cfb388 854726ec 82cfb534 dfa7df38 dd60: 00000000 25867383 8189bb08 8219b848 00000000 25867383 dfa7df38 8162e608 dd80: dfa7df38 84cf8f00 00000000 00000000 00000000 dfa7ddf4 dfa7ddc4 dfa7dda8 dda0: 8162d7f4 8162e614 00000000 00000000 00000000 8162d7bc dfa7dde4 dfa7ddc8 ddc0: 8137b318 8162d7c8 dfa7df38 84cf8f00 200004c0 00000000 dfa7dea4 dfa7dde8 dde0: 8137b518 8137b2d4 00000000 00000000 00000001 00000000 00000000 00000000 de00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de60: 00000000 00000000 00000000 00000000 00000000 25867383 00000000 00000000 de80: dfa7df38 200004c0 00000000 84cf8f00 8558d400 00000129 dfa7df24 dfa7dea8 dea0: 8137e45c 8137b494 00000000 00000000 00000008 00000000 00000000 200002c0 dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 25867383 df00: dfa7df24 84cf8f00 00000000 200004c0 00000000 80200288 dfa7dfa4 dfa7df28 df20: 8137ebd8 8137e3e0 00000000 dfa7df38 00000001 fffffff7 dfa7ddf4 00000000 df40: 00000000 00000000 00000000 00000000 200002c0 000000c7 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020ca6c 25867383 00000000 00000000 0014c2c8 00000129 00000000 dfa7dfa8 dfa0: 80200060 8137eb70 00000000 00000000 00000003 200004c0 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ed6532e 7ed6532f 003d0f00 76b6a0fc dfe0: 76b69f08 76b69ef8 000167f8 00050bc0 60000010 00000003 00000000 00000000 Call trace: [<80479df4>] (__kmap_local_page_prot) from [<807eb304>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479df4>] (__kmap_local_page_prot) from [<807eb304>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807eb20c>] (copy_page_to_iter) from [<8140bd2c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000000 r6:00000000 r5:841ea800 r4:841ea800 [<8140bc3c>] (sk_msg_recvmsg) from [<8162e758>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8140bc3c>] (sk_msg_recvmsg) from [<8162e758>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:8558d400 r6:85472600 r5:000000c7 r4:82cfb300 [<8162e608>] (unix_bpf_recvmsg) from [<8162d7f4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfa7ddf4 r9:00000000 r8:00000000 r7:00000000 r6:84cf8f00 r5:dfa7df38 r4:8162e608 [<8162d7bc>] (unix_dgram_recvmsg) from [<8137b318>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8162d7bc>] (unix_dgram_recvmsg) from [<8137b318>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:8162d7bc [<8137b2c8>] (sock_recvmsg) from [<8137b518>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:84cf8f00 r4:dfa7df38 [<8137b488>] (____sys_recvmsg) from [<8137e45c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:8558d400 r8:84cf8f00 r7:00000000 r6:200004c0 r5:dfa7df38 r4:00000000 [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:200004c0 r5:00000000 r4:84cf8f00 [<8137eb64>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfa7dfa8 to 0xdfa7dff0) dfa0: 00000000 00000000 00000003 200004c0 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ed6532e 7ed6532f 003d0f00 76b6a0fc dfe0: 76b69f08 76b69ef8 000167f8 00050bc0 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