Author: pfg
Date: Sun Feb 22 01:32:37 2015
New Revision: 279130
URL: https://svnweb.freebsd.org/changeset/base/279130
Log:
MFC r278803, r278905:
ulimit(3): Fix broken check.
The existing implementation had a broken comparison that could
overflow and return confusing values. 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().
New revamped version is credited to Bruce Evans.
CID: 1199295
Modified:
stable/9/lib/libc/gen/ulimit.c
Directory Properties:
stable/9/lib/libc/ (props changed)
Modified: stable/9/lib/libc/gen/ulimit.c
==============================================================================
--- stable/9/lib/libc/gen/ulimit.c Sun Feb 22 01:31:28 2015
(r279129)
+++ stable/9/lib/libc/gen/ulimit.c Sun Feb 22 01:32:37 2015
(r279130)
@@ -40,7 +40,7 @@ ulimit(int cmd, ...)
{
struct rlimit limit;
va_list ap;
- long arg;
+ rlim_t arg;
if (cmd == UL_GETFSIZE) {
if (getrlimit(RLIMIT_FSIZE, &limit) == -1)
@@ -53,14 +53,16 @@ ulimit(int cmd, ...)
va_start(ap, cmd);
arg = va_arg(ap, long);
va_end(ap);
- limit.rlim_max = limit.rlim_cur = (rlim_t)arg * 512;
+ if (arg < 0)
+ arg = LONG_MAX;
+ if (arg > RLIM_INFINITY / 512)
+ arg = RLIM_INFINITY / 512;
+ limit.rlim_max = limit.rlim_cur = 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);
+ return ((long)arg);
} else {
errno = EINVAL;
return (-1);
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