Re: [PATCH] i386: instead of poisoning .init zone, change protection bits to force a fault

Benjamin LaHaise a écrit :

On Sun, Jan 29, 2006 at 09:04:44PM +0100, Eric Dumazet wrote:
Chasing some invalid accesses to .init zone, I found that free_init_pages()was properly freeing the pages but virtual was still usable.
This change will break the large table entries up, resulting in more TLBpressure and reducing performance, and so should only be activated as adebug option.


Hum... yet another CONFIG option ?

Could we 'just' move rodata (because of CONFIG_DEBUG_RODATA) and .init sectionin their own 2MB/4MB page, playing with vmlinux.lds.S ?

It would be possible to have a full hugepage readonly for rodata, and a fullNOPROT for .init ?


Eric
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References:
- [PATCH] i386: Add a temporary to make put_user more type safe.
  - From: [email protected] (Eric W. Biederman)
- Re: [PATCH] i386: Add a temporary to make put_user more type safe.
  - From: [email protected] (Eric W. Biederman)
- Re: [PATCH] i386: Add a temporary to make put_user more type safe.
  - From: Andrew Morton <[email protected]>
- Re: [PATCH] i386: Add a temporary to make put_user more type safe.
  - From: Andrew Morton <[email protected]>
- [PATCH] i386: instead of poisoning .init zone, change protection bits to force a fault
  - From: Eric Dumazet <[email protected]>
- Re: [PATCH] i386: instead of poisoning .init zone, change protection bits to force a fault
  - From: Benjamin LaHaise <[email protected]>

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