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Fri, 8 Nov 2019 14:27:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1573223291; 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=E/RURPPC+PX0XGwf6Gei0vsDMgKrYkulMKMaEFtT6vg=; b=hwNfxoCG20qK2+ccJEc8HDAQ0TmEqniqAm2sU6NgvM9SAYMXVoPxg59l3v0NGfm9LHpoXD vtbld74f0vG+AZ16E5j8LttXO27SKyOs8Sg+FITjmgA5XURFmbS55rzN5EKIJ6yEp/IVkr /fnLaXyZb94U6B6iZ1b0/Vcdkj89d3A= From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org, Eric Blake Subject: [PATCH 3/3] trace: Forbid dynamic field width in event format Date: Fri, 8 Nov 2019 15:26:13 +0100 Message-Id: <20191108142613.26649-4-philmd@redhat.com> In-Reply-To: <20191108142613.26649-1-philmd@redhat.com> References: <20191108142613.26649-1-philmd@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: zuoahBc_MPycoNJQw0dZ0A-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: 207.211.31.81 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 --- 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\".+),)?\s*(?P\".+))?" "\s*") + _DFWRE =3D re.compile(".*(%0?\*).*") =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.match(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