linux-kernel - Re: aio: compat

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]

Date:	Tue, 09 Mar 2010 01:41:36 +0300
From:	Michael Tokarev <mjt@....msk.ru>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	linux-aio@...ck.org, Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: aio: compat_ioctl issue?

Michael Tokarev wrote:
> Jeff Moyer wrote:
> []
>>>>> I just come across a situation (next in a long row :)
>>>>> when on x86, 32bit userspace does not work with 64bit
>>>>> kernel.  This time this is about aio requests.
>> [snip]
[]
>> Could you maybe print out the values that are passed to io_getevents?
> 
> They were in my first email, here it goes again:
> 
> io_submit: lio_opcode=7 reqprio=0 iov=0x9cd7018{0xf5599000,4096}, niov=1, offset=0
> io_getevents: expected 4096 got -22 (EINVAL)
> 
> This is what gets passed to libaio -- strace here
> does not decode the arguments unfortunately.
[]
> My *guess* is that it handles read/write correctly but
> does not properly handle preadv/pwritev (opcode=7 is
> IO_CMD_PREADV as far as I can see).  That'll explain
> my "testcase" with Oracle which does not use preadv.

Actually, looking at the code in fs/compat.c, I don't see
where it converts iovecs.  Yes it converts iocbs, but for
readv/writev it also needs to convert iovecs.  Oh well,
that expects to be quite painful... :(

> Thanks!
> 
> /mjt
> --
> 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/

--
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/