Subject: + mmap-arch_get_unmapped_area-use-proper-mmap-base-for-bottom-up-direction.patch added to -mm tree
To: heiko.carstens@xxxxxxxxxx,catalin.marinas@xxxxxxx,cmetcalf@xxxxxxxxxx,schwidefsky@xxxxxxxxxx,sinaelgl@xxxxxxxxx,walken@xxxxxxxxxx,will.deacon@xxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 10 Oct 2013 15:48:11 -0700
The patch titled
Subject: mmap: arch_get_unmapped_area(): use proper mmap base for bottom up direction
has been added to the -mm tree. Its filename is
mmap-arch_get_unmapped_area-use-proper-mmap-base-for-bottom-up-direction.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mmap-arch_get_unmapped_area-use-proper-mmap-base-for-bottom-up-direction.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mmap-arch_get_unmapped_area-use-proper-mmap-base-for-bottom-up-direction.patch
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From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Subject: mmap: arch_get_unmapped_area(): use proper mmap base for bottom up direction
This is more or less the generic variant of 41aacc1eea ("x86
get_unmapped_area: Access mmap_legacy_base through mm_struct member").
So effectively architectures which use an own arch_pick_mmap_layout()
implementation but call the generic arch_get_unmapped_area() now can also
randomize their mmap_base.
All architectures which have an own arch_pick_mmap_layout() and call the
generic arch_get_unmapped_area() (arm64, s390, tile) currently set
mmap_base to TASK_UNMAPPED_BASE. This is also true for the generic
arch_pick_mmap_layout() function. So this change is a no-op currently.
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Radu Caragea <sinaelgl@xxxxxxxxx>
Cc: Michel Lespinasse <walken@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/mmap.c~mmap-arch_get_unmapped_area-use-proper-mmap-base-for-bottom-up-direction mm/mmap.c
--- a/mm/mmap.c~mmap-arch_get_unmapped_area-use-proper-mmap-base-for-bottom-up-direction
+++ a/mm/mmap.c
@@ -1872,7 +1872,7 @@ arch_get_unmapped_area(struct file *filp
info.flags = 0;
info.length = len;
- info.low_limit = TASK_UNMAPPED_BASE;
+ info.low_limit = mm->mmap_base;
info.high_limit = TASK_SIZE;
info.align_mask = 0;
return vm_unmapped_area(&info);
_
Patches currently in -mm which might be from heiko.carstens@xxxxxxxxxx are
origin.patch
x86-add-missed-pgtable_pmd_page_ctor-dtor-calls-for-preallocated-pmds.patch
s390-handle-pgtable_page_ctor-fail.patch
mm-dynamically-allocate-page-ptl-if-it-cannot-be-embedded-to-struct-page.patch
mmap-arch_get_unmapped_area-use-proper-mmap-base-for-bottom-up-direction.patch
s390-mmap-randomize-mmap-base-for-bottom-up-direction.patch
linux-next.patch
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