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SubjectRe: [PATCH] stronger ELF sanity checks v2
Date
On Friday 16 January 2004 10:08, Pavel Machek wrote:
> Hi!
>
> > On Tue, Jan 13, 2004 at 02:55:07AM +0100, Jesper Juhl wrote:
> > > Here's the second version of my patch to add better sanity checks for
> > > binfmt_elf
> >
> > I assume this breaks Brian Raiter's tiny ELF executables[1]. Even
> > though these binaries are evil hacks that don't comply to standards
> > and serve no serious purpose, I'm not sure what the purpose of the
> > sanity checks is. Are there any risks associated with running
> > non-compliant ELF executables? (Now that I mention it, the
>
> You get vy ugly behaviour. If you compile executable with huge static
> data, it will compile okay, link okay, *launch okay* and die on
> segfault. That's wrong, it should have died on -ENOMEM during exec.
> Pave

Wouldn't that depend on the overcommit options?

With permitted overcommit -
compile/link ok
launch - segfault/-ENOMEM if heap/stack + static data UPDATES exceed
system capacity
Without overcommit:
-ENOMEM if the heap/stack can't be initialized; as in even the
first page of the heap/stack fails - and before actual
launch completes, as the situation you describe.

If static data is just referenced, it should page in, and get dropped.
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