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Re: [Qemu-devel] Re: [PATCH] Permit zero-sized qemu_malloc() & friends


From: malc
Subject: Re: [Qemu-devel] Re: [PATCH] Permit zero-sized qemu_malloc() & friends
Date: Sun, 6 Dec 2009 15:02:20 +0300 (MSK)

On Sun, 6 Dec 2009, Paolo Bonzini wrote:

> On 12/06/2009 11:22 AM, malc wrote:
> > Here, i believe, you are inventing artificial restrictions on how
> > malloc behaves, i don't see anything that prevents the implementor
> > from setting aside a range of addresses with 31st bit set as an
> > indicator of "zero" allocations, and then happily giving it to the
> > user of malloc and consumming it in free.
> 
> But it has to make it a valid address anyway.  If a zero-sized read treats it
> as invalid (SIGSEGV, EFAULT, whatever), malloc has failed to return a valid
> address and is not obeying its specification.

Once again - standard doesn't speak about "valid addresses".

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