Date: Thu, 12 Feb 2015 22:27:41 +0000 From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: "Pedro F. Giffuni" <pfg@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r278634 - head/lib/libc/gen Message-ID: <BF5F2941-52F5-41A4-8723-E316919718EE@FreeBSD.org> In-Reply-To: <201502122107.t1CL7gaO004041@svn.freebsd.org> References: <201502122107.t1CL7gaO004041@svn.freebsd.org>
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> On 12 Feb 2015, at 21:07 , Pedro F. Giffuni <pfg@FreeBSD.org> wrote: > > Author: pfg > Date: Thu Feb 12 21:07:42 2015 > New Revision: 278634 > URL: https://svnweb.freebsd.org/changeset/base/278634 > > Log: > ulimit(3): Fix broken check. > > The existing implementation had a broken comparison that could overflow. > Replace this with a check that avoids the overflow before it happens. > > Consistently return a maximum value also on the case of negative > arguments since negative is considered an overflow and means > infinity for our current setrlimit(). > > Discussed with: bde (rather extensively) > Did this compile? > CID: 1199295 > MFC after: 1 week > > Modified: > head/lib/libc/gen/ulimit.c > > Modified: head/lib/libc/gen/ulimit.c > ============================================================================== > --- head/lib/libc/gen/ulimit.c Thu Feb 12 20:57:57 2015 (r278633) > +++ head/lib/libc/gen/ulimit.c Thu Feb 12 21:07:42 2015 (r278634) > @@ -53,13 +53,13 @@ ulimit(int cmd, ...) > va_start(ap, cmd); > arg = va_arg(ap, long); > va_end(ap); > + if (arg > RLIM_INFINITY / 512 || arg < 0) > + arg = RLIM_INFINITY / 512; > limit.rlim_max = limit.rlim_cur = (rlim_t)arg * 512; > > /* The setrlimit() function sets errno to EPERM if needed. */ > if (setrlimit(RLIMIT_FSIZE, &limit) == -1) > return (-1); > - if (arg * 512 > LONG_MAX) > - return (LONG_MAX); > return (arg); > } else { > errno = EINVAL; > — Bjoern A. Zeeb Charles Haddon Spurgeon: "Friendship is one of the sweetest joys of life. Many might have failed beneath the bitterness of their trial had they not found a friend."
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