8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8ae84003, *pmd=fe367003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 332 Comm: syz-executor.0 Not tainted 6.6.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1086 [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:479 pc : [<804640cc>] lr : [<807da83c>] psr: 60000113 sp : dfbd1bf8 ip : dfbd1c08 fp : dfbd1c04 r10: 00000018 r9 : 828544e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8b122000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8b009680 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 8b122000 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 0xdfbd0000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xdfbd0000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process syz-executor.0 (pid: 332, stack limit = 0xdfbd0000) Stack: (0xdfbd1bf8 to 0xdfbd2000) 1be0: dfbd1c3c dfbd1c08 1c00: 807da83c 804640cc dfbd1c2c dfbd1ee8 8024bc7c 8b122000 8b122000 00000000 1c20: 00000001 00000000 000023c0 00000018 dfbd1c8c dfbd1c40 813c9a40 807da750 1c40: 40000113 848e51c0 8a016a00 8a016ad0 8982e100 8a016ad8 dfbd1ee8 00000000 1c60: dfbd1c8c 8982e100 000023c0 8a016a00 8397c680 00000001 00000000 00000000 1c80: dfbd1cfc dfbd1c90 815e3ce8 813c995c 00000000 00000002 dfbd1ca4 8a016ad0 1ca0: 8a016ac0 7fffffff 8982e1a8 8a016aec 8982e33c dfbd1ed8 00000000 8397c680 1cc0: 8029fc30 00000100 00000122 0c672351 00000000 815e3b98 dfbd1ed8 848e5180 1ce0: 00000000 20000400 00000000 dfbd1d4c dfbd1d1c dfbd1d00 815e3028 815e3ba4 1d00: 00000000 00000000 20000400 815e2ff0 dfbd1d3c dfbd1d20 81340574 815e2ffc 1d20: dfbd1ed8 848e5180 20000fc0 00000000 dfbd1dfc dfbd1d40 81340778 81340530 1d40: 00000008 20000c00 00000000 00000000 00000000 00000000 00000000 00000000 1d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1dc0: 00000000 00000000 00000000 0c672351 20000c00 00000000 dfbd1ed8 20000fc0 1de0: 00000000 848e5180 8397c680 00000002 dfbd1e7c dfbd1e00 813434b0 813406f4 1e00: 00000000 00000000 00000009 00000000 20000400 20000480 0000005b 20001700 1e20: 00001000 20000500 000000dd 20000600 00000072 20002700 00001000 20000680 1e40: 0000009f 20000740 000000a4 20000b00 000000d3 0c672351 dfbd1e7c dfbd1eb8 1e60: 20000fc0 00000000 00000000 00000000 dfbd1f5c dfbd1e80 813435d8 81343434 1e80: 00000000 dfbd1e90 80889da8 848e5180 00000001 00000000 00000000 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000001 ffffffff 1ec0: 000f4240 dfbd1ed8 dfbd1f24 000509d0 00000000 00000000 dfbd1d4c 00000000 1ee0: 00000000 00000000 00000000 00000001 00000001 dfbd1e14 000023bf 00000000 1f00: 00000008 00000000 20000c00 00000001 00000000 000000b2 00000000 00000000 1f20: 00000000 00000000 dfbd1f44 0c672351 8183cd84 00000004 20000fc0 00000000 1f40: 00000000 00000002 8397c680 0000016d dfbd1fa4 dfbd1f60 81343fa8 813434f0 1f60: 00000000 dfbd1fb0 00000000 00000000 00000000 00000000 dfbd1fac 0c672351 1f80: 8020c8d0 00000000 00000000 0014c2c8 0000016d 80200288 00000000 dfbd1fa8 1fa0: 80200060 81343ef0 00000000 00000000 00000004 20000fc0 00000002 00000000 1fc0: 00000000 00000000 0014c2c8 0000016d 7ef4e32e 7ef4e32f 003d0f00 76b870fc 1fe0: 76b86f08 76b86ef8 00016680 000509d0 60000010 00000004 00000000 00000000 Backtrace: [<804640c0>] (__kmap_local_page_prot) from [<807da83c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<804640c0>] (__kmap_local_page_prot) from [<807da83c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:479) [<807da744>] (copy_page_to_iter) from [<813c9a40>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000023c0 r8:00000000 r7:00000001 r6:00000000 r5:8b122000 r4:8b122000 [<813c9950>] (sk_msg_recvmsg) from [<815e3ce8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813c9950>] (sk_msg_recvmsg) from [<815e3ce8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:8397c680 r6:8a016a00 r5:000023c0 r4:8982e100 [<815e3b98>] (unix_bpf_recvmsg) from [<815e3028>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2457) r10:dfbd1d4c r9:00000000 r8:20000400 r7:00000000 r6:848e5180 r5:dfbd1ed8 r4:815e3b98 [<815e2ff0>] (unix_dgram_recvmsg) from [<81340574>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815e2ff0>] (unix_dgram_recvmsg) from [<81340574>] (sock_recvmsg+0x50/0x78 net/socket.c:1066) r4:815e2ff0 [<81340524>] (sock_recvmsg) from [<81340778>] (____sys_recvmsg+0x90/0x158 net/socket.c:2777) r7:00000000 r6:20000fc0 r5:848e5180 r4:dfbd1ed8 [<813406e8>] (____sys_recvmsg) from [<813434b0>] (___sys_recvmsg+0x88/0xbc net/socket.c:2819) r10:00000002 r9:8397c680 r8:848e5180 r7:00000000 r6:20000fc0 r5:dfbd1ed8 r4:00000000 [<81343428>] (___sys_recvmsg) from [<813435d8>] (do_recvmmsg+0xf4/0x298 net/socket.c:2913) r8:00000000 r7:00000000 r6:00000000 r5:20000fc0 r4:dfbd1eb8 [<813434e4>] (do_recvmmsg) from [<81343fa8>] (__sys_recvmmsg net/socket.c:2992 [inline]) [<813434e4>] (do_recvmmsg) from [<81343fa8>] (__do_sys_recvmmsg_time32 net/socket.c:3026 [inline]) [<813434e4>] (do_recvmmsg) from [<81343fa8>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3019) r10:0000016d r9:8397c680 r8:00000002 r7:00000000 r6:00000000 r5:20000fc0 r4:00000004 [<81343ee4>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfbd1fa8 to 0xdfbd1ff0) 1fa0: 00000000 00000000 00000004 20000fc0 00000002 00000000 1fc0: 00000000 00000000 0014c2c8 0000016d 7ef4e32e 7ef4e32f 003d0f00 76b870fc 1fe0: 76b86f08 76b86ef8 00016680 000509d0 r8:80200288 r7:0000016d 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