linux-kernel - RE: [PATCH v7 05/19] iov_iter: Introduce fault_in_iov_iter

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Message-ID: <ace2140100e6409a876984fafbb9cbde@intel.com>
Date:   Sat, 28 Aug 2021 02:20:05 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Luck, Tony" <tony.luck@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <djwong@...nel.org>, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        cluster-devel <cluster-devel@...hat.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>
Subject: RE: [PATCH v7 05/19] iov_iter: Introduce fault_in_iov_iter_writeable

> But if your kernel code loops and tries again without a return to user,
> then your get another #MC.

I've been trying to push this patch:

https://lore.kernel.org/linux-edac/20210818002942.1607544-1-tony.luck@intel.com/

which turns the infinite loops of machine checks into a panic.

-Tony