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Fix overflow in prng_range().

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Add jemalloc_ffs64() and use it instead of jemalloc_ffsl() in
prng_range(), since long is not guaranteed to be a 64-bit type.
This commit is contained in:
Jason Evans
2016-02-20 23:41:33 -08:00
parent aac93f414e
commit ecae12323d
5 changed files with 40 additions and 6 deletions
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14
configure.ac
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@@ -201,6 +201,16 @@ else
fi
AC_DEFINE_UNQUOTED([LG_SIZEOF_LONG], [$LG_SIZEOF_LONG])
AC_CHECK_SIZEOF([long long])
if test "x${ac_cv_sizeof_long_long}" = "x8" ; then
LG_SIZEOF_LONG_LONG=3
elif test "x${ac_cv_sizeof_long_long}" = "x4" ; then
LG_SIZEOF_LONG_LONG=2
else
AC_MSG_ERROR([Unsupported long long size: ${ac_cv_sizeof_long_long}])
fi
AC_DEFINE_UNQUOTED([LG_SIZEOF_LONG_LONG], [$LG_SIZEOF_LONG_LONG])
AC_CHECK_SIZEOF([intmax_t])
if test "x${ac_cv_sizeof_intmax_t}" = "x16" ; then
LG_SIZEOF_INTMAX_T=4
@@ -1040,7 +1050,7 @@ dnl ============================================================================
dnl Check for __builtin_ffsl(), then ffsl(3), and fail if neither are found.
dnl One of those two functions should (theoretically) exist on all platforms
dnl that jemalloc currently has a chance of functioning on without modification.
dnl We additionally assume ffs() or __builtin_ffs() are defined if
dnl We additionally assume ffs[ll]() or __builtin_ffs[ll]() are defined if
dnl ffsl() or __builtin_ffsl() are defined, respectively.
JE_COMPILABLE([a program using __builtin_ffsl], [
#include <stdio.h>
@@ -1053,6 +1063,7 @@ JE_COMPILABLE([a program using __builtin_ffsl], [
}
], [je_cv_gcc_builtin_ffsl])
if test "x${je_cv_gcc_builtin_ffsl}" = "xyes" ; then
AC_DEFINE([JEMALLOC_INTERNAL_FFSLL], [__builtin_ffsll])
AC_DEFINE([JEMALLOC_INTERNAL_FFSL], [__builtin_ffsl])
AC_DEFINE([JEMALLOC_INTERNAL_FFS], [__builtin_ffs])
else
@@ -1067,6 +1078,7 @@ else
}
], [je_cv_function_ffsl])
if test "x${je_cv_function_ffsl}" = "xyes" ; then
AC_DEFINE([JEMALLOC_INTERNAL_FFSLL], [ffsll])
AC_DEFINE([JEMALLOC_INTERNAL_FFSL], [ffsl])
AC_DEFINE([JEMALLOC_INTERNAL_FFS], [ffs])
else