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bh=qhGt35mHUuzt86T3Gdeo7KocdI0utkzrJK/Zh2sbGu4=; b=E2xGvbR0iQOlqPX4Gh9xG2L7WDhdaDH3tM1MRyhuCZ1iyIDEWihoD//lzdzPSFp+RvogqU F57vT1+elTtKDREo2d1u4qKDbuPUYLR+7GQ6UdWxmr9kXARoCibQcohKu731HTpj2SmNFX ir5wQ11CNdWHN1L5QFtDhRn4Qxi894E= X-MC-Unique: 8rz8DJ1GPO2Thk1qdzs5zA-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, vgoyal@redhat.com, stefanha@redhat.com, virtio-fs@redhat.com Subject: [PATCH v2 5/6] tools/virtiofsd: xattr name mappings: Map server xattr names Date: Thu, 27 Aug 2020 16:36:56 +0100 Message-Id: <20200827153657.111098-6-dgilbert@redhat.com> In-Reply-To: <20200827153657.111098-1-dgilbert@redhat.com> References: <20200827153657.111098-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: "Dr. David Alan Gilbert" Map xattr names coming from the server, i.e. the host filesystem; currently this is only from listxattr. Signed-off-by: Dr. David Alan Gilbert --- tools/virtiofsd/passthrough_ll.c | 88 ++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index 9b9c8f3ab1..7cd99186f7 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -2188,6 +2188,42 @@ static int xattr_map_client(const char *client_name,= char **out_name) abort(); } =20 +/* + * For use with listxattr where the server fs gives us a name and we may n= eed + * to sanitize this for the client. + * Returns a pointer to the result in *out_name + * This is always the original string or the current string with some pr= efix + * removed; no reallocation is done. + * Returns 0 on success + * Can return -ENODATA to indicate the name should be dropped from the lis= t. + */ +static int xattr_map_server(const char *server_name, const char **out_name) +{ + const XattrMapEntry *cur_entry; + for (cur_entry =3D xattr_map_list; ; cur_entry++) { + if ((cur_entry->flags & XATTR_MAP_FLAG_SERVER) && + (!strncmp(cur_entry->prepend, + server_name, + strlen(cur_entry->prepend)))) { + if (cur_entry->flags & XATTR_MAP_FLAG_END_BAD) { + return -ENODATA; + } + if (cur_entry->flags & XATTR_MAP_FLAG_END_OK) { + *out_name =3D server_name; + return 0; + } + if (cur_entry->flags & XATTR_MAP_FLAG_PREFIX) { + /* Remove prefix */ + *out_name =3D server_name + strlen(cur_entry->prepend); + return 0; + } + } + } + + /* Shouldn't get here - rules should have an END_* */ + abort(); +} + static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *in_nam= e, size_t size) { @@ -2342,8 +2378,60 @@ static void lo_listxattr(fuse_req_t req, fuse_ino_t = ino, size_t size) if (ret =3D=3D 0) { goto out; } + + if (lo->xattrmap) { + /* + * Map the names back, some attributes might be dropped, + * some shortened, but not increased, so we shouldn't + * run out of room. + */ + size_t out_index, in_index; + out_index =3D 0; + in_index =3D 0; + while (in_index < ret) { + const char *map_out; + char *in_ptr =3D value + in_index; + /* Length of current attribute name */ + size_t in_len =3D strlen(value + in_index) + 1; + + int mapret =3D xattr_map_server(in_ptr, &map_out); + if (mapret !=3D -ENODATA && mapret !=3D 0) { + /* Shouldn't happen */ + saverr =3D -mapret; + goto out; + } + if (mapret =3D=3D 0) { + /* Either unchanged, or truncated */ + size_t out_len; + if (map_out !=3D in_ptr) { + /* +1 copies the NIL */ + out_len =3D strlen(map_out) + 1; + } else { + /* No change */ + out_len =3D in_len; + } + /* + * Move result along, may still be needed for an uncha= nged + * entry if a previous entry was changed. + */ + memmove(value + out_index, map_out, out_len); + + out_index +=3D out_len; + } + in_index +=3D in_len; + } + ret =3D out_index; + if (ret =3D=3D 0) { + goto out; + } + } fuse_reply_buf(req, value, ret); } else { + /* + * xattrmap only ever shortens the result, + * so we don't need to do anything clever with the + * allocation length here. + */ fuse_reply_xattr(req, ret); } out_free: --=20 2.26.2