Date: Fri, 13 Mar 2015 13:44:53 +0100 From: Jann Horn <jann@...jh.net> To: oss-security@...ts.openwall.com Subject: Re: Disabling reading of kernel log buffer reading for user On Fri, Mar 13, 2015 at 09:56:58AM +0000, halfdog wrote: > * What would be the side effects of making /dev/kmesg only root accessible? Maybe syslog not able to write kmessages to log? > * Would it be safe to disable the syslog syscall for action SYSLOG_ACTION_READ_* and all users except root and syslog? Does someone have tested selinux config for that? /proc/sys/kernel/dmesg_restrict can be used to restrict access to the log buffer. It looks like at least rsyslogd uses /proc/kmsg to read messages from the log buffer, and that file is only accessible for root anyway. Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)
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