[Bug 1089722] Re: wcslen reads beyond the end of the buffer

[Andreas W Wylach]

I can confirm this bug. I already posted a question on stackoverflow a
few weeks ago (stackoverflow.com/questions/14474691/wifstream-with-
imbue-locale-produces-valgrind-errors) before I did deeper
investigation. In my current project I work with wstring/wchar_t and
also locale / imbue and valgrind reports errors as stated above.

Using Ubuntu 12.04 LTS

- libc6:
  Installed: 2.15-0ubuntu10.3
  Candidate: 2.15-0ubuntu10.3
  Version table:
 *** 2.15-0ubuntu10.3 0
        500 http://mo.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.15-0ubuntu10.2 0
        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
     2.15-0ubuntu10 0
        500 http://mo.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

$ /lib/x86_64-linux-gnu/libc.so.6
GNU C Library (Ubuntu EGLIBC 2.15-0ubuntu10.3) stable release version 2.15, by Roland McGrath et al.
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.6.3.
Compiled on a Linux 3.2.30 system on 2012-10-05.
Available extensions:
	crypt add-on version 2.1 by Michael Glad and others
	GNU Libidn by Simon Josefsson
	Native POSIX Threads Library by Ulrich Drepper et al
	BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<http://www.debian.org/Bugs/>.

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https://bugs.launchpad.net/bugs/1089722

Title:
  wcslen reads beyond the end of the buffer

Status in “valgrind” package in Ubuntu:
  Triaged

Bug description:
  valgrind reports many errors of wcslen reading beyond the end of the
  buffer.  It appears that sysdeps/x86_64/wcslen.S tries do do 64 bit
  reads which can result in reading beyond the end of the buffer if
  there are less than 64 bits left.

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