[Bug libc/12874] New: Wrong assumption in sysdeps/wordsize-64/tst-writev.c

[Bug libc/12874] New: Wrong assumption in sysdeps/wordsize-64/tst-writev.c

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12874

           Summary: Wrong assumption in sysdeps/wordsize-64/tst-writev.c
           Product: glibc
           Version: 2.14
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: hjl.tools@gmail.com


sysdeps/wordsize-64/tst-writev.c has

/* writev() should report that it has written EXPECTED number of bytes.  */
#define EXPECTED ((size_t) INT32_MAX + 1)
...
 /* Write junk to /dev/null with the writev syscall in order to get a return
     of INT32_MAX+1 bytes to verify that the INTERNAL_SYSCALL wrappers aren't
     mangling the result if the signbit of a 32-bit number is set.  */
  ssize_t ret = writev (fd, iv, IOV_MAX);

  free (iv[0].iov_base);
  close (fd);

  if (ret != (ssize_t) EXPECTED)
    {
      printf ("writev() return value: %zd != EXPECTED: %zd\n", ret, EXPECTED);
      return 1;
    }

But kernel 2.6.38 has imposed a limit of (currently) 2 GiB-one page
for an individual I/O in order to avoid certain classes of security
problems.

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[Bug libc/12874] Wrong assumption in sysdeps/wordsize-64/tst-writev.c

[drepper.fsp at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12874

Ulrich Drepper <drepper.fsp at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #1 from Ulrich Drepper <drepper.fsp at gmail dot com> 2011-06-24 19:00:03 UTC ---
I added a work-around.

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[Bug libc/12874] Wrong assumption in sysdeps/wordsize-64/tst-writev.c

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=12874

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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