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Subject: bug#15232: cp -i a/s b/s c
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$ cp -i a/s b/s c
cp: overwrite =E2=80=98c/s=E2=80=99? y
cp: will not overwrite just-created =E2=80=98c/s=E2=80=99 with =E2=80=98b=
/s=E2=80=99
Mmmm OK, but maybe don't ask then.

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Subject: bug#15232: Acknowledgement (cp -i a/s b/s c)
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Subject: bug#15232: cp -i a/s b/s c
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 Content preview:  On 09/01/2013 08:37 AM, jidanni@HIDDEN wrote: > $ cp
   -i a/s b/s c > cp: overwrite =?UTF-8?Q?=E2=80=98c/s=E2=80=99=3F?= y > cp: will not overwrite just-created
    =?UTF-8?Q?=E2=80=98c/s=E2=80=99?= with =?UTF-8?Q?=E2=80=98b/s=E2=80=99?= > Mmmm OK, but maybe don't ask then. [...] 
 
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 Content preview:  On 09/01/2013 08:37 AM, jidanni@HIDDEN wrote: > $ cp
   -i a/s b/s c > cp: overwrite =?UTF-8?Q?=E2=80=98c/s=E2=80=99=3F?= y > cp: will not overwrite just-created
    =?UTF-8?Q?=E2=80=98c/s=E2=80=99?= with =?UTF-8?Q?=E2=80=98b/s=E2=80=99?= > Mmmm OK, but maybe don't ask then. [...] 
 
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On 09/01/2013 08:37 AM, jidanni@HIDDEN wrote:
> $ cp -i a/s b/s c
> cp: overwrite ‘c/s’? y
> cp: will not overwrite just-created ‘c/s’ with ‘b/s’
> Mmmm OK, but maybe don't ask then.

This is a fair point.
There are two ways to handle this.
1. Do allow the overwrite if 'y' answered.
2. Don't prompt and just display the error.

Case 1 could be useful if you wanted to give
priority to the last item copied in.
However there would be an ambiguity in that case,
as you wouldn't know if the prompt was for an
existing file or a newly copied file.
Also that use case is handled with -n anyway,
by just ordering the parameters according to priority.
So option 2 as you suggest seems like the right thing to do.

So this is a generally means we might only prompt
_after_ we discount all cases that aren't allowed.
Another for example is:

$ rm -f c/s && mkdir c/s && cp -i a/s b/s c
cp: overwrite `c/s'? y
cp: cannot overwrite directory `c/s' with non-directory
cp: overwrite `c/s'? y
cp: cannot overwrite directory `c/s' with non-directory

But then on the other hand, if you did answer 'n' above,
the exit code from cp would be 'success' rather than 'failure'.
I.E. it would be a change in behavior to adjust this,
rather than just a prompt avoidance.
I.E. it's only a redundant prompt when you answer 'y'.

So I'm inclined to leave this as is?

thanks,
Pádraig.

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Subject: bug#15232: cp -i a/s b/s c
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 Content preview:  All I know is that if it is smart enough to say >> cp: will
    not overwrite just-created =?UTF-8?Q?=E2=80=98c/s=E2=80=99?= with =?UTF-8?Q?=E2=80=98b/s=E2=80=99?= which is indeed rather
    smart, then it should be smart enough to gather all its thoughts together
    before presenting them to the user. Hmmm, then it should be also smart enough
    to recognize the collision and stop before any of it happens... [...] 
 
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 Content preview:  All I know is that if it is smart enough to say >> cp: will
    not overwrite just-created =?UTF-8?Q?=E2=80=98c/s=E2=80=99?= with =?UTF-8?Q?=E2=80=98b/s=E2=80=99?= which is indeed rather
    smart, then it should be smart enough to gather all its thoughts together
    before presenting them to the user. Hmmm, then it should be also smart enough
    to recognize the collision and stop before any of it happens... [...] 
 
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All I know is that if it is smart enough to say
>> cp: will not overwrite just-created =E2=80=98c/s=E2=80=99 with =E2=80=98=
b/s=E2=80=99
which is indeed rather smart, then it should be smart enough to
gather all its thoughts together before presenting them to the user.
Hmmm, then it should be also smart enough to recognize the collision and
stop before any of it happens...

By which time the algorithm to prevent user error becomes so big as to
introduce different errors... so maybe
PB> So I'm inclined to leave this as is?
is the right thing. The only problem is five years later certain "j"
users will rediscover it and write back again expecting a free t-shirt
etc. :-)

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> >> cp: will not overwrite just-created ‘c/s’ with ‘b/s’

Personally I have never liked that behavior.  It is trying to be too
smart.  If I had my "druthers" I would rather see that behavior
removed.  If I ask for the file to be overwritten twice then I expect
the file to be overwritten twice.

Problems like those are one of the reasons I would use a for loop to
avoid the too smart cp code.

  for f in one two three; do cp $f targetdir/; done

But then I would never use cp -i either.

jidanni@HIDDEN wrote:
> All I know is that if it is smart enough to say
> >> cp: will not overwrite just-created ‘c/s’ with ‘b/s’
> which is indeed rather smart, then it should be smart enough to
> gather all its thoughts together before presenting them to the user.
> Hmmm, then it should be also smart enough to recognize the collision and
> stop before any of it happens...

Creeping featurism and bloat.  It should be removed and simplified
rather than embraced and expanded.

> By which time the algorithm to prevent user error becomes so big as to
> introduce different errors... so maybe
> PB> So I'm inclined to leave this as is?
> is the right thing. The only problem is five years later certain "j"
> users will rediscover it and write back again expecting a free t-shirt
> etc. :-)

Have you ever gotten a free t-shirt? :-)

Bob

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On Wed, Sep 18, 2013 at 11:19 AM, Bob Proulx <bob@HIDDEN> wrote:
>> >> cp: will not overwrite just-created =91c/s=92 with =91b/s=92
>
> Personally I have never liked that behavior.  It is trying to be too
> smart.  If I had my "druthers" I would rather see that behavior
> removed.  If I ask for the file to be overwritten twice then I expect
> the file to be overwritten twice.
...
> Creeping featurism and bloat.  It should be removed and simplified
> rather than embraced and expanded.

Hi Bob,
If you don't like the "feature", perhaps I haven't made it clear
enough that without it, cp is vulnerable to a subtle type of exploit.
The trouble arises when there are two files by the same name
(obviously in two separate directories, as in the example), but where
the first one that cp copies is a symlink, and the second one contains
the "payload", which would (without this feature) be copied through
the just-copied symlink.  With that, if some victim (person or script)
can be made to issue such a command, the one who controls the contents
of the source directories can chose the name of a file writable by the
victim as well as the desired contents: cp would do the rest. Sure, it
requires a buggy script, or a cooperative/susceptible victim, but how
many of us would guess that a root-run "cp -p dir.* dest-dir" could be
tricked into doing something bad?

I was sooo glad I spotted that bug before this exploitable cp made it
into a release.

It affected other vendors back then, and probably some even now.

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 Content preview:  >>>>> "JM" == Jim Meyering <jim@HIDDEN> writes: JM>
 enough that without it, cp is vulnerable to a subtle type of exploit. Well
 some word about this should be in some footnote in the cp INFO manual. [...]
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 Content preview:  >>>>> "JM" == Jim Meyering <jim@HIDDEN> writes: JM>
   enough that without it, cp is vulnerable to a subtle type of exploit. Well
    some word about this should be in some footnote in the cp INFO manual. [...]
    
 
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>>>>> "JM" == Jim Meyering <jim@HIDDEN> writes:

JM> enough that without it, cp is vulnerable to a subtle type of exploit.

Well some word about this should be in some footnote in the cp INFO manual.

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 Content preview:  On 09/19/2013 11:02 PM, jidanni@HIDDEN wrote: >> Jim
 Meyering <jim@HIDDEN> writes: > >> enough that without it,
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 Content preview:  On 09/19/2013 11:02 PM, jidanni@HIDDEN wrote: >> Jim
   Meyering <jim@HIDDEN> writes: > >> enough that without it, cp is vulnerable
    to a subtle type of exploit. > > Well some word about this should be in some
    footnote in the cp INFO manual. [...] 
 
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On 09/19/2013 11:02 PM, jidanni@HIDDEN wrote:
>> Jim Meyering <jim@HIDDEN> writes:
> 
>> enough that without it, cp is vulnerable to a subtle type of exploit.
> 
> Well some word about this should be in some footnote in the cp INFO manual.

It would be vulnerable "without it", as Jim wrote.
So I don't think the man or info pages are the right place.
We even have a test case for that:
http://git.sv.gnu.org/cgit/coreutils.git/tree/tests/cp/abuse.sh

BTW: I'm not sure if we're talking about two different things now:
The OP was talking about ordinary files a/s and b/s which leads to

  cp: will not overwrite just-created 'c/s' with 'b/s'

whereas Jim is talking about a/s being a symlink which leads to

  cp: will not copy 'b/s' through just-created symlink 'c/s'

Have a nice day,
Berny

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 Content preview:  >>>>> "BV" == Bernhard Voelker <mail@HIDDEN>
   writes: BV> So I don't think the man or info pages are the right place. Huh?
    Hush hush for security, or just not to bog the pages down? BV> BTW: I'm not
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>>>>> "BV" == Bernhard Voelker <mail@HIDDEN> writes:
BV> So I don't think the man or info pages are the right place.
Huh? Hush hush for security, or just not to bog the pages down?
BV> BTW: I'm not sure if we're talking about two different things now:
(All one big blur to me anyway.)

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    wrote: =?UTF-8?Q?>>=C2?= "BV"=?UTF-8?Q?=C2_?= =?UTF-8?Q?=3D=3D=C2_?= =?UTF-8?Q?Bernhard=C2_?= =?UTF-8?Q?Voelker=C2_?= =?UTF-8?Q?<mail@HIDDEN>=C2?= writes:
    =?UTF-8?Q?>>=C2_?= =?UTF-8?Q?So=C2_?= =?UTF-8?Q?I=C2_?= =?UTF-8?Q?don't=C2_?= =?UTF-8?Q?think=C2_?= =?UTF-8?Q?the=C2_?= =?UTF-8?Q?man=C2_?= =?UTF-8?Q?or=C2_?= =?UTF-8?Q?info=C2_?= =?UTF-8?Q?pages=C2_?= =?UTF-8?Q?are=C2_?= =?UTF-8?Q?the=C2_?= =?UTF-8?Q?right=C2?= place.
    > =?UTF-8?Q?>=C2_?= =?UTF-8?Q?Huh=3F=C2_?= =?UTF-8?Q?Hush=C2_?= =?UTF-8?Q?hush=C2_?= =?UTF-8?Q?for=C2_?= =?UTF-8?Q?security,=C2_?= =?UTF-8?Q?or=C2_?= =?UTF-8?Q?just=C2_?= =?UTF-8?Q?not=C2_?= =?UTF-8?Q?to=C2_?= =?UTF-8?Q?bog=C2_?= =?UTF-8?Q?the=C2_?= =?UTF-8?Q?pages=C2?=
    down? [...] 
 
 Content analysis details:   (1.3 points, 10.0 required)
 
  pts rule name              description
 ---- ---------------------- --------------------------------------------------
 -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at http://www.dnswl.org/, no
                             trust
                             [212.227.17.10 listed in list.dnswl.org]
 -0.0 SPF_HELO_PASS          SPF: HELO matches SPF record
  1.3 GAPPY_SUBJECT          Subject: contains G.a.p.p.y-T.e.x.t
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
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 Content preview:  =?UTF-8?Q?>=C2_?= =?UTF-8?Q?On=C2_?= =?UTF-8?Q?September=C2_?= =?UTF-8?Q?20,=C2_?= =?UTF-8?Q?2013=C2_?= =?UTF-8?Q?at=C2_?= =?UTF-8?Q?10:38=C2_?= =?UTF-8?Q?AM=C2_?= =?UTF-8?Q?jidanni@HIDDEN=C2?=
    wrote: =?UTF-8?Q?>>=C2?= "BV"=?UTF-8?Q?=C2_?= =?UTF-8?Q?=3D=3D=C2_?= =?UTF-8?Q?Bernhard=C2_?= =?UTF-8?Q?Voelker=C2_?= =?UTF-8?Q?<mail@HIDDEN>=C2?= writes:
    =?UTF-8?Q?>>=C2_?= =?UTF-8?Q?So=C2_?= =?UTF-8?Q?I=C2_?= =?UTF-8?Q?don't=C2_?= =?UTF-8?Q?think=C2_?= =?UTF-8?Q?the=C2_?= =?UTF-8?Q?man=C2_?= =?UTF-8?Q?or=C2_?= =?UTF-8?Q?info=C2_?= =?UTF-8?Q?pages=C2_?= =?UTF-8?Q?are=C2_?= =?UTF-8?Q?the=C2_?= =?UTF-8?Q?right=C2?= place.
    > =?UTF-8?Q?>=C2_?= =?UTF-8?Q?Huh=3F=C2_?= =?UTF-8?Q?Hush=C2_?= =?UTF-8?Q?hush=C2_?= =?UTF-8?Q?for=C2_?= =?UTF-8?Q?security,=C2_?= =?UTF-8?Q?or=C2_?= =?UTF-8?Q?just=C2_?= =?UTF-8?Q?not=C2_?= =?UTF-8?Q?to=C2_?= =?UTF-8?Q?bog=C2_?= =?UTF-8?Q?the=C2_?= =?UTF-8?Q?pages=C2?=
    down? [...] 
 
 Content analysis details:   (1.3 points, 10.0 required)
 
  pts rule name              description
 ---- ---------------------- --------------------------------------------------
 -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at http://www.dnswl.org/, no
                             trust
                             [212.227.17.10 listed in list.dnswl.org]
 -0.0 SPF_HELO_PASS          SPF: HELO matches SPF record
  1.3 GAPPY_SUBJECT          Subject: contains G.a.p.p.y-T.e.x.t

>=C2=A0On=C2=A0September=C2=A020,=C2=A02013=C2=A0at=C2=A010:38=C2=A0AM=C2=
=A0jidanni@HIDDEN=C2=A0wrote:
>>=C2=A0"BV"=C2=A0=3D=3D=C2=A0Bernhard=C2=A0Voelker=C2=A0<mail@bernhard-voe=
lker.de>=C2=A0writes:
>>=C2=A0So=C2=A0I=C2=A0don't=C2=A0think=C2=A0the=C2=A0man=C2=A0or=C2=A0info=
=C2=A0pages=C2=A0are=C2=A0the=C2=A0right=C2=A0place.
>
>=C2=A0Huh?=C2=A0Hush=C2=A0hush=C2=A0for=C2=A0security,=C2=A0or=C2=A0just=
=C2=A0not=C2=A0to=C2=A0bog=C2=A0the=C2=A0pages=C2=A0down?

No, there is no (known) security problem.=C2=A0 Please read Jim's message
again: there *would be* a security issue if the additional check was
removed.

Have a nice day,
Berny

Message sent to bug-coreutils@HIDDEN:

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>>>>> "BV" =3D=3D Bernhard Voelker <mail@HIDDEN> writes:
BV> No, there is no (known) security problem.=C2=A0 Please read Jim's mes=
sage

OK then the ought to add a footnote to the docs.

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severity 15232 wishlist
tags 15232 confirmed
retitle 15232 cp: "-i a/s b/s c" ask for confirmation then still fails

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From: Assaf Gordon <assafgordon@HIDDEN>
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 Content preview:  severity 15232 wishlist tags 15232 confirmed retitle 15232
 cp: "-i a/s b/s c" ask for confirmation then still fails [...] 
 Content analysis details:   (2.0 points, 10.0 required)
 pts rule name              description
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 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider
 (assafgordon[at]gmail.com)
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 -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at http://www.dnswl.org/, no
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severity 15232 wishlist
tags 15232 confirmed
retitle 15232 cp: "-i a/s b/s c" ask for confirmation then still fails

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To: control <at> debbugs.gnu.org
From: Assaf Gordon <assafgordon@HIDDEN>
Message-ID: <6022fcc9-ce5a-2e11-5155-c058ed996774@HIDDEN>
Date: Sun, 21 Oct 2018 14:42:19 -0600
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 Content preview:  severity 15232 wishlist tags 15232 confirmed retitle 15232
 cp: "-i a/s b/s c" ask for confirmation then still fails [...] 
 Content analysis details:   (2.0 points, 10.0 required)
 pts rule name              description
 ---- ---------------------- --------------------------------------------------
 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider
 (assafgordon[at]gmail.com)
 -0.0 SPF_PASS               SPF: sender matches SPF record
 -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at http://www.dnswl.org/, no
 trust [209.85.214.172 listed in list.dnswl.org]
 1.8 MISSING_SUBJECT        Missing Subject: header
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severity 15232 wishlist
tags 15232 confirmed
retitle 15232 cp: "-i a/s b/s c" ask for confirmation then still fails

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.