CVS commit: src/sys

["Pierre Pronchery" <khorben%netbsd.org@localhost>]

Module Name:    src
Committed By:   khorben
Date:           Sun Mar 20 14:58:11 UTC 2016

Modified Files:
        src/sys/kern: kern_exec.c kern_pax.c
        src/sys/sys: pax.h

Log Message:
Let PaX ASLR know about the current emulation

This effectively fixes PaX ASLR with 32-bits emulation on 64-bits
platforms. Without this knowledge, the offset applied for 32-bits
programs was really meant for a 64-bits address space - thus
shifting the address up to 12 bits, with a success rate of about
1/4096. This offset is calculated once in the lifetime of the
process, which therefore behaved normally when able to start.

Fixes kern/50469, probably also kern/50986

Tested on NetBSD/amd64 (emul_netbsd32)


To generate a diff of this commit:
cvs rdiff -u -r1.423 -r1.424 src/sys/kern/kern_exec.c
cvs rdiff -u -r1.34 -r1.35 src/sys/kern/kern_pax.c
cvs rdiff -u -r1.17 -r1.18 src/sys/sys/pax.h

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