audit: type=1400 audit(1520533139.012:8): avc: denied { map } for pid=4238 comm="syz-execprog" path="/root/syzkaller-shm000733840" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: stack-out-of-bounds in rdma_bind_addr+0x156/0x1b50 drivers/infiniband/core/cma.c:3359 Read of size 48 at addr ffff8801d2837a00 by task syz-executor0/4246 CPU: 1 PID: 4246 Comm: syz-executor0 Not tainted 4.16.0-rc4+ #256 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x137/0x190 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:345 [inline] rdma_bind_addr+0x156/0x1b50 drivers/infiniband/core/cma.c:3359 ucma_bind_ip+0x10a/0x190 drivers/infiniband/core/ucma.c:633 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1627 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f38c99 RSP: 002b:00000000ffd8b85c EFLAGS: 00000286 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000bc0 RDX: 0000000000000024 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea00074a0dc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 ffffea00074a0de0 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d2837900: f1 f1 f1 f1 04 f2 f2 f2 f2 f2 f2 f2 04 f2 f2 f2 ffff8801d2837980: f3 f3 f3 f3 00 00 00 00 00 00 00 f1 f1 f1 f1 00 >ffff8801d2837a00: 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00 00 00 ^ ffff8801d2837a80: 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f3 f3 f3 ffff8801d2837b00: f3 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 ==================================================================