From: Daniel Lezcano <dlezcano@fr.ibm.com>

Remove the CAP_SYS_BOOT capability from the bouding set, so we can poweroff, halt, reboot the container safely without shutting down the real host. Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>

From: Daniel Lezcano <dlezcano@fr.ibm.com>
42ff343d · dlezcano · 96950ed0 · 42ff343d
Commit 42ff343d authored Nov 04, 2008 by dlezcano
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start.c src/lxc/start.c +6 -0

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--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -35,6 +35,7 @@
 #include <sys/mount.h>
 #include <sys/types.h>
 #include <sys/prctl.h>
+#include <sys/capability.h>
 #include <sys/wait.h>

 #include <lxc/lxc.h>
@@ -138,6 +139,11 @@ int lxc_start(const char *name, int argc, char *argv[],
 				goto out_child;
 			}

+		if (prctl(PR_CAPBSET_DROP, CAP_SYS_BOOT, 0, 0, 0)) {
+			lxc_log_syserror("failed to remove CAP_SYS_BOOT capability");
+			goto out_child;
+		}
+
 		execvp(argv[0], argv);
 		lxc_log_syserror("failed to exec %s", argv[0]);