Linux-Trace-Devel Archive on lore.kernel.org
 help / color / Atom feed
From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org, linux-trace-devel@vger.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, Jaewon Kim <jaewon31.kim@samsung.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Kees Cook <keescook@chromium.org>
Subject: [PATCH 2/3] tools lib traceevent: Handle __attribute__((user)) in field names
Date: Tue, 24 Mar 2020 16:08:47 -0400
Message-ID: <20200324200956.663647256@goodmis.org> (raw)
In-Reply-To: <20200324200845.763565368@goodmis.org>

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Commit c61f13eaa1ee1 ("gcc-plugins: Add structleak for more stack
initialization") added "__attribute__((user))" to the user when stackleak
detector is enabled. This now appears in the field format of system call
trace events for system calls that have user buffers. The
"__attribute__((user))" breaks the parsing in libtraceevent. That needs to
be handled.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tools/lib/traceevent/event-parse.c | 39 +++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index eec96c31ea9e..010e60d5a081 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -1444,6 +1444,7 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
 	enum tep_event_type type;
 	char *token;
 	char *last_token;
+	char *delim = " ";
 	int count = 0;
 	int ret;
 
@@ -1504,13 +1505,49 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
 					field->flags |= TEP_FIELD_IS_POINTER;
 
 				if (field->type) {
-					ret = append(&field->type, " ", last_token);
+					ret = append(&field->type, delim, last_token);
 					free(last_token);
 					if (ret < 0)
 						goto fail;
 				} else
 					field->type = last_token;
 				last_token = token;
+				delim = " ";
+				continue;
+			}
+
+			/* Handle __attribute__((user)) */
+			if ((type == TEP_EVENT_DELIM) &&
+			    strcmp("__attribute__", last_token) == 0 &&
+			    token[0] == '(') {
+				int depth = 1;
+				int ret;
+
+				ret = append(&field->type, " ", last_token);
+				ret |= append(&field->type, "", "(");
+				if (ret < 0)
+					goto fail;
+
+				delim = " ";
+				while ((type = read_token(&token)) != TEP_EVENT_NONE) {
+					if (type == TEP_EVENT_DELIM) {
+						if (token[0] == '(')
+							depth++;
+						else if (token[0] == ')')
+							depth--;
+						if (!depth)
+							break;
+						ret = append(&field->type, "", token);
+						delim = "";
+					} else {
+						ret = append(&field->type, delim, token);
+						delim = " ";
+					}
+					if (ret < 0)
+						goto fail;
+					free(last_token);
+					last_token = token;
+				}
 				continue;
 			}
 			break;
-- 
2.25.1



  parent reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24 20:08 [PATCH 0/3] tool lib traceevent: Fix some parsing errors Steven Rostedt
2020-03-24 20:08 ` [PATCH 1/3] tools lib traceevent: Add append() function helper for appending strings Steven Rostedt
2020-03-24 20:08 ` Steven Rostedt [this message]
2020-03-24 20:08 ` [PATCH 3/3] tools lib traceevent: Add handler for __builtin_expect() Steven Rostedt

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200324200956.663647256@goodmis.org \
    --to=rostedt@goodmis.org \
    --cc=acme@kernel.org \
    --cc=akpm@linux-foundation.org \
    --cc=jaewon31.kim@samsung.com \
    --cc=jolsa@redhat.com \
    --cc=keescook@chromium.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux-trace-devel@vger.kernel.org \
    --cc=mingo@kernel.org \
    --cc=namhyung@kernel.org \
    --cc=vbabka@suse.cz \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Trace-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-trace-devel/0 linux-trace-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-trace-devel linux-trace-devel/ https://lore.kernel.org/linux-trace-devel \
		linux-trace-devel@vger.kernel.org
	public-inbox-index linux-trace-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-trace-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git