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Fill the .text padding with 0xcc (int3), in such a way that any jump into 

this area will automatically fault. The alignment within the section is
necessary, in order to fill strictly all of the padding (took me a while
to figure this out); but it does not change the kernel size.

Greatly inspired from FreeBSD, but for some reason they decided not to
apply the alignment.
This commit is contained in:
maxv 2017-08-18 10:28:53 +00:00
parent 9f398f9327
commit 295e874f10
3 changed files with 12 additions and 33 deletions
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15
sys/arch/amd64/conf/kern.ldscript
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern.ldscript,v 1.23 2017/06/14 07:45:45 maxv Exp $ */
/* $NetBSD: kern.ldscript,v 1.24 2017/08/18 10:28:53 maxv Exp $ */
#include "assym.h"
@ -13,12 +13,13 @@ __LARGE_PAGE_SIZE = 0x200000 ;
ENTRY(_start)
SECTIONS
{
.text :
.text : AT (ADDR(.text) & 0x0fffffff)
{
*(.text)
*(.text.*)
*(.stub)
}
. = ALIGN(__LARGE_PAGE_SIZE);
} =0xCC
_etext = . ;
PROVIDE (etext = .) ;
@ -79,11 +80,3 @@ SECTIONS
}
}
SECTIONS
{
.text :
AT (ADDR(.text) & 0x0fffffff)
{
*(.text)
} = 0
}

15
sys/arch/i386/conf/kern.ldscript
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern.ldscript,v 1.19 2016/05/14 08:19:42 maxv Exp $ */
/* $NetBSD: kern.ldscript,v 1.20 2017/08/18 10:28:53 maxv Exp $ */
#include "assym.h"
@ -7,12 +7,13 @@ __PAGE_SIZE = 0x1000 ;
ENTRY(_start)
SECTIONS
{
.text :
.text : AT (ADDR(.text) & 0x0fffffff)
{
*(.text)
*(.text.*)
*(.stub)
}
. = ALIGN(__PAGE_SIZE);
} =0xCC
_etext = . ;
PROVIDE (etext = .) ;
@ -69,11 +70,3 @@ SECTIONS
}
}
SECTIONS
{
.text :
AT (ADDR(.text) & 0x0fffffff)
{
*(.text)
} = 0
}

15
sys/arch/i386/conf/kern.ldscript.4MB
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern.ldscript.4MB,v 1.17 2016/05/16 07:52:31 maxv Exp $ */
/* $NetBSD: kern.ldscript.4MB,v 1.18 2017/08/18 10:28:53 maxv Exp $ */
#include "assym.h"
@ -12,12 +12,13 @@ __LARGE_PAGE_SIZE = 0x400000 ;
ENTRY(_start)
SECTIONS
{
.text :
.text : AT (ADDR(.text) & 0x0fffffff)
{
*(.text)
*(.text.*)
*(.stub)
}
. = ALIGN(__LARGE_PAGE_SIZE);
} =0xCC
_etext = . ;
PROVIDE (etext = .) ;
@ -78,11 +79,3 @@ SECTIONS
}
}
SECTIONS
{
.text :
AT (ADDR(.text) & 0x0fffffff)
{
*(.text)
} = 0
}