[lkml]   [2008]   [Oct]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] regression: vmalloc easily fail.
 > I'm guessing that the missing comment explains that this is
> intentional, to trap buffer overflows?

Actually, speaking of comments, it's interesting that
__get_vm_area_node() -- which is called from vmalloc() -- does:

* We always allocate a guard page.
size += PAGE_SIZE;

va = alloc_vmap_area(size, align, start, end, node, gfp_mask);

and alloc_vmap_area() adds another PAGE_SIZE, as the original email
pointed out:

while (addr + size >= first->va_start && addr + size <= vend) {
addr = ALIGN(first->va_end + PAGE_SIZE, align);

I wonder if the double padding is causing a problem when things get too

- R.

 \ /
  Last update: 2008-10-28 22:25    [W:0.088 / U:1.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site