Fix nan functions handling of payload strings (bug 16961, bug 16962).
The nan, nanf and nanl functions handle payload strings by doing e.g.:
if (tagp[0] != '\0')
{
char buf[6 + strlen (tagp)];
sprintf (buf, "NAN(%s)", tagp);
return strtod (buf, NULL);
}
This is an unbounded stack allocation based on the length of the
argument. Furthermore, if the argument starts with an n-char-sequence
followed by ')', that n-char-sequence is wrongly treated as
significant for determining the payload of the resulting NaN, when ISO
C says the call should be equivalent to strtod ("NAN", NULL), without
being affected by that initial n-char-sequence. This patch fixes both
those problems by using the __strtod_nan etc. functions recently
factored out of strtod etc. for that purpose, with those functions
being exported from libc at version GLIBC_PRIVATE.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #16961]
[BZ #16962]
* math/s_nan.c (__nan): Use __strtod_nan instead of constructing a
string on the stack for strtod.
* math/s_nanf.c (__nanf): Use __strtof_nan instead of constructing
a string on the stack for strtof.
* math/s_nanl.c (__nanl): Use __strtold_nan instead of
constructing a string on the stack for strtold.
* stdlib/Versions (libc): Add __strtof_nan, __strtod_nan and
__strtold_nan to GLIBC_PRIVATE.
* math/test-nan-overflow.c: New file.
* math/test-nan-payload.c: Likewise.
* math/Makefile (tests): Add test-nan-overflow and
test-nan-payload.
2015-12-04 21:36:28 +01:00
|
|
|
/* Test nan functions payload handling (bug 16961).
|
2018-01-01 01:32:25 +01:00
|
|
|
Copyright (C) 2015-2018 Free Software Foundation, Inc.
|
Fix nan functions handling of payload strings (bug 16961, bug 16962).
The nan, nanf and nanl functions handle payload strings by doing e.g.:
if (tagp[0] != '\0')
{
char buf[6 + strlen (tagp)];
sprintf (buf, "NAN(%s)", tagp);
return strtod (buf, NULL);
}
This is an unbounded stack allocation based on the length of the
argument. Furthermore, if the argument starts with an n-char-sequence
followed by ')', that n-char-sequence is wrongly treated as
significant for determining the payload of the resulting NaN, when ISO
C says the call should be equivalent to strtod ("NAN", NULL), without
being affected by that initial n-char-sequence. This patch fixes both
those problems by using the __strtod_nan etc. functions recently
factored out of strtod etc. for that purpose, with those functions
being exported from libc at version GLIBC_PRIVATE.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #16961]
[BZ #16962]
* math/s_nan.c (__nan): Use __strtod_nan instead of constructing a
string on the stack for strtod.
* math/s_nanf.c (__nanf): Use __strtof_nan instead of constructing
a string on the stack for strtof.
* math/s_nanl.c (__nanl): Use __strtold_nan instead of
constructing a string on the stack for strtold.
* stdlib/Versions (libc): Add __strtof_nan, __strtod_nan and
__strtold_nan to GLIBC_PRIVATE.
* math/test-nan-overflow.c: New file.
* math/test-nan-payload.c: Likewise.
* math/Makefile (tests): Add test-nan-overflow and
test-nan-payload.
2015-12-04 21:36:28 +01:00
|
|
|
This file is part of the GNU C Library.
|
|
|
|
|
|
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
|
|
|
modify it under the terms of the GNU Lesser General Public
|
|
|
|
|
License as published by the Free Software Foundation; either
|
|
|
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
|
|
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
|
Lesser General Public License for more details.
|
|
|
|
|
|
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
|
|
|
License along with the GNU C Library; if not, see
|
|
|
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
|
|
|
|
#include <float.h>
|
|
|
|
|
#include <math.h>
|
|
|
|
|
#include <stdio.h>
|
|
|
|
|
#include <stdlib.h>
|
|
|
|
|
#include <string.h>
|
|
|
|
|
|
|
|
|
|
/* Avoid built-in functions. */
|
|
|
|
|
#define WRAP_NAN(FUNC, STR) \
|
|
|
|
|
({ const char *volatile wns = (STR); FUNC (wns); })
|
|
|
|
|
#define WRAP_STRTO(FUNC, STR) \
|
|
|
|
|
({ const char *volatile wss = (STR); FUNC (wss, NULL); })
|
|
|
|
|
|
|
|
|
|
#define CHECK_IS_NAN(TYPE, A) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
if (isnan (A)) \
|
|
|
|
|
puts ("PASS: " #TYPE " " #A); \
|
|
|
|
|
else \
|
|
|
|
|
{ \
|
|
|
|
|
puts ("FAIL: " #TYPE " " #A); \
|
|
|
|
|
result = 1; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
while (0)
|
|
|
|
|
|
|
|
|
|
#define CHECK_SAME_NAN(TYPE, A, B) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
if (memcmp (&(A), &(B), sizeof (A)) == 0) \
|
|
|
|
|
puts ("PASS: " #TYPE " " #A " = " #B); \
|
|
|
|
|
else \
|
|
|
|
|
{ \
|
|
|
|
|
puts ("FAIL: " #TYPE " " #A " = " #B); \
|
|
|
|
|
result = 1; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
while (0)
|
|
|
|
|
|
|
|
|
|
#define CHECK_DIFF_NAN(TYPE, A, B) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
if (memcmp (&(A), &(B), sizeof (A)) != 0) \
|
|
|
|
|
puts ("PASS: " #TYPE " " #A " != " #B); \
|
|
|
|
|
else \
|
|
|
|
|
{ \
|
|
|
|
|
puts ("FAIL: " #TYPE " " #A " != " #B); \
|
|
|
|
|
result = 1; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
while (0)
|
|
|
|
|
|
|
|
|
|
/* Cannot test payloads by memcmp for formats where NaNs have padding
|
|
|
|
|
bits. */
|
|
|
|
|
#define CAN_TEST_EQ(MANT_DIG) ((MANT_DIG) != 64 && (MANT_DIG) != 106)
|
|
|
|
|
|
|
|
|
|
#define RUN_TESTS(TYPE, SFUNC, FUNC, MANT_DIG) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
TYPE n123 = WRAP_NAN (FUNC, "123"); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, n123); \
|
|
|
|
|
TYPE s123 = WRAP_STRTO (SFUNC, "NAN(123)"); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, s123); \
|
|
|
|
|
TYPE n456 = WRAP_NAN (FUNC, "456"); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, n456); \
|
|
|
|
|
TYPE s456 = WRAP_STRTO (SFUNC, "NAN(456)"); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, s456); \
|
|
|
|
|
TYPE n123x = WRAP_NAN (FUNC, "123)"); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, n123x); \
|
|
|
|
|
TYPE nemp = WRAP_NAN (FUNC, ""); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, nemp); \
|
|
|
|
|
TYPE semp = WRAP_STRTO (SFUNC, "NAN()"); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, semp); \
|
|
|
|
|
TYPE sx = WRAP_STRTO (SFUNC, "NAN"); \
|
|
|
|
|
CHECK_IS_NAN (TYPE, sx); \
|
|
|
|
|
if (CAN_TEST_EQ (MANT_DIG)) \
|
|
|
|
|
CHECK_SAME_NAN (TYPE, n123, s123); \
|
|
|
|
|
if (CAN_TEST_EQ (MANT_DIG)) \
|
|
|
|
|
CHECK_SAME_NAN (TYPE, n456, s456); \
|
|
|
|
|
if (CAN_TEST_EQ (MANT_DIG)) \
|
|
|
|
|
CHECK_SAME_NAN (TYPE, nemp, semp); \
|
|
|
|
|
if (CAN_TEST_EQ (MANT_DIG)) \
|
|
|
|
|
CHECK_SAME_NAN (TYPE, n123x, sx); \
|
|
|
|
|
CHECK_DIFF_NAN (TYPE, n123, n456); \
|
|
|
|
|
CHECK_DIFF_NAN (TYPE, n123, nemp); \
|
|
|
|
|
CHECK_DIFF_NAN (TYPE, n123, n123x); \
|
|
|
|
|
CHECK_DIFF_NAN (TYPE, n456, nemp); \
|
|
|
|
|
CHECK_DIFF_NAN (TYPE, n456, n123x); \
|
|
|
|
|
} \
|
|
|
|
|
while (0)
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
do_test (void)
|
|
|
|
|
{
|
|
|
|
|
int result = 0;
|
|
|
|
|
RUN_TESTS (float, strtof, nanf, FLT_MANT_DIG);
|
|
|
|
|
RUN_TESTS (double, strtod, nan, DBL_MANT_DIG);
|
|
|
|
|
RUN_TESTS (long double, strtold, nanl, LDBL_MANT_DIG);
|
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#define TEST_FUNCTION do_test ()
|
|
|
|
|
#include "../test-skeleton.c"
|