On 08/10/2016 06:30 PM, Steffen Maier wrote:
> commit 2c55b750a884b86dea8b4cc5f15e1484cc47a25c
> ("[SCSI] zfcp: Redesign of the debug tracing for SAN records.")
> started to add FC_CT_HDR_LEN which made zfcp dump random data
> out of bounds for RSPN GS responses because u.rspn.rsp
> is the largest and last field in the union of struct zfcp_fc_req.
> Other request/response types only happened to stay within bounds
> due to the padding of the union or
> due to the trace capping of u.gspn.rsp to ZFCP_DBF_SAN_MAX_PAYLOAD.
>
> Timestamp : ...
> Area : SAN
> Subarea : 00
> Level : 1
> Exception : -
> CPU id : ..
> Caller : ...
> Record id : 2
> Tag : fsscth2
> Request id : 0x...
> Destination ID : 0x00fffffc
> Payload short : 01000000 fc020000 80020000 00000000
> xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx <===
> 00000000 00000000 00000000 00000000
> Payload length : 32 <===
>
> struct zfcp_fc_req {
> [0] struct zfcp_fsf_ct_els ct_els;
> [56] struct scatterlist sg_req;
> [96] struct scatterlist sg_rsp;
> union {
> struct {req; rsp;} adisc; SIZE: 28+28= 56
> struct {req; rsp;} gid_pn; SIZE: 24+20= 44
> struct {rspsg; req;} gpn_ft; SIZE: 40*4+20=180
> struct {req; rsp;} gspn; SIZE: 20+273= 293
> struct {req; rsp;} rspn; SIZE: 277+16= 293
> [136] } u;
> }
> SIZE: 432
>
> Signed-off-by: Steffen Maier <maier@xxxxxxxxxxxxxxxxxx>
> Fixes: 2c55b750a884 ("[SCSI] zfcp: Redesign of the debug tracing for SAN records.")
> Cc: <stable@xxxxxxxxxxxxxxx> #2.6.38+
> Reviewed-by: Alexey Ishchuk <aishchuk@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Benjamin Block <bblock@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/s390/scsi/zfcp_dbf.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
> index 968897f5e1c6..d8c0bfb40366 100644
> --- a/drivers/s390/scsi/zfcp_dbf.c
> +++ b/drivers/s390/scsi/zfcp_dbf.c
> @@ -389,7 +389,7 @@ void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
> struct zfcp_fsf_ct_els *ct_els = fsf->data;
> u16 length;
>
> - length = (u16)(ct_els->req->length + FC_CT_HDR_LEN);
> + length = (u16)(ct_els->req->length);
> zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
> fsf->req_id, d_id);
> }
> @@ -405,7 +405,7 @@ void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
> struct zfcp_fsf_ct_els *ct_els = fsf->data;
> u16 length;
>
> - length = (u16)(ct_els->resp->length + FC_CT_HDR_LEN);
> + length = (u16)(ct_els->resp->length);
> zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
> fsf->req_id, ct_els->d_id);
> }
>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@xxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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