user_namespaces.7: srcfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/user_namespaces.7

@@ -93,6 +93,9 @@ in
 Use of user namespaces requires a kernel that is configured with the
 .B CONFIG_USER_NS
 option.
+.\"
+.\" ============================================================
+.\"
 .SS Interaction of user namespaces and other types of namespaces
 Starting in Linux 3.8, unprivileged processes can create user namespaces,
 and mount, PID, IPC, network, and UTS namespaces can be created with just the
@@ -124,6 +127,9 @@ privileged operations that operate on global
 resources isolated by the namespace,
 the permission checks are performed according to the process's capabilities
 in the user namespace that the kernel associated with the new namespace.
+.\"
+.\" ============================================================
+.\"
 .SS Capabilities
 A process may have a capability either
 because that capability is present in its effective capability set,
@@ -151,6 +157,9 @@ further removed descendant user namespaces as well.
 .\" As a rough approximation, this means that
 .\" the user who creates a user namespace 
 .\" has all capabilities inside that namespace and its descendants.
+.\"
+.\" ============================================================
+.\"
 .SS User and group ID mappings: uid_map and gid_map
 The
 .IR /proc/[pid]/uid_map
@@ -228,6 +237,9 @@ that created this user namespace.
 .IP (3)
 The length of the range of user IDs that is mapped between the two
 user namespaces.
+.\"
+.\" ============================================================
+.\"
 .SS Defining user and group ID mappings: writing to uid_map and gid_map
 .PP
 After the creation of a new user namespace, the
@@ -327,6 +339,9 @@ in the parent user namespace.
 .PP
 Writes that violate the above rules fail with the error
 .BR EPERM .
+.\"
+.\" ============================================================
+.\"
 .SS Set-user-ID and set-group-ID programs
 .PP
 When a process inside a user namespace executes