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diff -up Linux-PAM-1.1.8/modules/pam_limits/pam_limits.c.check-process Linux-PAM-1.1.8/modules/pam_limits/pam_limits.c
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--- Linux-PAM-1.1.8/modules/pam_limits/pam_limits.c.check-process	2013-06-18 16:11:21.000000000 +0200
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+++ Linux-PAM-1.1.8/modules/pam_limits/pam_limits.c	2014-09-10 16:39:36.263256066 +0200
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@@ -27,6 +27,7 @@
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 #include <errno.h>
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 #include <syslog.h>
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 #include <stdarg.h>
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+#include <signal.h>
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 #include <sys/types.h>
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 #include <sys/stat.h>
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 #include <sys/resource.h>
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@@ -269,16 +270,27 @@ check_logins (pam_handle_t *pamh, const
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             continue;
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 	}
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         if (!pl->flag_numsyslogins) {
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+	    char user[sizeof(ut->UT_USER) + 1];
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+	    user[0] = '\0';
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+	    strncat(user, ut->UT_USER, sizeof(ut->UT_USER));
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+
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 	    if (((pl->login_limit_def == LIMITS_DEF_USER)
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 	         || (pl->login_limit_def == LIMITS_DEF_GROUP)
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 		 || (pl->login_limit_def == LIMITS_DEF_DEFAULT))
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-		&& strncmp(name, ut->UT_USER, sizeof(ut->UT_USER)) != 0) {
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+		&& strcmp(name, user) != 0) {
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                 continue;
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 	    }
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 	    if ((pl->login_limit_def == LIMITS_DEF_ALLGROUP)
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-		&& !pam_modutil_user_in_group_nam_nam(pamh, ut->UT_USER, pl->login_group)) {
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+		&& !pam_modutil_user_in_group_nam_nam(pamh, user, pl->login_group)) {
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                 continue;
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 	    }
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+	    if (kill(ut->ut_pid, 0) == -1 && errno == ESRCH) {
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+		/* process does not exist anymore */
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+		pam_syslog(pamh, LOG_WARNING,
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+			   "Stale utmp entry (pid %d) for '%s' ignored",
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+			   ut->ut_pid, user);
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+		continue;
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+	    }
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 	}
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 	if (++count > limit) {
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 	    break;