setfsuid.2: Wording improvements

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

diff --git a/man2/setfsuid.2 b/man2/setfsuid.2
index 171b1d5da18b96e3d0cf25a0373371f63a5c7110..96508c4762d0781ba9e0afa0fa3942e85ece81c9 100644 (file)
--- a/man2/setfsuid.2
+++ b/man2/setfsuid.2
@@ -38,14 +38,15 @@ setfsuid \- set user identity used for filesystem checks
 .SH DESCRIPTION
 The system call
 .BR setfsuid ()
-sets the user ID that the Linux kernel uses to check for all accesses
+changes the value of the caller's filesystem user ID\(emthe
+user ID that the Linux kernel uses to check for all accesses
 to the filesystem.
 Normally, the value of
-.I fsuid
+the filesystem user ID
 will shadow the value of the effective user ID.
 In fact, whenever the
 effective user ID is changed,
-.I fsuid
+the filesystem user ID
 will also be changed to the new value of the effective user ID.
 
 Explicit calls to
@@ -62,9 +63,8 @@ is a security hole that can expose it to unwanted signals.
 .BR setfsuid ()
 will succeed only if the caller is the superuser or if
 .I fsuid
-matches either the real user ID, effective user ID, saved set-user-ID, or
-the current value of
-.IR fsuid .
+matches either the caller's real user ID, effective user ID,
+saved set-user-ID, or current filesystem user ID.
 .SH RETURN VALUE
 On both success and failure,
 this call returns the previous filesystem user ID of the caller.