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 20:36:28 +00:00
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/* Test nan functions payload handling (bug 16961).
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2017-01-01 00:14:16 +00:00
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Copyright (C) 2015-2017 Free Software Foundation, Inc.
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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 20:36:28 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <float.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Avoid built-in functions. */
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#define WRAP_NAN(FUNC, STR) \
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({ const char *volatile wns = (STR); FUNC (wns); })
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#define WRAP_STRTO(FUNC, STR) \
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({ const char *volatile wss = (STR); FUNC (wss, NULL); })
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#define CHECK_IS_NAN(TYPE, A) \
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do \
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{ \
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if (isnan (A)) \
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puts ("PASS: " #TYPE " " #A); \
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else \
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{ \
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puts ("FAIL: " #TYPE " " #A); \
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result = 1; \
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} \
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} \
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while (0)
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#define CHECK_SAME_NAN(TYPE, A, B) \
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do \
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{ \
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if (memcmp (&(A), &(B), sizeof (A)) == 0) \
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puts ("PASS: " #TYPE " " #A " = " #B); \
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else \
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{ \
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puts ("FAIL: " #TYPE " " #A " = " #B); \
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result = 1; \
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} \
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} \
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while (0)
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#define CHECK_DIFF_NAN(TYPE, A, B) \
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do \
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{ \
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if (memcmp (&(A), &(B), sizeof (A)) != 0) \
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puts ("PASS: " #TYPE " " #A " != " #B); \
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else \
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{ \
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puts ("FAIL: " #TYPE " " #A " != " #B); \
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result = 1; \
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} \
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} \
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while (0)
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/* Cannot test payloads by memcmp for formats where NaNs have padding
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bits. */
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#define CAN_TEST_EQ(MANT_DIG) ((MANT_DIG) != 64 && (MANT_DIG) != 106)
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#define RUN_TESTS(TYPE, SFUNC, FUNC, MANT_DIG) \
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do \
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{ \
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TYPE n123 = WRAP_NAN (FUNC, "123"); \
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CHECK_IS_NAN (TYPE, n123); \
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TYPE s123 = WRAP_STRTO (SFUNC, "NAN(123)"); \
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CHECK_IS_NAN (TYPE, s123); \
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TYPE n456 = WRAP_NAN (FUNC, "456"); \
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CHECK_IS_NAN (TYPE, n456); \
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TYPE s456 = WRAP_STRTO (SFUNC, "NAN(456)"); \
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CHECK_IS_NAN (TYPE, s456); \
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TYPE n123x = WRAP_NAN (FUNC, "123)"); \
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CHECK_IS_NAN (TYPE, n123x); \
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TYPE nemp = WRAP_NAN (FUNC, ""); \
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CHECK_IS_NAN (TYPE, nemp); \
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TYPE semp = WRAP_STRTO (SFUNC, "NAN()"); \
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CHECK_IS_NAN (TYPE, semp); \
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TYPE sx = WRAP_STRTO (SFUNC, "NAN"); \
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CHECK_IS_NAN (TYPE, sx); \
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if (CAN_TEST_EQ (MANT_DIG)) \
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CHECK_SAME_NAN (TYPE, n123, s123); \
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if (CAN_TEST_EQ (MANT_DIG)) \
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CHECK_SAME_NAN (TYPE, n456, s456); \
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if (CAN_TEST_EQ (MANT_DIG)) \
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CHECK_SAME_NAN (TYPE, nemp, semp); \
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if (CAN_TEST_EQ (MANT_DIG)) \
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CHECK_SAME_NAN (TYPE, n123x, sx); \
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CHECK_DIFF_NAN (TYPE, n123, n456); \
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CHECK_DIFF_NAN (TYPE, n123, nemp); \
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CHECK_DIFF_NAN (TYPE, n123, n123x); \
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CHECK_DIFF_NAN (TYPE, n456, nemp); \
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CHECK_DIFF_NAN (TYPE, n456, n123x); \
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} \
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while (0)
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static int
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do_test (void)
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{
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int result = 0;
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RUN_TESTS (float, strtof, nanf, FLT_MANT_DIG);
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RUN_TESTS (double, strtod, nan, DBL_MANT_DIG);
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RUN_TESTS (long double, strtold, nanl, LDBL_MANT_DIG);
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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