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Re: Bug#754513: ITP: libressl -- SSL library, forked from OpenSSL

On Thu, 2014-07-17 at 13:11 +0000, Thorsten Glaser wrote:
> Ben Hutchings wrote:
> >Since Linux 2.6.29, you get 128 random bits at each execve(), which you
> >can access like this:
> getauxval() is only in (e)glibc, not in dietlibc or klibc, though.

True, and it was only added in glibc 2.16.  So here's a (probably)
portable implementation:

unsigned long my_getauxval(unsigned long type)
    extern char **environ;
    struct my_elf_auxv {
	unsigned long a_type;
	unsigned long a_val;
    } *auxp;
    char **envp;

    for (envp = environ; *envp; envp++)

    for (auxp = (struct my_elf_auxv *)envp; auxp->a_type; auxp++)
	if (auxp->a_type == type)
	    return auxp->a_val;
    return 0;

> Also, glibc already uses all 128 bits in some other place.

I already said that.


Ben Hutchings
Kids!  Bringing about Armageddon can be dangerous.  Do not attempt it in
your own home. - Terry Pratchett and Neil Gaiman, `Good Omens'

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