Date: Sun, 5 Oct 2003 05:26:19 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: bms@FreeBSD.org Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_sysctl.c Message-ID: <200310051226.h95CQJN1049247@gw.catspoiler.org> In-Reply-To: <200310050937.h959bldI091908@repoman.freebsd.org>
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On 5 Oct, Bruce M Simpson wrote: > bms 2003/10/05 02:37:47 PDT > > FreeBSD src repository > > Modified files: > sys/kern kern_sysctl.c > Log: > Fix a security problem in sysctl() the long way round. > > Use pre-emption detection to avoid the need for wiring a userland buffer > when copying opaque data structures. In the SMP case the data can change even without pre-emption. There have been a number of discussions (arch@, smp@, arch-handbook, etc.) about adding a mutex parameter to the sysctl API. Someone even submitted a PR with a patch a few months ago (kern/54439), which I had hoped to review but never found the time to.
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