NetBSD Problem Report #59741

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Date: Thu, 30 Oct 2025 21:27:34 +0000 (UTC)
From: campbell+netbsd@mumble.net
Reply-To: campbell+netbsd@mumble.net
To: gnats-bugs@NetBSD.org
Subject: possible issues in inet_cidr_ntop/pton, inet_net_ntop/pton
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>Number:         59741
>Category:       lib
>Synopsis:       possible issues in inet_cidr_ntop/pton, inet_net_ntop/pton
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 30 21:30:00 +0000 2025
>Last-Modified:  Thu Oct 30 23:35:00 +0000 2025
>Originator:     Taylor R Campbell
>Release:        
>Organization:
The InetBSD Orchards, Inc.
>Environment:
>Description:
We might have the same bugs as FreeBSD had -- FreeBSD patches and new tests here:

https://reviews.freebsd.org/D53488 (inet_cidr_*)
https://cgit.freebsd.org/src/commit/?id=8f4a0d2f7b96099001dbc51e06114df1a0e6d291 (inet_net_*)

(from ivy on libera.chat, haven't investigated any of this myself, not sure exactly what the bugs are, to fill in here when investigated)
>How-To-Repeat:
test cases in freebsd patch
>Fix:
freebsd patch

>Audit-Trail:
From: Lexi Winter <ivy@freebsd.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: lib/59741
Date: Thu, 30 Oct 2025 21:37:55 +0000

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 NB, after this change there is at least one remaining bug in inet_net_pton:
 for IPv4 the input "1.2.3.4/24" produces the output "1.2.3.4/24", while
 for IPv6 the input "2001:db8::1/64" produces the output "2001:db8::/64".

 i.e., for IPv6 it is stripping the host bits from the output, but for
 IPv4, it does not do this.  one of these behaviours is wrong, but i have
 not yet worked out which.

 a couple of trivial utilities which might be useful for testing this:

 * https://people.freebsd.org/~ivy/tmp/inet_pton.c
 * https://people.freebsd.org/~ivy/tmp/inet_pton6.c

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From: Lexi Winter <lexi@le-fay.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: lib/59741
Date: Thu, 30 Oct 2025 23:22:19 +0000

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 this change may fix the issue i mentioned in my previous mail:
 https://reviews.freebsd.org/D53491

 however, this hasn't been reviewed or landed in FreeBSD yet.

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