D16950.diff
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	Index: head/lib/libpam/modules/pam_exec/pam_exec.8
	===================================================================
	--- head/lib/libpam/modules/pam_exec/pam_exec.8
	+++ head/lib/libpam/modules/pam_exec/pam_exec.8
	@@ -74,7 +74,8 @@
	Use the program exit status as the return code of the pam_sm_* function.
	It must be a valid return value for this function.
	.It Cm expose_authtok
	-Write the authentication token to the program's standard input stream.
	+Write the authentication token to the program's standard input stream,
	+followed by a NUL character.
	.It Cm --
	Stop options parsing;
	program and its arguments follow.
	Index: head/lib/libpam/modules/pam_exec/pam_exec.c
	===================================================================
	--- head/lib/libpam/modules/pam_exec/pam_exec.c
	+++ head/lib/libpam/modules/pam_exec/pam_exec.c
	@@ -254,7 +254,8 @@
	}
	rc = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
	if (rc == PAM_SUCCESS) {
	- authtok_size = strlen(authtok);
	+ /* We include the trailing NUL-terminator. */
	+ authtok_size = strlen(authtok) + 1;
	} else {
	openpam_log(PAM_LOG_ERROR, "%s: pam_get_authtok(): %s", func,
	pam_strerror(pamh, rc));