lttng-filter-specialize.o \
lttng-filter-validator.o \
probes/lttng-probe-user.o \
- lttng-tp-mempool.o
+ lttng-tp-mempool.o \
+ probes/lttng-uprobes.o
ifneq ($(CONFIG_HAVE_SYSCALL_TRACEPOINTS),)
lttng-tracer-objs += lttng-syscalls.o
default:
return -ENOIOCTLCMD;
}
-
}
/**
LTTNG_KERNEL_KRETPROBE = 3,
LTTNG_KERNEL_NOOP = 4, /* not hooked */
LTTNG_KERNEL_SYSCALL = 5,
+ LTTNG_KERNEL_UPROBE = 6,
};
/*
char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
} __attribute__((packed));
+struct lttng_kernel_uprobe {
+ char path[LTTNG_KERNEL_SYM_NAME_LEN];
+ uint64_t offset;
+} __attribute__((packed));
+
/*
* For syscall tracing, name = "*" means "enable all".
*/
struct lttng_kernel_kretprobe kretprobe;
struct lttng_kernel_kprobe kprobe;
struct lttng_kernel_function_tracer ftrace;
+ struct lttng_kernel_uprobe uprobe;
char padding[LTTNG_KERNEL_EVENT_PADDING2];
} u;
} __attribute__((packed));
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_NOOP:
WRITE_ONCE(event->enabled, 1);
break;
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_NOOP:
WRITE_ONCE(event->enabled, 0);
break;
event_name = event_desc->name;
break;
case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_KRETPROBE:
case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_NOOP:
goto register_error;
}
break;
+ case LTTNG_KERNEL_UPROBE:
+
+ ret = lttng_uprobes_register(event_param->name,
+ event_param->u.uprobe.path,
+ event_param->u.uprobe.offset,
+ event);
+ if (ret)
+ goto register_error;
+ ret = try_module_get(event->desc->owner);
+ WARN_ON_ONCE(!ret);
+ break;
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
case LTTNG_KERNEL_NOOP:
ret = 0;
break;
+ case LTTNG_KERNEL_UPROBE:
+ lttng_uprobes_unregister(event);
+ ret = 0;
+ break;
default:
WARN_ON_ONCE(1);
}
case LTTNG_KERNEL_NOOP:
case LTTNG_KERNEL_SYSCALL:
break;
+ case LTTNG_KERNEL_UPROBE:
+ module_put(event->desc->owner);
+ lttng_uprobes_destroy_private(event);
+ break;
default:
WARN_ON_ONCE(1);
}
#include <linux/kref.h>
#include <lttng-cpuhotplug.h>
#include <wrapper/uuid.h>
+#include <wrapper/uprobes.h>
#include <lttng-tracer.h>
#include <lttng-abi.h>
#include <lttng-abi-old.h>
struct {
char *symbol_name;
} ftrace;
+ struct {
+ struct uprobe_consumer up_consumer;
+ struct inode *inode;
+ loff_t offset;
+ } uprobe;
} u;
struct list_head list; /* Event list in session */
unsigned int metadata_dumped:1;
}
#endif
+#ifdef CONFIG_UPROBES
+int lttng_uprobes_register(const char *name,
+ const char *path,
+ uint64_t offset,
+ struct lttng_event *event);
+void lttng_uprobes_unregister(struct lttng_event *event);
+void lttng_uprobes_destroy_private(struct lttng_event *event);
+#else
+static inline
+int lttng_uprobes_register(const char *name,
+ const char *path,
+ uint64_t offset,
+ struct lttng_event *event)
+{
+ return -ENOSYS;
+}
+
+static inline
+void lttng_uprobes_unregister(struct lttng_event *event)
+{
+}
+
+static inline
+void lttng_uprobes_destroy_private(struct lttng_event *event)
+{
+}
+#endif
+
#ifdef CONFIG_KRETPROBES
int lttng_kretprobes_register(const char *name,
const char *symbol_name,
--- /dev/null
+/*
+ * probes/lttng-uprobes.c
+ *
+ * LTTng uprobes integration module.
+ *
+ * Copyright (C) 2013 Yannick Brosseau <yannick.brosseau@gmail.com>
+ * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/fdtable.h>
+#include <linux/module.h>
+#include <linux/namei.h>
+#include <linux/slab.h>
+#include <lttng-events.h>
+#include <lttng-tracer.h>
+#include <wrapper/irqflags.h>
+#include <wrapper/ringbuffer/frontend_types.h>
+#include <wrapper/uprobes.h>
+#include <wrapper/vmalloc.h>
+
+static
+int lttng_uprobes_handler_pre(struct uprobe_consumer *uc, struct pt_regs *regs)
+{
+ struct lttng_event *event =
+ container_of(uc, struct lttng_event, u.uprobe.up_consumer);
+ struct lttng_probe_ctx lttng_probe_ctx = {
+ .event = event,
+ .interruptible = !lttng_regs_irqs_disabled(regs),
+ };
+ struct lttng_channel *chan = event->chan;
+ struct lib_ring_buffer_ctx ctx;
+ int ret;
+
+ struct {
+ unsigned long ip;
+ } payload;
+
+ if (unlikely(!ACCESS_ONCE(chan->session->active)))
+ return 0;
+ if (unlikely(!ACCESS_ONCE(chan->enabled)))
+ return 0;
+ if (unlikely(!ACCESS_ONCE(event->enabled)))
+ return 0;
+
+ lib_ring_buffer_ctx_init(&ctx, chan->chan, <tng_probe_ctx,
+ sizeof(payload), lttng_alignof(payload), -1);
+
+ ret = chan->ops->event_reserve(&ctx, event->id);
+ if (ret < 0)
+ return 0;
+
+ /* Event payload. */
+ payload.ip = regs->ip;
+ lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
+ chan->ops->event_write(&ctx, &payload, sizeof(payload));
+ chan->ops->event_commit(&ctx);
+ return 0;
+}
+
+/*
+ * Create event description.
+ */
+static
+int lttng_create_uprobe_event(const char *name, struct lttng_event *event)
+{
+ struct lttng_event_desc *desc;
+ struct lttng_event_field *fields;
+ int ret;
+
+ desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+ desc->name = kstrdup(name, GFP_KERNEL);
+ if (!desc->name) {
+ ret = -ENOMEM;
+ goto error_str;
+ }
+
+ desc->nr_fields = 1;
+ desc->fields = fields =
+ kzalloc(1 * sizeof(struct lttng_event_field), GFP_KERNEL);
+
+ if (!desc->fields) {
+ ret = -ENOMEM;
+ goto error_fields;
+ }
+ fields[0].name = "ip";
+ fields[0].type.atype = atype_integer;
+ fields[0].type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
+ fields[0].type.u.basic.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
+ fields[0].type.u.basic.integer.signedness = lttng_is_signed_type(unsigned long);
+ fields[0].type.u.basic.integer.reverse_byte_order = 0;
+ fields[0].type.u.basic.integer.base = 16;
+ fields[0].type.u.basic.integer.encoding = lttng_encode_none;
+
+ desc->owner = THIS_MODULE;
+ event->desc = desc;
+
+ return 0;
+
+error_fields:
+ kfree(desc->name);
+error_str:
+ kfree(desc);
+ return ret;
+}
+
+int lttng_uprobes_register(const char *name,
+ const char *path_name,
+ uint64_t offset,
+ struct lttng_event *event)
+{
+ int ret;
+
+ /* Shoudl we fail if the path is empty, it should be checked before */
+ if (path_name[0] == '\0')
+ path_name = NULL;
+
+ ret = lttng_create_uprobe_event(name, event);
+ if (ret)
+ goto error;
+
+ memset(&event->u.uprobe.up_consumer, 0,
+ sizeof(event->u.uprobe.up_consumer));
+
+ event->u.uprobe.up_consumer.handler = lttng_uprobes_handler_pre;
+ if (path_name) {
+ struct path path;
+ ret = kern_path(path_name, LOOKUP_FOLLOW, &path);
+ if (ret)
+ goto path_error;
+
+ event->u.uprobe.inode = igrab(path.dentry->d_inode);
+ }
+ event->u.uprobe.offset = offset;
+
+ /* Ensure the memory we just allocated don't trigger page faults. */
+ wrapper_vmalloc_sync_all();
+ printk(KERN_WARNING "Registering probe on inode %lu and offset %llu\n", event->u.uprobe.inode->i_ino, event->u.uprobe.offset);
+ ret = wrapper_uprobe_register(event->u.uprobe.inode,
+ event->u.uprobe.offset,
+ &event->u.uprobe.up_consumer);
+ if (ret) {
+ printk(KERN_WARNING "Error registering probe on inode %lu "
+ "and offset %llu\n", event->u.uprobe.inode->i_ino,
+ event->u.uprobe.offset);
+ goto register_error;
+ }
+ return 0;
+
+register_error:
+ iput(event->u.uprobe.inode);
+path_error:
+ kfree(event->desc->name);
+ kfree(event->desc);
+error:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_register);
+
+void lttng_uprobes_unregister(struct lttng_event *event)
+{
+ wrapper_uprobe_unregister(event->u.uprobe.inode,
+ event->u.uprobe.offset,
+ &event->u.uprobe.up_consumer);
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_unregister);
+
+void lttng_uprobes_destroy_private(struct lttng_event *event)
+{
+ iput(event->u.uprobe.inode);
+ kfree(event->desc->name);
+ kfree(event->desc);
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_private);
+
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Yannick Brosseau");
+MODULE_DESCRIPTION("Linux Trace Toolkit Uprobes Support");
--- /dev/null
+#ifndef _LTTNG_WRAPPER_UPROBES_H
+#define _LTTNG_WRAPPER_UPROBES_H
+
+/*
+ * wrapper/uprobes.h
+ *
+ * wrapper around uprobes. Using KALLSYMS to get its address when
+ * available, else we need to have a kernel that exports this function to GPL
+ * modules.
+ *
+ * Copyright (C) 2013 Yannick Brosseau <yannick.brosseau@gmail.com>
+ * Copyright (C) 2017 Francis Deslauriers <francis.deslauriers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/version.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0))
+#include <linux/uprobes.h>
+
+/* Use kallsym lookup for version before 3.9. */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
+
+static inline
+int wrapper_uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
+{
+ return uprobe_register(inode, offset, uc);
+}
+
+static inline
+void wrapper_uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
+{
+ uprobe_unregister(inode, offset, uc);
+}
+
+#else /* Version < 3.9, use kallsym lookup. */
+#include "kallsyms.h"
+
+static inline
+int wrapper_uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
+{
+ int (*uprobe_register_sym)(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
+
+ uprobe_register_sym = (void *) kallsyms_lookup_funcptr("uprobe_register");
+
+ if (uprobe_register_sym) {
+ return uprobe_register_sym(inode, offset, uc);
+ } else {
+ printk(KERN_WARNING "LTTng: uprobe_register symbol lookup failed.\n");
+ return -EINVAL;
+ }
+}
+
+static inline
+void wrapper_uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
+{
+ int (*uprobe_unregister_sym)(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
+
+ uprobe_unregister_sym = (void *) kallsyms_lookup_funcptr("uprobe_unregister");
+
+ if (uprobe_unregister_sym) {
+ uprobe_unregister_sym(inode, offset, uc);
+ } else {
+ printk(KERN_WARNING "LTTng: uprobe_unregister symbol lookup failed.\n");
+ WARN_ON(1);
+ }
+}
+#endif
+#else
+/* Version < 3.5, before uprobe was added. */
+struct uprobe_consumer {};
+
+#endif
+#endif
projects / lttng-modules.git / commitdiff
