From: Etienne CHAMPETIER <champetier.etienne@gmail.com>
Date: Sun, 29 May 2016 23:39:12 +0000 (+0000)
Subject: jail: call chdir(/) after pivot_root()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=8e4fd3397dcdf79c0e0af9e12dc2bcf22d83d645;p=project%2Fprocd.git

jail: call chdir(/) after pivot_root()

pivot_root(2) man page recommend calling chdir(/), so do it

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>
---

diff --git a/jail/jail.c b/jail/jail.c
index 541363a..8157a8f 100644
--- a/jail/jail.c
+++ b/jail/jail.c
@@ -162,6 +162,10 @@ static int build_jail_fs(void)
 		ERROR("pivot_root failed: %s\n", strerror(errno));
 		return -1;
 	}
+	if (chdir("/")) {
+		ERROR("chdir(/) failed: %s\n", strerror(errno));
+		return -1;
+	}
 
 	snprintf(dirbuf, sizeof(dirbuf), "/old%s", jail_root);
 	rmdir(dirbuf);