/* $NetBSD: vfs_xattr.c,v 1.38.2.1 2023/03/30 11:41:07 martin Exp $ */ /*- * Copyright (c) 2005, 2008 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * VFS extended attribute support. */ #include __KERNEL_RCSID(0, "$NetBSD: vfs_xattr.c,v 1.38.2.1 2023/03/30 11:41:07 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void ktr_xattr_name(const char *str) { ktrkuser("xattr-name", (void *)__UNCONST(str), strlen(str)); } static void ktr_xattr_val(const void *data, size_t cnt) { ktruser("xattr-val", __UNCONST(data), cnt, 0); } /* * Credential check based on process requesting service, and per-attribute * permissions. * * NOTE: Vnode must be locked. */ int extattr_check_cred(struct vnode *vp, int attrspace, kauth_cred_t cred, int access) { if (cred == NOCRED) return 0; return kauth_authorize_vnode(cred, kauth_extattr_action(access), vp, NULL, genfs_can_extattr(vp, cred, access, attrspace)); } /* * Default vfs_extattrctl routine for file systems that do not support * it. */ /*ARGSUSED*/ int vfs_stdextattrctl(struct mount *mp, int cmt, struct vnode *vp, int attrnamespace, const char *attrname) { if (vp != NULL) VOP_UNLOCK(vp); return EOPNOTSUPP; } /* * Push extended attribute configuration information into the file * system. * * NOTE: Not all file systems that support extended attributes will * require the use of this system call. */ int sys_extattrctl(struct lwp *l, const struct sys_extattrctl_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) cmd; syscallarg(const char *) filename; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; } */ struct vnode *path_vp, *file_vp; struct pathbuf *file_pb; struct nameidata file_nd; char attrname[EXTATTR_MAXNAMELEN]; int error; if (SCARG(uap, attrname) != NULL) { error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; } error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &path_vp); if (error) return error; file_vp = NULL; if (SCARG(uap, filename) != NULL) { error = pathbuf_copyin(SCARG(uap, filename), &file_pb); if (error) { vrele(path_vp); return error; } NDINIT(&file_nd, LOOKUP, FOLLOW | LOCKLEAF, file_pb); error = namei(&file_nd); if (error) { pathbuf_destroy(file_pb); vrele(path_vp); return error; } file_vp = file_nd.ni_vp; pathbuf_destroy(file_pb); } error = VFS_EXTATTRCTL(path_vp->v_mount, SCARG(uap, cmd), file_vp, SCARG(uap, attrnamespace), SCARG(uap, attrname) != NULL ? attrname : NULL); if (file_vp != NULL) vrele(file_vp); vrele(path_vp); return error; } /***************************************************************************** * Internal routines to manipulate file system extended attributes: * - set * - get * - delete * - list *****************************************************************************/ /* * extattr_set_vp: * * Set a named extended attribute on a file or directory. */ static int extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname, const void *data, size_t nbytes, struct lwp *l, register_t *retval, int flag) { struct uio auio; struct iovec aiov; ssize_t cnt; int error; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (flag) { size_t attrlen; error = VOP_GETEXTATTR(vp, attrnamespace, attrname, NULL, &attrlen, l->l_cred); switch (error) { case ENODATA: case ENOATTR: if (flag & XATTR_REPLACE) goto done; break; case 0: if (flag & XATTR_CREATE) { error = EEXIST; goto done; } break; default: goto done; break; } } aiov.iov_base = __UNCONST(data); /* XXXUNCONST kills const */ aiov.iov_len = nbytes; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; if (nbytes > INT_MAX) { error = EINVAL; goto done; } auio.uio_resid = nbytes; auio.uio_rw = UIO_WRITE; KASSERT(l == curlwp); auio.uio_vmspace = l->l_proc->p_vmspace; cnt = nbytes; ktr_xattr_name(attrname); ktr_xattr_val(data, nbytes); error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, l->l_cred); cnt -= auio.uio_resid; retval[0] = cnt; done: VOP_UNLOCK(vp); return error; } /* * extattr_get_vp: * * Get a named extended attribute on a file or directory. */ static int extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname, void *data, size_t nbytes, struct lwp *l, register_t *retval) { struct uio auio, *auiop; struct iovec aiov; ssize_t cnt; size_t size, *sizep; int error; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* * Slightly unusual semantics: if the user provides a NULL data * pointer, they don't want to receive the data, just the maximum * read length. */ auiop = NULL; sizep = NULL; cnt = 0; if (data != NULL) { aiov.iov_base = data; aiov.iov_len = nbytes; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; if (nbytes > INT_MAX) { error = EINVAL; goto done; } auio.uio_resid = nbytes; auio.uio_rw = UIO_READ; KASSERT(l == curlwp); auio.uio_vmspace = l->l_proc->p_vmspace; auiop = &auio; cnt = nbytes; } else sizep = &size; ktr_xattr_name(attrname); error = VOP_GETEXTATTR(vp, attrnamespace, attrname, auiop, sizep, l->l_cred); if (auiop != NULL) { cnt -= auio.uio_resid; retval[0] = cnt; ktr_xattr_val(data, cnt); } else retval[0] = size; done: VOP_UNLOCK(vp); return error; } /* * extattr_delete_vp: * * Delete a named extended attribute on a file or directory. */ static int extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname, struct lwp *l) { int error; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); ktr_xattr_name(attrname); error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, l->l_cred); if (error == EOPNOTSUPP) error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, l->l_cred); VOP_UNLOCK(vp); return error; } /* * extattr_list_vp: * * Retrieve a list of extended attributes on a file or directory. */ static int extattr_list_vp(struct vnode *vp, int attrnamespace, void *data, size_t nbytes, int flag, struct lwp *l, register_t *retval) { struct uio auio, *auiop; size_t size, *sizep; struct iovec aiov; ssize_t cnt; int error; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); auiop = NULL; sizep = NULL; cnt = 0; if (data != NULL) { aiov.iov_base = data; aiov.iov_len = nbytes; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; if (nbytes > INT_MAX) { error = EINVAL; goto done; } auio.uio_resid = nbytes; auio.uio_rw = UIO_READ; KASSERT(l == curlwp); auio.uio_vmspace = l->l_proc->p_vmspace; auiop = &auio; cnt = nbytes; } else sizep = &size; error = VOP_LISTEXTATTR(vp, attrnamespace, auiop, sizep, flag, l->l_cred); if (auiop != NULL) { cnt -= auio.uio_resid; retval[0] = cnt; ktruser("xattr-list", data, cnt, 0); } else retval[0] = size; done: VOP_UNLOCK(vp); return error; } /***************************************************************************** * BSD API for file system extended attributes *****************************************************************************/ int sys_extattr_set_fd(struct lwp *l, const struct sys_extattr_set_fd_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; syscallarg(const void *) data; syscallarg(size_t) nbytes; } */ struct file *fp; struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) return error; vp = fp->f_vnode; error = extattr_set_vp(vp, SCARG(uap, attrnamespace), attrname, SCARG(uap, data), SCARG(uap, nbytes), l, retval, 0); fd_putfile(SCARG(uap, fd)); return error; } int sys_extattr_set_file(struct lwp *l, const struct sys_extattr_set_file_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; syscallarg(const void *) data; syscallarg(size_t) nbytes; } */ struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_set_vp(vp, SCARG(uap, attrnamespace), attrname, SCARG(uap, data), SCARG(uap, nbytes), l, retval, 0); vrele(vp); return error; } int sys_extattr_set_link(struct lwp *l, const struct sys_extattr_set_link_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; syscallarg(const void *) data; syscallarg(size_t) nbytes; } */ struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_set_vp(vp, SCARG(uap, attrnamespace), attrname, SCARG(uap, data), SCARG(uap, nbytes), l, retval, 0); vrele(vp); return error; } int sys_extattr_get_fd(struct lwp *l, const struct sys_extattr_get_fd_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; syscallarg(void *) data; syscallarg(size_t) nbytes; } */ struct file *fp; struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) return error; vp = fp->f_vnode; error = extattr_get_vp(vp, SCARG(uap, attrnamespace), attrname, SCARG(uap, data), SCARG(uap, nbytes), l, retval); fd_putfile(SCARG(uap, fd)); return error; } int sys_extattr_get_file(struct lwp *l, const struct sys_extattr_get_file_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; syscallarg(void *) data; syscallarg(size_t) nbytes; } */ struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_get_vp(vp, SCARG(uap, attrnamespace), attrname, SCARG(uap, data), SCARG(uap, nbytes), l, retval); vrele(vp); return error; } int sys_extattr_get_link(struct lwp *l, const struct sys_extattr_get_link_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; syscallarg(void *) data; syscallarg(size_t) nbytes; } */ struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_get_vp(vp, SCARG(uap, attrnamespace), attrname, SCARG(uap, data), SCARG(uap, nbytes), l, retval); vrele(vp); return error; } int sys_extattr_delete_fd(struct lwp *l, const struct sys_extattr_delete_fd_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; } */ struct file *fp; struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) return error; vp = fp->f_vnode; error = extattr_delete_vp(vp, SCARG(uap, attrnamespace), attrname, l); fd_putfile(SCARG(uap, fd)); return error; } int sys_extattr_delete_file(struct lwp *l, const struct sys_extattr_delete_file_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; } */ struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_delete_vp(vp, SCARG(uap, attrnamespace), attrname, l); vrele(vp); return error; } int sys_extattr_delete_link(struct lwp *l, const struct sys_extattr_delete_link_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(const char *) attrname; } */ struct vnode *vp; char attrname[EXTATTR_MAXNAMELEN]; int error; error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_delete_vp(vp, SCARG(uap, attrnamespace), attrname, l); vrele(vp); return error; } int sys_extattr_list_fd(struct lwp *l, const struct sys_extattr_list_fd_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) attrnamespace; syscallarg(void *) data; syscallarg(size_t) nbytes; } */ struct file *fp; struct vnode *vp; int error; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) return error; vp = fp->f_vnode; error = extattr_list_vp(vp, SCARG(uap, attrnamespace), SCARG(uap, data), SCARG(uap, nbytes), EXTATTR_LIST_LENPREFIX, l, retval); fd_putfile(SCARG(uap, fd)); return error; } int sys_extattr_list_file(struct lwp *l, const struct sys_extattr_list_file_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(void *) data; syscallarg(size_t) nbytes; } */ struct vnode *vp; int error; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_list_vp(vp, SCARG(uap, attrnamespace), SCARG(uap, data), SCARG(uap, nbytes), EXTATTR_LIST_LENPREFIX, l, retval); vrele(vp); return error; } int sys_extattr_list_link(struct lwp *l, const struct sys_extattr_list_link_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) attrnamespace; syscallarg(void *) data; syscallarg(size_t) nbytes; } */ struct vnode *vp; int error; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) return error; error = extattr_list_vp(vp, SCARG(uap, attrnamespace), SCARG(uap, data), SCARG(uap, nbytes), EXTATTR_LIST_LENPREFIX, l, retval); vrele(vp); return error; } /***************************************************************************** * Linux-compatible API for file system extended attributes *****************************************************************************/ #define MATCH_NS(ns, key) (strncmp(ns, key, sizeof(ns) - 1) == 0) static int xattr_native(const char *key) { if (MATCH_NS("system.", key)) return EXTATTR_NAMESPACE_SYSTEM; else if (MATCH_NS("user.", key)) return EXTATTR_NAMESPACE_USER; else if (MATCH_NS("security.", key)) return EXTATTR_NAMESPACE_SYSTEM; else if (MATCH_NS("trusted.", key)) return EXTATTR_NAMESPACE_SYSTEM; else return EXTATTR_NAMESPACE_USER; } #undef MATCH_NS #define XATTR_ERRNO(e) ((e) == EOPNOTSUPP ? ENOTSUP : (e)) int sys_setxattr(struct lwp *l, const struct sys_setxattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) name; syscallarg(void *) value; syscallarg(size_t) size; syscallarg(int) flags; } */ struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; register_t attrlen; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) goto out; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) goto out; attrnamespace = xattr_native(attrname); error = extattr_set_vp(vp, attrnamespace, attrname, SCARG(uap, value), SCARG(uap, size), l, &attrlen, SCARG(uap, flags)); vrele(vp); out: *retval = (error == 0 ? 0 : -1); return XATTR_ERRNO(error); } int sys_lsetxattr(struct lwp *l, const struct sys_lsetxattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) name; syscallarg(void *) value; syscallarg(size_t) size; syscallarg(int) flags; } */ struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; register_t attrlen; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) goto out; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) goto out; attrnamespace = xattr_native(attrname); error = extattr_set_vp(vp, attrnamespace, attrname, SCARG(uap, value), SCARG(uap, size), l, &attrlen, SCARG(uap, flags)); vrele(vp); out: *retval = (error == 0 ? 0 : -1); return XATTR_ERRNO(error); } int sys_fsetxattr(struct lwp *l, const struct sys_fsetxattr_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const char *) name; syscallarg(void *) value; syscallarg(size_t) size; syscallarg(int) flags; } */ struct file *fp; struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; register_t attrlen; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) goto out; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) goto out; vp = fp->f_vnode; attrnamespace = xattr_native(attrname); error = extattr_set_vp(vp, attrnamespace, attrname, SCARG(uap, value), SCARG(uap, size), l, &attrlen, SCARG(uap, flags)); fd_putfile(SCARG(uap, fd)); out: *retval = (error == 0 ? 0 : -1); return XATTR_ERRNO(error); } int sys_getxattr(struct lwp *l, const struct sys_getxattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) name; syscallarg(void *) value; syscallarg(size_t) size; } */ struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) return error; attrnamespace = xattr_native(attrname); error = extattr_get_vp(vp, attrnamespace, attrname, SCARG(uap, value), SCARG(uap, size), l, retval); vrele(vp); return XATTR_ERRNO(error); } int sys_lgetxattr(struct lwp *l, const struct sys_lgetxattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) name; syscallarg(void *) value; syscallarg(size_t) size; } */ struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) return error; attrnamespace = xattr_native(attrname); error = extattr_get_vp(vp, attrnamespace, attrname, SCARG(uap, value), SCARG(uap, size), l, retval); vrele(vp); return XATTR_ERRNO(error); } int sys_fgetxattr(struct lwp *l, const struct sys_fgetxattr_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const char *) name; syscallarg(void *) value; syscallarg(size_t) size; } */ struct file *fp; struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) return error; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) return error; vp = fp->f_vnode; attrnamespace = xattr_native(attrname); error = extattr_get_vp(vp, attrnamespace, attrname, SCARG(uap, value), SCARG(uap, size), l, retval); fd_putfile(SCARG(uap, fd)); return XATTR_ERRNO(error); } int sys_listxattr(struct lwp *l, const struct sys_listxattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(char *) list; syscallarg(size_t) size; } */ struct vnode *vp; char *list; size_t size; register_t listsize_usr, listsize_sys; int error; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) return error; list = SCARG(uap, list); size = SCARG(uap, size); error = extattr_list_vp(vp, EXTATTR_NAMESPACE_USER, list, size, 0, l, &listsize_usr); if (error) goto out; if (list) list += listsize_usr; if (size) size -= listsize_usr; error = extattr_list_vp(vp, EXTATTR_NAMESPACE_SYSTEM, list, size, 0, l, &listsize_sys); switch (error) { case EPERM: error = 0; /* Ignore and just skip system EA */ listsize_sys = 0; break; case 0: break; default: goto out; break; } *retval = listsize_usr + listsize_sys; out: vrele(vp); return XATTR_ERRNO(error); } int sys_llistxattr(struct lwp *l, const struct sys_llistxattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(char *) list; syscallarg(size_t) size; } */ struct vnode *vp; char *list; size_t size; register_t listsize_usr, listsize_sys; int error; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) return error; list = SCARG(uap, list); size = SCARG(uap, size); error = extattr_list_vp(vp, EXTATTR_NAMESPACE_USER, list, size, 0, l, &listsize_usr); if (error) goto out; if (list) list += listsize_usr; if (size) size -= listsize_usr; error = extattr_list_vp(vp, EXTATTR_NAMESPACE_SYSTEM, list, size, 0, l, &listsize_sys); switch (error) { case EPERM: error = 0; /* Ignore and just skip system EA */ listsize_sys = 0; break; case 0: break; default: goto out; break; } *retval = listsize_usr + listsize_sys; out: vrele(vp); return XATTR_ERRNO(error); } int sys_flistxattr(struct lwp *l, const struct sys_flistxattr_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(char *) list; syscallarg(size_t) size; } */ struct file *fp; struct vnode *vp; char *list; size_t size; register_t listsize_usr, listsize_sys; int error; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) return error; vp = fp->f_vnode; list = SCARG(uap, list); size = SCARG(uap, size); error = extattr_list_vp(vp, EXTATTR_NAMESPACE_USER, list, size, 0, l, &listsize_usr); if (error) goto out; if (list) list += listsize_usr; if (size) size -= listsize_usr; error = extattr_list_vp(vp, EXTATTR_NAMESPACE_SYSTEM, list, size, 0, l, &listsize_sys); switch (error) { case EPERM: error = 0; /* Ignore and just skip system EA */ listsize_sys = 0; break; case 0: break; default: goto out; break; } *retval = listsize_usr + listsize_sys; out: fd_putfile(SCARG(uap, fd)); return XATTR_ERRNO(error); } int sys_removexattr(struct lwp *l, const struct sys_removexattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) name; } */ struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT, &vp); if (error) return error; attrnamespace = xattr_native(attrname); error = extattr_delete_vp(vp, attrnamespace, attrname, l); vrele(vp); return XATTR_ERRNO(error); } int sys_lremovexattr(struct lwp *l, const struct sys_lremovexattr_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) name; } */ struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) return error; error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT, &vp); if (error) return error; attrnamespace = xattr_native(attrname); error = extattr_delete_vp(vp, attrnamespace, attrname, l); vrele(vp); return XATTR_ERRNO(error); } int sys_fremovexattr(struct lwp *l, const struct sys_fremovexattr_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const char *) name; } */ struct file *fp; struct vnode *vp; char attrname[XATTR_NAME_MAX]; int attrnamespace; int error; error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname), NULL); if (error) return error; error = fd_getvnode(SCARG(uap, fd), &fp); if (error) return error; vp = fp->f_vnode; attrnamespace = xattr_native(attrname); error = extattr_delete_vp(vp, attrnamespace, attrname, l); fd_putfile(SCARG(uap, fd)); return XATTR_ERRNO(error); }