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access.2: Give an example of a safer alternative to using access() 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2010-10-24 09:19:24 +02:00
parent 7a35b9818e
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@ -40,7 +40,7 @@
.\" Modified 2004-06-23 by Michael Kerrisk
.\" 2007-06-10, mtk, various parts rewritten, and added BUGS section.
.\"
.TH ACCESS 2 2007-07-10 "Linux" "Linux Programmer's Manual"
.TH ACCESS 2 2010-10-24 "Linux" "Linux Programmer's Manual"
.SH NAME
access \- check real user's permissions for a file
.SH SYNOPSIS
@ -158,6 +158,10 @@ open a file before actually doing so using
creates a security hole, because the user might exploit the short time
interval between checking and opening the file to manipulate it.
.BR "For this reason, the use of this system call should be avoided" .
(In the example just described,
a safer alternative would be to temporarily switch the process's
effective user ID to the real ID and then call
.BR open (2).)
.PP
.BR access ()
returns an error if any of the access types in