8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=879fb003, *pmd=ec17b003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 1273 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: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 : [<8046bb14>] lr : [<807e9214>] psr: 60000013 sp : ec8d1c20 ip : ec8d1c30 fp : ec8d1c2c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 915e1000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 9603a1c0 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 915e1000 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 0xec8d0000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Register r12 information: 2-page vmalloc region starting at 0xec8d0000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2901 Process syz-executor.1 (pid: 1273, stack limit = 0xec8d0000) Stack: (0xec8d1c20 to 0xec8d2000) 1c20: ec8d1c64 ec8d1c30 807e9214 8046bb14 ec8d1c54 ec8d1ef0 8024c5ac 915e1000 1c40: 915e1000 00000000 00000000 00000000 00000041 00000018 ec8d1cb4 ec8d1c68 1c60: 813e54e4 807e9128 ec8d1cec ec8d1c78 86bf4200 86bf42d0 82cfdb00 86bf42d8 1c80: ec8d1ef0 00000000 ec8d1c94 82cfdb00 00000041 86bf4200 84233c00 00000000 1ca0: 00000000 00000000 ec8d1d24 ec8d1cb8 81603008 813e5400 00000000 ec8d1ee0 1cc0: 00000000 7eb97567 01939a3e 8219a7f4 82cfdba8 86bf42ec 82cfdd34 ec8d1ee0 1ce0: ec8d1ee0 83170c80 00000000 00000000 00000000 7eb97567 ec8d1d24 81602eb8 1d00: 83170c80 20000d60 81602310 00000000 00000000 ec8d1d54 ec8d1d44 ec8d1d28 1d20: 81602348 81602ec4 00000000 83170c80 20000d40 ec8d1ee0 ec8d1e04 ec8d1d48 1d40: 81358b14 8160231c 00000000 00000000 00000001 00000000 00000000 00000000 1d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1dc0: 00000000 00000000 00000000 00000000 00000000 7eb97567 00000000 00000000 1de0: ec8d1ee0 20000d60 00000000 83170c80 84233c00 00000002 ec8d1e84 ec8d1e08 1e00: 8135b988 813589ec 00000000 00000001 80314a28 00000000 00000000 20000500 1e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 7eb97567 1e60: ec8d1e84 ec8d1ec0 20000d60 00000001 00000000 00000000 ec8d1f5c ec8d1e88 1e80: 8135bab0 8135b90c 00000001 ec8d1e98 8089a770 83170c80 00000001 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ec0: 00000000 00000000 00050b40 00000000 00000000 00000000 ec8d1f04 ec8d1ee8 1ee0: ec8d1d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 1f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 1f20: 00000000 00000000 ec8d1f44 7eb97567 81861430 00000003 20000d40 00000000 1f40: 00000000 00000002 84233c00 0000016d ec8d1fa4 ec8d1f60 8135c480 8135b9c8 1f60: 00000000 ec8d1fb0 00000000 00000000 00000000 00000000 ec8d1fac 7eb97567 1f80: 8020c9dc 00000000 00000000 0014c2d0 0000016d 80200288 00000000 ec8d1fa8 1fa0: 80200060 8135c3c8 00000000 00000000 00000003 20000d40 00000002 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7ea1732e 7ea1732f 003d0f00 76b250fc 1fe0: 76b24f08 76b24ef8 000167d0 00050b40 60000010 00000003 00000000 00000000 Backtrace: [<8046bb08>] (__kmap_local_page_prot) from [<807e9214>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046bb08>] (__kmap_local_page_prot) from [<807e9214>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e911c>] (copy_page_to_iter) from [<813e54e4>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:915e1000 r4:915e1000 [<813e53f4>] (sk_msg_recvmsg) from [<81603008>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813e53f4>] (sk_msg_recvmsg) from [<81603008>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84233c00 r6:86bf4200 r5:00000041 r4:82cfdb00 [<81602eb8>] (unix_bpf_recvmsg) from [<81602348>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:ec8d1d54 r9:00000000 r8:00000000 r7:81602310 r6:20000d60 r5:83170c80 r4:81602eb8 [<81602310>] (unix_dgram_recvmsg) from [<81358b14>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81602310>] (unix_dgram_recvmsg) from [<81358b14>] (____sys_recvmsg+0x134/0x158 net/socket.c:2801) r4:ec8d1ee0 [<813589e0>] (____sys_recvmsg) from [<8135b988>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:84233c00 r8:83170c80 r7:00000000 r6:20000d60 r5:ec8d1ee0 r4:00000000 [<8135b900>] (___sys_recvmsg) from [<8135bab0>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:ec8d1ec0 [<8135b9bc>] (do_recvmmsg) from [<8135c480>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8135b9bc>] (do_recvmmsg) from [<8135c480>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8135b9bc>] (do_recvmmsg) from [<8135c480>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84233c00 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000003 [<8135c3bc>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xec8d1fa8 to 0xec8d1ff0) 1fa0: 00000000 00000000 00000003 20000d40 00000002 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7ea1732e 7ea1732f 003d0f00 76b250fc 1fe0: 76b24f08 76b24ef8 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