On Wed, 5 Jan 2000, Brian Gerst wrote:
> "Richard B. Johnson" wrote:
> > > > Many programs have counted on being able to overwrite command-line
> > > > arguments so that other information shows in `ps`. Linux Version 2.3.35
> > > > now prevents that from working. Is this a new <security feature> or
> > > > is it related to the kernel command-line bug already reported?
> > >
> > > Looks like a race condition to me... the child could be scheduled before
> > > the parent and run before argv[0] is changed. Move the strcpy to before
> > > the fork and that should fix it.
> >
> > Well even if it fixed it, it could not work in most applications.
> > Here is a typical application (like inetd).
>
> My bad, I didn't investigate it very far before I responded. It seems
> that in proc_pid_cmdline(), it only returns the number of characters
> that were in the _original_ command line (including nulls between
> args). Also keep in mind that the shell eats unquoted spaces. This may
> have been a result of when /proc was revamped a while back.
>
> --
Well it seems that I guess there will have to be dummy command-lines
for all tasks that create children (er, maybe even init) to get the
previous behavior. Not impossible, but not_good(tm).
Cheers,
Dick Johnson
Penguin : Linux version 2.3.35 on an i686 machine (400.59 BogoMips).
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