linux-kernel - Re: [PATCH] perf trace: Handle legacy syscalls

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 20 Mar 2015 13:06:40 -0300
From:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] perf trace: Handle legacy syscalls

Em Fri, Mar 20, 2015 at 09:48:10AM -0600, David Ahern escreveu:
> On 3/20/15 9:32 AM, Arnaldo Carvalho de Melo wrote:
> >But then I don't think we need to do that, i.e. we can just have a
> >boolean we set at some point to tell that we need to skip the first
> >entry.
> >
> >I'll try to cook up a patch for that.
> 
> why have a boolean that is checked every time through the loop when its
> value will always be the same for a give run? why not just remove the entry
> as I suggested?

First gut reaction was: hey, we got that from a library, libtraceevent,
that could have other users, etc, better not to change it behind its
back.

I.e. something like this, based on your approach, but not modifying the
data structures received from libtraceevent:

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 6af6bcec930e..001c6ae9a1b1 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1135,6 +1135,8 @@ static struct syscall_fmt *syscall_fmt__find(const char *name)
 
 struct syscall {
 	struct event_format *tp_format;
+	int		    nr_args;
+	struct format_field *args;
 	const char	    *name;
 	bool		    filtered;
 	bool		    is_exit;
@@ -1442,14 +1444,14 @@ static int syscall__set_arg_fmts(struct syscall *sc)
 	struct format_field *field;
 	int idx = 0;
 
-	sc->arg_scnprintf = calloc(sc->tp_format->format.nr_fields - 1, sizeof(void *));
+	sc->arg_scnprintf = calloc(sc->nr_args, sizeof(void *));
 	if (sc->arg_scnprintf == NULL)
 		return -1;
 
 	if (sc->fmt)
 		sc->arg_parm = sc->fmt->arg_parm;
 
-	for (field = sc->tp_format->format.fields->next; field; field = field->next) {
+	for (field = sc->args; field; field = field->next) {
 		if (sc->fmt && sc->fmt->arg_scnprintf[idx])
 			sc->arg_scnprintf[idx] = sc->fmt->arg_scnprintf[idx];
 		else if (field->flags & FIELD_IS_POINTER)
@@ -1515,6 +1517,14 @@ static int trace__read_syscall_info(struct trace *trace, int id)
 	if (sc->tp_format == NULL)
 		return -1;
 
+	sc->args = sc->tp_format->format.fields;
+	sc->nr_args = sc->tp_format->format.nr_fields;
+	/* drop nr field - not relevant here; does not exist on older kernels */
+	if (sc->args && strcmp(sc->args->name, "nr") == 0) {
+		sc->args = sc->args->next;
+		--sc->nr_args;
+	}
+
 	sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");
 
 	return syscall__set_arg_fmts(sc);
@@ -1537,7 +1547,7 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
 	unsigned char *p;
 	unsigned long val;
 
-	if (sc->tp_format != NULL) {
+	if (sc->args != NULL) {
 		struct format_field *field;
 		u8 bit = 1;
 		struct syscall_arg arg = {
@@ -1547,7 +1557,7 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
 			.thread = thread,
 		};
 
-		for (field = sc->tp_format->format.fields->next; field;
+		for (field = sc->args; field;
 		     field = field->next, ++arg.idx, bit <<= 1) {
 			if (arg.mask & bit)
 				continue;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/