On Fri, Jan 8, 2016 at 4:55 PM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > Hello, > > The following program triggers WARNING in __x86_set_memory_region: > > // autogenerated by syzkaller (http://github.com/google/syzkaller) > #include <unistd.h> > #include <sys/syscall.h> > #include <string.h> > #include <stdint.h> > > long r[8]; > > int main() > { > memset(r, -1, sizeof(r)); > r[0] = syscall(SYS_mmap, 0x20000000ul, 0x1000ul, 0x3ul, > 0x32ul, 0xfffffffffffffffful, 0x0ul); > memcpy((void*)0x20000000, "\x2f\x64\x65\x76\x2f\x6b\x76\x6d", 8); > r[2] = syscall(SYS_open, 0x20000000ul, 0x200ul, 0x0ul, 0, 0, 0); > r[3] = syscall(SYS_ioctl, r[2], 0xae01ul, 0x0ul, 0, 0, 0); > *(uint64_t*)0x20000000 = (uint64_t)0x440; > r[5] = syscall(SYS_ioctl, r[3], 0xae47ul, 0x20000000ul, 0, 0, 0); > *(uint64_t*)0x20000000 = (uint64_t)0x1; > r[7] = syscall(SYS_ioctl, r[3], 0xae47ul, 0x20000000ul, 0, 0, 0); > return 0; > } > > ------------[ cut here ]------------ > WARNING: CPU: 3 PID: 7265 at arch/x86/kvm/x86.c:7703 > __x86_set_memory_region+0x4b9/0x500() > Modules linked in: > CPU: 3 PID: 7265 Comm: syz-executor Tainted: G W 4.4.0-rc8+ #211 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > 00000000ffffffff ffff8800351d7720 ffffffff82907ccd 0000000000000000 > ffff880033f81780 ffffffff85ed4540 ffff8800351d7760 ffffffff8133f979 > ffffffff8103d8a9 ffffffff85ed4540 0000000000001e17 00000000000001fd > Call Trace: > [< inline >] __dump_stack lib/dump_stack.c:15 > [<ffffffff82907ccd>] dump_stack+0x6f/0xa2 lib/dump_stack.c:50 > [<ffffffff8133f979>] warn_slowpath_common+0xd9/0x140 kernel/panic.c:460 > [<ffffffff8133fba9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:493 > [<ffffffff8103d8a9>] __x86_set_memory_region+0x4b9/0x500 > arch/x86/kvm/x86.c:7703 > [<ffffffff8103d92e>] x86_set_memory_region+0x3e/0x60 arch/x86/kvm/x86.c:7749 > [<ffffffff810fc0f9>] vmx_set_tss_addr+0x79/0x2a0 arch/x86/kvm/vmx.c:5101 > [< inline >] kvm_vm_ioctl_set_tss_addr arch/x86/kvm/x86.c:3477 > [<ffffffff8105a90b>] kvm_arch_vm_ioctl+0xecb/0x1db0 arch/x86/kvm/x86.c:3744 > [<ffffffff8101ff4c>] kvm_vm_ioctl+0x17c/0xf30 > arch/x86/kvm/../../../virt/kvm/kvm_main.c:2902 > [< inline >] vfs_ioctl fs/ioctl.c:43 > [<ffffffff817b66f1>] do_vfs_ioctl+0x681/0xe40 fs/ioctl.c:607 > [< inline >] SYSC_ioctl fs/ioctl.c:622 > [<ffffffff817b6f3f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613 > [<ffffffff85e77af6>] entry_SYSCALL_64_fastpath+0x16/0x7a > arch/x86/entry/entry_64.S:185 > ---[ end trace 6d1cb7e02f836554 ]--- > > On commit b06f3a168cdcd80026276898fd1fee443ef25743 (Jan 6). + more kvm people -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
