8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8d5d9003, *pmd=f0702003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 31643 Comm: syz-executor.1 Not tainted 6.7.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1109 [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 : [<8046aac8>] lr : [<807e2350>] psr: 60000013 sp : ead3dc00 ip : ead3dc10 fp : ead3dc0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8d765c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 97fc4640 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 8d765c00 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 0xead3c000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xead3c000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.1 (pid: 31643, stack limit = 0xead3c000) Stack: (0xead3dc00 to 0xead3e000) dc00: ead3dc44 ead3dc10 807e2350 8046aac8 ead3dc34 ead3def0 8024c5d8 8d765c00 dc20: 8d765c00 00000000 00000001 00000000 00000038 00000018 ead3dc94 ead3dc48 dc40: 813dbff8 807e2264 813db548 802de3a4 8d987600 8d9876d0 82f9de00 8d9876d8 dc60: ead3def0 00000000 00000000 82f9de00 00000038 8d987600 83c65400 00000000 dc80: 00000000 00000000 ead3dd04 ead3dc98 815f8fbc 813dbf14 00000000 00000002 dca0: ead3dcac 00000000 00000000 00000000 82f9dea8 8d9876ec 82f9e03c ead3dee0 dcc0: 00000000 00000000 00000000 00000000 00000000 fdf9641e 00000000 815f8e6c dce0: ead3dee0 849ae500 00000000 00000000 00000000 ead3dd54 ead3dd24 ead3dd08 dd00: 815f82fc 815f8e78 00000000 00000000 00000000 815f82c4 ead3dd44 ead3dd28 dd20: 813511fc 815f82d0 ead3dee0 849ae500 200003c0 00000000 ead3de04 ead3dd48 dd40: 81351400 813511b8 00000000 00000000 00000001 00000000 00000000 00000000 dd60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dd80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dda0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ddc0: 00000000 00000000 00000000 00000000 00000000 fdf9641e 00000000 00000000 dde0: ead3dee0 200003c0 00000000 849ae500 83c65400 00000001 ead3de84 ead3de08 de00: 81354318 8135137c 00000000 00000000 81a02a84 00000000 00000000 20000040 de20: 00000038 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 fdf9641e de60: ead3de84 ead3dec0 200003c0 00000000 00000000 00000000 ead3df5c ead3de88 de80: 81354440 8135429c 00000000 ead3de98 80893814 849ae500 00000001 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dec0: 000f4240 ead3ded8 00050b40 00000000 00000000 00000000 ead3df04 ead3dee8 dee0: ead3dd54 00000000 00000000 00000000 00000000 00000001 20000040 00000037 df00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 df20: 00000000 00000000 ead3df44 fdf9641e 81854328 00000003 200003c0 00000000 df40: 00000000 00000001 83c65400 0000016d ead3dfa4 ead3df60 81354e10 81354358 df60: 00000000 ead3dfb0 00000000 00000000 00000000 00000000 ead3dfac fdf9641e df80: 8020c9bc 00000000 00000000 0014c2d0 0000016d 80200288 00000000 ead3dfa8 dfa0: 80200060 81354d58 00000000 00000000 00000003 200003c0 00000001 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7ec4532e 7ec4532f 003d0f00 76b100fc dfe0: 76b0ff08 76b0fef8 000167d0 00050b40 60000010 00000003 00000000 00000000 Backtrace: [<8046aabc>] (__kmap_local_page_prot) from [<807e2350>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046aabc>] (__kmap_local_page_prot) from [<807e2350>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e2258>] (copy_page_to_iter) from [<813dbff8>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000038 r8:00000000 r7:00000001 r6:00000000 r5:8d765c00 r4:8d765c00 [<813dbf08>] (sk_msg_recvmsg) from [<815f8fbc>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813dbf08>] (sk_msg_recvmsg) from [<815f8fbc>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:83c65400 r6:8d987600 r5:00000038 r4:82f9de00 [<815f8e6c>] (unix_bpf_recvmsg) from [<815f82fc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:ead3dd54 r9:00000000 r8:00000000 r7:00000000 r6:849ae500 r5:ead3dee0 r4:815f8e6c [<815f82c4>] (unix_dgram_recvmsg) from [<813511fc>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f82c4>] (unix_dgram_recvmsg) from [<813511fc>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f82c4 [<813511ac>] (sock_recvmsg) from [<81351400>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200003c0 r5:849ae500 r4:ead3dee0 [<81351370>] (____sys_recvmsg) from [<81354318>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:83c65400 r8:849ae500 r7:00000000 r6:200003c0 r5:ead3dee0 r4:00000000 [<81354290>] (___sys_recvmsg) from [<81354440>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:200003c0 r4:ead3dec0 [<8135434c>] (do_recvmmsg) from [<81354e10>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8135434c>] (do_recvmmsg) from [<81354e10>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8135434c>] (do_recvmmsg) from [<81354e10>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:83c65400 r8:00000001 r7:00000000 r6:00000000 r5:200003c0 r4:00000003 [<81354d4c>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xead3dfa8 to 0xead3dff0) dfa0: 00000000 00000000 00000003 200003c0 00000001 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7ec4532e 7ec4532f 003d0f00 76b100fc dfe0: 76b0ff08 76b0fef8 000167d0 00050b40 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