linux-kernel - Re: [PATCH] tty: Add EXTPROC support for LINEMODE

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:	Thu, 17 Jun 2010 14:23:07 -0700
From:	Howard Chu <hyc@...as.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] tty: Add EXTPROC support for LINEMODE

Alan Cox wrote:
>>>> For Alpha this value should match OSF if possible.
>>
>> OSF didn't define this flag, nor did it assign that particular bit to any
>> purpose. Is that good enough?
>
> Fine
>
>>> Are you suggesting that this is completely unfixable/unworkable? Would it be
>>> sufficient to use kernel_termios_to_user_termios() ?
>
> I don't see a way to fix it sanely
>
>>>
>> Actually using kernel_termios_to_user_termios_1(). In all supported
>> architectures this structure is basically aligned with but smaller than the
>> userland struct termios.
>
> The relationship isn't quite so simple and it may change in the future,
> so this seems to be a very bad idea. Besides which syscalls are *cheap*
> so simply notifying someone to reread the terminal data they care about
> should be fine. In that sense it seems SVR4 got it right.

OK. I'm fine with only setting a bit in the packet header, and letting the 
application do an ioctl/tcgetattr to discover the actual state. Next question 
is, should this bit still be called TIOCPKT_IOCTL (which BSD uses) or should 
it be called something else, since the behavior is not the same as BSD?

-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/
--
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/