Re: RFA: Allow .rdata to be writable on mips-wrs-vxworks

[Richard Sandiford <richard at codesourcery dot com>]

"Dave Korn" <dave.korn@artimi.com> writes:
> On 18 May 2007 10:07, Thiemo Seufer wrote:
>> Richard Sandiford wrote:
>>> Ping.
>> [snip]
>>>> ld/
>>>> 	* emulparams/elf32ebmipvxworks.sh (OTHER_READONLY_SECTIONS)
>>>> 	(OTHER_READWRITE_SECTIONS): Define.  Add .rdata sections.
>> 
>> Ok.
>> 
>> 
>> Thiemo
>
>
>   This might introduce significant security vulnerabilities in applications
> that keep e.g. vtbls or other function pointers in .rdata, mightn't it?

No, those vunerabilities are already there.  A writable .rdata input
section _already_ makes the output section writable; the patch simply
chooses the segment based on whether the output .rdata section is
already seen as writable.

Without the patch, a writable .rdata section goes in the text segment,
and makes the whole text segment writable.  The patch is a security
improvement in that respect.

Richard