LDP
/
man-pages
mirror of https://github.com/mkerrisk/man-pages
0
1
Fork 0
Code Releases Activity

ld.so.8: List more places in which dynamic string tokens are expanded 

This happens for more than just DT_RPATH/DT_RUNPATH.

Signed-off-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Florian Weimer 2020-07-20 12:00:23 +02:00 committed by Michael Kerrisk
parent 9eff2f495f
commit 8aea307b4f
1 changed files with 37 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
man8/ld.so.8
View File

@ -97,12 +97,41 @@ and then
If the binary was linked with the
.B \-z nodeflib
linker option, this step is skipped.
.SS Rpath token expansion
.SS Dynamic string tokens
.PP
The dynamic linker
understands certain token strings in an rpath specification
(DT_RPATH or DT_RUNPATH).
Those strings are substituted as follows:
In several places, the dynamic linker expands dynamic string tokens:
.IP o 3
In the environment variables
.BR LD_LIBRARY_PATH ,
.BR LD_PRELOAD ,
and
.BR LD_AUDIT ,
.IP o 3
inside the values of the dynamic section tags
.BR DT_NEEDED ,
.BR DT_RPATH ,
.BR DT_RUNPATH ,
.BR DT_AUDIT ,
and
.BR DT_DEPAUDIT
of ELF binaries,
.IP o 3
in the arguments to the
.B ld.so
command line options
.BR \-\-audit ,
.BR \-\-library-path ,
and
.B \-\-preload
(see below), and
.IP o 3
in the file name arguments to the
.BR dlopen (3)
and
.BR dlmopen (3)
functions.
.PP
The substituted tokens are as follows.
.TP
.IR $ORIGIN " (or equivalently " ${ORIGIN} )
This expands to
@ -156,6 +185,9 @@ value in the auxiliary vector (see
.\"
.\" ld.so lets names be abbreviated, so $O will work for $ORIGIN;
.\" Don't do this!!
.PP
Note that the dynamic string tokens have to be quoted properly when
set from a shell, to prevent their expension as environment variables.
.SH OPTIONS
.TP
.BI \-\-audit " list"