Adhemerval Zanella b65b205fbc libio: Fix fmemopen append mode failure (BZ# 20012) ...

The fmemopen implementation does not account the file position correctly in
append mode. The following example shows the failure:

===
int main ()
{
  char buf[10] = "test";
  FILE *fp = fmemopen (buf, 10, "a+");
  fseek (fp, 0, SEEK_SET);

  int gr;
  if ((gr = getc (fp)) != 't' ||
      (gr = getc (fp)) != 'e' ||
      (gr = getc (fp)) != 's' ||
      (gr = getc (fp)) != 't' ||
      (gr = getc (fp)) != EOF)
    {
      printf ("%s: getc failed returned %i\n", __FUNCTION__, gr);
      return 1;
    }

  return 0;
}
===

This is due both how read and write operation update the buffer position,
taking in consideration buffer lenght instead of maximum position defined
by the open mode.  This patch fixes it and also fixes fseek not returning
EINVAL for invalid whence modes.

Tested on x86_64 and i686.

	[BZ #20012]
	* libio/fmemopen.c (fmemopen_read): Use buffer maximum position, not
	length to calculate the buffer to read.
	(fmemopen_write): Set the buffer position based on bytes written.
	(fmemopen_seek): Return EINVAL for invalid whence modes.

2016-04-29 19:25:17 -03:00

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bits

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asprintf.c

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bug23-2.c

CVE-2012-3406: Stack overflow in vfprintf [BZ #16617]

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CVE-2012-3406: Stack overflow in vfprintf [BZ #16617]

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bug25.c

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Depend

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Makefile

libio: Update internal fmemopen position after write (BZ #20005)

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perror.c

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printf_fp.c

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scanf15.c

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test-fseek.c

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test-fwrite.c

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tst-fmemopen2.c

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tst-fmemopen3.c

libio: Fix fmemopen append mode failure (BZ# 20012)

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tst-fmemopen4.c

libio: Update internal fmemopen position after write (BZ #20005)

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tst-fmemopen.c

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vfprintf.c

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vfscanf.c

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