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 TLB pressure and reducing performance, and so should only be activated as a debug option.

Hum... yet another CONFIG option ?

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

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

Eric
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• 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]>

• Prev by Date: Re: Does /sys/module/foo reflect external module name?
• Next by Date: Re: CD writing in future Linux try #2 [ was: Re: CD writing in future Linux (stirring up a hornets' nest) ]
• Previous by thread: Re: [PATCH] i386: instead of poisoning .init zone, change protection bits to force a fault
• Next by thread: [PATCH, V2] i386: instead of poisoning .init zone, change protection bits to force a fault
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]