File 0002-mount-call-setgroups-before-setuid.patch of Package nfs-utils.16460

Overview Repositories Revisions Requests Users Attributes Meta

File 0002-mount-call-setgroups-before-setuid.patch of Package nfs-utils.16460

From 5b7da9d70261583e67e114b36cb19973de15606d Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.com>
Date: Wed, 8 Feb 2017 08:22:36 +1100
Subject: [PATCH] mount: call setgroups() before setuid()

It is generally wise to call setgroups() (and setgid()) before calling
setuid() to ensure no unexpected permission leaks happen.
SUSE's build system check all binaries for conformance with this
and generates a warning for mountd.

As we set setting the uid to 0, there is no risk that the group list
will provide extra permissions, so there is no real risk here.
But it is nice to silence warnings, and including a setgroups()
call is probably a good practice to encourage.

Signed-off-by: NeilBrown <neilb@suse.com>
---
 utils/mount/network.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/utils/mount/network.c b/utils/mount/network.c
index d1c8fec75174..281e9354a7fa 100644
--- a/utils/mount/network.c
+++ b/utils/mount/network.c
@@ -33,6 +33,7 @@
 #include <errno.h>
 #include <netdb.h>
 #include <time.h>
+#include <grp.h>
 
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -804,6 +805,7 @@ int start_statd(void)
 			pid_t pid = fork();
 			switch (pid) {
 			case 0: /* child */
+				setgroups(0, NULL);
 				setgid(0);
 				setuid(0);
 				execle(START_STATD, START_STATD, NULL, envp);
-- 
2.11.0

Places

File 0002-mount-call-setgroups-before-setuid.patch of Package nfs-utils.16460

Places