8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85279003, *pmd=fed70003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 7719 Comm: syz-executor.0 Not tainted 6.9.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [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:360 pc : [<80479e00>] lr : [<807eb304>] psr: 60000013 sp : ed1b9ca0 ip : ed1b9cb0 fp : ed1b9cac r10: 00000018 r9 : 828584e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84682c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84e8c500 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 84682c00 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 0xed1b8000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xed1b8000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.0 (pid: 7719, stack limit = 0xed1b8000) Stack: (0xed1b9ca0 to 0xed1ba000) 9ca0: ed1b9ce4 ed1b9cb0 807eb304 80479e00 ed1b9cd4 ed1b9f48 8024c880 84682c00 9cc0: 84682c00 00000000 00000000 00000000 000000b5 00000018 ed1b9d34 ed1b9ce8 9ce0: 8140bd2c 807eb218 40000013 84840540 84773a00 84773ad0 8468e400 84773ad8 9d00: ed1b9f48 00000000 ed1b9d34 8468e400 000000b5 84773a00 84162400 00000001 9d20: 00000000 00000000 ed1b9da4 ed1b9d38 8162e758 8140bc48 00000000 00000000 9d40: 00000000 84773ad0 84773ac0 7fffffff 8468e488 84773aec 8468e634 ed1b9f38 9d60: 00000000 84162400 802a2fcc 00000100 00000122 b3cc3593 ed1b9f38 8162e608 9d80: ed1b9f38 84840500 00000000 20000180 00000000 ed1b9df4 ed1b9dc4 ed1b9da8 9da0: 8162d7f4 8162e614 00000000 00000000 20000180 8162d7bc ed1b9de4 ed1b9dc8 9dc0: 8137b318 8162d7c8 ed1b9f38 84840500 200004c0 00000000 ed1b9ea4 ed1b9de8 9de0: 8137b518 8137b2d4 00000003 00000000 00000000 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 b3cc3593 00000000 00000000 9e80: ed1b9f38 200004c0 00000000 84840500 84162400 00000129 ed1b9f24 ed1b9ea8 9ea0: 8137e45c 8137b494 00000000 00000000 00000008 00000000 20000180 00000000 9ec0: 00000000 00000000 00000002 200006c0 000000b3 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 b3cc3593 9f00: ed1b9f24 84840500 00000000 200004c0 00000000 80200288 ed1b9fa4 ed1b9f28 9f20: 8137ebd8 8137e3e0 00000000 ed1b9f38 00000001 fffffff7 ed1b9df4 00000000 9f40: 00000000 00000000 00000001 00000000 ed1b9ebc 000000b5 00000003 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020ca6c b3cc3593 00000000 00000000 0014c2c8 00000129 00000000 ed1b9fa8 9fa0: 80200060 8137eb70 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7eed932e 7eed932f 003d0f00 76bb70fc 9fe0: 76bb6f08 76bb6ef8 000167f8 00050bc0 60000010 00000003 00000000 00000000 Call trace: [<80479df4>] (__kmap_local_page_prot) from [<807eb304>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479df4>] (__kmap_local_page_prot) from [<807eb304>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807eb20c>] (copy_page_to_iter) from [<8140bd2c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000b5 r8:00000000 r7:00000000 r6:00000000 r5:84682c00 r4:84682c00 [<8140bc3c>] (sk_msg_recvmsg) from [<8162e758>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8140bc3c>] (sk_msg_recvmsg) from [<8162e758>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:84162400 r6:84773a00 r5:000000b5 r4:8468e400 [<8162e608>] (unix_bpf_recvmsg) from [<8162d7f4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:ed1b9df4 r9:00000000 r8:20000180 r7:00000000 r6:84840500 r5:ed1b9f38 r4:8162e608 [<8162d7bc>] (unix_dgram_recvmsg) from [<8137b318>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8162d7bc>] (unix_dgram_recvmsg) from [<8137b318>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:8162d7bc [<8137b2c8>] (sock_recvmsg) from [<8137b518>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:84840500 r4:ed1b9f38 [<8137b488>] (____sys_recvmsg) from [<8137e45c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:84162400 r8:84840500 r7:00000000 r6:200004c0 r5:ed1b9f38 r4:00000000 [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:200004c0 r5:00000000 r4:84840500 [<8137eb64>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xed1b9fa8 to 0xed1b9ff0) 9fa0: 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7eed932e 7eed932f 003d0f00 76bb70fc 9fe0: 76bb6f08 76bb6ef8 000167f8 00050bc0 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