From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 23 Apr 2015 22:48:43 +0000 (-0400)
Subject: Fix: add missing getenv wrapper
X-Git-Tag: v2.5.4~2
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=f40806c899f23f6006f38c55438ef8c5b7e69b9c;p=lttng-ust.git

Fix: add missing getenv wrapper

Required for old glibc.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/liblttng-ust/Makefile.am b/liblttng-ust/Makefile.am
index e2e1baaa..10797d05 100644
--- a/liblttng-ust/Makefile.am
+++ b/liblttng-ust/Makefile.am
@@ -46,7 +46,8 @@ liblttng_ust_runtime_la_SOURCES = \
 	lttng-ust-uuid.h \
 	error.h \
 	tracef.c \
-	lttng-ust-tracef-provider.h
+	lttng-ust-tracef-provider.h \
+	getenv.h
 
 if HAVE_PERF_EVENT
 liblttng_ust_runtime_la_SOURCES += \
diff --git a/liblttng-ust/getenv.h b/liblttng-ust/getenv.h
new file mode 100644
index 00000000..05864fb8
--- /dev/null
+++ b/liblttng-ust/getenv.h
@@ -0,0 +1,44 @@
+#ifndef _COMPAT_GETENV_H
+#define _COMPAT_GETENV_H
+
+/*
+ * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <usterr-signal-safe.h>
+
+static inline
+int lttng_is_setuid_setgid(void)
+{
+	return geteuid() != getuid() || getegid() != getgid();
+}
+
+static inline
+char *lttng_secure_getenv(const char *name)
+{
+	if (lttng_is_setuid_setgid()) {
+		ERR("Getting environment variable '%s' from setuid/setgid binary refused for security reasons.",
+			name);
+		return NULL;
+	}
+	return getenv(name);
+}
+
+#endif /* _COMPAT_GETENV_H */