From dcad1a204f72624796ae83359403898d10393b9c Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Wed, 3 Jul 2013 16:40:28 +0900 Subject: [PATCH] tracing/uprobes: Fetch args before reserving a ring buffer Fetching from user space should be done in a non-atomic context. So use a per-cpu buffer and copy its content to the ring buffer atomically. Note that we can migrate during accessing user memory thus use a per-cpu mutex to protect concurrent accesses. This is needed since we'll be able to fetch args from an user memory which can be swapped out. Before that uprobes could fetch args from registers only which saved in a kernel space. While at it, use __get_data_size() and store_trace_args() to reduce code duplication. And add struct uprobe_cpu_buffer and its helpers as suggested by Oleg. Reviewed-by: Masami Hiramatsu Acked-by: Oleg Nesterov Cc: Srikar Dronamraju Cc: zhangwei(Jovi) Cc: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim --- kernel/trace/trace_uprobe.c | 146 ++++++++++++++++++++++++++++++++---- 1 file changed, 132 insertions(+), 14 deletions(-) diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 8bfd29a8d713..794e8bc171f3 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -652,21 +652,117 @@ static const struct file_operations uprobe_profile_ops = { .release = seq_release, }; +struct uprobe_cpu_buffer { + struct mutex mutex; + void *buf; +}; +static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer; +static int uprobe_buffer_refcnt; + +static int uprobe_buffer_init(void) +{ + int cpu, err_cpu; + + uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer); + if (uprobe_cpu_buffer == NULL) + return -ENOMEM; + + for_each_possible_cpu(cpu) { + struct page *p = alloc_pages_node(cpu_to_node(cpu), + GFP_KERNEL, 0); + if (p == NULL) { + err_cpu = cpu; + goto err; + } + per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p); + mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex); + } + + return 0; + +err: + for_each_possible_cpu(cpu) { + if (cpu == err_cpu) + break; + free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf); + } + + free_percpu(uprobe_cpu_buffer); + return -ENOMEM; +} + +static int uprobe_buffer_enable(void) +{ + int ret = 0; + + BUG_ON(!mutex_is_locked(&event_mutex)); + + if (uprobe_buffer_refcnt++ == 0) { + ret = uprobe_buffer_init(); + if (ret < 0) + uprobe_buffer_refcnt--; + } + + return ret; +} + +static void uprobe_buffer_disable(void) +{ + BUG_ON(!mutex_is_locked(&event_mutex)); + + if (--uprobe_buffer_refcnt == 0) { + free_percpu(uprobe_cpu_buffer); + uprobe_cpu_buffer = NULL; + } +} + +static struct uprobe_cpu_buffer *uprobe_buffer_get(void) +{ + struct uprobe_cpu_buffer *ucb; + int cpu; + + cpu = raw_smp_processor_id(); + ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu); + + /* + * Use per-cpu buffers for fastest access, but we might migrate + * so the mutex makes sure we have sole access to it. + */ + mutex_lock(&ucb->mutex); + + return ucb; +} + +static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb) +{ + mutex_unlock(&ucb->mutex); +} + static void uprobe_trace_print(struct trace_uprobe *tu, unsigned long func, struct pt_regs *regs) { struct uprobe_trace_entry_head *entry; struct ring_buffer_event *event; struct ring_buffer *buffer; + struct uprobe_cpu_buffer *ucb; void *data; - int size, i; + int size, dsize, esize; struct ftrace_event_call *call = &tu->tp.call; - size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); + dsize = __get_data_size(&tu->tp, regs); + esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); + + if (WARN_ON_ONCE(!uprobe_cpu_buffer || tu->tp.size + dsize > PAGE_SIZE)) + return; + + ucb = uprobe_buffer_get(); + store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize); + + size = esize + tu->tp.size + dsize; event = trace_current_buffer_lock_reserve(&buffer, call->event.type, - size + tu->tp.size, 0, 0); + size, 0, 0); if (!event) - return; + goto out; entry = ring_buffer_event_data(event); if (is_ret_probe(tu)) { @@ -678,13 +774,13 @@ static void uprobe_trace_print(struct trace_uprobe *tu, data = DATAOF_TRACE_ENTRY(entry, false); } - for (i = 0; i < tu->tp.nr_args; i++) { - call_fetch(&tu->tp.args[i].fetch, regs, - data + tu->tp.args[i].offset); - } + memcpy(data, ucb->buf, tu->tp.size + dsize); if (!call_filter_check_discard(call, entry, buffer, event)) trace_buffer_unlock_commit(buffer, event, 0, 0); + +out: + uprobe_buffer_put(ucb); } /* uprobe handler */ @@ -752,6 +848,10 @@ probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter) if (trace_probe_is_enabled(&tu->tp)) return -EINTR; + ret = uprobe_buffer_enable(); + if (ret < 0) + return ret; + WARN_ON(!uprobe_filter_is_empty(&tu->filter)); tu->tp.flags |= flag; @@ -772,6 +872,8 @@ static void probe_event_disable(struct trace_uprobe *tu, int flag) uprobe_unregister(tu->inode, tu->offset, &tu->consumer); tu->tp.flags &= ~flag; + + uprobe_buffer_disable(); } static int uprobe_event_define_fields(struct ftrace_event_call *event_call) @@ -898,11 +1000,24 @@ static void uprobe_perf_print(struct trace_uprobe *tu, struct ftrace_event_call *call = &tu->tp.call; struct uprobe_trace_entry_head *entry; struct hlist_head *head; + struct uprobe_cpu_buffer *ucb; void *data; - int size, rctx, i; + int size, dsize, esize; + int rctx; + + dsize = __get_data_size(&tu->tp, regs); + esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); - size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); - size = ALIGN(size + tu->tp.size + sizeof(u32), sizeof(u64)) - sizeof(u32); + if (WARN_ON_ONCE(!uprobe_cpu_buffer)) + return; + + size = esize + tu->tp.size + dsize; + size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32); + if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough")) + return; + + ucb = uprobe_buffer_get(); + store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize); preempt_disable(); head = this_cpu_ptr(call->perf_events); @@ -922,15 +1037,18 @@ static void uprobe_perf_print(struct trace_uprobe *tu, data = DATAOF_TRACE_ENTRY(entry, false); } - for (i = 0; i < tu->tp.nr_args; i++) { - struct probe_arg *parg = &tu->tp.args[i]; + memcpy(data, ucb->buf, tu->tp.size + dsize); + + if (size - esize > tu->tp.size + dsize) { + int len = tu->tp.size + dsize; - call_fetch(&parg->fetch, regs, data + parg->offset); + memset(data + len, 0, size - esize - len); } perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL); out: preempt_enable(); + uprobe_buffer_put(ucb); } /* uprobe profile handler */ -- 2.20.1