Date: Sun, 30 May 2021 04:36:45 +0000 From: Fas Xmut <fasxmut@protonmail.com> To: "freebsd-security@freebsd.org" <freebsd-security@freebsd.org> Subject: sysrc (awk) bug Message-ID: <0J-hkv9PO-ZfjHO2kiEVatVRNdz0xTZ8pDMOvPreE53RFRsgyWHnU0U1IPO-mxNmswiB5KyGgO067-gLMA0PfW4Py3bBYllvQCBMTc2T8QE=@protonmail.com>
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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 " ------------------------------------------------------------------------ Sent with [ProtonMail](https://protonmail.com) Secure Email.home | help
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