-----Original Message----- From: Maxime Coquelin [mailto:[email protected]] Sent: Monday, 2 October, 2017 17:07 To: Jastrzebski, MichalX K <[email protected]>; [email protected] Cc: [email protected]; Jain, Deepak K <[email protected]>; Piasecki, JacekX <[email protected]>; Liu, Changpeng <[email protected]>; [email protected] Subject: Re: [dpdk-dev] [PATCH] examples/vhost_scsi: fix buffer not terminated
On 10/02/2017 03:50 PM, Jastrzebski, MichalX K wrote: >> -----Original Message----- >> From: dev [mailto:[email protected]] On Behalf Of Michal >> Jastrzebski >> Sent: Friday, September 22, 2017 3:08 PM >> To: [email protected]; [email protected] >> Cc: [email protected]; Jain, Deepak K <[email protected]>; Piasecki, >> JacekX <[email protected]>; Liu, Changpeng >> <[email protected]>; [email protected] >> Subject: [dpdk-dev] [PATCH] examples/vhost_scsi: fix buffer not >> terminated >> >> From: Jacek Piasecki <[email protected]> >> >> Fix size of buffer in strcpy. There was possible to get not >> terminated string after copy operation. >> >> Coverity issue: 158631 >> Fixes: db75c7af19bb ("examples/vhost_scsi: introduce a new sample >> app") >> Cc: [email protected] >> Cc: [email protected] >> >> Signed-off-by: Jacek Piasecki <[email protected]> >> --- >> examples/vhost_scsi/scsi.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/examples/vhost_scsi/scsi.c b/examples/vhost_scsi/scsi.c >> index 54d3104..de9639a 100644 >> --- a/examples/vhost_scsi/scsi.c >> +++ b/examples/vhost_scsi/scsi.c >> @@ -307,7 +307,8 @@ >> strncpy((char *)inqdata->t10_vendor_id, "INTEL", 8); >> >> /* PRODUCT IDENTIFICATION */ >> - strncpy((char *)inqdata->product_id, bdev->product_name, >> 16); >> + strncpy((char *)inqdata->product_id, bdev->product_name, >> + ARRAY_SIZE(inqdata->product_id) - 1); Does it assume that product_id is memzero'ed before? IIUC strncpy manpage, it wouldn't protect against non-null terminated strings if it is not the case: Yes, I assumed that this area is zeroed before strncpy. Earlier there is a casting from *task to *inqdata (*task is zmalloced). To be sure that the destination area is clear I propose to add: memset(inqdata->product_id, 0, ARRAY_SIZE(inqdata->product_id)); before strncpy. Would that be OK? Regards, Jacek >> >> /* PRODUCT REVISION LEVEL */ >> strncpy((char *)inqdata->product_rev, "0001", 4); >> -- >> 1.9.1 > > Hi Yu / Maxime, > I would like to ask for a feedback regarding proposed fix. > If everything is ok with it, please send acked-by. > > Best regards > Michal. >
