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Open Source and information security mailing list archives
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Date: Fri, 12 Jul 2013 22:38:22 +0400 From: Pavel Emelyanov <xemul@...allels.com> To: Andy Lutomirski <luto@...capital.net> CC: Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Glauber Costa <glommer@...allels.com>, KOSAKI Motohiro <kosaki.motohiro@...il.com>, Matt Mackall <mpm@...enic.com>, Marcelo Tosatti <mtosatti@...hat.com>, Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org> Subject: Re: [PATCH 4/5] mm: soft-dirty bits for user memory changes tracking On 07/11/2013 10:46 PM, Andy Lutomirski wrote: > > Sorry I'm late to the party -- I didn't notice this until the lwn > article this week. > > How does this get munmap + mmap right? mremap marks things soft-dirty, > but unmapping and remapping seems like it will result in the soft-dirty > bit being cleared. For that matter, won't this sequence also end up wrong: > > - clear_refs > - Write to mapping > - Page and pte evicted due to memory pressure > - Read from mapping -- clean page faulted back in > - pte soft-dirty is now clear ?!? Yes, it looks like this problem exists. I'll look what can be done about it, thank you. > --Andy Pavel -- 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/
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