/*===========================================================================*
* do_unlink *
*===========================================================================*/
int do_unlink()
{
/* Perform the unlink(name) or rmdir(name) system call. The code for these two
* is almost the same. They differ only in some condition testing. Unlink()
* may be used by the superuser to do dangerous things; rmdir() may not.
*/
register struct fproc *rfp;
struct vnode *vldirp, *vp;
int r;
/* Get the last directory in the path. */
if (fetch_name(user_fullpath, PATH_MAX, m_in.name) < 0) return(err_code);
if ((vldirp = last_dir()) == NIL_VNODE) return(err_code);
/* Make sure that the object is a directory */
if((vldirp->v_mode & I_TYPE) != I_DIRECTORY) {
put_vnode(vldirp);
return(-ENOTDIR);
}
/* The caller must have both search and execute permission */
if ((r = forbidden(vldirp, X_BIT | W_BIT)) != 0) {
put_vnode(vldirp);
return(r);
}
/* Also, if the sticky bit is set, only the owner of the file or a privileged
user is allowed to unlink */
if ((vldirp->v_mode & S_ISVTX) == S_ISVTX) {
/* Look up inode of file to unlink to retrieve owner */
vp = advance(vldirp, PATH_RET_SYMLINK);
if (vp != NIL_VNODE) {
if(vp->v_uid != fp->fp_effuid && fp->fp_effuid != SU_UID)
r = -EPERM;
put_vnode(vp);
} else
r = err_code;
if (r != 0) {
put_vnode(vldirp);
return(r);
}
}
if(call_nr == __NR_unlink)
r = req_unlink(vldirp->v_fs_e, vldirp->v_inode_nr, user_fullpath);
else
r = req_rmdir(vldirp->v_fs_e, vldirp->v_inode_nr, user_fullpath);
put_vnode(vldirp);
return(r);
}
/*===========================================================================*
* do_unlink *
*===========================================================================*/
int do_unlink()
{
/* Perform the unlink(name) or rmdir(name) system call. The code for these two
* is almost the same. They differ only in some condition testing. Unlink()
* may be used by the superuser to do dangerous things; rmdir() may not.
* The syscall might provide 'name' embedded in the message.
*/
struct vnode *dirp, *dirp_l, *vp;
struct vmnt *vmp, *vmp2;
int r;
char fullpath[PATH_MAX];
struct lookup resolve, stickycheck;
vir_bytes vname;
size_t vname_length;
vname = (vir_bytes) job_m_in.name;
vname_length = job_m_in.name_length;
if (copy_name(vname_length, fullpath) != OK) {
/* Direct copy failed, try fetching from user space */
if (fetch_name(vname, vname_length, fullpath) != OK)
/* CSC2025 Mod Start */
logfserr_nopath(FSOP_UNLNK, err_code);
/* CSC2025 Mod End */
return(err_code);
}
lookup_init(&resolve, fullpath, PATH_RET_SYMLINK, &vmp, &dirp_l);
resolve.l_vmnt_lock = VMNT_WRITE;
resolve.l_vnode_lock = VNODE_WRITE;
/* Get the last directory in the path. */
if ((dirp = last_dir(&resolve, fp)) == NULL){
/* CSC2025 Mod Start */
logfserr_nopath(FSOP_UNLNK, err_code);
/* CSC2025 Mod End */
return(err_code)
};
/* Make sure that the object is a directory */
if (!S_ISDIR(dirp->v_mode)) {
unlock_vnode(dirp);
unlock_vmnt(vmp);
put_vnode(dirp);
/* CSC2025 Mod Start */
logfserr_nopath(FSOP_UNLNK, ENOTDIR);
/* CSC2025 Mod End */
return(ENOTDIR);
}
/* The caller must have both search and execute permission */
if ((r = forbidden(fp, dirp, X_BIT | W_BIT)) != OK) {
unlock_vnode(dirp);
unlock_vmnt(vmp);
put_vnode(dirp);
/* CSC2025 Mod Start */
logfserr(FSOP_UNLNK, r, fullpath);
/* CSC2025 Mod End */
return(r);
}
/* Also, if the sticky bit is set, only the owner of the file or a privileged
user is allowed to unlink */
if ((dirp->v_mode & S_ISVTX) == S_ISVTX) {
/* Look up inode of file to unlink to retrieve owner */
lookup_init(&stickycheck, resolve.l_path, PATH_RET_SYMLINK, &vmp2, &vp);
stickycheck.l_vmnt_lock = VMNT_READ;
stickycheck.l_vnode_lock = VNODE_READ;
vp = advance(dirp, &stickycheck, fp);
assert(vmp2 == NULL);
if (vp != NULL) {
if (vp->v_uid != fp->fp_effuid && fp->fp_effuid != SU_UID)
r = EPERM;
unlock_vnode(vp);
put_vnode(vp);
} else
r = err_code;
if (r != OK) {
unlock_vnode(dirp);
unlock_vmnt(vmp);
put_vnode(dirp);
/* CSC2025 Mod Start */
logfserr(FSOP_UNLNK, r, fullpath);
/* CSC2025 Mod End */
return(r);
}
}
upgrade_vmnt_lock(vmp);
if (job_call_nr == UNLINK)
r = req_unlink(dirp->v_fs_e, dirp->v_inode_nr, fullpath);
else
r = req_rmdir(dirp->v_fs_e, dirp->v_inode_nr, fullpath);
unlock_vnode(dirp);
unlock_vmnt(vmp);
put_vnode(dirp);
/* CSC2025 Mod Start */
if(r == OK){
logfsop(FSOP_UNLNK, r, fullpath, scratch(fp).file.fd_nr, vp->v_mode, vp->v_uid, vp->v_gid, vp->v_size};
} else {
