CVS commit: src/sys/arch/x86/x86

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

Module Name:    src
Committed By:   maxv
Date:           Fri Jul  3 16:17:25 UTC 2020

Modified Files:
        src/sys/arch/x86/x86: vm_machdep.c

Log Message:
In cpu_uarea_{alloc,free}:

 - My previous change in this file was not correct, kremove does not free
   the underlying PA, which caused a very slow leak under memory pressure.
   Rework to correctly free the PA.
 - Add a second redzone, this time after the stack, to catch several stack
   overflows. The main concern is read overflows which leak the heap that
   follows the stack.
 - UVM_KMF_WAITVA doesn't fail, so remove error check.
 - Add KASSERTs.


To generate a diff of this commit:
cvs rdiff -u -r1.42 -r1.43 src/sys/arch/x86/x86/vm_machdep.c

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