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diff -ru cronie-1.5.2/src/cronnext.c cronie-1.5.2_patched/src/cronnext.c
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--- cronie-1.5.2/src/cronnext.c	2018-05-03 18:41:12.000000000 +0200
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+++ cronie-1.5.2_patched/src/cronnext.c	2018-09-07 15:17:54.555924440 +0200
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@@ -71,13 +71,13 @@
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 /*
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  * print entry flags
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  */
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-char *flagname[]= {
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-	[MIN_STAR] =	"MIN_STAR",
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-	[HR_STAR] =	"HR_STAR",
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-	[DOM_STAR] =	"DOM_STAR",
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-	[DOW_STAR] =	"DOW_STAR",
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-	[WHEN_REBOOT] =	"WHEN_REBOOT",
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-	[DONT_LOG] =	"DONT_LOG"
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+const char *flagname[]= {
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+	"MIN_STAR",
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+	"HR_STAR",
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+	"DOM_STAR",
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+	"DOW_STAR",
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+	"WHEN_REBOOT",
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+	"DONT_LOG"
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 };
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 void printflags(char *indent, int flags) {
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@@ -85,8 +85,8 @@
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 	int first = 1;
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 	printf("%s    flagnames:", indent);
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-	for (f = 1; f < sizeof(flagname);  f = f << 1)
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-		if (flags & f) {
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+	for (f = 0; f < sizeof(flagname)/sizeof(char *);  f++)
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+		if (flags & (int)1 << f) {
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 			printf("%s%s", first ? " " : "|", flagname[f]);
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 			first = 0;
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 		}
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diff -ru cronie-1.5.2/src/do_command.c cronie-1.5.2_patched/src/do_command.c
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--- cronie-1.5.2/src/do_command.c	2017-09-14 13:53:21.000000000 +0200
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+++ cronie-1.5.2_patched/src/do_command.c	2018-09-07 15:17:54.555924440 +0200
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@@ -418,7 +418,7 @@
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 			if (mailto && safe_p(usernm, mailto)
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 				&& strncmp(MailCmd,"off",3) && !SyslogOutput) {
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 				char **env;
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-				char mailcmd[MAX_COMMAND];
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+				char mailcmd[MAX_COMMAND+1]; /* +1 for terminator */
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 				char hostname[MAXHOSTNAMELEN];
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 				char *content_type = env_get("CONTENT_TYPE", jobenv),
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 					*content_transfer_encoding =
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@@ -434,7 +434,7 @@
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 					}
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 				}
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 				else {
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-					strncpy(mailcmd, MailCmd, MAX_COMMAND);
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+					strncpy(mailcmd, MailCmd, MAX_COMMAND+1);
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 				}
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 				if (!(mail = cron_popen(mailcmd, "w", e->pwd, jobenv))) {
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 					perror(mailcmd);
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diff -ru cronie-1.5.2/src/env.c cronie-1.5.2_patched/src/env.c
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--- cronie-1.5.2/src/env.c	2017-09-14 13:53:21.000000000 +0200
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+++ cronie-1.5.2_patched/src/env.c	2018-09-07 15:17:54.554924435 +0200
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@@ -63,7 +63,7 @@
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 		for (i = 0; i < count; i++)
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 			if ((p[i] = strdup(envp[i])) == NULL) {
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 				save_errno = errno;
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-				while (--i >= 0)
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+				while (i-- > 0)
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 					free(p[i]);
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 				free(p);
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 				errno = save_errno;
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@@ -263,7 +263,9 @@
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 	}
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 	if (state != FINI && state != EQ2 && !(state == VALUE && !quotechar)) {
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 		Debug(DPARS, ("load_env, not an env var, state = %d\n", state));
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-			fseek(f, filepos, 0);
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+			if (fseek(f, filepos, 0)) {
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+                return ERR;
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+           }
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 		Set_LineNum(fileline);
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 		return (FALSE);
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 	}
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diff -ru cronie-1.5.2/src/globals.h cronie-1.5.2_patched/src/globals.h
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--- cronie-1.5.2/src/globals.h	2017-01-17 16:53:50.000000000 +0100
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+++ cronie-1.5.2_patched/src/globals.h	2018-09-07 15:17:54.555924440 +0200
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@@ -77,7 +77,7 @@
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 XTRN time_t	StartTime;
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 XTRN int	NoFork;
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 XTRN int        PermitAnyCrontab;
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-XTRN char       MailCmd[MAX_COMMAND];
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+XTRN char       MailCmd[MAX_COMMAND+1]; /* +1 for terminator */
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 XTRN char       cron_default_mail_charset[MAX_ENVSTR];
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 XTRN int        EnableClustering;
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 XTRN int	ChangePath;
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diff -ru cronie-1.5.2/src/security.c cronie-1.5.2_patched/src/security.c
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--- cronie-1.5.2/src/security.c	2017-09-14 13:29:47.000000000 +0200
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+++ cronie-1.5.2_patched/src/security.c	2018-09-07 15:17:54.554924435 +0200
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@@ -417,7 +417,7 @@
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 		}
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 	}
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-	if (strcmp(u->scontext, ucontext)) {
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+	if (!ucontext || strcmp(u->scontext, ucontext)) {
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 		if (!cron_authorize_range(u->scontext, ucontext)) {
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 			if (security_getenforce() > 0) {
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 # ifdef WITH_AUDIT
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diff -ru cronie-1.5.2/src/user.c cronie-1.5.2_patched/src/user.c
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--- cronie-1.5.2/src/user.c	2017-01-17 16:53:50.000000000 +0100
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+++ cronie-1.5.2_patched/src/user.c	2018-09-07 15:17:54.555924440 +0200
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@@ -44,6 +44,10 @@
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 free_user (user * u) {
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 	entry *e, *ne;
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+	if (!u) {
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+		return;
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+	}
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+
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 	free(u->name);
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 	free(u->tabname);
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 	for (e = u->crontab; e != NULL; e = ne)	{