[Buildroot] [Bug 7364] New: monit doesn't start with glibc 2.19 because geteuid() fails

[Buildroot] [Bug 7364] New: monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

           Summary: monit doesn't start with glibc 2.19 because geteuid()
                    fails
           Product: buildroot
           Version: 2014.08
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: syntheticpp at gmx.net
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


monit exits in src/env.c:

  struct passwd *pw;

  /* Get password struct */
  if ( ! (pw= getpwuid(geteuid())) ) {
    LogError("%s: You don't exist. Go away.\n", prog);
    exit(1);
  }

Only happens with glibc and eglibc 2.19 (tested with GCC 4.9.1), 2.18 is fine.

GCC warns while linking:
y.tab.c:(.text+0x379c): warning: Using 'getpwuid' in statically linked
applications requires at runtime the shared libraries from the glibc version
used for linking

Somehow libnss related?

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #1 from syntheticpp at gmx.net 2014-09-03 18:02:48 UTC ---
Logging in via ssh is delayed, looks like it runs into a timeout.
(strace shows that a select() on the client IP is paused)

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yann.morin.1998 at free.fr

--- Comment #2 from Yann E. MORIN <yann.morin.1998@free.fr> 2014-09-03 18:57:16 UTC ---
Normally, static linking with glibc is not possible, just because of
this issue: all that has to deal with names (usernames, groups,
hostnames...) need dynamic linking, becasue glibc uses libnss, which
dlopen()s the backend libraries, such as libnss_files.so.

How did you manage to have a statically-linked monit when using a
glibc toolchain? Care to share your .config, please?

Regards,
Yann E. MORIN.

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #3 from syntheticpp at gmx.net 2014-09-04 12:22:51 UTC ---
> 
> How did you manage to have a statically-linked monit when using a
> glibc toolchain? Care to share your .config, please?
> 

It's the configuration of 2014.08 no changes by me.

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #4 from syntheticpp at gmx.net 2014-09-04 12:27:59 UTC ---
> 
> GCC warns while linking:
> y.tab.c:(.text+0x379c): warning: Using 'getpwuid' in statically linked
> applications requires at runtime the shared libraries from the glibc version
> used for linking

This warning also shows up in the build which works (eglibc 2.18)

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #5 from Yann E. MORIN <yann.morin.1998@free.fr> 2014-09-04 15:52:07 UTC ---
> It's the configuration of 2014.08 no changes by me.

Sorry, this does not make sense:
  - there is no default configuration in Buildroot;
  - the default C library is uClibc, not glibc/eglibc.

So, yes, you did some configuration.
Please provide your .config file.

Regards,
Yann E. MORIN.

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #6 from syntheticpp at gmx.net 2014-09-05 08:43:42 UTC ---
Created attachment 5588
  --> https://bugs.busybox.net/attachment.cgi?id=5588
defconfig

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #7 from syntheticpp at gmx.net 2014-09-05 08:44:35 UTC ---
Created attachment 5594
  --> https://bugs.busybox.net/attachment.cgi?id=5594
generated .config

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[Buildroot] [Bug 7364] monit doesn't start with glibc 2.19 because geteuid() fails

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #8 from Yann E. MORIN <yann.morin.1998@free.fr> 2014-09-05 10:26:22 UTC ---
Indeed, the build warns about the use os the NSS functions in statically linked
applications.

However, this is only a warning, and not a build failure.

monit should not build a static application to start with. Changing the subject
to reflect the real issue.

Regards,
Yann E. MORIN.

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[Buildroot] [Bug 7364] monit builds a static application, even though BR2_PREFER_STATIC_LIB is not set, and with glibc.

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|monit doesn't start with    |monit builds a static
                   |glibc 2.19 because          |application, even though
                   |geteuid() fails             |BR2_PREFER_STATIC_LIB is
                   |                            |not set, and with glibc.

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[Buildroot] [Bug 7364] monit builds a static application, even though BR2_PREFER_STATIC_LIB is not set, and with glibc.

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #9 from Yann E. MORIN <yann.morin.1998@free.fr> 2014-09-05 10:30:26 UTC ---
When the C library is glibc/eglibc, we copy those files to the target:
    LIB_EXTERNAL_LIBS+=libnss_files.so.* libnss_dns.so.*

Can you confirm those files are present in your target?

Regarding the delay to login: what is your authentication method? Maybe there
are a few other libnss files tht should be copied over...

Regards,
Yann E. MORIN.

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[Buildroot] [Bug 7364] monit builds a static application, even though BR2_PREFER_STATIC_LIB is not set, and with glibc.

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #10 from Yann E. MORIN <yann.morin.1998@free.fr> 2014-09-05 11:18:45 UTC ---
I have a patch I'm currently testing...

Regards,
Yann E. MORIN.

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[Buildroot] [Bug 7364] monit builds a static application, even though BR2_PREFER_STATIC_LIB is not set, and with glibc.

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

--- Comment #11 from syntheticpp at gmx.net 2014-09-05 12:38:10 UTC ---
(In reply to comment #9)
> When the C library is glibc/eglibc, we copy those files to the target:
>     LIB_EXTERNAL_LIBS+=libnss_files.so.* libnss_dns.so.*
> 
> Can you confirm those files are present in your target?

Yes, they are.

> 
> Regarding the delay to login: what is your authentication method? Maybe there
> are a few other libnss files tht should be copied over...

In meantime I saw it also with the other build, so not related to this bug
here.

> 
> Regards,
> Yann E. MORIN.

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[Buildroot] [Bug 7364] monit builds a static application, even though BR2_PREFER_STATIC_LIB is not set, and with glibc.

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7364

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #12 from Yann E. MORIN <yann.morin.1998@free.fr> 2014-09-06 21:48:40 UTC ---
Hello!

We believe this isuue has now been fixed with this changeset:
   
http://git.buildroot.org/buildroot/commit/?id=03f388619a4dfa2835774702a54504b56e2e00e0

I'm closing the issue now. If you believe this does not fix your
problem, be sure to re-open this issue for further investigations.

Thank you for the report! :-)

Regards,
Yann E. MORIN.

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