Prepare jail(8) utility for new functionality which will limit

seeing status of mounted file system for jailed processes.
Pass full path of jail's root directory to the kernel. mount(8) utility is
doing the same thing already.

1 files changed, 6 insertions, 4 deletions

diff --git a/usr.sbin/jail/jail.c b/usr.sbin/jail/jail.c
index 1e5ff9b..ab188ee 100644
--- a/usr.sbin/jail/jail.c
+++ b/usr.sbin/jail/jail.c
@@ -52,7 +52,7 @@ main(int argc, char **argv)
 	struct passwd *pwd;
 	struct in_addr in;
 	int ch, groups[NGROUPS], i, iflag, ngroups, uflag, Uflag;
-	char *username;
+	char path[PATH_MAX], *username;
 
 	iflag = uflag = Uflag = 0;
 	username = NULL;
@@ -82,11 +82,13 @@ main(int argc, char **argv)
 		usage();
 	if (uflag)
 		GET_USER_INFO;
-	if (chdir(argv[0]) != 0)
-		err(1, "chdir: %s", argv[0]);
+	if (realpath(argv[0], path) == NULL)
+		err(1, "realpath: %s", argv[0]);
+	if (chdir(path) != 0)
+		err(1, "chdir: %s", path);
 	memset(&j, 0, sizeof(j));
 	j.version = 0;
-	j.path = argv[0];
+	j.path = path;
 	j.hostname = argv[1];
 	if (inet_aton(argv[2], &in) == 0)
 		errx(1, "Could not make sense of ip-number: %s", argv[2]);