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author | Christopher R. Palmer <crpalmer@gmail.com> | 2017-04-08 22:40:01 +0200 |
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committer | Rashed Abdel-Tawab <rashed@linux.com> | 2017-10-28 18:46:18 -0700 |
commit | e39f25242a67bed84403365c3de6f9cc4a7fdec3 (patch) | |
tree | 9744710f0a72d073a469ffb75e184ca5f5daa4be /tests/libs/dlsym_from_this_functions.cpp | |
parent | 34343c81d87bafcb2bfc890360e117856738b9fc (diff) | |
download | android_bionic-staging/lineage-15.0_rebase-android-8.0.0_r23.tar.gz android_bionic-staging/lineage-15.0_rebase-android-8.0.0_r23.tar.bz2 android_bionic-staging/lineage-15.0_rebase-android-8.0.0_r23.zip |
linker: Add support for dynamic SHIM librariesstaging/lineage-15.0_rebase-android-8.0.0_r23
Add a new environment variable
LD_SHIM_LIBS
that is a colon (":") separated list of vertical bar ("|") separated pairs.
The pairs are the name for a soinfo reference (executable or shared library)
followed by the name of the shim library to load. For example:
LD_SHIM_LIBS=rmt_storage|libshim_ioprio.so:/system/lib/libicuuv.so|libshim_icu53.so
will instruct the linker to load the dynamic library libshim_ioprio.so
whenver rmt_storage is executed [*] and will load libshim_icu53.so whenever
any executable or other shared library links against /system/lib/libicuuv.so.
There are no restrictions against circular references. In this example,
libshim_icu53.so can link against libicuuv.so which provides a simple and
convenient means of adding compatibility symbols.
[*] Note that the absolute path is not available to the linker and therefore
using the name of executables does depend on the invocation and therefore
should only be used if absolutely necessary. That is, running
/system/bin/rmt_storage would not load any shim libs in this example because
it does not match the name of the invocation of the command.
If you have trouble determining the sonames being loaded, you can also set
the environment variable LD_DEBUG=1 which will cause additional information
to be logged to help trace the detection of the shim libs.
Change-Id: I0ef80fa466167f7bcb7dac90842bef1c3cf879b6
linker: Fix the fact that shim libs do not properly call constructors
Change-Id: I34333e13443a154e675b853fa41442351bc4243a
linker: Don't try to walk the g_active_shim_libs when doing dlsym
This is a bug in the original shim_lib implementation which was
doing the shim lib resolution both when loading the libraries
and when doing the dynamic symbol resolution.
Change-Id: Ib2df0498cf551b3bbd37d7c351410b9908eb1795
Revert "Revert "linker: Reset the active shim libs each time we do a dlopen""
This reverts commit fd0140b028dedabc572f4659cc015edfeee3cd60.
Change-Id: I42b3acfcdc6b84251a396b9e42604bb5685196bd
Make shim lib load failure non-fatal.
Instead, print an appropriate warning message. Aborting symbol
resolution on shim lib load failure leads to weird symbol lookup
failures, because symbols in libraries referenced after the one loading
the shim won't be loaded anymore without a log message stating why that
happened.
Change-Id: Ic3ad7095ddae7ea1039cb6a18603d5cde8a16143
bionic: Do not allow LD_SHIM_LIBS for setuid executables
That's really not safe...
Change-Id: If79af951830966fc21812cd0f60a8998a752a941
bionic: linker: Load shim libs *before* the self-linked libs
By loading them earlier, this allows us to override a symbol in
a library that is being directly linked.
I believe this explains why some people have had problems shimming
one lib but when the changet he shim to be against a different
lib it magically works.
It also makes it possible to override some symbols that were
nearly impossible to override before this change. For example, it is
pretty much impossible to override a symbol in libutils without
this change because it's loaded almost everywhere so no matter
where you try to place the shimming, it will be too late and
the other symbol will have priority.
In particularly, this is necessary to be able to correctly
shim the VectorImpl symbols for dlx.
Change-Id: I461ca416bc288e28035352da00fde5f34f8d9ffa
linker: Allow text-relocs for x86 (only)
This effectively reverts
https://android.googlesource.com/platform/bionic/+/e4ad91f86a47b39612e030a162f4793cb3421d31%5E%21/#F0
for x86 platforms. Unfortunately, this seems like it is required
if we are going to support ffmpeg. The ffmpeg team decreed that they
require text relocations for x86 (only) and that they would not
fix the fact that android 6.0 makes ffmpeg unusable on x86:
https://trac.ffmpeg.org/ticket/4928
Change-Id: I68397f4d62f4f6acd8e0d41b7ecdc115969b890a
linker: Update find_library call for shimlibs
commits 0cdef7e7f3c6837b56a969120d9098463d1df8d8
"Respect caller DT_RUNPATH in dlopen()."
and 42d5fcb9f494eb45de3b6bf759f4a18076e84728
"Introducing linker namespaces"
added new arguments to find_library, add them here.
Change-Id: I8f35a45b00d14f8b2ce01a0a96d2dc7759be04a6
linker: Update LD_SHIM_LIBS parser function
* Upgrade the code using the same changes as
42d5fcb9f494eb45de3b6bf759f4a18076e84728
bda20e78f0f314dbbf0f0bbcf0740cf2d6a4b85e
Change-Id: Ic8be0871945bd9feccd0f94a6770f3cc78a70a0f
Inject shim libs as if they were DT_NEEDED.
The previous separate approach had one flaw: If the shim lib requires
another lib that's already loaded, find_library_internal() would return
the previously loaded copy, but the later load action would fail as the
ELF reader map of the initial loading round was already discarded and
thus a new ElfReader instance for the soinfo instance was created, which
didn't know about the previous reading/loading state.
Change-Id: Ib224dbd35d114197097e3dee14a077cc9130fedb
linker: Make platform text relocations denial enabled by default
* msm8960 variant to support relocations by default
* Partial revert "Remove textrels support for platform libs"
commit 8068786ae67835291521e52f39c695e40f3ad20d.
Change-Id: I994ab1a600a0b237b496ceebe2dd54febc28a6bd
linker: load shims prior to dt_needed check
This allows shims to override existing symbols, not just
inject new symbols.
Change-Id: Ib9216bcc651d8d38999c593babb94d76dc1dbc95
Author: Adrian DC <radian.dc@gmail.com>
Date: Sat, 8 Apr 2017 22:40:01 +0200
* Adapt to latest AOSP Oreo bionic linker changes
* Additional header to avoid unused function
Change-Id: Ib9216bcc651d8d38999c593babb94d76dc1dbc95
Change-Id: Ic3ad7095ddae7ea1039cb6a18603d5cde8a16152
Diffstat (limited to 'tests/libs/dlsym_from_this_functions.cpp')
0 files changed, 0 insertions, 0 deletions