Messages in this thread Patch in this message | | | From | Heiko Carstens <> | Subject | [PATCH 1/2] mmap: arch_get_unmapped_area(): use proper mmap base for bottom up direction | Date | Wed, 9 Oct 2013 11:06:42 +0200 |
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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@de.ibm.com> --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c index 9d54851..fa206ab 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1872,7 +1872,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, 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); -- 1.8.3.4
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