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[Gcl-devel] Re: Bug#487435: gcl sbrk patch

From: Camm Maguire
Subject: [Gcl-devel] Re: Bug#487435: gcl sbrk patch
Date: 31 Jul 2008 16:00:21 -0400
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Greetings, and thank you so much for this *very* helpful work!

I've modified very slightly in the newly uploaded -38 -- please let me
know if this works for you.

(Some machines pass the personality resetting step, but still fail to
pass this personality to the re-execed subprocess :-)) I block loops
with an environment variable.  Felt a little nervous about the
portability of readlink. 

Would love to autogenerate configure -- not yet.

Take care,

Peter De Wachter <address@hidden> writes:

> Package: gcl
> Version: 2.6.7-36.1
> Followup-For: Bug #487435
> The attached patch fixes gcl's personality(ADDR_NO_RANDOMIZE)
> code. (BTW, this randomization seems to have become enabled by default
> Debian's 2.6.25 amd64 kernels).
> - gcl tries to figure out at build time whether the randomized sbrk
>   work-around is needed. But such things should be either checked at
>   run-time or applied unconditionally. (The buildd could still be
>   running an old kernel, or the user might have a paranoid setup, etc.)
>   So I patched the configure.in script. The new logic is:
>    - check if ADDR_NO_RANDOMIZE is defined in the system headers. If
>      not, define it ourselves. [This was the cause of this FTBS, gcl
>      #defined it unconditionally, while glibc now has it as an enum
>      value.]
>    - check if personality(ADDR_NO_RANDOMIZE) compiles and is accepted
>      by the kernel.
>    - if it works, use it unconditionally.
>    - if it does not work, check if address randomization is in
>      effect. Refuse to build if it is.
>   Currently, debian/rules does not try to regenerate configure,
>   referering the some bug with autoconf and emacsen-common. I'll leave
>   that part to you :)
> - I replaced the code in o/main.c with the equivalent code from sbcl,
>   which seems more robust (it protects against an infinite loop on
>   broken kernels, and doesn't rely on the value of argv[0]).
>   (Also, both the configure script and main.c tried to use
>   personality(-1) to get the current personality. This fails on 64-bit
>   systems, the correct call is personality(0xffffffffUL)).
> - When compiling with profiling, I added a call to gprof_cleanup()
>   before exec'ing, otherwise the build would fail with SIGPROF.
> All programs requiring gcl should probably be rebuild when this is
> fixed.
> -- System Information:
> Debian Release: lenny/sid
>   APT prefers unstable
>   APT policy: (500, 'unstable'), (1, 'experimental')
> Architecture: amd64 (x86_64)
> Kernel: Linux 2.6.25-2-amd64 (SMP w/1 CPU core)
> Locale: LANG=nl_BE.UTF-8, LC_CTYPE=nl_BE.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Versions of packages gcl depends on:
> ii  debconf                   1.5.22         Debian configuration management 
> sy
> ii  emacs [emacsen]           22.2+2-2       The GNU Emacs editor 
> (metapackage)
> ii  emacs22-gtk [emacsen]     22.2+2-2       The GNU Emacs editor (with GTK 
> use
> ii  gcc                       4:4.3.1-2      The GNU C compiler
> ii  libc6                     2.7-12         GNU C Library: Shared libraries
> ii  libgmp3c2                 2:4.2.2+dfsg-3 Multiprecision arithmetic library
> ii  libice6                   2:1.0.4-1      X11 Inter-Client Exchange library
> ii  libncurses5               5.6+20080713-1 shared libraries for terminal 
> hand
> ii  libreadline5              5.2-3          GNU readline and history 
> libraries
> ii  libsm6                    2:1.0.3-2      X11 Session Management library
> ii  libx11-6                  2:1.1.4-2      X11 client-side library
> ii  libxaw7                   2:1.0.4-2      X11 Athena Widget library
> ii  libxext6                  2:1.0.4-1      X11 miscellaneous extension 
> librar
> ii  libxmu6                   2:1.0.4-1      X11 miscellaneous utility library
> ii  libxt6                    1:1.0.5-3      X11 toolkit intrinsics library
> ii  tcl8.4                    8.4.19-2       Tcl (the Tool Command Language) 
> v8
> ii  tk8.4                     8.4.19-2       Tk toolkit for Tcl and X11, v8.4 
> -
> gcl recommends no packages.
> Versions of packages gcl suggests:
> pn  gcl-doc                       <none>     (no description available)
> -- debconf information:
>   gcl/default_gcl_ansi:
>   gcl/default_gcl_prof:

Camm Maguire                                            address@hidden
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah

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