From: Ulrich Drepper <drepper@redhat.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Blaisorblade <blaisorblade@yahoo.it>,
Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org,
Linux Memory Management <linux-mm@kvack.org>,
Val Henson <val.henson@intel.com>
Subject: Re: [patch 00/14] remap_file_pages protection support
Date: Sat, 06 May 2006 08:26:37 -0700 [thread overview]
Message-ID: <445CC02D.8000600@redhat.com> (raw)
In-Reply-To: <445C6717.1000402@yahoo.com.au>
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Nick Piggin wrote:
> I see no reason why they couldn't both go in. In fact, having an mmap
> flag for
> adding guard regions around vmas (and perhaps eg. a system-wide /
> per-process
> option for stack) could almost go in tomorrow.
This would have to be flexible, though. For thread stacks, at least,
the programmer is able to specify the size of the guard area. It can be
arbitrarily large.
Also, consider IA-64. Here we have two stacks. We allocate them with
one mmap call and put the guard somewhere in the middle (the optimal
ratio of CPU and register stack size is yet to be determined) and have
the stack grow toward each other. This results into three VMAs in the
moment. Anything which results on more VMAs obviously isn't good.
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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next prev parent reply other threads:[~2006-05-06 15:26 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-30 17:29 [patch 00/14] remap_file_pages protection support blaisorblade
2006-04-30 17:29 ` [patch 01/14] Fix comment about remap_file_pages blaisorblade
2006-04-30 17:29 ` [patch 02/14] remap_file_pages protection support: add needed macros blaisorblade
2006-04-30 17:29 ` [patch 03/14] remap_file_pages protection support: handle MANYPROTS VMAs blaisorblade
2006-04-30 17:29 ` [patch 04/14] remap_file_pages protection support: disallow mprotect() on manyprots mappings blaisorblade
2006-04-30 17:29 ` [patch 05/14] remap_file_pages protection support: cleanup syscall checks blaisorblade
2006-04-30 17:29 ` [patch 06/14] remap_file_pages protection support: enhance syscall interface blaisorblade
2006-04-30 17:30 ` [patch 07/14] remap_file_pages protection support: support private vma for MAP_POPULATE blaisorblade
2006-04-30 17:30 ` [patch 08/14] remap_file_pages protection support: use FAULT_SIGSEGV for protection checking blaisorblade
2006-04-30 17:30 ` [patch 09/14] remap_file_pages protection support: fix race condition with concurrent faults on same address space blaisorblade
2006-04-30 17:30 ` [patch 10/14] remap_file_pages protection support: fix get_user_pages() on VM_MANYPROTS vmas blaisorblade
2006-04-30 17:30 ` [patch 11/14] remap_file_pages protection support: pte_present should not trigger on PTE_FILE PROTNONE ptes blaisorblade
2006-05-02 3:53 ` Nick Piggin
2006-05-03 1:29 ` Blaisorblade
2006-05-06 10:03 ` Nick Piggin
2006-05-07 17:50 ` Blaisorblade
2006-04-30 17:30 ` [patch 12/14] remap_file_pages protection support: also set VM_NONLINEAR on nonuniform VMAs blaisorblade
2006-04-30 17:30 ` [patch 13/14] remap_file_pages protection support: uml, i386, x64 bits blaisorblade
2006-04-30 17:30 ` [patch 14/14] remap_file_pages protection support: adapt to uml peculiarities blaisorblade
2006-05-02 3:45 ` [patch 00/14] remap_file_pages protection support Nick Piggin
2006-05-02 3:56 ` Nick Piggin
2006-05-02 11:24 ` Ingo Molnar
2006-05-02 12:19 ` Nick Piggin
2006-05-02 17:16 ` Lee Schermerhorn
2006-05-03 1:20 ` Blaisorblade
2006-05-03 14:35 ` Lee Schermerhorn
2006-05-03 0:25 ` Blaisorblade
2006-05-06 16:05 ` Ulrich Drepper
2006-05-07 4:22 ` Nick Piggin
2006-05-13 14:13 ` Nick Piggin
2006-05-13 18:19 ` Valerie Henson
2006-05-13 22:54 ` Valerie Henson
2006-05-16 13:30 ` Nick Piggin
2006-05-16 13:51 ` Andreas Mohr
2006-05-16 16:31 ` Valerie Henson
2006-05-16 16:47 ` Andreas Mohr
2006-05-17 3:25 ` Nick Piggin
2006-05-17 6:10 ` Blaisorblade
2006-05-16 16:33 ` Valerie Henson
2006-05-03 0:44 ` Blaisorblade
2006-05-06 9:06 ` Nick Piggin
2006-05-06 15:26 ` Ulrich Drepper [this message]
2006-05-02 10:21 ` Arjan van de Ven
2006-05-02 23:46 ` Valerie Henson
2006-05-03 0:26 ` Blaisorblade
2006-05-03 1:44 ` Ulrich Drepper
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