gitk: Use mktemp -d to avoid predictable temporary directories

gitk uses a predictable ".gitk-tmp.$PID" pattern when generating
a temporary directory.

Use "mktemp -d .gitk-tmp.XXXXXX" to harden gitk against someone
seeding /tmp with files matching the pid pattern.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/gitk b/gitk
index c666435..41e5071 100755 (executable)
--- a/gitk
+++ b/gitk
@@ -3503,7 +3503,8 @@ proc gitknewtmpdir {} {
        } else {
            set tmpdir $gitdir
        }
-       set gitktmpdir [file join $tmpdir [format ".gitk-tmp.%s" [pid]]]
+       set gitktmpformat [file join $tmpdir ".gitk-tmp.XXXXXX"]
+       set gitktmpdir [exec mktemp -d $gitktmpformat]
        if {[catch {file mkdir $gitktmpdir} err]} {
            error_popup "[mc "Error creating temporary directory %s:" $gitktmpdir] $err"
            unset gitktmpdir