-----Original Message-----
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Wednesday, 13 November 2013 7:36 pm
To: Vikas <vikas.chaudhary@xxxxxxxxxx>
Cc: Adheer Chandravanshi <adheer.chandravanshi@xxxxxxxxxx>, Dept-Eng iSCSI
Driver <Dept-iSCSIDriver@xxxxxxxxxx>, "James E.J. Bottomley"
<JBottomley@xxxxxxxxxxxxx>, scsi <linux-scsi@xxxxxxxxxxxxxxx>,
"kernel-janitors@xxxxxxxxxxxxxxx" <kernel-janitors@xxxxxxxxxxxxxxx>, "Eric
W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject: Re: [patch] [SCSI] qla4xxx: overflow in qla4xxx_set_chap_entry()
>On Wed, Nov 13, 2013 at 03:08:12PM +0300, Dan Carpenter wrote:
>> On Wed, Nov 13, 2013 at 11:52:37AM +0000, Vikas Chaudhary wrote:
>> >
>> >
>> > -----Original Message-----
>> > From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>> > Date: Wednesday, 13 November 2013 1:18 pm
>> > To: Vikas <vikas.chaudhary@xxxxxxxxxx>, Adheer Chandravanshi
>> > <adheer.chandravanshi@xxxxxxxxxx>
>> > Cc: Dept-Eng iSCSI Driver <Dept-iSCSIDriver@xxxxxxxxxx>, "James E.J.
>> > Bottomley" <JBottomley@xxxxxxxxxxxxx>, scsi
>><linux-scsi@xxxxxxxxxxxxxxx>,
>> > "kernel-janitors@xxxxxxxxxxxxxxx" <kernel-janitors@xxxxxxxxxxxxxxx>
>> > Subject: [patch] [SCSI] qla4xxx: overflow in qla4xxx_set_chap_entry()
>> >
>> > >We should cap the size of memcpy() because it comes from the network
>> > >and can't be trusted.
>> >
>> > This patch is on assumption that data is coming from network,
>> > but in this case data come from application (iscsiadm) with correct
>>length.
>> >
>>
>> No, that doesn't work. We don't trust user space.
>
>Btw, the is especially true with network namespaces... These days
>anyone who is ns_capable() could overflow the buffer after:
>df008c91f835 ('net: Allow userns root to control llc, netfilter, netlink,
>packet, and xfrm')
Agreed, We can¹t trust user space.
Acked-by: Vikas Chaudhary <vikas.chaudhary@xxxxxxxxxx>
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