Quoting Stéphane Graber (stgra...@ubuntu.com):
> On Fri, Aug 16, 2013 at 10:36:58AM -0500, Serge Hallyn wrote:
> > Quoting Stéphane Graber (stgra...@ubuntu.com):
> > > initstate/random doesn't work on bionic, srand/rand works on everything,
> > > so let's use that.
> >
> > Is rand_r available on bionic?
> >
> > rand() isn't thread-safe.
>
> Unfortunately no, I actually don't think Bionic has any of the _r
> functions.
>
> Is it actually a problem in this case? It looks like the worst that
> could happen is that the random number generator gets re-seeded from
> urandom between two calls, which would just make it even more random,
> no?
That was my guess based on the manpage, but I didn't look at the
source. Sounds compelling,
Acked-by: Serge E. Hallyn <serge.hal...@ubuntu.com>
> > > Signed-off-by: Stéphane Graber <stgra...@ubuntu.com>
> > > ---
> > > src/lxc/conf.c | 5 ++---
> > > 1 file changed, 2 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/src/lxc/conf.c b/src/lxc/conf.c
> > > index 867a150..3d99469 100644
> > > --- a/src/lxc/conf.c
> > > +++ b/src/lxc/conf.c
> > > @@ -288,7 +288,6 @@ static char *mkifname(char *template)
> > > int i = 0;
> > > FILE *urandom;
> > > unsigned int seed;
> > > - char randstate[2048];
> > > struct ifaddrs *ifaddr, *ifa;
> > > int ifexists = 0;
> > >
> > > @@ -304,7 +303,7 @@ static char *mkifname(char *template)
> > > }
> > > else
> > > seed = time(0);
> > > - initstate(seed, randstate, 256);
> > > + srand(seed);
> > >
> > > /* Generate random names until we find one that doesn't exist */
> > > while(1) {
> > > @@ -316,7 +315,7 @@ static char *mkifname(char *template)
> > >
> > > for (i = 0; i < strlen(name); i++) {
> > > if (name[i] == 'X') {
> > > - name[i] = padchar[random() % (strlen(padchar) -
> > > 1)];
> > > + name[i] = padchar[rand() % (strlen(padchar) -
> > > 1)];
> > > }
> > > }
> > >
> > > --
> > > 1.8.3.2
> > >
> > >
> > > ------------------------------------------------------------------------------
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>
> --
> Stéphane Graber
> Ubuntu developer
> http://www.ubuntu.com
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