Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, bisected, reproducable) | KernelTrap

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, bisected, reproducable)

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From: Al Viro <viro@...>

To: Linus Torvalds <torvalds@...>

Cc: Andi Kleen <andi@...>, Bron Gondwana <brong@...>, Linux Kernel Mailing List <linux-kernel@...>, Nick Piggin <npiggin@...>, Andrew Morton <akpm@...>, Rob Mueller <robm@...>, Ingo Molnar <mingo@...>

Subject: Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, bisected, reproducable)

Date: Tuesday, June 17, 2008 - 5:36 pm

On Tue, Jun 17, 2008 at 02:24:39PM -0700, Linus Torvalds wrote:

quoted text> The whole *and*only* reason for copy_to/from_user() existing AT ALL is 
> exactly the fact that the source or destination access can fault. 

Erm...  The reason for copy_to_user() existing is that dereferencing
a user-supplied address in the kernel does not have to access any
memory reachable in user mode, regardless of any faults.  WTF are you
guys talking about?
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Messages in current thread:

BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, b..., Bron Gondwana, (Tue Jun 17, 2:00 am)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 2:02 am)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 1:08 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 10:21 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 1:45 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 4:16 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 4:58 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:14 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:26 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:31 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:34 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:46 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Nick Piggin, (Wed Jun 18, 2:10 am)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:34 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 4:41 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:15 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:06 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:20 pm)

BUG: mmapfile/writev spurious zero bytes still in the wild, Bron Gondwana, (Fri Oct 3, 7:44 am)

Re: BUG: mmapfile/writev spurious zero bytes still in the wild, Andrew Morton, (Fri Oct 3, 9:07 am)

Re: BUG: mmapfile/writev spurious zero bytes still in the wild, Bron Gondwana, (Fri Oct 3, 8:13 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 11:14 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Wed Jun 18, 12:03 am)

Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/writev..., Bron Gondwana, (Wed Jun 18, 1:11 am)

Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/wr..., Linus Torvalds, (Wed Jun 18, 12:22 pm)

Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/wr..., Robert Mueller, (Wed Jun 18, 7:45 pm)

Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/wr..., Linus Torvalds, (Wed Jun 18, 8:20 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 10:27 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:16 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:24 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Al Viro, (Tue Jun 17, 5:36 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:42 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Al Viro, (Tue Jun 17, 6:11 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 6:21 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386,, Nick Piggin, (Wed Jun 18, 2:22 am)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:49 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:30 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:37 pm)

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