X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=probes%2Flttng-kprobes.c;h=65c1d3ba80ecf30eedbe8ccf1402c81ab4864998;hb=64c796d8aec1efa5d6f0d5850d2a0095cb7842e3;hp=9d9fb5b9a759fd6445f70478c907657736f1f082;hpb=e0a7a7c4a6a88a60ae40baeb4f4656f58175993a;p=lttng-modules.git

diff --git a/probes/lttng-kprobes.c b/probes/lttng-kprobes.c
index 9d9fb5b9..65c1d3ba 100644
--- a/probes/lttng-kprobes.c
+++ b/probes/lttng-kprobes.c
@@ -12,6 +12,7 @@
 #include <linux/slab.h>
 #include "../ltt-events.h"
 #include "../wrapper/ringbuffer/frontend_types.h"
+#include "../wrapper/vmalloc.h"
 #include "../ltt-tracer.h"
 
 static
@@ -28,7 +29,7 @@ int lttng_kprobes_handler_pre(struct kprobe *p, struct pt_regs *regs)
 		return 0;
 	lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, sizeof(data),
 				 ltt_alignof(data), -1);
-	ret = chan->ops->event_reserve(&ctx);
+	ret = chan->ops->event_reserve(&ctx, event->id);
 	if (ret < 0)
 		return 0;
 	lib_ring_buffer_align_ctx(&ctx, ltt_alignof(data));
@@ -58,10 +59,14 @@ int lttng_create_kprobe_event(const char *name, struct ltt_event *event)
 	desc->nr_fields = 1;
 	desc->fields = field =
 		kzalloc(1 * sizeof(struct lttng_event_field), GFP_KERNEL);
+	if (!field) {
+		ret = -ENOMEM;
+		goto error_field;
+	}
 	field->name = "ip";
 	field->type.atype = atype_integer;
-	field->type.u.basic.integer.size = sizeof(unsigned long);
-	field->type.u.basic.integer.alignment = ltt_alignof(unsigned long);
+	field->type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
+	field->type.u.basic.integer.alignment = ltt_alignof(unsigned long) * CHAR_BIT;
 	field->type.u.basic.integer.signedness = 0;
 	field->type.u.basic.integer.reverse_byte_order = 0;
 	field->type.u.basic.integer.base = 16;
@@ -70,6 +75,8 @@ int lttng_create_kprobe_event(const char *name, struct ltt_event *event)
 
 	return 0;
 
+error_field:
+	kfree(desc->name);
 error_str:
 	kfree(desc);
 	return ret;
@@ -101,6 +108,14 @@ int lttng_kprobes_register(const char *name,
 		event->u.kprobe.symbol_name;
 	event->u.kprobe.kp.offset = offset;
 	event->u.kprobe.kp.addr = (void *) addr;
+
+	/*
+	 * Ensure the memory we just allocated don't trigger page faults.
+	 * Well.. kprobes itself puts the page fault handler on the blacklist,
+	 * but we can never be too careful.
+	 */
+	wrapper_vmalloc_sync_all();
+
 	ret = register_kprobe(&event->u.kprobe.kp);
 	if (ret)
 		goto register_error;
@@ -109,6 +124,7 @@ int lttng_kprobes_register(const char *name,
 register_error:
 	kfree(event->u.kprobe.symbol_name);
 name_error:
+	kfree(event->desc->fields);
 	kfree(event->desc->name);
 	kfree(event->desc);
 error:
@@ -120,6 +136,7 @@ void lttng_kprobes_unregister(struct ltt_event *event)
 {
 	unregister_kprobe(&event->u.kprobe.kp);
 	kfree(event->u.kprobe.symbol_name);
+	kfree(event->desc->fields);
 	kfree(event->desc->name);
 	kfree(event->desc);
 }