[Bug libc/17879] New: Library is missing memset_s

[noloader at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17879

            Bug ID: 17879
           Summary: Library is missing memset_s
           Product: glibc
           Version: 2.20
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: noloader at gmail dot com
                CC: drepper.fsp at gmail dot com

memset_s is missing from the library.

I'm attempting to use memset_s to zero some memory. memset_s is guaranteed not
to be optimized away, so its appealing to use it rather than the alternatives. 
Zeroization is a process requirement, and I can't discard it.

bzero cannot be used because (1) its non-portable, and (2) its deprecated.

The volatile qualifier cannot be used because GCC interprets it to mean only
memory that can be changed by hardware (a more lenient interpretation by the
GCC folks would be very helpful. But it is what it is).

memset_s not available in 2.19:

  $ nm -D /lib/x86_64-linux-gnu/libc.so.6 | grep memset_s
  $
  $ ls -l /lib/x86_64-linux-gnu/libc.so.6 lrwxrwxrwx 1 root root 12 Dec  4
14:31 /lib/x86_64-linux-gnu/libc.so.6 -> libc-2.19.so

And checking out the latest, memset_s is not available in 2.20 (or is it
2.21?):

  $ git clone git://sourceware.org/git/glibc.git
  $ cd glibc
  $ grep -R -w memset_s *
  $

I understand the safer functions from TR 24731-1 are not popular, but there
should be no objections for a memset function that is not optimized away
(correct me here, please).

Please provide the memset_s for safety and portability.

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