8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=854aa003, *pmd=e0546003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 11621 Comm: syz-executor.0 Not tainted 6.8.0-rc5-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 : [<8046d174>] lr : [<807d2910>] psr: 60000013 sp : eaed9d40 ip : eaed9d50 fp : eaed9d4c r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8575b400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8c98a5c0 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 8575b400 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 0xeaed8000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xeaed8000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 11621, stack limit = 0xeaed8000) Stack: (0xeaed9d40 to 0xeaeda000) 9d40: eaed9d84 eaed9d50 807d2910 8046d174 eaed9d74 eaed9ea0 8024c7e8 8575b400 9d60: 8575b400 00000000 00000000 00000000 00001000 00000018 eaed9dd4 eaed9d88 9d80: 813d8398 807d2824 40000013 84816cc0 8456fa00 8456fad0 859ab300 8456fad8 9da0: eaed9ea0 00000000 eaed9dd4 859ab300 00001000 8456fa00 851f0000 00000001 9dc0: 00000000 00000000 eaed9e44 eaed9dd8 815f6c38 813d82b4 00000000 00000000 9de0: 00000000 8456fad0 8456fac0 7fffffff 859ab3a8 8456faec 859ab534 eaed9e90 9e00: 00000000 851f0000 802a154c 00000100 00000122 bffa294c eaed9e90 815f6ae8 9e20: eaed9e90 84816c80 00000000 00000000 00000000 00001000 eaed9e64 eaed9e48 9e40: 815f5f5c 815f6af4 00000000 00000000 00000000 815f5f24 eaed9e84 eaed9e68 9e60: 8134b410 815f5f30 00000000 00000000 84816c80 eaed9edc eaed9f8c eaed9e88 9e80: 8134dcd0 8134b3cc fffffff7 00000001 00000000 00000000 00000000 00000000 9ea0: 00000000 00000000 20000680 00001000 00000001 00000000 00000000 00000000 9ec0: 00000000 00000000 00000000 00000000 00000000 00000000 eaed9f04 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9f00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9f40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bffa294c 9f60: 8261c978 00000000 00000000 0014c2d4 00000124 80200288 851f0000 00000124 9f80: eaed9fa4 eaed9f90 8134dd6c 8134dc14 00000000 00000000 00000000 eaed9fa8 9fa0: 80200060 8134dd5c 00000000 00000000 00000003 20000680 00001000 00000000 9fc0: 00000000 00000000 0014c2d4 00000124 7ee8732e 7ee8732f 003d0f00 76bfa0fc 9fe0: 76bf9f08 76bf9ef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d168>] (__kmap_local_page_prot) from [<807d2910>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d168>] (__kmap_local_page_prot) from [<807d2910>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2818>] (copy_page_to_iter) from [<813d8398>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00001000 r8:00000000 r7:00000000 r6:00000000 r5:8575b400 r4:8575b400 [<813d82a8>] (sk_msg_recvmsg) from [<815f6c38>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d82a8>] (sk_msg_recvmsg) from [<815f6c38>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:851f0000 r6:8456fa00 r5:00001000 r4:859ab300 [<815f6ae8>] (unix_bpf_recvmsg) from [<815f5f5c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2468) r10:00001000 r9:00000000 r8:00000000 r7:00000000 r6:84816c80 r5:eaed9e90 r4:815f6ae8 [<815f5f24>] (unix_dgram_recvmsg) from [<8134b410>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f5f24>] (unix_dgram_recvmsg) from [<8134b410>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f5f24 [<8134b3c0>] (sock_recvmsg) from [<8134dcd0>] (__sys_recvfrom+0xc8/0x148 net/socket.c:2242) r7:eaed9edc r6:84816c80 r5:00000000 r4:00000000 [<8134dc08>] (__sys_recvfrom) from [<8134dd6c>] (__do_sys_recvfrom net/socket.c:2260 [inline]) [<8134dc08>] (__sys_recvfrom) from [<8134dd6c>] (sys_recvfrom+0x1c/0x24 net/socket.c:2256) r10:00000124 r9:851f0000 r8:80200288 r7:00000124 r6:0014c2d4 r5:00000000 r4:00000000 [<8134dd50>] (sys_recvfrom) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xeaed9fa8 to 0xeaed9ff0) 9fa0: 00000000 00000000 00000003 20000680 00001000 00000000 9fc0: 00000000 00000000 0014c2d4 00000124 7ee8732e 7ee8732f 003d0f00 76bfa0fc 9fe0: 76bf9f08 76bf9ef8 000167e8 00050bb0 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