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Date: Thu, 24 Apr 2014 18:14:48 +0200 From: "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com> To: Jan Kara <jack@...e.cz> Cc: Heinrich Schuchardt <xypron.glpk@....de>, Eric Paris <eparis@...hat.com>, lkml <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/1] fanotify: check permissions when creating file descriptor >> This means a listener may have read authorization for /home and mark >> this mount. >> Afterwards, while you sign a git tag, it will receive a FAN_OPEN event >> and use the file descriptor supplied in the event to overwrite your >> /home/jankara/.gnupg/secring.pgp >> though the file is chmod 600 and the listener is neither root nor you. > Ah, right. Thanks for explaining this to me. I'm not really too excited > about this as a security issue because once the process has CAP_SYS_ADMIN > it basically owns the machine (it is sadly one of those capabilities which > is too broad) Yup. https://lwn.net/Articles/486306/ > but I agree checking permissions when creating the fd is > reasonable. > > Honza > -- > Jan Kara <jack@...e.cz> > SUSE Labs, CR -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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