Subject: Re: SA/pthread syscall versioning
To: Christos Zoulas <firstname.lastname@example.org>
From: Matt Thomas <email@example.com>
Date: 12/11/2003 16:17:52
On Dec 11, 2003, at 11:40 AM, Christos Zoulas wrote:
> In article <59A6FF24-2C04-11D8-A844-000A957020BC@3am-software.com>,
> Matt Thomas <firstname.lastname@example.org> wrote:
>> On Dec 11, 2003, at 8:55 AM, Christos Zoulas wrote:
>>> BTW, this is the case [leaking kernel memory info] in many of the
>>> machdep.c files (sparc,sparc64,vax, etc.) It did not seem important
>>> the time, but maybe we should bring it up for discussion again.
>> The vax implementation (and powerpc) does not leak kernel memory info.
>> However, it will leave portions of the siginfo_t that are not
>> by ksiginfo_t unchanged. That is not a kernel memory leak.
> Yes, that's it. It leaves uninitialized userland memory [stack]. Things
> like purify will bitch at it... I was wrong about the kernel leak.
It's not uninitialized. Initially, it was set to all-0 and may now
previous stack contents. I doubt purify would complain since it was not
able to control its creation. I see no reason to copy data to the user
stack that the user won't be looking at. It's just wasteful.
Matt Thomas email: email@example.com
3am Software Foundry www: http://3am-software.com/bio/matt/
Cupertino, CA disclaimer: I avow all knowledge of this