- Fix arbitrary cvar overwrite flaw: http://aluigi.altervista.org/adv.htm

- Add myself to maintainer list :)

code/qcommon/cvar.c

@@ -161,6 +161,20 @@ void Cvar_VariableStringBuffer( const char *var_name, char *buffer, int bufsize
 	}
 }
 
+/*
+============
+Cvar_Flags
+============
+*/
+int Cvar_Flags(const char *var_name)
+{
+	cvar_t *var;
+	
+	if(! (var = Cvar_FindVar(var_name)) )
+		return CVAR_NONEXISTENT;
+	else
+		return var->flags;
+}
 
 /*
 ============

code/qcommon/files.c

@@ -2568,6 +2568,23 @@ qboolean FS_idPak( char *pak, char *base ) {
 	return qfalse;
 }
 
+/*
+================
+FS_idPak
+
+Check whether the string contains stuff like "../" to prevent directory traversal bugs
+and return qtrue if it does.
+================
+*/
+
+qboolean FS_CheckDirTraversal(const char *checkdir)
+{
+	if(strstr(checkdir, "../") || strstr(checkdir, "..\\"))
+		return qtrue;
+	
+	return qfalse;
+}
+
 /*
 ================
 FS_ComparePaks
@@ -2617,7 +2634,7 @@ qboolean FS_ComparePaks( char *neededpaks, int len, qboolean dlstring ) {
 		}
 
 		// Make sure the server cannot make us write to non-quake3 directories.
-		if(strstr(fs_serverReferencedPakNames[i], "../") || strstr(fs_serverReferencedPakNames[i], "..\\"))
+		if(FS_CheckDirTraversal(fs_serverReferencedPakNames[i]))
                 {
 			Com_Printf("WARNING: Invalid download name %s\n", fs_serverReferencedPakNames[i]);
                         continue;

code/qcommon/q_shared.h

@@ -756,6 +756,9 @@ default values.
 #define CVAR_CHEAT			512	// can not be changed if cheats are disabled
 #define CVAR_NORESTART		1024	// do not clear when a cvar_restart is issued
 
+#define CVAR_SERVER_CREATED	2048	// cvar was created by a server the client connected to.
+#define CVAR_NONEXISTENT	0xFFFFFFFF	// Cvar doesn't exist.
+
 // nothing outside the Cvar_*() functions should modify these fields!
 typedef struct cvar_s {
 	char		*name;

code/qcommon/qcommon.h

@@ -480,6 +480,9 @@ char	*Cvar_VariableString( const char *var_name );
 void	Cvar_VariableStringBuffer( const char *var_name, char *buffer, int bufsize );
 // returns an empty string if not defined
 
+int	Cvar_Flags(const char *var_name);
+// returns CVAR_NONEXISTENT if cvar doesn't exist or the flags of that particular CVAR.
+
 void	Cvar_CommandCompletion( void(*callback)(const char *s) );
 // callback with each valid string
 
@@ -648,6 +651,7 @@ void FS_PureServerSetLoadedPaks( const char *pakSums, const char *pakNames );
 // separated checksums will be checked for files, with the
 // sole exception of .cfg files.
 
+qboolean FS_CheckDirTraversal(const char *checkdir);
 qboolean FS_idPak( char *pak, char *base );
 qboolean FS_ComparePaks( char *neededpaks, int len, qboolean dlstring );