From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: qemu-devel@nongnu.org, Eric Blake <eblake@redhat.com>
Cc: "Kevin Wolf" <kwolf@redhat.com>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
qemu-block@nongnu.org, qemu-trivial@nongnu.org,
"Max Reitz" <mreitz@redhat.com>,
"Aleksandar Markovic" <amarkovic@wavecomp.com>,
"Aleksandar Rikalo" <aleksandar.rikalo@rt-rk.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>,
"Aurelien Jarno" <aurelien@aurel32.net>
Subject: [PATCH 3/3] trace: Forbid dynamic field width in event format
Date: Fri, 8 Nov 2019 15:26:13 +0100 [thread overview]
Message-ID: <20191108142613.26649-4-philmd@redhat.com> (raw)
In-Reply-To: <20191108142613.26649-1-philmd@redhat.com>
Since not all trace backends support dynamic field width in
format (dtrace via stap does not), forbid them.
Add a check to refuse field width in new formats:
$ make
[...]
GEN hw/block/trace.h
Traceback (most recent call last):
File "scripts/tracetool.py", line 152, in <module>
main(sys.argv)
File "scripts/tracetool.py", line 143, in main
events.extend(tracetool.read_events(fh, arg))
File "scripts/tracetool/__init__.py", line 371, in read_events
event = Event.build(line)
File "scripts/tracetool/__init__.py", line 285, in build
raise ValueError("Event format must not contain field width '%*'")
ValueError: Error at hw/block/trace-events:11: Event format must not contain field width '%*'
Reported-by: Eric Blake <eblake@redhat.com>
Buglink: https://bugs.launchpad.net/qemu/+bug/1844817
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
scripts/tracetool/__init__.py | 3 +++
1 file changed, 3 insertions(+)
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 44c118bc2a..e239be602b 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -206,6 +206,7 @@ class Event(object):
"\s*"
"(?:(?:(?P<fmt_trans>\".+),)?\s*(?P<fmt>\".+))?"
"\s*")
+ _DFWRE = re.compile(".*(%0?\*).*")
_VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec", "vcpu"])
@@ -280,6 +281,8 @@ class Event(object):
if fmt.endswith(r'\n"'):
raise ValueError("Event format must not end with a newline "
"character")
+ if Event._DFWRE.match(fmt):
+ raise ValueError("Event format must not contain field width '%*'")
if len(fmt_trans) > 0:
fmt = [fmt_trans, fmt]
--
2.21.0
prev parent reply other threads:[~2019-11-08 14:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 14:26 [PATCH 0/3] hw: Remove dynamic field width from trace event Philippe Mathieu-Daudé
2019-11-08 14:26 ` [PATCH 1/3] hw/block/pflash: " Philippe Mathieu-Daudé
2019-11-08 14:26 ` [PATCH 2/3] hw/mips/gt64xxx: " Philippe Mathieu-Daudé
2019-11-08 14:36 ` Philippe Mathieu-Daudé
2019-11-08 14:26 ` Philippe Mathieu-Daudé [this message]
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