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Date: Wed, 23 Mar 2022 15:30:44 -0700 From: Kees Cook <keescook@...omium.org> To: Matthew Wilcox <willy@...radead.org> Cc: Christoph Hellwig <hch@....de>, kernel test robot <oliver.sang@...el.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, Bart Van Assche <bvanassche@....org>, John Garry <john.garry@...wei.com>, LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org, lkp@...el.com, linux-mm@...ck.org, linux-hardening@...r.kernel.org Subject: Re: [scsi] 6aded12b10: kernel_BUG_at_mm/usercopy.c On Wed, Mar 23, 2022 at 03:42:34PM +0000, Matthew Wilcox wrote: > On Wed, Mar 23, 2022 at 08:40:30AM -0700, Kees Cook wrote: > > On Wed, Mar 23, 2022 at 08:14:10AM +0100, Christoph Hellwig wrote: > > > The actual warning is; > > > > > > [ 34.496096][ T331] usercopy: Kernel memory overwrite attempt detected to spans multiple pages (off set 0, size 6)! > > > > > > This is for the cmnd field in struct scsi_cmnd, which is allocated by > > > the block layer as part of the request allocator. So with a specific > > > packing it can legitimately span pages. > > > > > > Kees: how can we annotate that this is ok? > > > > The main problem is that CONFIG_HARDENED_USERCOPY_PAGESPAN=y is broken > > (and nothing should be setting it). > > > > This series removes it: > > https://lore.kernel.org/linux-hardening/20220110231530.665970-1-willy@infradead.org/ > > > > Matthew, what's the status of that series? Will it make the current > > merge window? > > I thought you were going to merge it! I haven't put it in any of my > public trees. LOL. Okay, you'd mentioned another check, so I wasn't sure. I can go ahead and snag it, but I'll likely wait until the next window and let it live in -next for a while, unless you think it should get YOLOed in. :) -Kees -- Kees Cook
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