linux-kernel - Re: tasks getting stuck on mmap

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]

Date:	Tue, 17 Aug 2010 16:40:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	tony.luck@...el.com, walken@...gle.com, dhowells@...hat.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: tasks getting stuck on mmap_sem?

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Tue, 17 Aug 2010 14:28:49 -0700

> Oh, and it strikes me when looking at the sparc rwsem-const.h that it
> has some unsigned constants in it. I think
> 
>   #define RWSEM_WAITING_BIAS              0xffff0000
> 
> is actually unsigned, because it's a hex constant that doesn't fit in
> a signed int. So it's of type 'unsigned int' if I recall the C type
> rules right.

You were right all along, of course.  Nice spotting.

Something was messed up with my testing methodology last night such
that I didn't test the revert of the lib/rwsem.c changes properly.
Those actually did in fact introduce the problem.

And fixing these sparc rwsem values to be signed constants fixes the bug.

Thanks guys.
--
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/