linux-kernel - Re: [PATCH] get_user_pages(..., write==1, ...) may return with readable pte.

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:	Sat, 14 Oct 2006 05:15:07 -0500
From:	Robin Holt <holt@....com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Robin Holt <holt@....com>, Hugh Dickins <hugh@...itas.com>,
	Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] get_user_pages(..., write==1, ...) may return with readable pte.

> dup_mmap holds mmap_sem for write. get_user_pages caller must hold it
> for read.

I could have sworn I checked for that and found a down_read(), but
now that I look when I have some time, it is clearly a down_write().
Sorry for the distraction.

It is a user job that is passing data between hosts.  The host is
under heavy memory pressure and one rank of the MPI job gets silent
data corruption.

Thanks and sorry for wasting your time,
Robin
-
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/