Date: Sun, 30 May 2021 20:43:01 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Fas Xmut <fasxmut@protonmail.com>, "freebsd-security@freebsd.org" <freebsd-security@freebsd.org> Subject: Re: sysrc (awk) bug Message-ID: <ae413c70-4fdc-f65c-1757-b1473c1a21b7@grosbein.net> In-Reply-To: <0J-hkv9PO-ZfjHO2kiEVatVRNdz0xTZ8pDMOvPreE53RFRsgyWHnU0U1IPO-mxNmswiB5KyGgO067-gLMA0PfW4Py3bBYllvQCBMTc2T8QE=@protonmail.com> References: <0J-hkv9PO-ZfjHO2kiEVatVRNdz0xTZ8pDMOvPreE53RFRsgyWHnU0U1IPO-mxNmswiB5KyGgO067-gLMA0PfW4Py3bBYllvQCBMTc2T8QE=@protonmail.com>
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30.05.2021 11:36, Fas Xmut via freebsd-security wrote: > I don't know if it is a security bug or not. When I use sysrc today, the error operations emptied my /etc/rc.conf, that's a small disaster, because my /etc/rc.conf is updated day by day, but now, it is empty. > > First, change your default root shell to sh/ksh or their derived shell. (I have tested, csh will not trigger that bug). > > Second, backup /etc/rc.conf to any other place. > > Then do the following commands: > > ------------------------------------------------------------------------ > # sysrc something_enable="NO" > # sysrc something_enable="YES >> " > awk: newline in string YES > ... at source line 1 > something_enable: NO -> YES > ------------------------------------------------------------------------ > > Now see what is inside /etc/rc.conf ? Everything is empty! only one thing in it: > > ------------------------------------------------------------------------ > something_enable="YES > " > ------------------------------------------------------------------------ What is your FreeBSD version?
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