BUG: $ORIGIN does not seem to work

BUG: $ORIGIN does not seem to work

[Stefan Fröberg]

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Hello

On glibc the following:

gcc  -o x -Wl,-rpath='$ORIGIN/lib' x.c -L ./lib -lcrypto

or

gcc  -o x -Wl,-rpath,'$ORIGIN/lib' x.c -L ./lib -lcrypto

Gives me binary with relative library path

ldd x
    linux-vdso.so.1 (0x00007ffcb6bee000)
*    libcrypto.so.1.0.0 => /home/wizard/kal-el/lib/libcrypto.so.1.0.0
(0x00007f0bc3593000)**
*    libc.so.6 => /lib64/libc.so.6 (0x00007f0bc31e2000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007f0bc2fde000)
    libz.so.1 => /lib64/libz.so.1 (0x00007f0bc2dc7000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f0bc39d2000)

cp -rap kal-el/* batman/
ldd x
    linux-vdso.so.1 (0x00007ffdbf0b6000)
*    libcrypto.so.1.0.0 => /home/wizard/batman/lib/libcrypto.so.1.0.0
(0x00007fb682149000)**
*    libc.so.6 => /lib64/libc.so.6 (0x00007fb681d98000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007fb681b94000)
    libz.so.1 => /lib64/libz.so.1 (0x00007fb68197d000)
    /lib64/ld-linux-x86-64.so.2 (0x00007fb682588000)


But trying the same with musl does not seem to work?
ldd x
/lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
    libc.so => /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)

and if i remove the -L ./lib from the command it uses system library
gcc  -o x -Wl,-rpath,'$ORIGIN/lib'  x.c   -lcrypto
ldd xx
    /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
    libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7fdd85ed7000)
    libc.so => /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)


GCC version 7.2 and musl 1.1.18

GCC configured with the following:
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-musl/7.2.0/lto-wrapper
Target: x86_64-linux-musl
Configured with: ../configure --prefix=/usr --build=x86_64-linux-musl
--enable-languages=c,c++,lto --disable-multilib --disable-nls
--disable-libmudflap --disable-libsanitizer --with-system-zlib
--disable-werror --enable-gold=yes --enable-ld=yes --enable-plugin
--enable-plugins --enable-lto --enable-default-pie --enable-default-ssp
--with-linker-hash-style=gnu --enable-libgomp --with-fpmath=sse
Thread model: posix
gcc version 7.2.0 (GCC)


Best regards
Stefan Fröberg

x.c
------------------------------
#include <stdio.h>
#include <openssl/ssl.h>

int main(void)
{
   
OPENSSL_init_crypto(OPENSSL_INIT_NO_ADD_ALL_CIPHERS|OPENSSL_INIT_NO_ADD_ALL_DIGESTS,NULL);
    return(0);
}


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Re: BUG: $ORIGIN does not seem to work

[Szabolcs Nagy]

* Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-26 15:39:23 +0200]:
> On glibc the following:
> 
> gcc  -o x -Wl,-rpath='$ORIGIN/lib' x.c -L ./lib -lcrypto
> 
> or
> 
> gcc  -o x -Wl,-rpath,'$ORIGIN/lib' x.c -L ./lib -lcrypto
> 
> Gives me binary with relative library path
> 
> ldd x
>     linux-vdso.so.1 (0x00007ffcb6bee000)
> *    libcrypto.so.1.0.0 => /home/wizard/kal-el/lib/libcrypto.so.1.0.0
> (0x00007f0bc3593000)**
> *    libc.so.6 => /lib64/libc.so.6 (0x00007f0bc31e2000)
>     libdl.so.2 => /lib64/libdl.so.2 (0x00007f0bc2fde000)
>     libz.so.1 => /lib64/libz.so.1 (0x00007f0bc2dc7000)
>     /lib64/ld-linux-x86-64.so.2 (0x00007f0bc39d2000)
> 
> cp -rap kal-el/* batman/
> ldd x
>     linux-vdso.so.1 (0x00007ffdbf0b6000)
> *    libcrypto.so.1.0.0 => /home/wizard/batman/lib/libcrypto.so.1.0.0
> (0x00007fb682149000)**
> *    libc.so.6 => /lib64/libc.so.6 (0x00007fb681d98000)
>     libdl.so.2 => /lib64/libdl.so.2 (0x00007fb681b94000)
>     libz.so.1 => /lib64/libz.so.1 (0x00007fb68197d000)
>     /lib64/ld-linux-x86-64.so.2 (0x00007fb682588000)
> 
> 
> But trying the same with musl does not seem to work?
> ldd x
> /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
> 
> and if i remove the -L ./lib from the command it uses system library
> gcc  -o x -Wl,-rpath,'$ORIGIN/lib'  x.c   -lcrypto
> ldd xx
>     /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7fdd85ed7000)
>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
> 
> 

$ORIGIN in rpath works fine in musl

you are doing something wrong

but it's hard to tell what: your ldd command is looking at
the wrong binary, we don't know what ldd you are using (e.g.
use ld-*-musl.so.1 --list foo to make this explicit), it's
not clear if the binary has $ORIGIN set up correctly since
you showed a gcc command line instead of readelf -d of the
generated executable, we don't know what paths have the
library and what paths the ldso tried (you can check this
by strace).

(there are some differences between musl and glibc:
e.g. glibc expands $ORIGIN in dlopen too while musl does
not, however in your case musl should work)

Re: BUG: $ORIGIN does not seem to work

[Rich Felker]

On Fri, Jan 26, 2018 at 03:39:23PM +0200, Stefan Fröberg wrote:
> Hello
> 
> On glibc the following:
> 
> gcc  -o x -Wl,-rpath='$ORIGIN/lib' x.c -L ./lib -lcrypto
> 
> or
> 
> gcc  -o x -Wl,-rpath,'$ORIGIN/lib' x.c -L ./lib -lcrypto
> 
> Gives me binary with relative library path
> 
> ldd x
>     linux-vdso.so.1 (0x00007ffcb6bee000)
> *    libcrypto.so.1.0.0 => /home/wizard/kal-el/lib/libcrypto.so.1.0.0
> (0x00007f0bc3593000)**
> *    libc.so.6 => /lib64/libc.so.6 (0x00007f0bc31e2000)
>     libdl.so.2 => /lib64/libdl.so.2 (0x00007f0bc2fde000)
>     libz.so.1 => /lib64/libz.so.1 (0x00007f0bc2dc7000)
>     /lib64/ld-linux-x86-64.so.2 (0x00007f0bc39d2000)
> 
> cp -rap kal-el/* batman/
> ldd x
>     linux-vdso.so.1 (0x00007ffdbf0b6000)
> *    libcrypto.so.1.0.0 => /home/wizard/batman/lib/libcrypto.so.1.0.0
> (0x00007fb682149000)**
> *    libc.so.6 => /lib64/libc.so.6 (0x00007fb681d98000)
>     libdl.so.2 => /lib64/libdl.so.2 (0x00007fb681b94000)
>     libz.so.1 => /lib64/libz.so.1 (0x00007fb68197d000)
>     /lib64/ld-linux-x86-64.so.2 (0x00007fb682588000)
> 
> 
> But trying the same with musl does not seem to work?
> ldd x
> /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
> 
> and if i remove the -L ./lib from the command it uses system library
> gcc  -o x -Wl,-rpath,'$ORIGIN/lib'  x.c   -lcrypto
> ldd xx
>     /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7fdd85ed7000)
>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
> 
> 
> GCC version 7.2 and musl 1.1.18
> 
> GCC configured with the following:
> gcc -v
> Using built-in specs.
> COLLECT_GCC=gcc
> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-musl/7.2.0/lto-wrapper
> Target: x86_64-linux-musl
> Configured with: ../configure --prefix=/usr --build=x86_64-linux-musl
> --enable-languages=c,c++,lto --disable-multilib --disable-nls
> --disable-libmudflap --disable-libsanitizer --with-system-zlib
> --disable-werror --enable-gold=yes --enable-ld=yes --enable-plugin
> --enable-plugins --enable-lto --enable-default-pie --enable-default-ssp
> --with-linker-hash-style=gnu --enable-libgomp --with-fpmath=sse
> Thread model: posix
> gcc version 7.2.0 (GCC)
> 
> 
> Best regards
> Stefan Fröberg
> 
> x.c
> ------------------------------
> #include <stdio.h>
> #include <openssl/ssl.h>
> 
> int main(void)
> {
>    
> OPENSSL_init_crypto(OPENSSL_INIT_NO_ADD_ALL_CIPHERS|OPENSSL_INIT_NO_ADD_ALL_DIGESTS,NULL);
>     return(0);
> }
> 

Do you possibly have LD_LIBRARY_PATH set in the environment? glibc
supports both DT_RPATH and DT_RUNPATH with different semantics.
DT_RPATH comes before LD_LIBRARY_PATH and is considered deprecated by
them, whereas DT_RUNPATH comes after LD_LIBRARY_PATH but only affects
search for direct dependencies not indirect ones.

musl only supports one behavior (both are treated as the same). The
rpath/runpath search always comes after LD_LIBRARY_PATH (so you can
override it) and it always affects direct AND indirect dependency
loading.

If that's not the issue, we probably need to see more details (like
readelf output) to know what's going on.

Rich

Re: BUG: $ORIGIN does not seem to work

[Stefan Fröberg]

Hello Rich


Rich Felker kirjoitti 26.01.2018 klo 18:34:
> On Fri, Jan 26, 2018 at 03:39:23PM +0200, Stefan Fröberg wrote:
>> Hello
>>
>> On glibc the following:
>>
>> gcc  -o x -Wl,-rpath='$ORIGIN/lib' x.c -L ./lib -lcrypto
>>
>> or
>>
>> gcc  -o x -Wl,-rpath,'$ORIGIN/lib' x.c -L ./lib -lcrypto
>>
>> Gives me binary with relative library path
>>
>> ldd x
>>     linux-vdso.so.1 (0x00007ffcb6bee000)
>> *    libcrypto.so.1.0.0 => /home/wizard/kal-el/lib/libcrypto.so.1.0.0
>> (0x00007f0bc3593000)**
>> *    libc.so.6 => /lib64/libc.so.6 (0x00007f0bc31e2000)
>>     libdl.so.2 => /lib64/libdl.so.2 (0x00007f0bc2fde000)
>>     libz.so.1 => /lib64/libz.so.1 (0x00007f0bc2dc7000)
>>     /lib64/ld-linux-x86-64.so.2 (0x00007f0bc39d2000)
>>
>> cp -rap kal-el/* batman/
>> ldd x
>>     linux-vdso.so.1 (0x00007ffdbf0b6000)
>> *    libcrypto.so.1.0.0 => /home/wizard/batman/lib/libcrypto.so.1.0.0
>> (0x00007fb682149000)**
>> *    libc.so.6 => /lib64/libc.so.6 (0x00007fb681d98000)
>>     libdl.so.2 => /lib64/libdl.so.2 (0x00007fb681b94000)
>>     libz.so.1 => /lib64/libz.so.1 (0x00007fb68197d000)
>>     /lib64/ld-linux-x86-64.so.2 (0x00007fb682588000)
>>
>>
>> But trying the same with musl does not seem to work?
>> ldd x
>> /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>>
>> and if i remove the -L ./lib from the command it uses system library
>> gcc  -o x -Wl,-rpath,'$ORIGIN/lib'  x.c   -lcrypto
>> ldd xx
>>     /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>>     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7fdd85ed7000)
>>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>>
>>
>> GCC version 7.2 and musl 1.1.18
>>
>> GCC configured with the following:
>> gcc -v
>> Using built-in specs.
>> COLLECT_GCC=gcc
>> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-musl/7.2.0/lto-wrapper
>> Target: x86_64-linux-musl
>> Configured with: ../configure --prefix=/usr --build=x86_64-linux-musl
>> --enable-languages=c,c++,lto --disable-multilib --disable-nls
>> --disable-libmudflap --disable-libsanitizer --with-system-zlib
>> --disable-werror --enable-gold=yes --enable-ld=yes --enable-plugin
>> --enable-plugins --enable-lto --enable-default-pie --enable-default-ssp
>> --with-linker-hash-style=gnu --enable-libgomp --with-fpmath=sse
>> Thread model: posix
>> gcc version 7.2.0 (GCC)
>>
>>
>> Best regards
>> Stefan Fröberg
>>
>> x.c
>> ------------------------------
>> #include <stdio.h>
>> #include <openssl/ssl.h>
>>
>> int main(void)
>> {
>>    
>> OPENSSL_init_crypto(OPENSSL_INIT_NO_ADD_ALL_CIPHERS|OPENSSL_INIT_NO_ADD_ALL_DIGESTS,NULL);
>>     return(0);
>> }
>>
> Do you possibly have LD_LIBRARY_PATH set in the environment? glibc
> supports both DT_RPATH and DT_RUNPATH with different semantics.
> DT_RPATH comes before LD_LIBRARY_PATH and is considered deprecated by
> them, whereas DT_RUNPATH comes after LD_LIBRARY_PATH but only affects
> search for direct dependencies not indirect ones.
> musl only supports one behavior (both are treated as the same). The
> rpath/runpath search always comes after LD_LIBRARY_PATH (so you can
> override it) and it always affects direct AND indirect dependency
> loading.

All those environment variables are empty, in both 64-bit Gentoo host
and also
inside the 64-bit chrooted musl test environment.
>
> If that's not the issue, we probably need to see more details (like
> readelf output) to know what's going on.
>
> Rich

Okay, just please tell me what I have to do.

Best Regards
Stefan Fröberg

Re: BUG: $ORIGIN does not seem to work

[Stefan Fröberg]

Hello Szabolcs


My ldd is just symbolic link inside musl chroot environment, to
/lib/ld-musl-x86_64.so.1
and it's symbolic link to /lib/libc.so

Here is readelf output of that test program
readelf -d x

Dynamic section at offset 0xe10 contains 24 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x000000000000000f (RPATH)              Library rpath: [$ORIGIN/lib]
 0x000000000000000c (INIT)               0x598
 0x000000000000000d (FINI)               0x812
 0x000000006ffffef5 (GNU_HASH)           0x220
 0x0000000000000005 (STRTAB)             0x390
 0x0000000000000006 (SYMTAB)             0x258
 0x000000000000000a (STRSZ)              241 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000003 (PLTGOT)             0x201000
 0x0000000000000002 (PLTRELSZ)           48 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x568
 0x0000000000000007 (RELA)               0x4c0
 0x0000000000000008 (RELASZ)             168 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffb (FLAGS_1)            Flags: PIE
 0x000000006ffffffe (VERNEED)            0x4a0
 0x000000006fffffff (VERNEEDNUM)         1
 0x000000006ffffff0 (VERSYM)             0x482
 0x000000006ffffff9 (RELACOUNT)          2
 0x0000000000000000 (NULL)               0x0

So the $ORIGIN/lib is there but for some reason ldd won't show it???

Best Regards
Stefan Fröberg

Szabolcs Nagy kirjoitti 26.01.2018 klo 16:21:
> * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-26 15:39:23 +0200]:
>> On glibc the following:
>>
>> gcc  -o x -Wl,-rpath='$ORIGIN/lib' x.c -L ./lib -lcrypto
>>
>> or
>>
>> gcc  -o x -Wl,-rpath,'$ORIGIN/lib' x.c -L ./lib -lcrypto
>>
>> Gives me binary with relative library path
>>
>> ldd x
>>     linux-vdso.so.1 (0x00007ffcb6bee000)
>> *    libcrypto.so.1.0.0 => /home/wizard/kal-el/lib/libcrypto.so.1.0.0
>> (0x00007f0bc3593000)**
>> *    libc.so.6 => /lib64/libc.so.6 (0x00007f0bc31e2000)
>>     libdl.so.2 => /lib64/libdl.so.2 (0x00007f0bc2fde000)
>>     libz.so.1 => /lib64/libz.so.1 (0x00007f0bc2dc7000)
>>     /lib64/ld-linux-x86-64.so.2 (0x00007f0bc39d2000)
>>
>> cp -rap kal-el/* batman/
>> ldd x
>>     linux-vdso.so.1 (0x00007ffdbf0b6000)
>> *    libcrypto.so.1.0.0 => /home/wizard/batman/lib/libcrypto.so.1.0.0
>> (0x00007fb682149000)**
>> *    libc.so.6 => /lib64/libc.so.6 (0x00007fb681d98000)
>>     libdl.so.2 => /lib64/libdl.so.2 (0x00007fb681b94000)
>>     libz.so.1 => /lib64/libz.so.1 (0x00007fb68197d000)
>>     /lib64/ld-linux-x86-64.so.2 (0x00007fb682588000)
>>
>>
>> But trying the same with musl does not seem to work?
>> ldd x
>> /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>>
>> and if i remove the -L ./lib from the command it uses system library
>> gcc  -o x -Wl,-rpath,'$ORIGIN/lib'  x.c   -lcrypto
>> ldd xx
>>     /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>>     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7fdd85ed7000)
>>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>>
>>
> $ORIGIN in rpath works fine in musl
>
> you are doing something wrong
>
> but it's hard to tell what: your ldd command is looking at
> the wrong binary, we don't know what ldd you are using (e.g.
> use ld-*-musl.so.1 --list foo to make this explicit), it's
> not clear if the binary has $ORIGIN set up correctly since
> you showed a gcc command line instead of readelf -d of the
> generated executable, we don't know what paths have the
> library and what paths the ldso tried (you can check this
> by strace).
>
> (there are some differences between musl and glibc:
> e.g. glibc expands $ORIGIN in dlopen too while musl does
> not, however in your case musl should work)

Re: BUG: $ORIGIN does not seem to work

[Szabolcs Nagy]

* Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 01:50:21 +0200]:
> My ldd is just symbolic link inside musl chroot environment, to
> /lib/ld-musl-x86_64.so.1
> and it's symbolic link to /lib/libc.so
> 
> Here is readelf output of that test program
> readelf -d x
> 
> Dynamic section at offset 0xe10 contains 24 entries:
>   Tag        Type                         Name/Value
>  0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
                                                            ^^^^^^^^^^^^^^^^
this looks like the wrong library version

if you had straced the ldd output you would have seen
that musl tries to open lib/libcrypto.so.1.1, but you
probably only have lib/libcrypto.so.1.0.0 based on the
glibc ldd output below.

at link time you need to make sure ld picks up the
right libcrypto.

>  0x0000000000000001 (NEEDED)             Shared library: [libc.so]
>  0x000000000000000f (RPATH)              Library rpath: [$ORIGIN/lib]
>  0x000000000000000c (INIT)               0x598
>  0x000000000000000d (FINI)               0x812
>  0x000000006ffffef5 (GNU_HASH)           0x220
>  0x0000000000000005 (STRTAB)             0x390
>  0x0000000000000006 (SYMTAB)             0x258
>  0x000000000000000a (STRSZ)              241 (bytes)
>  0x000000000000000b (SYMENT)             24 (bytes)
>  0x0000000000000015 (DEBUG)              0x0
>  0x0000000000000003 (PLTGOT)             0x201000
>  0x0000000000000002 (PLTRELSZ)           48 (bytes)
>  0x0000000000000014 (PLTREL)             RELA
>  0x0000000000000017 (JMPREL)             0x568
>  0x0000000000000007 (RELA)               0x4c0
>  0x0000000000000008 (RELASZ)             168 (bytes)
>  0x0000000000000009 (RELAENT)            24 (bytes)
>  0x000000006ffffffb (FLAGS_1)            Flags: PIE
>  0x000000006ffffffe (VERNEED)            0x4a0
>  0x000000006fffffff (VERNEEDNUM)         1
>  0x000000006ffffff0 (VERSYM)             0x482
>  0x000000006ffffff9 (RELACOUNT)          2
>  0x0000000000000000 (NULL)               0x0
> 
> So the $ORIGIN/lib is there but for some reason ldd won't show it???
> 
> Best Regards
> Stefan Fröberg
> 
> Szabolcs Nagy kirjoitti 26.01.2018 klo 16:21:
> > * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-26 15:39:23 +0200]:
> >> On glibc the following:
> >>
> >> gcc  -o x -Wl,-rpath='$ORIGIN/lib' x.c -L ./lib -lcrypto
> >>
> >> or
> >>
> >> gcc  -o x -Wl,-rpath,'$ORIGIN/lib' x.c -L ./lib -lcrypto
> >>
> >> Gives me binary with relative library path
> >>
> >> ldd x
> >>     linux-vdso.so.1 (0x00007ffcb6bee000)
> >> *    libcrypto.so.1.0.0 => /home/wizard/kal-el/lib/libcrypto.so.1.0.0
> >> (0x00007f0bc3593000)**
> >> *    libc.so.6 => /lib64/libc.so.6 (0x00007f0bc31e2000)
> >>     libdl.so.2 => /lib64/libdl.so.2 (0x00007f0bc2fde000)
> >>     libz.so.1 => /lib64/libz.so.1 (0x00007f0bc2dc7000)
> >>     /lib64/ld-linux-x86-64.so.2 (0x00007f0bc39d2000)
> >>
> >> cp -rap kal-el/* batman/
> >> ldd x
> >>     linux-vdso.so.1 (0x00007ffdbf0b6000)
> >> *    libcrypto.so.1.0.0 => /home/wizard/batman/lib/libcrypto.so.1.0.0
> >> (0x00007fb682149000)**
> >> *    libc.so.6 => /lib64/libc.so.6 (0x00007fb681d98000)
> >>     libdl.so.2 => /lib64/libdl.so.2 (0x00007fb681b94000)
> >>     libz.so.1 => /lib64/libz.so.1 (0x00007fb68197d000)
> >>     /lib64/ld-linux-x86-64.so.2 (0x00007fb682588000)
> >>
> >>
> >> But trying the same with musl does not seem to work?
> >> ldd x
> >> /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
> >>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
> >>
> >> and if i remove the -L ./lib from the command it uses system library
> >> gcc  -o x -Wl,-rpath,'$ORIGIN/lib'  x.c   -lcrypto
> >> ldd xx
> >>     /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
> >>     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7fdd85ed7000)
> >>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
> >>
> >>
> > $ORIGIN in rpath works fine in musl
> >
> > you are doing something wrong
> >
> > but it's hard to tell what: your ldd command is looking at
> > the wrong binary, we don't know what ldd you are using (e.g.
> > use ld-*-musl.so.1 --list foo to make this explicit), it's
> > not clear if the binary has $ORIGIN set up correctly since
> > you showed a gcc command line instead of readelf -d of the
> > generated executable, we don't know what paths have the
> > library and what paths the ldso tried (you can check this
> > by strace).
> >
> > (there are some differences between musl and glibc:
> > e.g. glibc expands $ORIGIN in dlopen too while musl does
> > not, however in your case musl should work)

Re: BUG: $ORIGIN does not seem to work

[Stefan Fröberg]

Hi


Szabolcs Nagy kirjoitti 27.01.2018 klo 13:07:
> * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 01:50:21 +0200]:
>> My ldd is just symbolic link inside musl chroot environment, to
>> /lib/ld-musl-x86_64.so.1
>> and it's symbolic link to /lib/libc.so
>>
>> Here is readelf output of that test program
>> readelf -d x
>>
>> Dynamic section at offset 0xe10 contains 24 entries:
>>   Tag        Type                         Name/Value
>>  0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
>                                                             ^^^^^^^^^^^^^^^^
> this looks like the wrong library version
>
> if you had straced the ldd output you would have seen
> that musl tries to open lib/libcrypto.so.1.1, but you
> probably only have lib/libcrypto.so.1.0.0 based on the
> glibc ldd output below.
No, that ldd was run inside, pure, chrooted musl environment. No glibc
inside.
These are the only libcrypto* files inside that chroot environment:

 ls -lah /usr/lib/libcrypto.*
-rw-r--r--    1 0        0           5.0M Dec 17 00:24 /usr/lib/libcrypto.a
lrwxrwxrwx    1 0        0             16 Dec 17 00:24
/usr/lib/libcrypto.so -> libcrypto.so.1.1
-rwxr-xr-x    1 0        0           3.0M Jan 26 12:58
/usr/lib/libcrypto.so.1.1

Best Regards
Stefan

> at link time you need to make sure ld picks up the
> right libcrypto.
>
>>  0x0000000000000001 (NEEDED)             Shared library: [libc.so]
>>  0x000000000000000f (RPATH)              Library rpath: [$ORIGIN/lib]
>>  0x000000000000000c (INIT)               0x598
>>  0x000000000000000d (FINI)               0x812
>>  0x000000006ffffef5 (GNU_HASH)           0x220
>>  0x0000000000000005 (STRTAB)             0x390
>>  0x0000000000000006 (SYMTAB)             0x258
>>  0x000000000000000a (STRSZ)              241 (bytes)
>>  0x000000000000000b (SYMENT)             24 (bytes)
>>  0x0000000000000015 (DEBUG)              0x0
>>  0x0000000000000003 (PLTGOT)             0x201000
>>  0x0000000000000002 (PLTRELSZ)           48 (bytes)
>>  0x0000000000000014 (PLTREL)             RELA
>>  0x0000000000000017 (JMPREL)             0x568
>>  0x0000000000000007 (RELA)               0x4c0
>>  0x0000000000000008 (RELASZ)             168 (bytes)
>>  0x0000000000000009 (RELAENT)            24 (bytes)
>>  0x000000006ffffffb (FLAGS_1)            Flags: PIE
>>  0x000000006ffffffe (VERNEED)            0x4a0
>>  0x000000006fffffff (VERNEEDNUM)         1
>>  0x000000006ffffff0 (VERSYM)             0x482
>>  0x000000006ffffff9 (RELACOUNT)          2
>>  0x0000000000000000 (NULL)               0x0
>>
>> So the $ORIGIN/lib is there but for some reason ldd won't show it???
>>
>> Best Regards
>> Stefan Fröberg
>>
>> Szabolcs Nagy kirjoitti 26.01.2018 klo 16:21:
>>> * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-26 15:39:23 +0200]:
>>>> On glibc the following:
>>>>
>>>> gcc  -o x -Wl,-rpath='$ORIGIN/lib' x.c -L ./lib -lcrypto
>>>>
>>>> or
>>>>
>>>> gcc  -o x -Wl,-rpath,'$ORIGIN/lib' x.c -L ./lib -lcrypto
>>>>
>>>> Gives me binary with relative library path
>>>>
>>>> ldd x
>>>>     linux-vdso.so.1 (0x00007ffcb6bee000)
>>>> *    libcrypto.so.1.0.0 => /home/wizard/kal-el/lib/libcrypto.so.1.0.0
>>>> (0x00007f0bc3593000)**
>>>> *    libc.so.6 => /lib64/libc.so.6 (0x00007f0bc31e2000)
>>>>     libdl.so.2 => /lib64/libdl.so.2 (0x00007f0bc2fde000)
>>>>     libz.so.1 => /lib64/libz.so.1 (0x00007f0bc2dc7000)
>>>>     /lib64/ld-linux-x86-64.so.2 (0x00007f0bc39d2000)
>>>>
>>>> cp -rap kal-el/* batman/
>>>> ldd x
>>>>     linux-vdso.so.1 (0x00007ffdbf0b6000)
>>>> *    libcrypto.so.1.0.0 => /home/wizard/batman/lib/libcrypto.so.1.0.0
>>>> (0x00007fb682149000)**
>>>> *    libc.so.6 => /lib64/libc.so.6 (0x00007fb681d98000)
>>>>     libdl.so.2 => /lib64/libdl.so.2 (0x00007fb681b94000)
>>>>     libz.so.1 => /lib64/libz.so.1 (0x00007fb68197d000)
>>>>     /lib64/ld-linux-x86-64.so.2 (0x00007fb682588000)
>>>>
>>>>
>>>> But trying the same with musl does not seem to work?
>>>> ldd x
>>>> /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>>>>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f07372e2000)
>>>>
>>>> and if i remove the -L ./lib from the command it uses system library
>>>> gcc  -o x -Wl,-rpath,'$ORIGIN/lib'  x.c   -lcrypto
>>>> ldd xx
>>>>     /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>>>>     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7fdd85ed7000)
>>>>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7fdd8618d000)
>>>>
>>>>
>>> $ORIGIN in rpath works fine in musl
>>>
>>> you are doing something wrong
>>>
>>> but it's hard to tell what: your ldd command is looking at
>>> the wrong binary, we don't know what ldd you are using (e.g.
>>> use ld-*-musl.so.1 --list foo to make this explicit), it's
>>> not clear if the binary has $ORIGIN set up correctly since
>>> you showed a gcc command line instead of readelf -d of the
>>> generated executable, we don't know what paths have the
>>> library and what paths the ldso tried (you can check this
>>> by strace).
>>>
>>> (there are some differences between musl and glibc:
>>> e.g. glibc expands $ORIGIN in dlopen too while musl does
>>> not, however in your case musl should work)

Re: BUG: $ORIGIN does not seem to work

[Rich Felker]

On Sat, Jan 27, 2018 at 06:20:27PM +0200, Stefan Fröberg wrote:
> Hi
> 
> 
> Szabolcs Nagy kirjoitti 27.01.2018 klo 13:07:
> > * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 01:50:21 +0200]:
> >> My ldd is just symbolic link inside musl chroot environment, to
> >> /lib/ld-musl-x86_64.so.1
> >> and it's symbolic link to /lib/libc.so
> >>
> >> Here is readelf output of that test program
> >> readelf -d x
> >>
> >> Dynamic section at offset 0xe10 contains 24 entries:
> >>   Tag        Type                         Name/Value
> >>  0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
> >                                                             ^^^^^^^^^^^^^^^^
> > this looks like the wrong library version
> >
> > if you had straced the ldd output you would have seen
> > that musl tries to open lib/libcrypto.so.1.1, but you
> > probably only have lib/libcrypto.so.1.0.0 based on the
> > glibc ldd output below.
> No, that ldd was run inside, pure, chrooted musl environment. No glibc
> inside.
> These are the only libcrypto* files inside that chroot environment:
> 
>  ls -lah /usr/lib/libcrypto.*
> -rw-r--r--    1 0        0           5.0M Dec 17 00:24 /usr/lib/libcrypto.a
> lrwxrwxrwx    1 0        0             16 Dec 17 00:24
> /usr/lib/libcrypto.so -> libcrypto.so.1.1
> -rwxr-xr-x    1 0        0           3.0M Jan 26 12:58
> /usr/lib/libcrypto.so.1.1

OK, but it still means ld picked up a different version of libcrypto
(at link time) and encoded the dependency on that different version.
You need to ensure that gcc/ld is searching your lib dir at link time.

BTW running the program itself or ldd under strace can be very
informative to see what's happening.

Rich

Re: BUG: $ORIGIN does not seem to work

[Stefan Fröberg]

Hi Rich


Rich Felker kirjoitti 27.01.2018 klo 18:42:
> On Sat, Jan 27, 2018 at 06:20:27PM +0200, Stefan Fröberg wrote:
>> Hi
>>
>>
>> Szabolcs Nagy kirjoitti 27.01.2018 klo 13:07:
>>> * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 01:50:21 +0200]:
>>>> My ldd is just symbolic link inside musl chroot environment, to
>>>> /lib/ld-musl-x86_64.so.1
>>>> and it's symbolic link to /lib/libc.so
>>>>
>>>> Here is readelf output of that test program
>>>> readelf -d x
>>>>
>>>> Dynamic section at offset 0xe10 contains 24 entries:
>>>>   Tag        Type                         Name/Value
>>>>  0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
>>>                                                             ^^^^^^^^^^^^^^^^
>>> this looks like the wrong library version
>>>
>>> if you had straced the ldd output you would have seen
>>> that musl tries to open lib/libcrypto.so.1.1, but you
>>> probably only have lib/libcrypto.so.1.0.0 based on the
>>> glibc ldd output below.
>> No, that ldd was run inside, pure, chrooted musl environment. No glibc
>> inside.
>> These are the only libcrypto* files inside that chroot environment:
>>
>>  ls -lah /usr/lib/libcrypto.*
>> -rw-r--r--    1 0        0           5.0M Dec 17 00:24 /usr/lib/libcrypto.a
>> lrwxrwxrwx    1 0        0             16 Dec 17 00:24
>> /usr/lib/libcrypto.so -> libcrypto.so.1.1
>> -rwxr-xr-x    1 0        0           3.0M Jan 26 12:58
>> /usr/lib/libcrypto.so.1.1
> OK, but it still means ld picked up a different version of libcrypto
> (at link time) and encoded the dependency on that different version.
> You need to ensure that gcc/ld is searching your lib dir at link time.
>
> BTW running the program itself or ldd under strace can be very
> informative to see what's happening.
>
> Rich
>

Well, I can of course try to compile libcrypto again completely from
scratch inside that  chroot environment and see if it helps.

Best Regards
Stefan

Re: BUG: $ORIGIN does not seem to work

[Szabolcs Nagy]

* Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 18:20:27 +0200]:
> Szabolcs Nagy kirjoitti 27.01.2018 klo 13:07:
> > * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 01:50:21 +0200]:
> >> My ldd is just symbolic link inside musl chroot environment, to
> >> /lib/ld-musl-x86_64.so.1
> >> and it's symbolic link to /lib/libc.so
> >>
> >> Here is readelf output of that test program
> >> readelf -d x
> >>
> >> Dynamic section at offset 0xe10 contains 24 entries:
> >>   Tag        Type                         Name/Value
> >>  0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
> >                                                             ^^^^^^^^^^^^^^^^
> > this looks like the wrong library version
> >
> > if you had straced the ldd output you would have seen
> > that musl tries to open lib/libcrypto.so.1.1, but you
> > probably only have lib/libcrypto.so.1.0.0 based on the
> > glibc ldd output below.
> No, that ldd was run inside, pure, chrooted musl environment. No glibc
> inside.

this does not matter

> These are the only libcrypto* files inside that chroot environment:
> 
>  ls -lah /usr/lib/libcrypto.*
> -rw-r--r--    1 0        0           5.0M Dec 17 00:24 /usr/lib/libcrypto.a
> lrwxrwxrwx    1 0        0             16 Dec 17 00:24
> /usr/lib/libcrypto.so -> libcrypto.so.1.1
> -rwxr-xr-x    1 0        0           3.0M Jan 26 12:58
> /usr/lib/libcrypto.so.1.1
> 

like i said, you linked the wrong library, try to link
the right one. again, if you run the ldso under strace
the problem will be obvious and we dont have to waste time.

you should also strace ld to see what gets linked,
if it's /usr/lib/libcrypto... then that's wrong.
(instead of strace you can use -Wl,--trace)

Re: BUG: $ORIGIN does not seem to work

[Stefan Fröberg]

Hi

Here is the strace

strace ./x

execve("./x", ["./x"], 0x7ffc8a938740 /* 20 vars */) = 0
arch_prctl(ARCH_SET_FS, 0x7fb0d02cfba8) = 0
set_tid_address(0x7fb0d02cfbe0)         = 2954
readlink("/proc/self/exe", "/root/batman/x", 512) = 14
open("/root/batman/lib/libcrypto.so.1.1", O_RDONLY|O_CLOEXEC) = 3
fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
fstat(3, {st_mode=S_IFREG|0755, st_size=2800952, ...}) = 0
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\220\6\0\0\0\0\0"...,
960) = 960
mmap(NULL, 4911104, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x7fb0cfb92000
mmap(0x7fb0d0016000, 176128, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED, 3, 0x284000) = 0x7fb0d0016000
mmap(0x7fb0d003e000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fb0d003e000
close(3)                                = 0
mprotect(0x7fb0d0016000, 122880, PROT_READ) = 0
mprotect(0x7fb0d02cc000, 4096, PROT_READ) = 0
mprotect(0x5574fa625000, 4096, PROT_READ) = 0
ioctl(1, TIOCGWINSZ, {ws_row=34, ws_col=107, ws_xpixel=1284,
ws_ypixel=748}) = 0
writev(1, [{iov_base="Initializing crypto ... OK", iov_len=26},
{iov_base="\n", iov_len=1}], 2Initializing crypto ... OK
) = 27
exit_group(0)                           = ?
+++ exited with 0 +++
./x
Initializing crypto ... OK
So it find and uses the correct, local version $ORIGIN/lib
(/root/batman/lib/libcrypto.so.1.1) of libcrypto.so.1.1
and "readelf -d x"  confirms it.

But for some reason ldd does not show it.

ldd x
    /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)
    libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7f22ef352000)
    libc.so => /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)

********************************************************************
#include <stdio.h>
#include <openssl/ssl.h>

int main(void)
{
    printf("Initializing crypto ... ");
    int    r =
OPENSSL_init_crypto(OPENSSL_INIT_NO_ADD_ALL_CIPHERS|OPENSSL_INIT_NO_ADD_ALL_DIGESTS,NULL);
    printf("%s\n",(r == 1 ? "OK" : "FAILED"));
    return(0);
}
*********************************************************************
readelf -d x

Dynamic section at offset 0xe10 contains 24 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x000000000000000f (RPATH)              Library rpath: [$ORIGIN/lib]
 0x000000000000000c (INIT)               0x608
 0x000000000000000d (FINI)               0x8e2
 0x000000006ffffef5 (GNU_HASH)           0x220
 0x0000000000000005 (STRTAB)             0x3c0
 0x0000000000000006 (SYMTAB)             0x258
 0x000000000000000a (STRSZ)              253 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000003 (PLTGOT)             0x201000
 0x0000000000000002 (PLTRELSZ)           96 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x5a8
 0x0000000000000007 (RELA)               0x500
 0x0000000000000008 (RELASZ)             168 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffb (FLAGS_1)            Flags: PIE
 0x000000006ffffffe (VERNEED)            0x4e0
 0x000000006fffffff (VERNEEDNUM)         1
 0x000000006ffffff0 (VERSYM)             0x4be
 0x000000006ffffff9 (RELACOUNT)          2
 0x0000000000000000 (NULL)               0x0

Szabolcs Nagy kirjoitti 27.01.2018 klo 21:26:
> * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 18:20:27 +0200]:
>> Szabolcs Nagy kirjoitti 27.01.2018 klo 13:07:
>>> * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-27 01:50:21 +0200]:
>>>> My ldd is just symbolic link inside musl chroot environment, to
>>>> /lib/ld-musl-x86_64.so.1
>>>> and it's symbolic link to /lib/libc.so
>>>>
>>>> Here is readelf output of that test program
>>>> readelf -d x
>>>>
>>>> Dynamic section at offset 0xe10 contains 24 entries:
>>>>   Tag        Type                         Name/Value
>>>>  0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
>>>                                                             ^^^^^^^^^^^^^^^^
>>> this looks like the wrong library version
>>>
>>> if you had straced the ldd output you would have seen
>>> that musl tries to open lib/libcrypto.so.1.1, but you
>>> probably only have lib/libcrypto.so.1.0.0 based on the
>>> glibc ldd output below.
>> No, that ldd was run inside, pure, chrooted musl environment. No glibc
>> inside.
> this does not matter
>
>> These are the only libcrypto* files inside that chroot environment:
>>
>>  ls -lah /usr/lib/libcrypto.*
>> -rw-r--r--    1 0        0           5.0M Dec 17 00:24 /usr/lib/libcrypto.a
>> lrwxrwxrwx    1 0        0             16 Dec 17 00:24
>> /usr/lib/libcrypto.so -> libcrypto.so.1.1
>> -rwxr-xr-x    1 0        0           3.0M Jan 26 12:58
>> /usr/lib/libcrypto.so.1.1
>>
> like i said, you linked the wrong library, try to link
> the right one. again, if you run the ldso under strace
> the problem will be obvious and we dont have to waste time.
>
> you should also strace ld to see what gets linked,
> if it's /usr/lib/libcrypto... then that's wrong.
> (instead of strace you can use -Wl,--trace)

Re: BUG: $ORIGIN does not seem to work

[Szabolcs Nagy]

* Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-28 00:07:33 +0200]:
> strace ./x
...
> open("/root/batman/lib/libcrypto.so.1.1", O_RDONLY|O_CLOEXEC) = 3
...
> ldd x
>     /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)
>     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7f22ef352000)
>     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)

this is a bug in musl ldd: if the executable
path has no / then it assumes origin is /, try

ldd ./x

then origin is ./ so it works as expected.

Re: BUG: $ORIGIN does not seem to work

[Rich Felker]

[-- Attachment #1: Type: text/plain, Size: 903 bytes --]

On Sun, Jan 28, 2018 at 01:54:25AM +0100, Szabolcs Nagy wrote:
> * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-28 00:07:33 +0200]:
> > strace ./x
> ...
> > open("/root/batman/lib/libcrypto.so.1.1", O_RDONLY|O_CLOEXEC) = 3
> ...
> > ldd x
> >     /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)
> >     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7f22ef352000)
> >     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)
> 
> this is a bug in musl ldd: if the executable
> path has no / then it assumes origin is /, try
> 
> ldd ./x
> 
> then origin is ./ so it works as expected.

Does the attached patch look ok?

Alternatively we could fix the assumed invariant that p->name always
contains a slash by having the loader code in __dls3 allocate a copy
of argv[0] with "./" prepended, but that's a heavier cost at runtime
and doesn't seem to have any practical advantages.

Rich

[-- Attachment #2: ldd-curdir.diff --]
[-- Type: text/plain, Size: 435 bytes --]

diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 3380240..f507bc4 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -807,7 +807,12 @@ static int fixup_rpath(struct dso *p, char *buf, size_t buf_size)
 		origin = p->name;
 	}
 	t = strrchr(origin, '/');
-	l = t ? t-origin : 0;
+	if (t) {
+		l = t-origin;
+	} else {
+		origin = ".";
+		l = 1;
+	}
 	p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1);
 	if (!p->rpath) return -1;
 

Re: BUG: $ORIGIN does not seem to work

[Szabolcs Nagy]

* Rich Felker <dalias@libc.org> [2018-02-07 12:35:31 -0500]:
> On Sun, Jan 28, 2018 at 01:54:25AM +0100, Szabolcs Nagy wrote:
> > * Stefan Fröberg <stefan.froberg@petroprogram.com> [2018-01-28 00:07:33 +0200]:
> > > strace ./x
> > ...
> > > open("/root/batman/lib/libcrypto.so.1.1", O_RDONLY|O_CLOEXEC) = 3
> > ...
> > > ldd x
> > >     /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)
> > >     libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1 (0x7f22ef352000)
> > >     libc.so => /lib/ld-musl-x86_64.so.1 (0x7f22efa03000)
> > 
> > this is a bug in musl ldd: if the executable
> > path has no / then it assumes origin is /, try
> > 
> > ldd ./x
> > 
> > then origin is ./ so it works as expected.
> 
> Does the attached patch look ok?
> 

looks good.

> Alternatively we could fix the assumed invariant that p->name always
> contains a slash by having the loader code in __dls3 allocate a copy
> of argv[0] with "./" prepended, but that's a heavier cost at runtime
> and doesn't seem to have any practical advantages.
> 
> Rich

> diff --git a/ldso/dynlink.c b/ldso/dynlink.c
> index 3380240..f507bc4 100644
> --- a/ldso/dynlink.c
> +++ b/ldso/dynlink.c
> @@ -807,7 +807,12 @@ static int fixup_rpath(struct dso *p, char *buf, size_t buf_size)
>  		origin = p->name;
>  	}
>  	t = strrchr(origin, '/');
> -	l = t ? t-origin : 0;
> +	if (t) {
> +		l = t-origin;
> +	} else {
> +		origin = ".";
> +		l = 1;
> +	}
>  	p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1);
>  	if (!p->rpath) return -1;
>