[PATCH] Allow exec on 32-bit from readable, non-exec pages, with a warning.

[Segher Boessenkool]

> In older versions of glibc (through 2.3), the dynamic linker  
> executes a
> small amount of code from the data segment, which is not marked as
> executable.  A recent change (commit  
> 9ba4ace39fdfe22268daca9f28c5df384ae462cf)
> stops this from working; there should be a deprecation period before
> older glibc versions stop working.
>
> The problem has been observed on glibc 2.2.  While glibc 2.3 has  
> the same
> code, I did not see the problem; it may be that it accesses the  
> page in
> question as data before executing from it, and thus it is already  
> mapped.
>
> Signed-off-by: Scott Wood <scottwood at freescale.com>

Acked-by: Segher Boessenkool <segher at kernel.crashing.org>

> Unfortunately, this didn't make it into 2.6.22, but it should  
> probably go
> into the stable branch...

Both .21.x and .22.x I suppose; if we care about glibc 2.2.x
at all still, that is.

So to make double sure, this doesn't warn on glibc 2.3.x?


Segher