memory: Fix addr for flatview_access_allowed()

[PATCH] memory: Fix addr for flatview_access_allowed()

Posted by Peter Xu 3 weeks, 4 days ago

flatview_access_allowed() should pass in the address offset of the memory
region, rather than the global address space.

Shouldn't be a major issue yet, since the addr is only used in an error
log.

Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
Fixes: 3ab6fdc91b ("softmmu/physmem: Introduce MemTxAttrs::memory field and MEMTX_ACCESS_ERROR")
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 system/physmem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/system/physmem.c b/system/physmem.c
index f498572fc8..019118cf75 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -3027,7 +3027,7 @@ static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
 
     l = len;
     mr = flatview_translate(fv, addr, &mr_addr, &l, true, attrs);
-    if (!flatview_access_allowed(mr, attrs, addr, len)) {
+    if (!flatview_access_allowed(mr, attrs, mr_addr, len)) {
         return MEMTX_ACCESS_ERROR;
     }
     return flatview_write_continue(fv, addr, attrs, buf, len,
@@ -3118,7 +3118,7 @@ static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
 
     l = len;
     mr = flatview_translate(fv, addr, &mr_addr, &l, false, attrs);
-    if (!flatview_access_allowed(mr, attrs, addr, len)) {
+    if (!flatview_access_allowed(mr, attrs, mr_addr, len)) {
         return MEMTX_ACCESS_ERROR;
     }
     return flatview_read_continue(fv, addr, attrs, buf, len,
-- 
2.50.1

Re: [PATCH] memory: Fix addr for flatview_access_allowed()

Posted by Philippe Mathieu-Daudé 3 weeks, 4 days ago

On 2/9/25 23:40, Peter Xu wrote:
> flatview_access_allowed() should pass in the address offset of the memory
> region, rather than the global address space.
> 
> Shouldn't be a major issue yet, since the addr is only used in an error
> log.
> 
> Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
> Fixes: 3ab6fdc91b ("softmmu/physmem: Introduce MemTxAttrs::memory field and MEMTX_ACCESS_ERROR")
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>   system/physmem.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/system/physmem.c b/system/physmem.c
> index f498572fc8..019118cf75 100644
> --- a/system/physmem.c
> +++ b/system/physmem.c
> @@ -3027,7 +3027,7 @@ static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
>   
>       l = len;
>       mr = flatview_translate(fv, addr, &mr_addr, &l, true, attrs);
> -    if (!flatview_access_allowed(mr, attrs, addr, len)) {
> +    if (!flatview_access_allowed(mr, attrs, mr_addr, len)) {

Right, but shouldn't we also use the translated length?

        if (!flatview_access_allowed(mr, attrs, mr_addr, l)) {

>           return MEMTX_ACCESS_ERROR;
>       }
>       return flatview_write_continue(fv, addr, attrs, buf, len,
> @@ -3118,7 +3118,7 @@ static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
>   
>       l = len;
>       mr = flatview_translate(fv, addr, &mr_addr, &l, false, attrs);
> -    if (!flatview_access_allowed(mr, attrs, addr, len)) {
> +    if (!flatview_access_allowed(mr, attrs, mr_addr, len)) {

Ditto.

>           return MEMTX_ACCESS_ERROR;
>       }
>       return flatview_read_continue(fv, addr, attrs, buf, len,

Re: [PATCH] memory: Fix addr for flatview_access_allowed()

Posted by Peter Xu 3 weeks, 4 days ago

On Wed, Sep 03, 2025 at 12:38:19PM +0200, Philippe Mathieu-Daudé wrote:
> On 2/9/25 23:40, Peter Xu wrote:
> > flatview_access_allowed() should pass in the address offset of the memory
> > region, rather than the global address space.
> > 
> > Shouldn't be a major issue yet, since the addr is only used in an error
> > log.
> > 
> > Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
> > Fixes: 3ab6fdc91b ("softmmu/physmem: Introduce MemTxAttrs::memory field and MEMTX_ACCESS_ERROR")
> > Signed-off-by: Peter Xu <peterx@redhat.com>
> > ---
> >   system/physmem.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/system/physmem.c b/system/physmem.c
> > index f498572fc8..019118cf75 100644
> > --- a/system/physmem.c
> > +++ b/system/physmem.c
> > @@ -3027,7 +3027,7 @@ static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
> >       l = len;
> >       mr = flatview_translate(fv, addr, &mr_addr, &l, true, attrs);
> > -    if (!flatview_access_allowed(mr, attrs, addr, len)) {
> > +    if (!flatview_access_allowed(mr, attrs, mr_addr, len)) {
> 
> Right, but shouldn't we also use the translated length?
> 
>        if (!flatview_access_allowed(mr, attrs, mr_addr, l)) {

Yes.. I'll repost, thanks. :)

> 
> >           return MEMTX_ACCESS_ERROR;
> >       }
> >       return flatview_write_continue(fv, addr, attrs, buf, len,
> > @@ -3118,7 +3118,7 @@ static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
> >       l = len;
> >       mr = flatview_translate(fv, addr, &mr_addr, &l, false, attrs);
> > -    if (!flatview_access_allowed(mr, attrs, addr, len)) {
> > +    if (!flatview_access_allowed(mr, attrs, mr_addr, len)) {
> 
> Ditto.
> 
> >           return MEMTX_ACCESS_ERROR;
> >       }
> >       return flatview_read_continue(fv, addr, attrs, buf, len,
> 

-- 
Peter Xu

Re: [PATCH] memory: Fix addr for flatview_access_allowed()

Posted by David Hildenbrand 3 weeks, 4 days ago

On 02.09.25 23:40, Peter Xu wrote:
> flatview_access_allowed() should pass in the address offset of the memory
> region, rather than the global address space.
> 
> Shouldn't be a major issue yet, since the addr is only used in an error
> log.
> 
> Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
> Fixes: 3ab6fdc91b ("softmmu/physmem: Introduce MemTxAttrs::memory field and MEMTX_ACCESS_ERROR")
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Cheers

David / dhildenb