From f99098cca406369aeff149bd5e70662de934ec08 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Mon, 9 Feb 2009 15:20:17 +0000
Subject: Use prctl to reenable core dumps when we have setuid to a non-root
 user.

svn:r18449
---
 src/common/compat.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/common/compat.c')

diff --git a/src/common/compat.c b/src/common/compat.c
index fa6967289d..23efe0b656 100644
--- a/src/common/compat.c
+++ b/src/common/compat.c
@@ -83,6 +83,10 @@
 #ifdef HAVE_SYS_FILE_H
 #include <sys/file.h>
 #endif
+#if defined(HAVE_SYS_PRCTL_H) && defined(__linux__)
+/* Only use the linux prctl;  the IRIX prctl is totally different */
+#include <sys/prctl.h>
+#endif
 
 #include "log.h"
 #include "util.h"
@@ -1223,6 +1227,18 @@ switch_id(const char *user)
   }
 
   have_already_switched_id = 1; /* mark success so we never try again */
+
+#if defined(__linux__) && defined(HAVE_SYS_PRCTL_H) && defined(HAVE_PRCTL)
+#ifdef PR_SET_DUMPABLE
+  if (pw->pw_uid) {
+    /* Re-enable core dumps if we're not running as root. */
+    log_info(LD_CONFIG, "Re-enabling coredumps");
+    if (prctl(PR_SET_DUMPABLE, 1)) {
+      log_warn(LD_CONFIG, "Unable to re-enable coredumps: %s",strerror(errno));
+    }
+  }
+#endif
+#endif
   return 0;
 
 #else
-- 
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