8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85355003, *pmd=fec79003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 17093 Comm: syz-executor.0 Not tainted 6.8.0-rc6-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 : [<8046d124>] lr : [<807d2c68>] psr: 60000013 sp : ebbc9c00 ip : ebbc9c10 fp : ebbc9c0c r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85a15c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85183bc0 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 85a15c00 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 0xebbc8000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xebbc8000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 17093, stack limit = 0xebbc8000) Stack: (0xebbc9c00 to 0xebbca000) 9c00: ebbc9c44 ebbc9c10 807d2c68 8046d124 ebbc9c34 ebbc9ef0 8024c7e8 85a15c00 9c20: 85a15c00 00000000 00000001 00000000 0000002d 00000018 ebbc9c94 ebbc9c48 9c40: 813d93c0 807d2b7c 00000000 db65eea1 8591f000 8591f0d0 84092100 8591f0d8 9c60: ebbc9ef0 00000000 ebbc9cec 84092100 0000002d 8591f000 84130c00 00000000 9c80: 00000000 00000000 ebbc9d04 ebbc9c98 815f7c60 813d92dc 00000000 00000000 9ca0: 00000000 00000000 00000000 00000000 840921a8 8591f0ec 84092334 ebbc9ee0 9cc0: 00000000 db65eea1 03bd47ef 821907f4 00000000 db65eea1 ebbc9ee0 815f7b10 9ce0: ebbc9ee0 84832000 00000000 00000000 00000000 ebbc9d54 ebbc9d24 ebbc9d08 9d00: 815f6f84 815f7b1c 00000000 00000000 00000000 815f6f4c ebbc9d44 ebbc9d28 9d20: 8134c438 815f6f58 ebbc9ee0 84832000 20000d00 00000000 ebbc9e04 ebbc9d48 9d40: 8134c63c 8134c3f4 00000000 00000000 00000001 00000000 00000000 00000000 9d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9dc0: 00000000 00000000 00000000 00000000 00000000 db65eea1 00000000 00000000 9de0: ebbc9ee0 20000d00 00000000 84832000 84130c00 00000001 ebbc9e84 ebbc9e08 9e00: 8134f554 8134c5b8 00000000 00000000 80314db0 00000000 00000000 20000040 9e20: 0000002d 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 db65eea1 9e60: ebbc9e84 ebbc9ec0 20000d00 00000000 00000000 00000000 ebbc9f5c ebbc9e88 9e80: 8134f67c 8134f4d8 00000000 ebbc9e98 808841c8 84832000 00000001 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ec0: 00000000 00000000 00050bb0 00000000 00000000 00000000 ebbc9f04 ebbc9ee8 9ee0: ebbc9d54 00000000 00000000 00000000 00000000 00000001 20000040 0000002c 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 ebbc9f44 db65eea1 81856600 00000003 20000d00 00000000 9f40: 00000000 00000001 84130c00 0000016d ebbc9fa4 ebbc9f60 8135004c 8134f594 9f60: 00000000 ebbc9fb0 00000000 00000000 00000000 00000000 ebbc9fac db65eea1 9f80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 ebbc9fa8 9fa0: 80200060 8134ff94 00000000 00000000 00000003 20000d00 00000001 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7e99232e 7e99232f 003d0f00 76bbe0fc 9fe0: 76bbdf08 76bbdef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d118>] (__kmap_local_page_prot) from [<807d2c68>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d118>] (__kmap_local_page_prot) from [<807d2c68>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2b70>] (copy_page_to_iter) from [<813d93c0>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:0000002d r8:00000000 r7:00000001 r6:00000000 r5:85a15c00 r4:85a15c00 [<813d92d0>] (sk_msg_recvmsg) from [<815f7c60>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d92d0>] (sk_msg_recvmsg) from [<815f7c60>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84130c00 r6:8591f000 r5:0000002d r4:84092100 [<815f7b10>] (unix_bpf_recvmsg) from [<815f6f84>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2468) r10:ebbc9d54 r9:00000000 r8:00000000 r7:00000000 r6:84832000 r5:ebbc9ee0 r4:815f7b10 [<815f6f4c>] (unix_dgram_recvmsg) from [<8134c438>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f6f4c>] (unix_dgram_recvmsg) from [<8134c438>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f6f4c [<8134c3e8>] (sock_recvmsg) from [<8134c63c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000d00 r5:84832000 r4:ebbc9ee0 [<8134c5ac>] (____sys_recvmsg) from [<8134f554>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:84130c00 r8:84832000 r7:00000000 r6:20000d00 r5:ebbc9ee0 r4:00000000 [<8134f4cc>] (___sys_recvmsg) from [<8134f67c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20000d00 r4:ebbc9ec0 [<8134f588>] (do_recvmmsg) from [<8135004c>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134f588>] (do_recvmmsg) from [<8135004c>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134f588>] (do_recvmmsg) from [<8135004c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84130c00 r8:00000001 r7:00000000 r6:00000000 r5:20000d00 r4:00000003 [<8134ff88>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xebbc9fa8 to 0xebbc9ff0) 9fa0: 00000000 00000000 00000003 20000d00 00000001 00000000 9fc0: 00000000 00000000 0014c2d0 0000016d 7e99232e 7e99232f 003d0f00 76bbe0fc 9fe0: 76bbdf08 76bbdef8 000167e8 00050bb0 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