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Mon, 18 Nov 2019 21:05:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574111130; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qM1nb36WuoLn5iPpv5w4jChgKX8iZnVU50qCjKMKGUE=; b=OkzQ0IpitUwU7yjpmdh2Lm2W3BVpxTp2VDsDeNuwkIrRkrc8wtED3CfPIr88qJqUTkBO5I 3cjWgYj85iQ329aF3T+kd5l7m8YJmc4QNx7FfkZloOPkK0D7Cd2fF0dE/moH7lIhZXQepR qwpwTFOl+npNMvPfjC8hrqikM0UMNL4= From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: Eric Blake , qemu-devel@nongnu.org Subject: [PATCH-for-4.2 v3 3/3] trace: Forbid dynamic field width in event format Date: Mon, 18 Nov 2019 22:04:58 +0100 Message-Id: <20191118210458.11959-4-philmd@redhat.com> In-Reply-To: <20191118210458.11959-1-philmd@redhat.com> References: <20191118210458.11959-1-philmd@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-MC-Unique: znd8cBw2N-KFvJlsNK483w-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Stefan Hajnoczi , qemu-block@nongnu.org, qemu-trivial@nongnu.org, Max Reitz , Aleksandar Markovic , Aleksandar Rikalo , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Aurelien Jarno Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" 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 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 =3D 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 cont= ain field width '%*' Reported-by: Eric Blake Buglink: https://bugs.launchpad.net/qemu/+bug/1844817 Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- v3: - use better regex provided by Eric, - instead of re.match(), use re.search() which takes unanchored regex, - added a comment in tracing.txt --- docs/devel/tracing.txt | 3 ++- scripts/tracetool/__init__.py | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/docs/devel/tracing.txt b/docs/devel/tracing.txt index 8c0376fefa..6c01ce801e 100644 --- a/docs/devel/tracing.txt +++ b/docs/devel/tracing.txt @@ -113,7 +113,8 @@ Format strings should reflect the types defined in the = trace event. Take special care to use PRId64 and PRIu64 for int64_t and uint64_t types, respectively. This ensures portability between 32- and 64-bit platforms. Format strings must not end with a newline character. It is the responsib= ility -of backends to adapt line ending for proper logging. +of backends to adapt line ending for proper logging. Format strings must = not +use numeric field width dynamic precision (SystemTap does not support them= ). =20 Each event declaration will start with the event name, then its arguments, finally a format string for pretty-printing. For example: diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py index 44c118bc2a..ec7fe9fa4a 100644 --- a/scripts/tracetool/__init__.py +++ b/scripts/tracetool/__init__.py @@ -206,6 +206,7 @@ class Event(object): "\s*" "(?:(?:(?P\".+),)?\s*(?P\".+))?" "\s*") + _DFWRE =3D re.compile(r"%[\d\.\- +#']*\*") # dynamic width precision =20 _VALID_PROPS =3D set(["disable", "tcg", "tcg-trans", "tcg-exec", "vcpu= "]) =20 @@ -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.search(fmt): + raise ValueError("Event format must not contain field width '%= *'") =20 if len(fmt_trans) > 0: fmt =3D [fmt_trans, fmt] --=20 2.21.0