From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 24 Sep 2014 01:02:51 +0000 (-0400)
Subject: Fix: syscall: fail disable all if all already disabled
X-Git-Tag: v2.6.0-rc1~24
X-Git-Url: http://git.lttng.org/?p=lttng-modules.git;a=commitdiff_plain;h=404e87bf6e1a448d1b6a93c2b67b801f039235f3

Fix: syscall: fail disable all if all already disabled

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index 1489934f..00584e3e 100644
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -1048,6 +1048,14 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
 	}
 
 	if (!name) {
+		/* Fail if all syscalls are already disabled. */
+		if (bitmap_empty(filter->sc, NR_syscalls)
+			&& bitmap_empty(filter->sc_compat,
+				NR_compat_syscalls)) {
+			ret = -EEXIST;
+			goto error;
+		}
+
 		/* Disable all system calls */
 		bitmap_clear(filter->sc, 0, NR_syscalls);
 		bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);