Joseph Myers 8f5e8b01a1 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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a64l.c

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abort.c

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div.c

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divmod_1.c

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divrem.c

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drand48_r.c

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jrand48_r.c

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jrand48.c

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makecontext.c

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Makefile

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monetary.h

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mul_n.c

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mul.c

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secure-getenv.c

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seed48_r.c

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seed48.c

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setcontext.c

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setenv.c

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srand48_r.c

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srand48.c

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stdlib.h

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strfmon_l.c

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strtod_l.c

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strtod_nan_double.h

Refactor strtod parsing of NaN payloads.

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strtod_nan_float.h

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strtod_nan_main.c

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strtod_nan_narrow.h

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strtod_nan_wide.h

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strtod_nan.c

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strtod.c

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strtof_l.c

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strtof_nan.c

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strtof.c

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strtoimax.c

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strtol_l.c

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strtol.c

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strtold_l.c

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strtold_nan.c

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strtold.c

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sub_n.c

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submul_1.c

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swapcontext.c

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system.c

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tst-makecontext.c

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tst-setcontext2.c

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tst-setcontext3.c

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tst-setcontext3.sh

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tst-strtod-nan-locale-main.c

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tst-strtod-nan-locale.c

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tst-strtod-overflow.c

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tst-strtod-round-data

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tst-strtod-round.c

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tst-strtod.c

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tst-strtol-locale-main.c

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tst-strtol-locale.c

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tst-strtol.c

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tst-tls-atexit-lib.c

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tst-tls-atexit-nodelete.c

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tst-tls-atexit.c

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Versions

Fix nan functions handling of payload strings (bug 16961, bug 16962).

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wcstoimax.c

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wcstombs.c

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