On 25 April 2014 21:46, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > In message > <CAG5KPzw_cOfFLX_kn=5dwax+z+9vexuzo3q8yekdjg37tdq...@mail.gmail.com> > , Ben Laurie writes: >>On 25 April 2014 21:24, Ronald F. Guilmette <r...@tristatelogic.com> wrote: >>> Separately, a code example of the following general form was discussed: >>> >>> if (condition) variable = value1; >>> if (!condition) variable = value2; >>> use (variable); >>> > >>One better answer would be to have a way to annotate that after the >>two conditionals you assert that |variable| is initialised. Then a >>future, smarter static analyzer can attempt to prove you wrong. > > The way you do that *IS* to assert that the variable is indeed > set to something you can use.
That only works if there's at least one illegal value, though. And you know what it is :-) > If your "security" source code does not have at least 10% assert > lines, you're not really serious about security. People get really pissed off when I put asserts into OpenSSL. Perhaps they'll have a different opinion now. > And of course, if you compile the asserts out for "production" > you are downright moronic about security :-) > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ freebsd-security@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "freebsd-security-unsubscr...@freebsd.org"
