netdev - Re: [PATCH net] tg3: Expand 4g_overflow_test workaround to skb fragments of any size.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <52B39EF6.9080006@broadcom.com>
Date:	Thu, 19 Dec 2013 17:35:50 -0800
From:	Nithin Nayak Sujir <nsujir@...adcom.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>,
	<stable@...r.kernel.org>, Michael Chan <mchan@...adcom.com>
Subject: Re: [PATCH net] tg3: Expand 4g_overflow_test workaround to skb fragments
 of any size.



On 12/19/2013 04:41 PM, Eric Dumazet wrote:
> On Thu, 2013-12-19 at 16:24 -0800, Nithin Nayak Sujir wrote:
>> The current driver assumes that an skb fragment can only be upto jumbo
>> size. Presumably this was a fast-path optimization. This assumption is
>> no longer true as fragments can be upto 32k.
>>
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Nithin Nayak Sujir <nsujir@...adcom.com>
>> Signed-off-by: Michael Chan <mchan@...adcom.com>
>> ---
>>   drivers/net/ethernet/broadcom/tg3.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
>> index f3dd93b..8ab21d7 100644
>> --- a/drivers/net/ethernet/broadcom/tg3.c
>> +++ b/drivers/net/ethernet/broadcom/tg3.c
>> @@ -7622,7 +7622,7 @@ static inline int tg3_4g_overflow_test(dma_addr_t mapping, int len)
>>   {
>>   	u32 base = (u32) mapping & 0xffffffff;
>>
>> -	return (base > 0xffffdcc0) && (base + len + 8 < base);
>> +	return (base + len + 8 < base);
>>   }
>>
>>   /* Test for TSO DMA buffers that cross into regions which are within MSS bytes
>
> btw this is also :
>
> return base + len + 8 < base;
>
>
>

I'll send a v2.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html