[PATCH] testbot: Sanitize the environment for system() & co.

[Francois Gouget]

system() may start a shell so make sure its behavior will not be
modified in unexpected ways by the environment ($CDPATH, $IFS) or
an external file ($ENV, $BASH_ENV).

Signed-off-by: Francois Gouget 
---

The $ENV{ENV} mystery is finally solved.

testbot/lib/WineTestBot/Config.pm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/testbot/lib/WineTestBot/Config.pm b/testbot/lib/WineTestBot/Config.pm
index 44692295..d6267dee 100644
--- a/testbot/lib/WineTestBot/Config.pm
+++ b/testbot/lib/WineTestBot/Config.pm
@@ -69,6 +69,9 @@ $LogDir = "$::RootDir/var";
 $DataDir = "$::RootDir/var";
 $BinDir = "$::RootDir/bin";

+# Sanitize the environment for system() & co
+delete @ENV{qw(IFS CDPATH ENV BASH_ENV)}; # from perlsec
+
 # See the ScheduleOnHost() documentation in lib/WineTestBot/Jobs.pm
 $MaxRevertingVMs = 1;
 $MaxRevertsWhileRunningVMs = 0;