linux-kernel - Re: [PATCH take2 1/5] dio: centralize completion in dio

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

Message-ID: <4522ECA8.4090906@oracle.com>
Date:	Tue, 03 Oct 2006 16:05:12 -0700
From:	Zach Brown <zach.brown@...cle.com>
To:	Andrew Morton <akpm@...l.org>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-aio@...ck.org
Subject: Re: [PATCH take2 1/5] dio: centralize completion in dio_complete()


>> -static void dio_complete(struct dio *dio, loff_t offset, ssize_t bytes)
>> +static int dio_complete(struct dio *dio, loff_t offset, int ret)
>>  {
>> +	ssize_t transferred = 0;
>> +
>> +	if (dio->result) {
>> +		transferred = dio->result;
>> +
>> +		/* Check for short read case */
>> +		if ((dio->rw == READ) && ((offset + transferred) > dio->i_size))
>> +			transferred = dio->i_size - offset;
> 
> On 32-bit machines ssize_t is `int' and loff_t is `long long'.  I guess
> `transferred' cannot overflow because you can't write >4G.  And I guess
> `transferred' cannot go negative because you cannot write >=2G.  Can you
> confirm that thinking?

Well, I think this ssize_t mirrors the return types for the read and
write syscalls and match the ssize_t wrapping checks on input by
rw_verify_area() and do_readv_writev().  I *think* that covers it,
though I haven't really audited all the ways to get to this code.

- z
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/