* ldconfig is statically linked or dynamiclly linked
@ 2022-09-01 9:41 Lv Ying
2022-09-01 12:19 ` Florian Weimer
2022-09-01 12:22 ` Siddhesh Poyarekar
0 siblings, 2 replies; 4+ messages in thread
From: Lv Ying @ 2022-09-01 9:41 UTC (permalink / raw)
To: libc-help
Hi all:
I am confused when exec file ldconfig and ldd ldconfig on CentOS 8(glibc-2.28):
# which ldconfig
/usr/sbin/ldconfig
# file /usr/sbin/ldconfig
/usr/sbin/ldconfig: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, for GNU/Linux 3.2.0, BuildID[sha1]=90ddd9a3e194fb2ec4edd5184d9fca4df45af636, not stripped
# ldd /usr/sbin/ldconfig
statically linked
So ldconfig is dynamiclly linked or statically linked?
I lookup elf/Makefile:
ifeq (yes,$(use-ldconfig))
ifeq (yes,$(build-shared))
others-static += ldconfig
others += ldconfig
install-rootsbin += ldconfig
I think ldconfig may be statically linked, and can ldconfig be only statically linked?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ldconfig is statically linked or dynamiclly linked
2022-09-01 9:41 ldconfig is statically linked or dynamiclly linked Lv Ying
@ 2022-09-01 12:19 ` Florian Weimer
2022-09-01 12:22 ` Siddhesh Poyarekar
1 sibling, 0 replies; 4+ messages in thread
From: Florian Weimer @ 2022-09-01 12:19 UTC (permalink / raw)
To: Lv Ying via Libc-help; +Cc: Lv Ying
* Lv Ying via Libc-help:
> So ldconfig is dynamiclly linked or statically linked?
Usually, glibc ldconfig is statically linked. The output of the file
tool is notoriously unreliable.
> I think ldconfig may be statically linked, and can ldconfig be only
> statically linked?
It's technically possible to link it dynamically, with a few makefile
changes, but we don't do that, to make it easier to recover from certain
failure scenarios.
Thanks,
Florian
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ldconfig is statically linked or dynamiclly linked
2022-09-01 9:41 ldconfig is statically linked or dynamiclly linked Lv Ying
2022-09-01 12:19 ` Florian Weimer
@ 2022-09-01 12:22 ` Siddhesh Poyarekar
2022-09-01 13:15 ` Adhemerval Zanella Netto
1 sibling, 1 reply; 4+ messages in thread
From: Siddhesh Poyarekar @ 2022-09-01 12:22 UTC (permalink / raw)
To: Lv Ying; +Cc: libc-help
On Thu, Sep 1, 2022 at 5:42 AM Lv Ying via Libc-help
<libc-help@sourceware.org> wrote:
> I am confused when exec file ldconfig and ldd ldconfig on CentOS 8(glibc-2.28):
>
> # which ldconfig
> /usr/sbin/ldconfig
> # file /usr/sbin/ldconfig
> /usr/sbin/ldconfig: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, for GNU/Linux 3.2.0, BuildID[sha1]=90ddd9a3e194fb2ec4edd5184d9fca4df45af636, not stripped
ldconfig is a statically linked PIE executable. The file command
tends to claim that PIE executables are shared objects, which is what
you're seeing here.
Sid
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ldconfig is statically linked or dynamiclly linked
2022-09-01 12:22 ` Siddhesh Poyarekar
@ 2022-09-01 13:15 ` Adhemerval Zanella Netto
0 siblings, 0 replies; 4+ messages in thread
From: Adhemerval Zanella Netto @ 2022-09-01 13:15 UTC (permalink / raw)
To: Siddhesh Poyarekar, Lv Ying; +Cc: libc-help
On 01/09/22 09:22, Siddhesh Poyarekar via Libc-help wrote:
> On Thu, Sep 1, 2022 at 5:42 AM Lv Ying via Libc-help
> <libc-help@sourceware.org> wrote:
>> I am confused when exec file ldconfig and ldd ldconfig on CentOS 8(glibc-2.28):
>>
>> # which ldconfig
>> /usr/sbin/ldconfig
>> # file /usr/sbin/ldconfig
>> /usr/sbin/ldconfig: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, for GNU/Linux 3.2.0, BuildID[sha1]=90ddd9a3e194fb2ec4edd5184d9fca4df45af636, not stripped
>
> ldconfig is a statically linked PIE executable. The file command
> tends to claim that PIE executables are shared objects, which is what
> you're seeing here.
>
> Sid
I think the issue is the file command, using a more recent one it does show
that ldconfig is a static-pie:
$ file elf/ldconfig
elf/ldconfig: ELF 64-bit LSB pie executable, x86-64, version 1 (GNU/Linux),
static-pie linked, for GNU/Linux 3.2.0, with debug_info, not stripped
$ readelf -l elf/ldconfig | grep INTERP
$
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-09-01 9:41 ldconfig is statically linked or dynamiclly linked Lv Ying
2022-09-01 12:19 ` Florian Weimer
2022-09-01 12:22 ` Siddhesh Poyarekar
2022-09-01 13:15 ` Adhemerval Zanella Netto
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