Sujet : Re: Capabilities, Anybody?
De : mitchalsup (at) *nospam* aol.com (MitchAlsup1)
Groupes : comp.archDate : 14. Mar 2024, 17:45:57
Autres entêtes
Organisation : Rocksolid Light
Message-ID : <d408890f4a40fe2ada63a06159b15222@www.novabbs.org>
References : 1 2 3 4 5 6 7
User-Agent : Rocksolid Light
Theo Markettos wrote:
BGB <cr88192@gmail.com> wrote:
Presumably, in addition to the code, one needs some way for the code to be able to access its own ".data" and ".bss" sections when called.
AIUI you derive a capability from PCC (the PC capability) that gives you
access to your local 'captable', which then holds pointers to your other
objects. The captable can be read-only but the capabilities inside it can
be writable (ie pointers allow you to write to your globals etc).
Some options:
PC-relative:
Unclear if valid in this case.
GOT:
Table of pointers to things, loaded somehow.
One example here being the ELF FDPIC ABI.
Reloading a Global Pointer via a lookup table accessed via itself.
This is what my ABI uses...
I couldn't seem to find any technical descriptions of the CHERI/Morello ABI. I had made a guess that it might work similar to FDPIC, as this could be implemented without needing to use raw addresses (and seemed like a "best fit").
This is a description of the linkage model for CHERI MIPS; I'm not aware of
anything having changed significantly for RISC-V or Morello, although exact
usage of registers etc will be different.
https://www.cl.cam.ac.uk/research/security/ctsrd/pdfs/20190113-cheri-linkage.pdf
This also describes the OS-facing ABI on CheriBSD:
https://www.cl.cam.ac.uk/research/security/ctsrd/pdfs/201904-asplos-cheriabi.pdf
So, how does a Cheri machine do::
void foo( int * i )
{
static int j;
int *k = &j;
bar( k, i );
}
And how does a Cheri machine implement fprintf( file *f, ... ) from
void printf( ... )
{
fprintf( stdout, ... );
}
Theo
Date | Sujet | # | | Auteur |
9 Mar 24 | Capabilities, Anybody? | 78 | | Lawrence D'Oliveiro |
9 Mar 24 | Re: Capabilities, Anybody? | 74 | | mitchalsup@aol.com (MitchAlsup1) |
9 Mar 24 | Re: Capabilities, Anybody? | 1 | | BGB |
9 Mar 24 | Re: Capabilities, Anybody? | 71 | | BGB |
9 Mar 24 | Re: Capabilities, Anybody? | 61 | | Robert Finch |
9 Mar 24 | Re: Capabilities, Anybody? | 1 | | Lawrence D'Oliveiro |
10 Mar 24 | Re: Capabilities, Anybody? | 59 | | BGB |
10 Mar 24 | Re: Capabilities, Anybody? | 1 | | Chris M. Thomasson |
10 Mar 24 | Re: Capabilities, Anybody? | 57 | | Theo Markettos |
10 Mar 24 | Re: Capabilities, Anybody? | 4 | | John Dallman |
11 Mar 24 | Re: Capabilities, Anybody? | 3 | | Theo |
17 Mar 24 | Re: Capabilities, Anybody? | 2 | | John Dallman |
18 Mar 24 | Re: Capabilities, Anybody? | 1 | | Robert Finch |
10 Mar 24 | Re: Capabilities, Anybody? | 19 | | MitchAlsup1 |
11 Mar 24 | Re: Capabilities, Anybody? | 18 | | Theo Markettos |
11 Mar 24 | Re: Capabilities, Anybody? | 10 | | MitchAlsup1 |
11 Mar 24 | Re: Capabilities, Anybody? | 9 | | Theo Markettos |
11 Mar 24 | Re: Capabilities, Anybody? | 1 | | George Neuner |
11 Mar 24 | Re: Capabilities, Anybody? | 7 | | Michael S |
11 Mar 24 | Re: Capabilities, Anybody? | 1 | | Michael S |
11 Mar 24 | Re: Capabilities, Anybody? | 5 | | Michael S |
11 Mar 24 | Broken Date formats | 4 | | Michael S |
11 Mar 24 | Re: Broken Date formats | 3 | | Michael S |
11 Mar 24 | Re: Broken Date formats | 2 | | Michael S |
11 Mar 24 | Re: Broken Date formats | 1 | | Michael S |
11 Mar 24 | Re: Capabilities, Anybody? | 7 | | Chris M. Thomasson |
12 Mar 24 | Re: Capabilities, Anybody? | 6 | | Chris M. Thomasson |
13 Mar 24 | Re: Capabilities, Anybody? | 5 | | BGB |
14 Mar 24 | Re: Capabilities, Anybody? | 4 | | Chris M. Thomasson |
14 Mar 24 | Re: Capabilities, Anybody? | 3 | | BGB |
14 Mar 24 | Re: Capabilities, Anybody? | 2 | | Chris M. Thomasson |
16 Mar 24 | Re: Capabilities, Anybody? | 1 | | BGB |
10 Mar 24 | Re: Capabilities, Anybody? | 33 | | BGB |
11 Mar 24 | Re: Capabilities, Anybody? | 32 | | Robert Finch |
11 Mar 24 | Re: Capabilities, Anybody? | 31 | | BGB |
13 Mar 24 | Re: Capabilities, Anybody? | 30 | | Robert Finch |
13 Mar 24 | Re: Capabilities, Anybody? | 24 | | MitchAlsup1 |
13 Mar 24 | Re: Capabilities, Anybody? | 23 | | Robert Finch |
13 Mar 24 | Re: Capabilities, Anybody? | 21 | | MitchAlsup1 |
14 Mar 24 | Re: Capabilities, Anybody? | 20 | | Robert Finch |
14 Mar 24 | Re: Capabilities, Anybody? | 1 | | Lawrence D'Oliveiro |
14 Mar 24 | Re: Capabilities, Anybody? | 18 | | MitchAlsup1 |
14 Mar 24 | Re: Capabilities, Anybody? | 17 | | Lawrence D'Oliveiro |
14 Mar 24 | Re: Capabilities, Anybody? | 10 | | MitchAlsup1 |
14 Mar 24 | Re: Capabilities, Anybody? | 9 | | Lawrence D'Oliveiro |
15 Mar 24 | Re: Capabilities, Anybody? | 8 | | MitchAlsup1 |
15 Mar 24 | Re: Capabilities, Anybody? | 2 | | Chris M. Thomasson |
15 Mar 24 | Re: Capabilities, Anybody? | 1 | | Chris M. Thomasson |
15 Mar 24 | Re: Capabilities, Anybody? | 5 | | Lawrence D'Oliveiro |
15 Mar 24 | Re: Capabilities, Anybody? | 4 | | Chris M. Thomasson |
15 Mar 24 | Re: Capabilities, Anybody? | 3 | | Lawrence D'Oliveiro |
15 Mar 24 | Re: Capabilities, Anybody? | 2 | | Lawrence D'Oliveiro |
15 Mar 24 | Re: Capabilities, Anybody? | 1 | | Chris M. Thomasson |
14 Mar 24 | Re: Capabilities, Anybody? | 5 | | Lawrence D'Oliveiro |
15 Mar 24 | Re: Capabilities, Anybody? | 4 | | MitchAlsup1 |
15 Mar 24 | Re: Capabilities, Anybody? | 1 | | Lawrence D'Oliveiro |
18 Mar 24 | Re: Capabilities, Anybody? | 1 | | Paul A. Clayton |
18 Mar 24 | Re: Capabilities, Anybody? | 1 | | MitchAlsup1 |
15 Mar 24 | Re: Capabilities, Anybody? | 1 | | MitchAlsup1 |
14 Mar 24 | Re: Capabilities, Anybody? | 1 | | Theo Markettos |
13 Mar 24 | Re: Capabilities, Anybody? | 5 | | BGB |
14 Mar 24 | Re: Capabilities, Anybody? | 4 | | Robert Finch |
14 Mar 24 | Re: Capabilities, Anybody? | 3 | | BGB |
14 Mar 24 | Re: Capabilities, Anybody? | 1 | | Lawrence D'Oliveiro |
15 Mar 24 | Re: Capabilities, Anybody? | 1 | | MitchAlsup1 |
10 Mar 24 | Re: Capabilities, Anybody? | 9 | | Theo Markettos |
11 Mar 24 | Re: Capabilities, Anybody? | 8 | | BGB |
11 Mar 24 | Re: Capabilities, Anybody? | 2 | | Robert Finch |
12 Mar 24 | Re: Capabilities, Anybody? | 1 | | BGB |
12 Mar 24 | Re: Capabilities, Anybody? | 2 | | BGB |
12 Mar 24 | Re: Capabilities, Anybody? | 1 | | MitchAlsup1 |
14 Mar 24 | Re: Capabilities, Anybody? | 3 | | Theo Markettos |
14 Mar 24 | Re: Capabilities, Anybody? | 1 | | MitchAlsup1 |
14 Mar 24 | Re: Capabilities, Anybody? | 1 | | BGB |
9 Mar 24 | Re: Capabilities, Anybody? | 1 | | Lawrence D'Oliveiro |
9 Mar 24 | Re: Capabilities, Anybody? | 3 | | Robert Finch |
9 Mar 24 | Re: Capabilities, Anybody? | 2 | | Lawrence D'Oliveiro |
9 Mar 24 | Re: Capabilities, Anybody? | 1 | | Robert Finch |