From: David Goulet <dgoulet@efficios.com>
Date: Thu, 19 Jan 2012 18:43:57 +0000 (-0500)
Subject: Don't init kernel tracer if not root (UID=0)
X-Git-Tag: v2.0-pre17~2
X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=d1f1c568e4e28b57156da4fce6b815a56166ecc6

Don't init kernel tracer if not root (UID=0)

No point of trying to init kernel tracer if the session daemon is not
root. At this time, only UID=0 can load kernel modules and interact with
the lttng kernel tracer.

Reported-by: Daniel Thibault <daniel.thibault@drdc-rddc.gc.ca>
Signed-off-by: David Goulet <dgoulet@efficios.com>
---

diff --git a/lttng-sessiond/main.c b/lttng-sessiond/main.c
index 4828f1c17..7d8546d8e 100644
--- a/lttng-sessiond/main.c
+++ b/lttng-sessiond/main.c
@@ -3273,6 +3273,11 @@ static int process_client_msg(struct command_ctx *cmd_ctx)
 	 */
 	switch (cmd_ctx->lsm->domain.type) {
 	case LTTNG_DOMAIN_KERNEL:
+		if (!is_root) {
+			ret = LTTCOMM_KERN_NA;
+			goto error;
+		}
+
 		/* Kernel tracer check */
 		if (kernel_tracer_fd == 0) {
 			/* Basically, load kernel tracer modules */