Devuan logs - #497, boring messages

Message sent to [email protected], [email protected]:

Subject: bug#497: libc6: Permission denied, intermittent in execve
Reply-To: Alessandro Vesely <[email protected]>, [email protected]
Resent-From: Alessandro Vesely <[email protected]>
Resent-To: [email protected]
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Resent-Date: Mon, 27 Jul 2020 08:33:01 +0000
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From: Alessandro Vesely <[email protected]>
To: Devuan Bug Tracking System <[email protected]>
Message-ID: <[email protected]>
Date: Mon, 27 Jul 2020 10:25:27 +0200

Package: libc6
Version: GNU C Library (Debian GLIBC 2.28-10) stable release version 2.28.
Severity: normal

Dear Maintainer,

in certain situations, execve fails setting errno to EACCESS.  The same
program, launched by the same user in different ways, succeeds or fails
according to preceding actions.

None of the failure conditions for EACCESS is met.

The case at hand happens with an old version of Thunderbird and a LibreOffice
attachment.  After saving the attachment, Thunderbird execs gio-launch-desktop.
The latter tries to exec libreoffice6.4 and fails.

I strace'd the full arguments used in the failed execve(), and copied them to a
simple C program which runs just that execve() call.  When called from the
command line, the program succeeds.  Then I replaced the gio-launch-desktop
executable with my straw men.  When called from Thunderbird, the program fails.

See also:
https://unix.stackexchange.com/questions/600174/permission-denied-intermittent-
in-execve


-- System Information:
Distributor ID: Debian
Description:    Devuan GNU/Linux 3 (beowulf)
Release:        3
Codename:       beowulf
Architecture: x86_64

Kernel: Linux 4.19.0-9-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8),
LANGUAGE=en_IE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

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X-Loop: [email protected]
From: "Devuan bug Tracking System" <[email protected]>
To: Alessandro Vesely <[email protected]>
Subject: bug#497: Acknowledgement (libc6: Permission denied, intermittent
 in execve)
Message-ID: <[email protected]>
References: <[email protected]>
X-Devuan-PR-Message: ack 497
X-Devuan-PR-Package: libc6
Reply-To: [email protected]
Date: Mon, 27 Jul 2020 08:33:04 +0000

Thank you for filing a new bug report with Devuan.

You can follow progress on this bug here: 497: https://bugs.devuan.org/cgi/=
bugreport.cgi?bug=3D497.

This is an automatically generated reply to let you know your message
has been received.

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--=20
497: https://bugs.devuan.org/cgi/bugreport.cgi?bug=3D497
Devuan Bug Tracking System
Contact [email protected] with problems

Message sent to [email protected], [email protected]:

Subject: bug#497: Please discard 497, keep 498
Reply-To: Alessandro Vesely <[email protected]>, [email protected]
Resent-From: Alessandro Vesely <[email protected]>
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Resent-Date: Mon, 27 Jul 2020 09:03:02 +0000
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References: <[email protected]>
To: [email protected]
From: Alessandro Vesely <[email protected]>
Message-ID: <[email protected]>
Date: Mon, 27 Jul 2020 10:51:47 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
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I should've sent 498 as a reply to 497, sorry.

Yet 498 has the link unbroken...

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From: "Devuan bug Tracking System" <[email protected]>
To: Alessandro Vesely <[email protected]>
Subject: bug#497: Info received (Please discard 497, keep 498)
Message-ID: <[email protected]>
References: <[email protected]>
X-Devuan-PR-Message: ack-info 497
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Reply-To: [email protected]
Date: Mon, 27 Jul 2020 09:03:09 +0000

Thank you for the additional information you have supplied regarding
this bug report.

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):
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If you wish to submit further information on this problem, please
send it to [email protected].

Please do not send mail to [email protected] unless you wish
to report a problem with the Bug-tracking system.

--=20
497: https://bugs.devuan.org/cgi/bugreport.cgi?bug=3D497
Devuan Bug Tracking System
Contact [email protected] with problems

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From: Mark Hindley <[email protected]>
To: Alessandro Vesely <[email protected]>, [email protected]
Subject: Re: bug#498: libc6: Permission denied, intermittent in execve
Message-ID: <[email protected]>
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 <[email protected]>
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Control: forcemerge 498 497
Control: tags -1 debian
Control: forwarded -1 https://bugs.debian.org/966343

Alessandro

On Mon, Jul 27, 2020 at 10:32:15AM +0200, Alessandro Vesely wrote:
> Package: libc6
> Version: GNU C Library (Debian GLIBC 2.28-10) stable release version 2.28.
> Severity: normal
> 
> 
> -------- Forwarded Message --------
> Subject: libc6: Permission denied, intermittent in execve
> Date: Mon, 27 Jul 2020 10:25:27 +0200
> From: Alessandro Vesely <[email protected]>
> To: Devuan Bug Tracking System <[email protected]>
> 
> 
> Dear Maintainer,
> 
> in certain situations, execve fails setting errno to EACCESS.  The same
> program, launched by the same user in different ways, succeeds or fails
> according to preceding actions.

Thanks for this. As you have realised, libc6 is a Debian package that Devuan
uses directly without recompilation so this issue is correctly dealt with in
Debian's BTS.

However, one thought that occurs to me is whether apparmor is causing this? Does
disabling it[1] restore predictable behaviour?

Thanks.

Mark


[1]  https://wiki.debian.org/AppArmor/HowToUse#Diagnose_if_a_bug_might_have_been_caused_by_AppArmor

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To: Alessandro Vesely <[email protected]>, [email protected]
Subject: Re: bug#498: libc6: Permission denied, intermittent in execve
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 <[email protected]>
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Control: forcemerge 498 497
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Alessandro

On Mon, Jul 27, 2020 at 10:32:15AM +0200, Alessandro Vesely wrote:
> Package: libc6
> Version: GNU C Library (Debian GLIBC 2.28-10) stable release version 2.28.
> Severity: normal
> 
> 
> -------- Forwarded Message --------
> Subject: libc6: Permission denied, intermittent in execve
> Date: Mon, 27 Jul 2020 10:25:27 +0200
> From: Alessandro Vesely <[email protected]>
> To: Devuan Bug Tracking System <[email protected]>
> 
> 
> Dear Maintainer,
> 
> in certain situations, execve fails setting errno to EACCESS.  The same
> program, launched by the same user in different ways, succeeds or fails
> according to preceding actions.

Thanks for this. As you have realised, libc6 is a Debian package that Devuan
uses directly without recompilation so this issue is correctly dealt with in
Debian's BTS.

However, one thought that occurs to me is whether apparmor is causing this? Does
disabling it[1] restore predictable behaviour?

Thanks.

Mark


[1]  https://wiki.debian.org/AppArmor/HowToUse#Diagnose_if_a_bug_might_have_been_caused_by_AppArmor

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To: Alessandro Vesely <[email protected]>, [email protected]
Subject: Re: bug#498: libc6: Permission denied, intermittent in execve
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 <[email protected]>
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Control: forcemerge 498 497
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Alessandro

On Mon, Jul 27, 2020 at 10:32:15AM +0200, Alessandro Vesely wrote:
> Package: libc6
> Version: GNU C Library (Debian GLIBC 2.28-10) stable release version 2.28.
> Severity: normal
> 
> 
> -------- Forwarded Message --------
> Subject: libc6: Permission denied, intermittent in execve
> Date: Mon, 27 Jul 2020 10:25:27 +0200
> From: Alessandro Vesely <[email protected]>
> To: Devuan Bug Tracking System <[email protected]>
> 
> 
> Dear Maintainer,
> 
> in certain situations, execve fails setting errno to EACCESS.  The same
> program, launched by the same user in different ways, succeeds or fails
> according to preceding actions.

Thanks for this. As you have realised, libc6 is a Debian package that Devuan
uses directly without recompilation so this issue is correctly dealt with in
Debian's BTS.

However, one thought that occurs to me is whether apparmor is causing this? Does
disabling it[1] restore predictable behaviour?

Thanks.

Mark


[1]  https://wiki.debian.org/AppArmor/HowToUse#Diagnose_if_a_bug_might_have_been_caused_by_AppArmor

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Subject: Re: bug#498: libc6: Permission denied, intermittent in execve
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 <[email protected]>
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found 498 2.28-10