* [PATCH v2][next] scsi: lpfc: Use struct_size() helper
@ 2023-05-23 20:16 Gustavo A. R. Silva
2023-05-24 5:25 ` Justin Tee
0 siblings, 1 reply; 6+ messages in thread
From: Gustavo A. R. Silva @ 2023-05-23 20:16 UTC (permalink / raw)
To: James Smart, Dick Kennedy, James E.J. Bottomley, Martin K. Petersen
Cc: linux-scsi, linux-kernel, Gustavo A. R. Silva, linux-hardening,
Kees Cook
Prefer struct_size() over open-coded versions of idiom:
sizeof(struct-with-flex-array) + sizeof(typeof-flex-array-elements) * count
where count is the max number of items the flexible array is supposed to
contain.
Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
Changes in v2:
- Use literal 1 in call to struct_size(), instead of rap->no_of_objects
(Kees Cook).
v1:
- Link: https://lore.kernel.org/linux-hardening/99e06733f5f35c6cd62e05f530b93107bfd03362.1684358315.git.gustavoars@kernel.org/
drivers/scsi/lpfc/lpfc_ct.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_ct.c b/drivers/scsi/lpfc/lpfc_ct.c
index e880d127d7f5..f52aeb73af8d 100644
--- a/drivers/scsi/lpfc/lpfc_ct.c
+++ b/drivers/scsi/lpfc/lpfc_ct.c
@@ -3747,9 +3747,7 @@ lpfc_vmid_cmd(struct lpfc_vport *vport,
rap->no_of_objects = cpu_to_be32(1);
rap->obj[0].entity_id_len = vmid->vmid_len;
memcpy(rap->obj[0].entity_id, vmid->host_vmid, vmid->vmid_len);
- size = RAPP_IDENT_OFFSET +
- sizeof(struct lpfc_vmid_rapp_ident_list) +
- sizeof(struct entity_id_object);
+ size = RAPP_IDENT_OFFSET + struct_size(rap, obj, 1);
retry = 1;
break;
@@ -3767,9 +3765,7 @@ lpfc_vmid_cmd(struct lpfc_vport *vport,
dap->no_of_objects = cpu_to_be32(1);
dap->obj[0].entity_id_len = vmid->vmid_len;
memcpy(dap->obj[0].entity_id, vmid->host_vmid, vmid->vmid_len);
- size = DAPP_IDENT_OFFSET +
- sizeof(struct lpfc_vmid_dapp_ident_list) +
- sizeof(struct entity_id_object);
+ size = DAPP_IDENT_OFFSET + struct_size(dap, obj, 1);
write_lock(&vport->vmid_lock);
vmid->flag &= ~LPFC_VMID_REGISTERED;
write_unlock(&vport->vmid_lock);
--
2.34.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2][next] scsi: lpfc: Use struct_size() helper
2023-05-23 20:16 [PATCH v2][next] scsi: lpfc: Use struct_size() helper Gustavo A. R. Silva
@ 2023-05-24 5:25 ` Justin Tee
2023-05-26 17:41 ` Kees Cook
0 siblings, 1 reply; 6+ messages in thread
From: Justin Tee @ 2023-05-24 5:25 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: James Smart, Dick Kennedy, James E.J. Bottomley,
Martin K. Petersen, linux-scsi, linux-kernel, linux-hardening,
Kees Cook, Justin Tee
no_of_objects may be hardcoded to 1 right now, but does it make more
sense to use?
struct_size(rap, obj, be32_to_cpu(rap->no_of_objects));
We probably should have declared no_of_objects as __be32 to have
avoided this confusion.
On Tue, May 23, 2023 at 1:33 PM Gustavo A. R. Silva
<gustavoars@kernel.org> wrote:
>
> Prefer struct_size() over open-coded versions of idiom:
>
> sizeof(struct-with-flex-array) + sizeof(typeof-flex-array-elements) * count
>
> where count is the max number of items the flexible array is supposed to
> contain.
>
> Link: https://github.com/KSPP/linux/issues/160
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> Changes in v2:
> - Use literal 1 in call to struct_size(), instead of rap->no_of_objects
> (Kees Cook).
>
> v1:
> - Link: https://lore.kernel.org/linux-hardening/99e06733f5f35c6cd62e05f530b93107bfd03362.1684358315.git.gustavoars@kernel.org/
>
> drivers/scsi/lpfc/lpfc_ct.c | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc_ct.c b/drivers/scsi/lpfc/lpfc_ct.c
> index e880d127d7f5..f52aeb73af8d 100644
> --- a/drivers/scsi/lpfc/lpfc_ct.c
> +++ b/drivers/scsi/lpfc/lpfc_ct.c
> @@ -3747,9 +3747,7 @@ lpfc_vmid_cmd(struct lpfc_vport *vport,
> rap->no_of_objects = cpu_to_be32(1);
> rap->obj[0].entity_id_len = vmid->vmid_len;
> memcpy(rap->obj[0].entity_id, vmid->host_vmid, vmid->vmid_len);
> - size = RAPP_IDENT_OFFSET +
> - sizeof(struct lpfc_vmid_rapp_ident_list) +
> - sizeof(struct entity_id_object);
> + size = RAPP_IDENT_OFFSET + struct_size(rap, obj, 1);
> retry = 1;
> break;
>
> @@ -3767,9 +3765,7 @@ lpfc_vmid_cmd(struct lpfc_vport *vport,
> dap->no_of_objects = cpu_to_be32(1);
> dap->obj[0].entity_id_len = vmid->vmid_len;
> memcpy(dap->obj[0].entity_id, vmid->host_vmid, vmid->vmid_len);
> - size = DAPP_IDENT_OFFSET +
> - sizeof(struct lpfc_vmid_dapp_ident_list) +
> - sizeof(struct entity_id_object);
> + size = DAPP_IDENT_OFFSET + struct_size(dap, obj, 1);
> write_lock(&vport->vmid_lock);
> vmid->flag &= ~LPFC_VMID_REGISTERED;
> write_unlock(&vport->vmid_lock);
> --
> 2.34.1
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2][next] scsi: lpfc: Use struct_size() helper
2023-05-24 5:25 ` Justin Tee
@ 2023-05-26 17:41 ` Kees Cook
2023-05-26 18:06 ` Justin Tee
0 siblings, 1 reply; 6+ messages in thread
From: Kees Cook @ 2023-05-26 17:41 UTC (permalink / raw)
To: Justin Tee
Cc: Gustavo A. R. Silva, James Smart, Dick Kennedy,
James E.J. Bottomley, Martin K. Petersen, linux-scsi,
linux-kernel, linux-hardening, Justin Tee
On Tue, May 23, 2023 at 10:25:20PM -0700, Justin Tee wrote:
> no_of_objects may be hardcoded to 1 right now, but does it make more
> sense to use?
>
> struct_size(rap, obj, be32_to_cpu(rap->no_of_objects));
Oh yeah, that's nicer. :)
> We probably should have declared no_of_objects as __be32 to have
> avoided this confusion.
Perhaps this patch can add that too?
--
Kees Cook
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2][next] scsi: lpfc: Use struct_size() helper
2023-05-26 17:41 ` Kees Cook
@ 2023-05-26 18:06 ` Justin Tee
2023-05-31 15:26 ` Martin K. Petersen
0 siblings, 1 reply; 6+ messages in thread
From: Justin Tee @ 2023-05-26 18:06 UTC (permalink / raw)
To: Kees Cook
Cc: Justin Tee, Gustavo A. R. Silva, James Smart, Dick Kennedy,
James E.J. Bottomley, Martin K. Petersen, linux-scsi,
linux-kernel, linux-hardening
[-- Attachment #1: Type: text/plain, Size: 1485 bytes --]
> > We probably should have declared no_of_objects as __be32 to have
> > avoided this confusion.
>
> Perhaps this patch can add that too?
Yes, please. Something like this is fine:
diff --git a/drivers/scsi/lpfc/lpfc_hw.h b/drivers/scsi/lpfc/lpfc_hw.h
index 19b2d2754f32..e5a639d96122 100644
--- a/drivers/scsi/lpfc/lpfc_hw.h
+++ b/drivers/scsi/lpfc/lpfc_hw.h
@@ -1414,12 +1414,12 @@ struct app_id_object {
};
struct lpfc_vmid_rapp_ident_list {
- uint32_t no_of_objects;
+ __be32 no_of_objects;
struct entity_id_object obj[1];
};
struct lpfc_vmid_dapp_ident_list {
- uint32_t no_of_objects;
+ __be32 no_of_objects;
struct entity_id_object obj[1];
};
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^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2][next] scsi: lpfc: Use struct_size() helper
2023-05-26 18:06 ` Justin Tee
@ 2023-05-31 15:26 ` Martin K. Petersen
2023-05-31 21:59 ` Justin Tee
0 siblings, 1 reply; 6+ messages in thread
From: Martin K. Petersen @ 2023-05-31 15:26 UTC (permalink / raw)
To: Justin Tee
Cc: Kees Cook, Justin Tee, Gustavo A. R. Silva, James Smart,
Dick Kennedy, James E.J. Bottomley, Martin K. Petersen,
linux-scsi, linux-kernel, linux-hardening
Gustavo/Justin,
>> > We probably should have declared no_of_objects as __be32 to have
>> > avoided this confusion.
>>
>> Perhaps this patch can add that too?
>
> Yes, please. Something like this is fine:
Please send a formal patch. Thanks!
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2][next] scsi: lpfc: Use struct_size() helper
2023-05-31 15:26 ` Martin K. Petersen
@ 2023-05-31 21:59 ` Justin Tee
0 siblings, 0 replies; 6+ messages in thread
From: Justin Tee @ 2023-05-31 21:59 UTC (permalink / raw)
To: Martin K. Petersen
Cc: Kees Cook, Justin Tee, Gustavo A. R. Silva, James Smart,
Dick Kennedy, James E.J. Bottomley, linux-scsi, linux-kernel,
linux-hardening
[-- Attachment #1: Type: text/plain, Size: 1542 bytes --]
Hi Martin,
Sure, will do. I'll post the formal patch shortly.
The __be32 no_of_objects comment can be ignored for this patch as I've
already incorporated that into another patch with subject line: [PATCH
1/1] lpfc: Fix incorrect big endian type assignments in FDMI and VMID
paths
Thanks,
Justin
On Wed, May 31, 2023 at 8:27 AM Martin K. Petersen
<martin.petersen@oracle.com> wrote:
>
>
> Gustavo/Justin,
>
> >> > We probably should have declared no_of_objects as __be32 to have
> >> > avoided this confusion.
> >>
> >> Perhaps this patch can add that too?
> >
> > Yes, please. Something like this is fine:
>
> Please send a formal patch. Thanks!
>
> --
> Martin K. Petersen Oracle Linux Engineering
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