X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=lttng-syscalls.c;h=5cac721200bb8aa5cab44ffcfa281e380d7ccfe1;hb=bcde0d5b7da973a9372b3db4acc0b08b9589e05b;hp=1489934f3319bbad05de08d3c404f155bd2feac7;hpb=cecef7f86625593d7e26337294ceda7252557f59;p=lttng-modules.git

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index 1489934f..5cac7212 100644
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -1036,6 +1036,8 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
 	WARN_ON_ONCE(!chan->sc_table);
 
 	if (!chan->sc_filter) {
+		if (!chan->syscall_all)
+			return -EEXIST;
 		filter = kzalloc(sizeof(struct lttng_syscall_filter),
 				GFP_KERNEL);
 		if (!filter)
@@ -1048,6 +1050,14 @@ 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);