* Re: [PATCH] xen/pciback: Fix conf_space read/write overlap check.
[not found] <1466519876-7205-1-git-send-email-andrey2805@gmail.com>
@ 2016-06-21 15:52 ` Boris Ostrovsky
2016-06-22 4:11 ` Juergen Gross
0 siblings, 1 reply; 2+ messages in thread
From: Boris Ostrovsky @ 2016-06-21 15:52 UTC (permalink / raw)
To: Andrey Grodzovsky, xen-devel
Cc: jw, Jan Beulich, stable, David Vrabel, Juergen Gross,
Linux Kernel Mailing List
On 06/21/2016 10:37 AM, Andrey Grodzovsky wrote:
> Current overlap check is evaluating to false a case where a filter field
> is fully contained (proper subset) of a r/w request.
> This change applies classical overlap check instead to include
> all the scenarios.
>
> Related to https://www.mail-archive.com/xen-devel@lists.xen.org/msg72174.html
>
> Cc: Jan Beulich <JBeulich@suse.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: stable@vger.kernel.org
> Signed-off-by: Andrey Grodzovsky <andrey2805@gmail.com>
+ David and Juergen (maintainers) and kernel list.
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> ---
> drivers/xen/xen-pciback/conf_space.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
> index 8e67336..6a25533 100644
> --- a/drivers/xen/xen-pciback/conf_space.c
> +++ b/drivers/xen/xen-pciback/conf_space.c
> @@ -183,8 +183,7 @@ int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
> field_start = OFFSET(cfg_entry);
> field_end = OFFSET(cfg_entry) + field->size;
>
> - if ((req_start >= field_start && req_start < field_end)
> - || (req_end > field_start && req_end <= field_end)) {
> + if (req_end > field_start && field_end > req_start) {
> err = conf_space_read(dev, cfg_entry, field_start,
> &tmp_val);
> if (err)
> @@ -230,8 +229,7 @@ int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value)
> field_start = OFFSET(cfg_entry);
> field_end = OFFSET(cfg_entry) + field->size;
>
> - if ((req_start >= field_start && req_start < field_end)
> - || (req_end > field_start && req_end <= field_end)) {
> + if (req_end > field_start && field_end > req_start) {
> tmp_val = 0;
>
> err = xen_pcibk_config_read(dev, field_start,
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] xen/pciback: Fix conf_space read/write overlap check.
2016-06-21 15:52 ` [PATCH] xen/pciback: Fix conf_space read/write overlap check Boris Ostrovsky
@ 2016-06-22 4:11 ` Juergen Gross
0 siblings, 0 replies; 2+ messages in thread
From: Juergen Gross @ 2016-06-22 4:11 UTC (permalink / raw)
To: Boris Ostrovsky, Andrey Grodzovsky, xen-devel
Cc: jw, Jan Beulich, stable, David Vrabel, Linux Kernel Mailing List
On 21/06/16 17:52, Boris Ostrovsky wrote:
> On 06/21/2016 10:37 AM, Andrey Grodzovsky wrote:
>> Current overlap check is evaluating to false a case where a filter field
>> is fully contained (proper subset) of a r/w request.
>> This change applies classical overlap check instead to include
>> all the scenarios.
>>
>> Related to https://www.mail-archive.com/xen-devel@lists.xen.org/msg72174.html
>>
>> Cc: Jan Beulich <JBeulich@suse.com>
>> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Andrey Grodzovsky <andrey2805@gmail.com>
>
> + David and Juergen (maintainers) and kernel list.
>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Juergen Gross <jgross@suse.com>
>
>
>> ---
>> drivers/xen/xen-pciback/conf_space.c | 6 ++----
>> 1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
>> index 8e67336..6a25533 100644
>> --- a/drivers/xen/xen-pciback/conf_space.c
>> +++ b/drivers/xen/xen-pciback/conf_space.c
>> @@ -183,8 +183,7 @@ int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
>> field_start = OFFSET(cfg_entry);
>> field_end = OFFSET(cfg_entry) + field->size;
>>
>> - if ((req_start >= field_start && req_start < field_end)
>> - || (req_end > field_start && req_end <= field_end)) {
>> + if (req_end > field_start && field_end > req_start) {
>> err = conf_space_read(dev, cfg_entry, field_start,
>> &tmp_val);
>> if (err)
>> @@ -230,8 +229,7 @@ int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value)
>> field_start = OFFSET(cfg_entry);
>> field_end = OFFSET(cfg_entry) + field->size;
>>
>> - if ((req_start >= field_start && req_start < field_end)
>> - || (req_end > field_start && req_end <= field_end)) {
>> + if (req_end > field_start && field_end > req_start) {
>> tmp_val = 0;
>>
>> err = xen_pcibk_config_read(dev, field_start,
>
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-06-21 15:52 ` [PATCH] xen/pciback: Fix conf_space read/write overlap check Boris Ostrovsky
2016-06-22 4:11 ` Juergen Gross
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