- Improve bash $RANDOM pseudo RNG (bug #234906)
This commit is contained in:
Pete Graner
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336cfbb57f
commit
ab4ea8c3a2
169
bash-3.2-rng.patch
Normal file
169
bash-3.2-rng.patch
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@ -0,0 +1,169 @@
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--- bash-3.2/configure.in.rng 2007-04-05 11:07:40.000000000 +0200
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+++ bash-3.2/configure.in 2007-04-05 11:07:41.000000000 +0200
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@@ -111,6 +111,7 @@
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AC_ARG_WITH(installed-readline, AC_HELP_STRING([--with-installed-readline], [use a version of the readline library that is already installed]), opt_with_installed_readline=$withval)
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AC_ARG_WITH(purecov, AC_HELP_STRING([--with-purecov], [configure to postprocess with pure coverage]), opt_purecov=$withval)
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AC_ARG_WITH(purify, AC_HELP_STRING([--with-purify], [configure to postprocess with purify]), opt_purify=$withval)
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+AC_ARG_WITH(random, AC_HELP_STRING([--with-randomdev=path], [use specified random device instead of /dev/urandom]), opt_randomdev=$withval)
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if test "$opt_bash_malloc" = yes; then
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MALLOC_TARGET=malloc
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@@ -152,6 +153,15 @@
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DEBUGGER_START_FILE=${ac_default_prefix}/share/bashdb/bashdb-main.inc
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fi
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+if test "$opt_randomdev" = yes -o -z "$opt_randomdev"; then
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+ opt_randomdev="/dev/urandom"
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+elif test "$opt_randomdev" = no; then
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+ opt_randomdev=
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+fi
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+if test -n "$opt_randomdev"; then
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+ AC_DEFINE_UNQUOTED(PATH_RANDOMDEV, "$opt_randomdev", [Random device path.])
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+fi
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+
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dnl optional shell features in config.h.in
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opt_minimal_config=no
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@@ -708,6 +718,8 @@
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setenv setlinebuf setlocale setvbuf siginterrupt strchr \
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sysconf tcgetattr times ttyname tzset unsetenv)
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+AC_CHECK_FUNCS(random srandom)
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+
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AC_CHECK_FUNCS(vsnprintf snprintf vasprintf asprintf)
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AC_CHECK_FUNCS(isascii isblank isgraph isprint isspace isxdigit)
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AC_CHECK_FUNCS(getpwent getpwnam getpwuid)
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--- bash-3.2/config.h.in.rng 2007-04-05 11:07:40.000000000 +0200
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+++ bash-3.2/config.h.in 2007-04-05 11:07:41.000000000 +0200
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@@ -203,6 +203,8 @@
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#define DEFAULT_MAIL_DIRECTORY "/var/spool/mail"
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+#undef PATH_RANDOMDEV
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+
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/* Characteristics of the system's header files and libraries that affect
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the compilation environment. */
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@@ -815,6 +817,10 @@
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/* Define if you have the wcwidth function. */
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#undef HAVE_WCWIDTH
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+#undef HAVE_RANDOM
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+
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+#undef HAVE_SRANDOM
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+
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/* Presence of certain system include files. */
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/* Define if you have the <arpa/inet.h> header file. */
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--- bash-3.2/variables.c.rng 2006-09-08 19:33:32.000000000 +0200
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+++ bash-3.2/variables.c 2007-04-05 11:53:03.000000000 +0200
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@@ -42,6 +42,11 @@
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#include "bashansi.h"
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#include "bashintl.h"
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+#if defined (PATH_RANDOMDEV)
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+# include <errno.h>
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+# include "filecntl.h"
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+#endif
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+
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#include "shell.h"
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#include "flags.h"
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#include "execute_cmd.h"
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@@ -182,7 +187,8 @@
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static SHELL_VAR *init_seconds_var __P((void));
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static int brand __P((void));
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-static void sbrand __P((unsigned long)); /* set bash random number generator. */
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+static void sbrand __P((unsigned int)); /* set bash random number generator. */
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+static void seed_random __P((void)); /* seed the generator randomly */
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static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t));
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static SHELL_VAR *get_random __P((SHELL_VAR *));
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@@ -495,7 +501,7 @@
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#endif /* HISTORY */
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/* Seed the random number generator. */
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- sbrand (dollar_dollar_pid + shell_start_time);
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+ seed_random();
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/* Handle some "special" variables that we may have inherited from a
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parent shell. */
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@@ -1143,7 +1149,9 @@
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}
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/* The random number seed. You can change this by setting RANDOM. */
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+#if !defined (HAVE_RANDOM)
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static unsigned long rseed = 1;
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+#endif
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static int last_random_value;
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static int seeded_subshell = 0;
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@@ -1155,26 +1163,56 @@
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static int
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brand ()
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{
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+#if defined (HAVE_RANDOM)
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+ unsigned int rseed;
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+ rseed = random();
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+#else
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rseed = rseed * 1103515245 + 12345;
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+#endif
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return ((unsigned int)((rseed >> 16) & 32767)); /* was % 32768 */
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}
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-
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/* Set the random number generator seed to SEED. */
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static void
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sbrand (seed)
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- unsigned long seed;
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+ unsigned int seed;
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{
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+#if defined (HAVE_RANDOM)
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+ srandom((unsigned int)seed);
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+#else
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rseed = seed;
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+#endif
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last_random_value = 0;
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}
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+static void
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+seed_random ()
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+{
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+ unsigned int seed;
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+#if defined (PATH_RANDOMDEV)
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+ int fd;
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+ int rv;
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+ if ((rv = fd = open (PATH_RANDOMDEV, O_RDONLY)) != -1) {
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+ while ((rv = read(fd, &seed, sizeof(seed))) != sizeof(seed) && errno == EINTR);
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+ close (fd);
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+ }
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+ if (rv != sizeof(seed)) {
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+#endif
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+ struct timeval tv;
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+ gettimeofday(&tv, NULL);
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+ seed = (unsigned int)tv.tv_sec + (unsigned int)tv.tv_usec + getpid();
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+#if defined (PATH_RANDOMDEV)
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+ }
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+#endif
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+ sbrand (seed);
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+}
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+
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static SHELL_VAR *
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assign_random (self, value, unused)
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SHELL_VAR *self;
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char *value;
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arrayind_t unused;
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{
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- sbrand (strtoul (value, (char **)NULL, 10));
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+ sbrand ((unsigned int)strtoul (value, (char **)NULL, 10));
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if (subshell_environment)
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seeded_subshell = 1;
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return (self);
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@@ -1188,7 +1226,7 @@
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/* Reset for command and process substitution. */
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if (subshell_environment && seeded_subshell == 0)
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{
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- sbrand (rseed + getpid() + NOW);
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+ seed_random ();
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seeded_subshell = 1;
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}
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@ -1,7 +1,7 @@
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Version: 3.2
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Name: bash
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Summary: The GNU Bourne Again shell (bash) version %{version}
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Release: 12%{?dist}
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Release: 13%{?dist}
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Group: System Environment/Shells
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License: GPL
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Url: http://www.gnu.org/software/bash
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@ -44,6 +44,7 @@ Patch126: bash-setlocale.patch
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Patch130: bash-infotags.patch
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Patch131: bash-cond-rmatch.patch
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Patch132: bash-ulimit-m.patch
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Patch131: bash-3.2-rng.patch
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Requires: mktemp
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Requires(post): ncurses
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BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
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@ -97,6 +98,7 @@ compliance over previous versions.
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%patch130 -p1 -b .infotags
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%patch131 -p1 -b .cond-rmatch
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%patch132 -p1 -b .ulimit-m
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%patch131 -p1 -b .rng.patch
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echo %{version} > _distribution
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echo %{release} > _patchlevel
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@ -238,6 +240,9 @@ fi
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%doc doc/*.ps doc/*.0 doc/*.html doc/article.txt
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%changelog
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* Wed Aug 15 2007 Pete Graner <pgraner@redhat.com> - 3.2-13
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- Improve bash $RANDOM pseudo RNG (bug #234906)
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* Fri Jul 20 2007 Tim Waugh <twaugh@redhat.com> 3.2-12
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- Quote environment variables in the post scriptlet to prevent upgrade
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failures (bug #249005).
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