CVS commit: src/sys/kern

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Sat Aug 17 12:37:49 UTC 2019

Modified Files:
        src/sys/kern: subr_pool.c

Log Message:
Kernel Heap Hardening: use bitmaps on all off-page pools. This migrates 29
MI pools on amd64 from linked lists to bitmaps, which have higher security
properties.

Then, change the computation of the size of the PH pools: take into account
the bitmap area available by default in the ph_u2 union, and don't go with
&phpool[>0] if &phpool[0] already has enough space to embed a bitmap.

The pools that are migrated in this change all use bitmaps small enough to
fit in &phpool[0], therefore there is no increase in memory consumption.


To generate a diff of this commit:
cvs rdiff -u -r1.255 -r1.256 src/sys/kern/subr_pool.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.