3 files changed, 76 insertions, 0 deletions
diff --git a/usr/src/test/libc-tests/runfiles/default.run b/usr/src/test/libc-tests/runfiles/default.run
index 801558459a..864001eb46 100644
--- a/usr/src/test/libc-tests/runfiles/default.run
+++ b/usr/src/test/libc-tests/runfiles/default.run
@@ -62,6 +62,8 @@ outputdir = /var/tmp/test_results
 [/opt/libc-tests/tests/catopen]
 [/opt/libc-tests/tests/env-OS-4089.32]
 [/opt/libc-tests/tests/env-OS-4089.64]
+[/opt/libc-tests/tests/env-7076.32]
+[/opt/libc-tests/tests/env-7076.64]
 [/opt/libc-tests/tests/endian.32]
 [/opt/libc-tests/tests/endian.64]
 [/opt/libc-tests/tests/quick_exit]
diff --git a/usr/src/test/libc-tests/tests/Makefile b/usr/src/test/libc-tests/tests/Makefile
index 34c0123d88..68f6df3b2d 100644
--- a/usr/src/test/libc-tests/tests/Makefile
+++ b/usr/src/test/libc-tests/tests/Makefile
@@ -35,6 +35,7 @@ PROGS = \
 	c11_tss \
 	call_once \
 	endian \
+	env-7076 \
 	quick_exit_order \
 	quick_exit_status \
 	timespec_get
diff --git a/usr/src/test/libc-tests/tests/env-7076.c b/usr/src/test/libc-tests/tests/env-7076.c
new file mode 100644
index 0000000000..6349747bd8
--- /dev/null
+++ b/usr/src/test/libc-tests/tests/env-7076.c
@@ -0,0 +1,73 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2016 Joyent, Inc.
+ */
+
+/*
+ * Regression test for 7076 where doing a putenv() call without an '=' sign
+ * may lead to a segmentation fault when doing a getenv() depending on the
+ * circumstances of the environment's layout. Verify putenv() mimics
+ * unsetenv().
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/debug.h>
+
+int
+main(void)
+{
+	if (putenv("FOO=bar") != 0) {
+		fprintf(stderr, "failed to put FOO into the environment: %s\n",
+		    strerror(errno));
+		return (1);
+	}
+
+	if (getenv("FOO") == NULL) {
+		fprintf(stderr, "failed to retrieve FOO from the "
+		    "environment!\n");
+		return (1);
+	}
+
+	VERIFY0(unsetenv("FOO"));
+
+	if (getenv("FOO") != NULL) {
+		fprintf(stderr, "Somehow retrieved FOO from the "
+		    "environment after unsetenv()!\n");
+		return (1);
+	}
+
+	if (putenv("FOO=bar") != 0) {
+		fprintf(stderr, "failed to put FOO into the environment: %s\n",
+		    strerror(errno));
+		return (1);
+	}
+
+	if (getenv("FOO") == NULL) {
+		fprintf(stderr, "failed to retrieve FOO from the "
+		    "environment!\n");
+		return (1);
+	}
+
+	VERIFY0(putenv("FOO"));
+
+	if (getenv("FOO") != NULL) {
+		fprintf(stderr, "Somehow retrieved FOO from the "
+		    "environment after putenv()!\n");
+		return (1);
+	}
+
+	return (0);
+}