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Subject: bug#72012: [PATCH] id: Warn if user in more groups than `id` can reliably print
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While rare, it is possible for a user to be a member in more groups than
what the system limit allows (on Linux typically NGROUPS_MAX=65536) and
if that is the case, running `id` or `id user` will not print all of
them. This is a minor bug, but easily fixable by emitting a warning if
it happens.
---
src/id.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/id.c b/src/id.c
index 38d5517bd..c572b2d99 100644
--- a/src/id.c
+++ b/src/id.c
@@ -401,6 +401,13 @@ print_full_info (char const *username)
ok &= false;
return;
}
+ else if (sysconf(_SC_NGROUPS_MAX) > 0 && n_groups > sysconf(_SC_NGROUPS_MAX))
+ {
+ fprintf (stderr,
+ _("Warning: User '%s' may be member of more groups than "\
+ "the system allows\n"),
+ (username != NULL) ? username : "");
+ }
if (n_groups > 0)
fputs (_(" groups="), stdout);
--
2.25.1
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Otto =?UTF-8?Q?Kek=C3=A4l=C3=A4inen?= <otto@HIDDEN> Subject: bug#72012: Acknowledgement ([PATCH] id: Warn if user in more groups than `id` can reliably print) Message-ID: <handler.72012.B.17205366339316.ack <at> debbugs.gnu.org> References: <1720502706.260332.1588969.nullmailer@XPS-13-9370> X-Gnu-PR-Message: ack 72012 X-Gnu-PR-Package: coreutils X-Gnu-PR-Keywords: patch Reply-To: 72012 <at> debbugs.gnu.org Date: Tue, 09 Jul 2024 14:51:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-coreutils@HIDDEN If you wish to submit further information on this problem, please send it to 72012 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 72012: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D72012 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#72012: [PATCH] id: Warn if user in more groups than `id` can reliably print
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On 09/07/2024 05:22, Otto Kekäläinen wrote:
> While rare, it is possible for a user to be a member in more groups than
> what the system limit allows (on Linux typically NGROUPS_MAX=65536) and
> if that is the case, running `id` or `id user` will not print all of
> them. This is a minor bug, but easily fixable by emitting a warning if
> it happens.
> ---
> src/id.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/src/id.c b/src/id.c
> index 38d5517bd..c572b2d99 100644
> --- a/src/id.c
> +++ b/src/id.c
> @@ -401,6 +401,13 @@ print_full_info (char const *username)
> ok &= false;
> return;
> }
> + else if (sysconf(_SC_NGROUPS_MAX) > 0 && n_groups > sysconf(_SC_NGROUPS_MAX))
> + {
> + fprintf (stderr,
> + _("Warning: User '%s' may be member of more groups than "\
> + "the system allows\n"),
> + (username != NULL) ? username : "");
> + }
>
> if (n_groups > 0)
> fputs (_(" groups="), stdout);
I'm a bit confused with this patch.
If the n_groups is larger than NGROUPS_MAX what consequence will it have?
I.e. is there any point to id(1) warning about this edge case?
id will be able to show all of the n_groups in this case right?
I interpret NGROUPS_MAX as a static limit(ation),
which more dynamic interfaces (like getgrouplist) are not constrained to.
cheers,
Pádraig
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Subject: bug#72012: [PATCH] id: Warn if user in more groups than `id` can reliably print
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Hi!
The point is just to emit a warning when this happens. Sure it is rare but
the fix is pretty safe to apply.
--000000000000c8df07061cd6323c
Content-Type: text/html; charset="UTF-8"
<div dir="auto">Hi!<div dir="auto"><br></div><div dir="auto">The point is just to emit a warning when this happens. Sure it is rare but the fix is pretty safe to apply.</div></div>
--000000000000c8df07061cd6323c--
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On 09/07/2024 21:15, Otto Kekäläinen wrote:
> Hi!
>
> The point is just to emit a warning when this happens. Sure it is rare but the fix is pretty safe to apply.
OK so id(1) will always show all groups it knows about.
Then the warning message might be along the lines of:
"warning: User '%s' is a member of more groups than the current system limit"
For reference I see a summary of limits of various systems at:
https://www.j3e.de/ngroups.html
cheers,
Pádraig
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On 7/10/24 00:35, P=C3=A1draig Brady wrote:
> OK so id(1) will always show all groups it knows about.
> Then the warning message might be along the lines of:
>=20
> =C2=A0 "warning: User '%s' is a member of more groups than the current=
=20
> system limit"
I also am not seeing the point of the proposed diagnostic. I daresay=20
most users would be more annoyed than usefully warned by the diagnostic;=20
I know I would.
The rare user concerned about being in "too many" groups can run=20
'getconf NGROUPS_MAX' and 'id -G | wc -w' and compare.
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tag 72012 notabug
close 72012
stop
On 10/07/2024 00:31, Paul Eggert wrote:
> On 7/10/24 00:35, Pádraig Brady wrote:
>> OK so id(1) will always show all groups it knows about.
>> Then the warning message might be along the lines of:
>>
>> "warning: User '%s' is a member of more groups than the current
>> system limit"
>
> I also am not seeing the point of the proposed diagnostic. I daresay
> most users would be more annoyed than usefully warned by the diagnostic;
> I know I would.
>
> The rare user concerned about being in "too many" groups can run
> 'getconf NGROUPS_MAX' and 'id -G | wc -w' and compare.
Right.
Given that id can display all the groups,
it's not its responsibility to display potential limits from elsewhere.
cheers,
Pádraig
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[86.44.211.146]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-367cdfa0694sm4639177f8f.66.2024.07.10.01.17.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Jul 2024 01:17:19 -0700 (PDT) Message-ID: <73924406-76ee-4e80-9ae7-d87d10683896@HIDDEN> Date: Wed, 10 Jul 2024 09:17:18 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: bug#72012: [PATCH] id: Warn if user in more groups than `id` can reliably print To: Paul Eggert <eggert@HIDDEN>, 72012 <at> debbugs.gnu.org References: <1720502706.260332.1588969.nullmailer@XPS-13-9370> <ce3d7acc-b390-4008-8e3f-db96e8e3113f@HIDDEN> <CAOU6tAASsbSSb6mH=sDhod2G1MGU3pmrKouS3ZMSoUORST+G5A@HIDDEN> <722eef73-3602-4a38-8a67-0f086b98fc84@HIDDEN> <237c7d15-fc35-48da-b47e-a5a6c15c2b1e@HIDDEN> Content-Language: en-US From: =?UTF-8?Q?P=C3=A1draig_Brady?= <P@HIDDEN> In-Reply-To: <237c7d15-fc35-48da-b47e-a5a6c15c2b1e@HIDDEN> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Score: 0.2 (/) X-Debbugs-Envelope-To: control Cc: =?UTF-8?B?T3R0byBLZWvDpGzDpGluZW4=?= <otto@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.8 (/) tag 72012 notabug close 72012 stop On 10/07/2024 00:31, Paul Eggert wrote: > On 7/10/24 00:35, Pádraig Brady wrote: >> OK so id(1) will always show all groups it knows about. >> Then the warning message might be along the lines of: >> >> "warning: User '%s' is a member of more groups than the current >> system limit" > > I also am not seeing the point of the proposed diagnostic. I daresay > most users would be more annoyed than usefully warned by the diagnostic; > I know I would. > > The rare user concerned about being in "too many" groups can run > 'getconf NGROUPS_MAX' and 'id -G | wc -w' and compare. Right. Given that id can display all the groups, it's not its responsibility to display potential limits from elsewhere. cheers, Pádraig
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[86.44.211.146]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-367cdfa0694sm4639177f8f.66.2024.07.10.01.17.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Jul 2024 01:17:19 -0700 (PDT) Message-ID: <73924406-76ee-4e80-9ae7-d87d10683896@HIDDEN> Date: Wed, 10 Jul 2024 09:17:18 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: bug#72012: [PATCH] id: Warn if user in more groups than `id` can reliably print To: Paul Eggert <eggert@HIDDEN>, 72012 <at> debbugs.gnu.org References: <1720502706.260332.1588969.nullmailer@XPS-13-9370> <ce3d7acc-b390-4008-8e3f-db96e8e3113f@HIDDEN> <CAOU6tAASsbSSb6mH=sDhod2G1MGU3pmrKouS3ZMSoUORST+G5A@HIDDEN> <722eef73-3602-4a38-8a67-0f086b98fc84@HIDDEN> <237c7d15-fc35-48da-b47e-a5a6c15c2b1e@HIDDEN> Content-Language: en-US From: =?UTF-8?Q?P=C3=A1draig_Brady?= <P@HIDDEN> In-Reply-To: <237c7d15-fc35-48da-b47e-a5a6c15c2b1e@HIDDEN> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Score: 0.2 (/) X-Debbugs-Envelope-To: control Cc: =?UTF-8?B?T3R0byBLZWvDpGzDpGluZW4=?= <otto@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.8 (/) tag 72012 notabug close 72012 stop On 10/07/2024 00:31, Paul Eggert wrote: > On 7/10/24 00:35, Pádraig Brady wrote: >> OK so id(1) will always show all groups it knows about. >> Then the warning message might be along the lines of: >> >> "warning: User '%s' is a member of more groups than the current >> system limit" > > I also am not seeing the point of the proposed diagnostic. I daresay > most users would be more annoyed than usefully warned by the diagnostic; > I know I would. > > The rare user concerned about being in "too many" groups can run > 'getconf NGROUPS_MAX' and 'id -G | wc -w' and compare. Right. Given that id can display all the groups, it's not its responsibility to display potential limits from elsewhere. cheers, Pádraig
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