From 3c235a337e205da0f614e456be72881483dcde6e Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 22 Sep 2009 13:51:54 +0800 Subject: tracing: Fix off-by-one in trace_get_user() Leave the last slot for the tailing '\0'. Signed-off-by: Li Zefan Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Steven Rostedt LKML-Reference: <4AB865FA.5080801@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a35925d..ae17453 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -415,7 +415,7 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf, /* read the non-space input */ while (cnt && !isspace(ch)) { - if (parser->idx < parser->size) + if (parser->idx < parser->size - 1) parser->buffer[parser->idx++] = ch; else { ret = -EINVAL; -- cgit v1.1 From 4ba7978e98a3ff92cebfb0f31a02c309e3ffa1fe Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 22 Sep 2009 13:52:20 +0800 Subject: tracing: Check the return value of trace_get_user() Return immediately if trace_get_user() returned failure. Signed-off-by: Li Zefan Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Steven Rostedt LKML-Reference: <4AB86614.7020803@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- kernel/trace/ftrace.c | 9 ++++----- kernel/trace/trace_events.c | 7 +++---- 2 files changed, 7 insertions(+), 9 deletions(-) (limited to 'kernel') diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index c71e91b..a8fe478 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2202,7 +2202,7 @@ ftrace_regex_write(struct file *file, const char __user *ubuf, struct trace_parser *parser; ssize_t ret, read; - if (!cnt || cnt < 0) + if (!cnt) return 0; mutex_lock(&ftrace_regex_lock); @@ -2216,7 +2216,7 @@ ftrace_regex_write(struct file *file, const char __user *ubuf, parser = &iter->parser; read = trace_get_user(parser, ubuf, cnt, ppos); - if (trace_parser_loaded(parser) && + if (read >= 0 && trace_parser_loaded(parser) && !trace_parser_cont(parser)) { ret = ftrace_process_regex(parser->buffer, parser->idx, enable); @@ -2552,8 +2552,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_parser parser; - size_t read = 0; - ssize_t ret; + ssize_t read, ret; if (!cnt || cnt < 0) return 0; @@ -2572,7 +2571,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf, read = trace_get_user(&parser, ubuf, cnt, ppos); - if (trace_parser_loaded((&parser))) { + if (read >= 0 && trace_parser_loaded((&parser))) { parser.buffer[parser.idx] = 0; /* we allow only one expression at a time */ diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 6f03c8a..d128f65 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -232,10 +232,9 @@ ftrace_event_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_parser parser; - size_t read = 0; - ssize_t ret; + ssize_t read, ret; - if (!cnt || cnt < 0) + if (!cnt) return 0; ret = tracing_update_buffers(); @@ -247,7 +246,7 @@ ftrace_event_write(struct file *file, const char __user *ubuf, read = trace_get_user(&parser, ubuf, cnt, ppos); - if (trace_parser_loaded((&parser))) { + if (read >= 0 && trace_parser_loaded((&parser))) { int set = 1; if (*parser.buffer == '!') -- cgit v1.1 From 1eb90f138b3fb4cc15f3acec94aa788e846269f7 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 22 Sep 2009 13:52:57 +0800 Subject: tracing: Fix failure path in ftrace_graph_write() Don't call trace_parser_put() on uninitialized trace_parser. Signed-off-by: Li Zefan Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Steven Rostedt LKML-Reference: <4AB86639.3000003@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- kernel/trace/ftrace.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'kernel') diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index a8fe478..5c5cb9b 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2561,12 +2561,12 @@ ftrace_graph_write(struct file *file, const char __user *ubuf, if (ftrace_graph_count >= FTRACE_GRAPH_MAX_FUNCS) { ret = -EBUSY; - goto out; + goto out_unlock; } if (trace_parser_get_init(&parser, FTRACE_BUFF_MAX)) { ret = -ENOMEM; - goto out; + goto out_unlock; } read = trace_get_user(&parser, ubuf, cnt, ppos); @@ -2578,12 +2578,14 @@ ftrace_graph_write(struct file *file, const char __user *ubuf, ret = ftrace_set_func(ftrace_graph_funcs, &ftrace_graph_count, parser.buffer); if (ret) - goto out; + goto out_free; } ret = read; - out: + +out_free: trace_parser_put(&parser); +out_unlock: mutex_unlock(&graph_lock); return ret; -- cgit v1.1 From 79fe249c8368be35c9ca05982e80c68e959505e1 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 22 Sep 2009 13:54:28 +0800 Subject: tracing: Fix failure path in ftrace_regex_open() Don't forget to free trace_parser if seq_open() returned failure. Signed-off-by: Li Zefan Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Steven Rostedt LKML-Reference: <4AB86694.4040803@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- kernel/trace/ftrace.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 5c5cb9b..e70af98 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1621,8 +1621,10 @@ ftrace_regex_open(struct inode *inode, struct file *file, int enable) if (!ret) { struct seq_file *m = file->private_data; m->private = iter; - } else + } else { + trace_parser_put(&iter->parser); kfree(iter); + } } else file->private_data = iter; mutex_unlock(&ftrace_regex_lock); -- cgit v1.1 From 115e8a288252ef748f34f8b7c1115c563d702eda Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 21 Sep 2009 18:22:11 +0200 Subject: modules, tracing: Remove stale struct marker signature from module_layout() Linus reported this new build warning: kernel/module.c:2951: warning: ?struct marker? declared inside parameter list kernel/module.c:2951: warning: its scope is only this definition or declaration, which is probably not what you want Caused by: fc53776: tracing: Remove markers module_layout() is an artificial symbol with 'significant' symbols listed in its argument list so that it gets a proper argument types signature that modversions can pick up to decide whether a module is version-compatible or not. If these dont match then we wont even look at a module. Remove the stale marker symbol. Reported-by: Linus Torvalds LKML-Reference: Cc: Christoph Hellwig Cc: Mathieu Desnoyers Cc: Steven Rostedt Cc: Frederic Weisbecker Cc: Rusty Russell Signed-off-by: Ingo Molnar --- kernel/module.c | 1 - 1 file changed, 1 deletion(-) (limited to 'kernel') diff --git a/kernel/module.c b/kernel/module.c index b6ee424..392eb3d 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2947,7 +2947,6 @@ void module_layout(struct module *mod, struct modversion_info *ver, struct kernel_param *kp, struct kernel_symbol *ks, - struct marker *marker, struct tracepoint *tp) { } -- cgit v1.1