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Fix nearbyint scheduling of arithmetic past fesetenv (bug 15490).

This commit is contained in:
Joseph Myers 2013-05-19 18:40:25 +00:00
parent db62a90753
commit 3e69426875
7 changed files with 26 additions and 1 deletions
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12
ChangeLog
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@ -1,5 +1,17 @@
2013-05-19 Joseph Myers <joseph@codesourcery.com>
[BZ #15490]
* sysdeps/ieee754/dbl-64/s_nearbyint.c (__nearbyint): Use
math_force_eval before restoring floating-point envrionment.
* sysdeps/ieee754/flt-32/s_nearbyintf.c (__nearbyintf): Likewise.
* sysdeps/ieee754/ldbl-128/s_nearbyintl.c (__nearbyintl):
Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c: Include
<math_private.h>.
(__nearbyintl): Use math_force_eval before restoring
floating-point environment.
* sysdeps/ieee754/ldbl-96/s_nearbyintl.c (__nearbyintl): Likewise.
* math/gen-libm-test.pl (special_functions): Remove.
(parse_args): Don't handle TEST_extra. Handle functions with no
return value.

2
NEWS
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@ -18,7 +18,7 @@ Version 2.18
15305, 15307, 15309, 15327, 15330, 15335, 15336, 15337, 15342, 15346,
15359, 15361, 15366, 15380, 15394, 15395, 15405, 15406, 15409, 15416,
15418, 15419, 15423, 15424, 15426, 15429, 15442, 15448, 15480, 15485,
15488.
15488, 15490.
* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
#15078).

2
sysdeps/ieee754/dbl-64/s_nearbyint.c
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@ -47,6 +47,7 @@ double __nearbyint(double x)
libc_feholdexcept (&env);
w = TWO52[sx]+x;
t = w-TWO52[sx];
math_force_eval (t);
libc_fesetenv (&env);
GET_HIGH_WORD(i0,t);
SET_HIGH_WORD(t,(i0&0x7fffffff)|(sx<<31));
@ -59,6 +60,7 @@ double __nearbyint(double x)
libc_feholdexcept (&env);
w = TWO52[sx]+x;
t = w-TWO52[sx];
math_force_eval (t);
libc_fesetenv (&env);
return t;
}

2
sysdeps/ieee754/flt-32/s_nearbyintf.c
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@ -39,6 +39,7 @@ __nearbyintf(float x)
libc_feholdexceptf (&env);
w = TWO23[sx]+x;
t = w-TWO23[sx];
math_force_eval (t);
libc_fesetenvf (&env);
GET_FLOAT_WORD(i0,t);
SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
@ -51,6 +52,7 @@ __nearbyintf(float x)
libc_feholdexceptf (&env);
w = TWO23[sx]+x;
t = w-TWO23[sx];
math_force_eval (t);
libc_fesetenvf (&env);
return t;
}

2
sysdeps/ieee754/ldbl-128/s_nearbyintl.c
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@ -47,6 +47,7 @@ long double __nearbyintl(long double x)
feholdexcept (&env);
w = TWO112[sx]+x;
t = w-TWO112[sx];
math_force_eval (t);
fesetenv (&env);
GET_LDOUBLE_MSW64(i0,t);
SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
@ -59,6 +60,7 @@ long double __nearbyintl(long double x)
feholdexcept (&env);
w = TWO112[sx]+x;
t = w-TWO112[sx];
math_force_eval (t);
fesetenv (&env);
return t;
}

5
sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c
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@ -21,6 +21,7 @@
when it's coded in C. */
#include <math.h>
#include <math_private.h>
#include <fenv.h>
#include <math_ldbl_opt.h>
#include <float.h>
@ -53,6 +54,8 @@ __nearbyintl (long double x)
}
u.dd[0] = high;
u.dd[1] = 0.0;
math_force_eval (u.dd[0]);
math_force_eval (u.dd[1]);
fesetenv (&env);
}
else if (fabs (u.dd[1]) < TWO52 && u.dd[1] != 0.0)
@ -109,6 +112,8 @@ __nearbyintl (long double x)
}
u.dd[0] = high + low;
u.dd[1] = high - u.dd[0] + low;
math_force_eval (u.dd[0]);
math_force_eval (u.dd[1]);
fesetenv (&env);
}

2
sysdeps/ieee754/ldbl-96/s_nearbyintl.c
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@ -54,6 +54,7 @@ long double __nearbyintl(long double x)
feholdexcept (&env);
w = TWO63[sx]+x;
t = w-TWO63[sx];
math_force_eval (t);
fesetenv (&env);
GET_LDOUBLE_EXP(i0,t);
SET_LDOUBLE_EXP(t,(i0&0x7fff)|(sx<<15));
@ -80,6 +81,7 @@ long double __nearbyintl(long double x)
feholdexcept (&env);
w = TWO63[sx]+x;
t = w-TWO63[sx];
math_force_eval (t);
fesetenv (&env);
return t;
}