8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85a05003, *pmd=fec4b003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 11480 Comm: syz-executor.1 Not tainted 6.8.0-rc3-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 : [<8046d074>] lr : [<807d2848>] psr: 60000013 sp : e0059ca0 ip : e0059cb0 fp : e0059cac r10: 00000018 r9 : 8284f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85298c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 851ece40 DAC: fffffffd 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 85298c00 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 0xe0058000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xe0058000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 11480, stack limit = 0xe0058000) Stack: (0xe0059ca0 to 0xe005a000) 9ca0: e0059ce4 e0059cb0 807d2848 8046d074 e0059cd4 e0059f48 8024c824 85298c00 9cc0: 85298c00 00000000 00000000 00000000 0000006d 00000018 e0059d34 e0059ce8 9ce0: 813d805c 807d275c 00000000 8bf97670 8512a600 8512a6d0 83cacf00 8512a6d8 9d00: e0059f48 00000000 e0059d8c 83cacf00 0000006d 8512a600 84176000 00000000 9d20: 00000000 00000000 e0059da4 e0059d38 815f63b0 813d7f78 00000000 00000000 9d40: 00000000 00000000 00000000 00000000 83cacfa8 8512a6ec 83cad134 e0059f38 9d60: 00000000 8bf97670 81857470 821907f4 00000000 8bf97670 e0059f38 815f6260 9d80: e0059f38 8482cf00 00000000 00000000 00000000 e0059df4 e0059dc4 e0059da8 9da0: 815f56f0 815f626c 00000000 00000000 00000000 815f56b8 e0059de4 e0059dc8 9dc0: 8134b118 815f56c4 e0059f38 8482cf00 20000800 00000000 e0059ea4 e0059de8 9de0: 8134b31c 8134b0d4 00000000 00000000 00000001 00000000 00000000 00000000 9e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e60: 00000000 00000000 00000000 00000000 00000000 8bf97670 00000000 00000000 9e80: e0059f38 20000800 00000000 8482cf00 84176000 00000129 e0059f24 e0059ea8 9ea0: 8134e234 8134b298 00000000 00000000 00000008 00000000 00000000 20000700 9ec0: 0000006d 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8bf97670 9f00: e0059f24 8482cf00 00000000 20000800 00000000 80200288 e0059fa4 e0059f28 9f20: 8134e9ec 8134e1b8 00000000 e0059f38 00000001 fffffff7 e0059df4 00000000 9f40: 00000000 00000000 00000000 00000000 20000700 0000006d 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020ca34 8bf97670 00000000 00000000 0014c2c8 00000129 00000000 e0059fa8 9fa0: 80200060 8134e984 00000000 00000000 00000003 20000800 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7ee0332e 7ee0332f 003d0f00 76bee0fc 9fe0: 76bedf08 76bedef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d068>] (__kmap_local_page_prot) from [<807d2848>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d068>] (__kmap_local_page_prot) from [<807d2848>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2750>] (copy_page_to_iter) from [<813d805c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:0000006d r8:00000000 r7:00000000 r6:00000000 r5:85298c00 r4:85298c00 [<813d7f6c>] (sk_msg_recvmsg) from [<815f63b0>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d7f6c>] (sk_msg_recvmsg) from [<815f63b0>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84176000 r6:8512a600 r5:0000006d r4:83cacf00 [<815f6260>] (unix_bpf_recvmsg) from [<815f56f0>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2481) r10:e0059df4 r9:00000000 r8:00000000 r7:00000000 r6:8482cf00 r5:e0059f38 r4:815f6260 [<815f56b8>] (unix_dgram_recvmsg) from [<8134b118>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f56b8>] (unix_dgram_recvmsg) from [<8134b118>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f56b8 [<8134b0c8>] (sock_recvmsg) from [<8134b31c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000800 r5:8482cf00 r4:e0059f38 [<8134b28c>] (____sys_recvmsg) from [<8134e234>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:84176000 r8:8482cf00 r7:00000000 r6:20000800 r5:e0059f38 r4:00000000 [<8134e1ac>] (___sys_recvmsg) from [<8134e9ec>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8134e1ac>] (___sys_recvmsg) from [<8134e9ec>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8134e1ac>] (___sys_recvmsg) from [<8134e9ec>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20000800 r5:00000000 r4:8482cf00 [<8134e978>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe0059fa8 to 0xe0059ff0) 9fa0: 00000000 00000000 00000003 20000800 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7ee0332e 7ee0332f 003d0f00 76bee0fc 9fe0: 76bedf08 76bedef8 000167e8 00050bb0 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