From nobody Mon Oct 6 03:15:55 2025 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 871302DE6ED for ; Fri, 25 Jul 2025 10:21:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.71 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753438887; cv=none; b=W0tozPXeyOViOaMNUUX4LMdVzDWcgOuWp/puMuITafxsQq3Y4gsuNHgmc3lhvbkXRCYTHK9qQQUF/4l0EcYBSr24np/5A+FnnAmmsvYvLwN7IBVNf8HJzeLGrPPjx3W85GOzo4EDfI2CyeFPC1+yyie1bU90r832GDamvCy0MCo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753438887; c=relaxed/simple; bh=nS8sBQa5W/Du5q+hZRKZYwOkT4zNovYlUbG6dkuIPsw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=noJLdnUR+vr1PF5Ys7YelHdugK/zvRyC4jqeHZ8Kk50DdnszjwcnER7WJ4TLoJ2uwcN9M+6brxskUTHUZHjHTVpOrfMLJhYCqrAZlABkvbUirQDe2Ll/cOPANdZXmftIhqvPyqzmfLp/vwK9SWQdJ1opBtUdmKFIZXlla1JvHNY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-io1-f71.google.com with SMTP id ca18e2360f4ac-86463467dddso216783739f.3 for ; Fri, 25 Jul 2025 03:21:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1753438884; x=1754043684; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YfjMseACJajmFQUWdcr1KnZtp3lHOyTwsF7P7BpdQfY=; b=V34T7Ug4h2q6JYJ6hKM0rc6e+M9Dxvy5md4Mee6yqSxuc4hgIAIm/6cfAAJJko40eH WsigPFSENooHewYxlXPrRh+IurY2CNzdyAET36MCQWVwZi9QjMf8dT0SxhioR7wTuNfb ql0nGCkNJKaR9Fg8a5lm6WTVKkdphbw8KBvyJioHziHc2WkXN6dLk89VlgYL8QHdor/3 +VaKL1zrKIcnnLsy+0nRZvHeJbnIFpADVo4rfF7eAeuzoi0X2mLfPvQtAVIAYJ7MC5eG vTw5kMz9ZpY2gNIUiocLMAQGIogOWBoQTc+m1YB0kiu2E9ejBsjlaimaskszV41tqxE+ XPJg== X-Gm-Message-State: AOJu0YxNVuLfL9kMupQ4kJBSJiIndVLgclaPJDgLwQIj9d+/u0cl1A/3 /xaDykuQ38yUXhiuIEwzecKDOoglgv3UBC1D5PqgN1Yt2w4YxuZvY+aLD54lxOPgmBl80KafjaQ vgyZ2w9PLkTbM3konhv0VLuHiMPcav87HsESHSBua1oDt4V7KDMnDX4ssruU= X-Google-Smtp-Source: AGHT+IEgcKSv1TWOmsJIRwNaDIGzUVlitUUTaFLXBhGXTDthK7qxMHkqRAebc54OVFzXRa5hFMkfRc6umffQW4VLcFFRL+O65nem Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:97:b0:3df:2f47:dc21 with SMTP id e9e14a558f8ab-3e3c531f82cmr19006645ab.22.1753438884669; Fri, 25 Jul 2025 03:21:24 -0700 (PDT) Date: Fri, 25 Jul 2025 03:21:24 -0700 In-Reply-To: <68794b99.a70a0220.693ce.0053.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68835aa4.a00a0220.2f88df.0043.GAE@google.com> Subject: Forwarded: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in do_insn_ioctl From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in do_insn_ioctl Author: abbotti@mev.co.uk #syz test diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c index 23b7178522ae..360fde417016 100644 --- a/drivers/comedi/comedi_fops.c +++ b/drivers/comedi/comedi_fops.c @@ -1587,6 +1587,10 @@ static int do_insnlist_ioctl(struct comedi_device *d= ev, memset(&data[n], 0, (MIN_SAMPLES - n) * sizeof(unsigned int)); } + } else { + unsigned int n_min =3D max(n, (unsigned int)MIN_SAMPLES); + + memset(data, 0, n_min * sizeof(unsigned int)); } ret =3D parse_insn(dev, insns + i, data, file); if (ret < 0) @@ -1670,6 +1674,8 @@ static int do_insn_ioctl(struct comedi_device *dev, memset(&data[insn->n], 0, (MIN_SAMPLES - insn->n) * sizeof(unsigned int)); } + } else { + memset(data, 0, n_data * sizeof(unsigned int)); } ret =3D parse_insn(dev, insn, data, file); if (ret < 0)