| 1673 | } |
| 1674 | |
| 1675 | int |
| 1676 | kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2, |
| 1677 | enum uio_seg segflg) |
| 1678 | { |
| 1679 | struct mount *mp; |
| 1680 | struct vattr vattr; |
| 1681 | const char *syspath; |
| 1682 | char *tmppath; |
| 1683 | struct nameidata nd; |
| 1684 | int error; |
| 1685 | |
| 1686 | if (segflg == UIO_SYSSPACE) { |
| 1687 | syspath = path1; |
| 1688 | } else { |
| 1689 | tmppath = uma_zalloc(namei_zone, M_WAITOK); |
| 1690 | if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0) |
| 1691 | goto out; |
| 1692 | syspath = tmppath; |
| 1693 | } |
| 1694 | AUDIT_ARG_TEXT(syspath); |
| 1695 | restart: |
| 1696 | bwillwrite(); |
| 1697 | NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | |
| 1698 | NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, |
| 1699 | td); |
| 1700 | if ((error = namei(&nd)) != 0) |
| 1701 | goto out; |
| 1702 | if (nd.ni_vp) { |
| 1703 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1704 | if (nd.ni_vp == nd.ni_dvp) |
| 1705 | vrele(nd.ni_dvp); |
| 1706 | else |
| 1707 | vput(nd.ni_dvp); |
| 1708 | vrele(nd.ni_vp); |
| 1709 | nd.ni_vp = NULL; |
| 1710 | error = EEXIST; |
| 1711 | goto out; |
| 1712 | } |
| 1713 | if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { |
| 1714 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1715 | vput(nd.ni_dvp); |
| 1716 | if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) |
| 1717 | goto out; |
| 1718 | goto restart; |
| 1719 | } |
| 1720 | VATTR_NULL(&vattr); |
| 1721 | vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask; |
| 1722 | #ifdef MAC |
| 1723 | vattr.va_type = VLNK; |
| 1724 | error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, |
| 1725 | &vattr); |
| 1726 | if (error != 0) |
| 1727 | goto out2; |
| 1728 | #endif |
| 1729 | error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); |
| 1730 | #ifdef MAC |
| 1731 | out2: |
| 1732 | #endif |
no test coverage detected