From: Etienne CHAMPETIER <champetier.etienne@gmail.com>
Date: Wed, 1 Jun 2016 20:54:06 +0000 (+0000)
Subject: jail: don't always CLONE_NEWUTS
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fprocd.git;a=commitdiff_plain;h=b8eb07c22fc5f3dea04d9843e8fd6d2eac6e61fa

jail: don't always CLONE_NEWUTS

no -h => no CLONE_NEWUTS
-h "" => CLONE_NEWUTS
-h "newjailhostname" => CLONE_NEWUTS + sethostname

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

diff --git a/jail/jail.c b/jail/jail.c
index e425254..c442847 100644
--- a/jail/jail.c
+++ b/jail/jail.c
@@ -244,7 +244,7 @@ static int exec_jail(void *_notused)
 		exit(EXIT_FAILURE);
 	}
 
-	if (opts.namespace && opts.hostname
+	if (opts.namespace && opts.hostname && strlen(opts.hostname) > 0
 			&& sethostname(opts.hostname, strlen(opts.hostname))) {
 		ERROR("sethostname(%s) failed: %s\n", opts.hostname, strerror(errno));
 		exit(EXIT_FAILURE);
@@ -386,9 +386,10 @@ int main(int argc, char **argv)
 
 	uloop_init();
 	if (opts.namespace) {
-		jail_process.pid = clone(exec_jail,
-			child_stack + STACK_SIZE,
-			CLONE_NEWUTS | CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | SIGCHLD, NULL);
+		int flags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | SIGCHLD;
+		if (opts.hostname)
+			flags |= CLONE_NEWUTS;
+		jail_process.pid = clone(exec_jail, child_stack + STACK_SIZE, flags, NULL);
 	} else {
 		jail_process.pid = fork();
 	}