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author | Florian Weimer <fweimer@redhat.com> | 2020-07-20 12:00:23 +0200 |
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committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2020-07-20 13:36:19 +0200 |
commit | 8aea307b4f0dbe179588be71464da771ab85fdbc (patch) | |
tree | e936d7f08b0523a45e13d0dc237074b48bb53f50 /man8 | |
parent | 9eff2f495f894f9443e2c57e878a4f2cd6f5f730 (diff) | |
download | man-pages-8aea307b4f0dbe179588be71464da771ab85fdbc.tar.gz |
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>
Diffstat (limited to 'man8')
-rw-r--r-- | man8/ld.so.8 | 42 |
1 files changed, 37 insertions, 5 deletions
diff --git a/man8/ld.so.8 b/man8/ld.so.8 index 2e98b7f5a4..80f57a5418 100644 --- a/man8/ld.so.8 +++ b/man8/ld.so.8 @@ -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" |