@@ -101,6 +101,9 @@ Options
Enable/disable extended attributes (xattr) on files and directories. The
default is ``no_xattr``.
+ * posix_acl|no_posix_acl -
+ Enable/disable posix acl support. Posix ACLs are disabled by default`.
+
.. option:: --socket-path=PATH
Listen on vhost-user UNIX domain socket at PATH.
@@ -183,6 +183,7 @@ void fuse_cmdline_help(void)
" to virtiofsd from guest applications.\n"
" default: no_allow_direct_io\n"
" -o announce_submounts Announce sub-mount points to the guest\n"
+ " -o posix_acl/no_posix_acl Enable/Disable posix_acl. (default: disabled)\n"
);
}
@@ -172,6 +172,7 @@ struct lo_data {
int user_killpriv_v2, killpriv_v2;
/* If set, virtiofsd is responsible for setting umask during creation */
bool change_umask;
+ int user_posix_acl;
};
static const struct fuse_opt lo_opts[] = {
@@ -204,6 +205,8 @@ static const struct fuse_opt lo_opts[] = {
{ "announce_submounts", offsetof(struct lo_data, announce_submounts), 1 },
{ "killpriv_v2", offsetof(struct lo_data, user_killpriv_v2), 1 },
{ "no_killpriv_v2", offsetof(struct lo_data, user_killpriv_v2), 0 },
+ { "posix_acl", offsetof(struct lo_data, user_posix_acl), 1 },
+ { "no_posix_acl", offsetof(struct lo_data, user_posix_acl), 0 },
FUSE_OPT_END
};
static bool use_syslog = false;
@@ -664,6 +667,21 @@ static void lo_init(void *userdata, struct fuse_conn_info *conn)
conn->want &= ~FUSE_CAP_HANDLE_KILLPRIV_V2;
lo->killpriv_v2 = 0;
}
+
+ if (lo->user_posix_acl == 1) {
+ /*
+ * User explicitly asked for this option. Enable it unconditionally.
+ * If connection does not have this capability, it should fail
+ * in fuse_lowlevel.c
+ */
+ fuse_log(FUSE_LOG_DEBUG, "lo_init: enabling posix acl\n");
+ conn->want |= FUSE_CAP_POSIX_ACL | FUSE_CAP_DONT_MASK;
+ lo->change_umask = true;
+ } else {
+ /* User either did not specify anything or wants it disabled */
+ fuse_log(FUSE_LOG_DEBUG, "lo_init: disabling posix_acl\n");
+ conn->want &= ~FUSE_CAP_POSIX_ACL;
+ }
}
static void lo_getattr(fuse_req_t req, fuse_ino_t ino,
@@ -2622,6 +2640,63 @@ static int xattr_map_server(const struct lo_data *lo, const char *server_name,
return -ENODATA;
}
+static bool block_xattr(struct lo_data *lo, const char *name)
+{
+ /*
+ * If user explicitly enabled posix_acl or did not provide any option,
+ * do not block acl. Otherwise block system.posix_acl_access and
+ * system.posix_acl_default xattrs.
+ */
+ if (lo->user_posix_acl) {
+ return false;
+ }
+ if (!strcmp(name, "system.posix_acl_access") ||
+ !strcmp(name, "system.posix_acl_default"))
+ return true;
+
+ return false;
+}
+
+/*
+ * Returns number of bytes in xattr_list after filtering on success. This
+ * could be zero as well if nothing is left after filtering.
+ *
+ * Returns negative error code on failure.
+ * xattr_list is modified in place.
+ */
+static int remove_blocked_xattrs(struct lo_data *lo, char *xattr_list,
+ unsigned in_size)
+{
+ size_t out_index, in_index;
+
+ /*
+ * As of now we only filter out acl xattrs. If acls are enabled or
+ * they have not been explicitly disabled, there is nothing to
+ * filter.
+ */
+ if (lo->user_posix_acl) {
+ return in_size;
+ }
+
+ out_index = 0;
+ in_index = 0;
+ while (in_index < in_size) {
+ char *in_ptr = xattr_list + in_index;
+
+ /* Length of current attribute name */
+ size_t in_len = strlen(xattr_list + in_index) + 1;
+
+ if (!block_xattr(lo, in_ptr)) {
+ if (in_index != out_index) {
+ memmove(xattr_list + out_index, xattr_list + in_index, in_len);
+ }
+ out_index += in_len;
+ }
+ in_index += in_len;
+ }
+ return out_index;
+}
+
static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name,
size_t size)
{
@@ -2635,6 +2710,11 @@ static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name,
int saverr;
int fd = -1;
+ if (block_xattr(lo, in_name)) {
+ fuse_reply_err(req, EOPNOTSUPP);
+ return;
+ }
+
mapped_name = NULL;
name = in_name;
if (lo->xattrmap) {
@@ -2776,7 +2856,6 @@ static void lo_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size)
if (ret == 0) {
goto out;
}
-
if (lo->xattr_map_list) {
/*
* Map the names back, some attributes might be dropped,
@@ -2823,6 +2902,12 @@ static void lo_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size)
goto out;
}
}
+
+ ret = remove_blocked_xattrs(lo, value, ret);
+ if (ret <= 0) {
+ saverr = -ret;
+ goto out;
+ }
fuse_reply_buf(req, value, ret);
} else {
/*
@@ -2861,6 +2946,11 @@ static void lo_setxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name,
int saverr;
int fd = -1;
+ if (block_xattr(lo, in_name)) {
+ fuse_reply_err(req, EOPNOTSUPP);
+ return;
+ }
+
mapped_name = NULL;
name = in_name;
if (lo->xattrmap) {
@@ -2927,6 +3017,11 @@ static void lo_removexattr(fuse_req_t req, fuse_ino_t ino, const char *in_name)
int saverr;
int fd = -1;
+ if (block_xattr(lo, in_name)) {
+ fuse_reply_err(req, EOPNOTSUPP);
+ return;
+ }
+
mapped_name = NULL;
name = in_name;
if (lo->xattrmap) {
@@ -3614,6 +3709,7 @@ int main(int argc, char *argv[])
.allow_direct_io = 0,
.proc_self_fd = -1,
.user_killpriv_v2 = -1,
+ .user_posix_acl = -1,
};
struct lo_map_elem *root_elem;
struct lo_map_elem *reserve_elem;
@@ -3740,6 +3836,11 @@ int main(int argc, char *argv[])
exit(1);
}
+ if (lo.user_posix_acl == 1 && !lo.xattr) {
+ fuse_log(FUSE_LOG_ERR, "Can't enable posix ACLs. xattrs are disabled.\n");
+ exit(1);
+ }
+
lo.use_statx = true;
se = fuse_session_new(&args, &lo_oper, sizeof(lo_oper), &lo);
fuse has an option FUSE_POSIX_ACL which needs to be opted in by fuse server to enable posix acls. As of now we are not opting in for this, so posix acls are disabled on virtiofs by default. Add virtiofsd option "-o posix_acl/no_posix_acl" to let users enable/disable posix acl support. By default it is disabled as of now due to performance concerns with cache=none. Currently even if file server has not opted in for FUSE_POSIX_ACL, user can still query acl and set acl, and system.posix_acl_access and system.posix_acl_default xattrs show up listxattr response. Miklos said this is confusing. So he said lets block and filter system.posix_acl_access and system.posix_acl_default xattrs in getxattr/setxattr/listxattr if user has explicitly disabled posix acls using -o no_posix_acl. As of now continuing to keeping the existing behavior if user did not specify any option to disable acl support due to concerns about backward compatibility. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> --- docs/tools/virtiofsd.rst | 3 + tools/virtiofsd/helper.c | 1 + tools/virtiofsd/passthrough_ll.c | 103 ++++++++++++++++++++++++++++++- 3 files changed, 106 insertions(+), 1 deletion(-)