8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84426003, *pmd=fba68003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 9895 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1103 [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 : [<80480f08>] lr : [<808068d4>] psr: 60000013 sp : dfcd5d20 ip : dfcd5d30 fp : dfcd5d2c r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 847e7800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85098a40 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 847e7800 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 0xdfcd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfcd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.0 (pid: 9895, stack limit = 0xdfcd4000) Stack: (0xdfcd5d20 to 0xdfcd6000) 5d20: dfcd5d64 dfcd5d30 808068d4 80480f08 dfcd5d54 dfcd5e78 8024d2c4 847e7800 5d40: 847e7800 00000000 00000000 00000000 0000003f 00000018 dfcd5db4 dfcd5d68 5d60: 81461b98 808067e8 00000000 ce36a363 84cc2600 84cc26e0 83ee1800 84cc26e8 5d80: dfcd5e78 00000000 dfcd5e0c 83ee1800 0000003f 84cc2600 85204800 20000180 5da0: 00000000 00000000 dfcd5e24 dfcd5db8 81689594 81461ab4 00000000 00000000 5dc0: 00000000 00000000 00000000 00000000 83ee1888 84cc26fc 83ee1a34 dfcd5e68 5de0: 00000000 ce36a363 821caf10 821cb998 00000000 ce36a363 dfcd5e68 81689444 5e00: dfcd5e68 84943180 00000000 20000180 00000000 00000001 dfcd5e44 dfcd5e28 5e20: 816882dc 81689450 00000000 00000000 20000180 816882a4 dfcd5e64 dfcd5e48 5e40: 813d0c5c 816882b0 dfcd5ef0 dfcd5f08 842c63c0 84943180 dfcd5ed4 dfcd5e68 5e60: 813d0d28 813d0c18 00000000 00000000 00000000 00000000 00000000 00000000 5e80: 20000180 0000003f 00000001 00000000 00000000 00000000 00000000 00000000 5ea0: dfcd5f08 00000000 00000000 00000000 80287344 ce36a363 842c63c0 0000003f 5ec0: 85204800 00000000 dfcd5f64 dfcd5ed8 80500ff4 813d0c90 dfcd5f04 dfcd5ee8 5ee0: 8020c004 8020cfec 00000000 81c35100 00000000 00000000 20000180 0000003f 5f00: 00000001 00000000 842c63c0 00000000 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 00000000 00000000 0000003f ce36a363 85204800 842c63c1 5f40: 842c63c0 20000180 0000003f 8020029c 85204800 00000003 dfcd5f94 dfcd5f68 5f60: 80501a84 80500d14 00000000 00000000 80202cac ce36a363 00000000 00000000 5f80: 001543e8 00000003 dfcd5fa4 dfcd5f98 80501ac8 805019cc 00000000 dfcd5fa8 5fa0: 80200060 80501ac4 00000000 00000000 00000006 20000180 0000003f 00000000 5fc0: 00000000 00000000 001543e8 00000003 7e8ec336 7e8ec337 003d0f00 76b1a0fc 5fe0: 76b19f08 76b19ef8 00016f30 000516d0 60000010 00000006 00000000 00000000 Call trace: [<80480efc>] (__kmap_local_page_prot) from [<808068d4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80480efc>] (__kmap_local_page_prot) from [<808068d4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<808067dc>] (copy_page_to_iter) from [<81461b98>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:0000003f r8:00000000 r7:00000000 r6:00000000 r5:847e7800 r4:847e7800 [<81461aa8>] (sk_msg_recvmsg) from [<81689594>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461aa8>] (sk_msg_recvmsg) from [<81689594>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:20000180 r7:85204800 r6:84cc2600 r5:0000003f r4:83ee1800 [<81689444>] (unix_bpf_recvmsg) from [<816882dc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:00000001 r9:00000000 r8:20000180 r7:00000000 r6:84943180 r5:dfcd5e68 r4:81689444 [<816882a4>] (unix_dgram_recvmsg) from [<813d0c5c>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<816882a4>] (unix_dgram_recvmsg) from [<813d0c5c>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:816882a4 [<813d0c0c>] (sock_recvmsg) from [<813d0d28>] (sock_read_iter+0xa4/0xfc net/socket.c:1138) r7:84943180 r6:842c63c0 r5:dfcd5f08 r4:dfcd5ef0 [<813d0c84>] (sock_read_iter) from [<80500ff4>] (new_sync_read fs/read_write.c:395 [inline]) [<813d0c84>] (sock_read_iter) from [<80500ff4>] (vfs_read+0x2ec/0x31c fs/read_write.c:476) r7:00000000 r6:85204800 r5:0000003f r4:842c63c0 [<80500d08>] (vfs_read) from [<80501a84>] (ksys_read+0xc4/0xf8 fs/read_write.c:619) r10:00000003 r9:85204800 r8:8020029c r7:0000003f r6:20000180 r5:842c63c0 r4:842c63c1 [<805019c0>] (ksys_read) from [<80501ac8>] (__do_sys_read fs/read_write.c:629 [inline]) [<805019c0>] (ksys_read) from [<80501ac8>] (sys_read+0x10/0x14 fs/read_write.c:627) r7:00000003 r6:001543e8 r5:00000000 r4:00000000 [<80501ab8>] (sys_read) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcd5fa8 to 0xdfcd5ff0) 5fa0: 00000000 00000000 00000006 20000180 0000003f 00000000 5fc0: 00000000 00000000 001543e8 00000003 7e8ec336 7e8ec337 003d0f00 76b1a0fc 5fe0: 76b19f08 76b19ef8 00016f30 000516d0 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