* [PATCH] xen/pciback: Fix conf_space read/write overlap check.
@ 2016-06-21 14:37 Andrey Grodzovsky
2016-06-21 15:52 ` Boris Ostrovsky
2016-06-21 17:15 ` [Xen-devel] " David Vrabel
0 siblings, 2 replies; 5+ messages in thread
From: Andrey Grodzovsky @ 2016-06-21 14:37 UTC (permalink / raw)
To: xen-devel; +Cc: jw, Andrey Grodzovsky, Jan Beulich, Boris Ostrovsky, stable
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>
---
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,
--
2.1.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] xen/pciback: Fix conf_space read/write overlap check.
2016-06-21 14:37 [PATCH] xen/pciback: Fix conf_space read/write overlap check Andrey Grodzovsky
@ 2016-06-21 15:52 ` Boris Ostrovsky
2016-06-22 4:11 ` Juergen Gross
2016-06-21 17:15 ` [Xen-devel] " David Vrabel
1 sibling, 1 reply; 5+ 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] 5+ messages in thread
* Re: [Xen-devel] [PATCH] xen/pciback: Fix conf_space read/write overlap check.
2016-06-21 14:37 [PATCH] xen/pciback: Fix conf_space read/write overlap check Andrey Grodzovsky
2016-06-21 15:52 ` Boris Ostrovsky
@ 2016-06-21 17:15 ` David Vrabel
1 sibling, 0 replies; 5+ messages in thread
From: David Vrabel @ 2016-06-21 17:15 UTC (permalink / raw)
To: Andrey Grodzovsky, xen-devel; +Cc: Boris Ostrovsky, stable, Jan Beulich, jw
On 21/06/16 15:37, 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.
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
But the commit message could do with a concrete example of an access
that failed.
David
>
> 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>
> ---
> 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] 5+ messages in thread
* Re: [PATCH] xen/pciback: Fix conf_space read/write overlap check.
2016-06-21 15:52 ` Boris Ostrovsky
@ 2016-06-22 4:11 ` Juergen Gross
0 siblings, 0 replies; 5+ 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] 5+ messages in thread
* Re: [Xen-devel] [PATCH] xen/pciback: Fix conf_space read/write overlap check.
2016-06-21 18:26 Andrey Grodzovsky
@ 2016-06-23 9:56 ` David Vrabel
0 siblings, 0 replies; 5+ messages in thread
From: David Vrabel @ 2016-06-23 9:56 UTC (permalink / raw)
To: Andrey Grodzovsky, xen-devel
Cc: jw, stable, david.vrabel, Jan Beulich, Boris Ostrovsky
On 21/06/16 19:26, 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.
>
> More specifically, for (Hilscher GmbH CIFX 50E-DP(M/S)) device
> driver the logic is such that the entire confspace is read and
> written in 4 byte chunks.In this case as an example, CACHE_LINE_SIZE,
> LATENCY_TIMER and PCI_BIST are arriving together in one call to
> xen_pcibk_config_write with offset == 0xc and size == 4.
> With the exsisting overlap check LATENCY_TIMER field
> (offset == 0xd, length == 1) is fully contained in the write request
> and hence is excluded from write, which is incorrect.
Applied to for-linus-4.7b, thanks.
David
^ permalink raw reply [flat|nested] 5+ messages in thread
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2016-06-21 14:37 [PATCH] xen/pciback: Fix conf_space read/write overlap check Andrey Grodzovsky
2016-06-21 15:52 ` Boris Ostrovsky
2016-06-22 4:11 ` Juergen Gross
2016-06-21 17:15 ` [Xen-devel] " David Vrabel
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2016-06-23 9:56 ` [Xen-devel] " David Vrabel
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