84 lines
2.8 KiB
Markdown
84 lines
2.8 KiB
Markdown
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# Linker config file format
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This document describes format of /system/etc/ld.config.txt file. This file can be used to customize
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linker-namespace setup for dynamic executables.
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## Overview
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The configuration consists of 2 parts
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1. Mappings - maps executable locations to sections
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2. Sections - contains linker-namespace configuration
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## Mappings
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This part of the document maps location of an executable to a section. Here is an example
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The format is `dir.<section_name>=<directory>`
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The mappings should be defined between start of ld.config.txt and the first section.
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## Section
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Every section starts with `[section_name]` (which is used in mappings) and it defines namespaces
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configuration using set of properties described in example below.
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## Example
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```
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# The following line maps section to a dir. Binraies ran from this location will use namespaces
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# configuration specified in [example_section] below
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dir.example_section=/system/bin/example
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# Section starts
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[example_section]
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# When this flag is set to true linker will set target_sdk_version for this binary to
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# the version specified in <dirname>/.version file, where <dirname> = dirname(executable_path)
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#
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# default value is false
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enable.target.sdk.version = true
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# This property can be used to declare additional namespaces.Note that there is always the default
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# namespace. The default namespace is the namespace for the main executable. This list is
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# comma-separated.
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additional.namespaces = ns1
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# Each namespace property starts with "namespace.<namespace-name>" The following is configuration
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# for the default namespace
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# Is namespace isolated - the default value is false
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namespace.default.isolated = true
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# Default namespace search path. Note that ${LIB} here is substituted with "lib" for 32bit targets
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# and with "lib64" for 64bit ones.
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namespace.default.search.paths = /system/${LIB}:/system/other/${LIB}
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# ... same for asan
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namespace.default.asan.search.paths = /data/${LIB}:/data/other/${LIB}
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# Permitted path
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namespace.default.permitted.paths = /system/${LIB}
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# ... asan
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namespace.default.asan.permitted.paths = /data/${LIB}
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# This declares linked namespaces - comma separated list.
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namespace.default.links = ns1
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# For every link define list of shared libraries. This is list of the libraries accessilbe from
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# default namespace but loaded in the linked namespace.
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namespace.default.link.ns1.shared_libs = libexternal.so:libother.so
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# This part defines config for ns1
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namespace.ns1.isolated = true
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namespace.ns1.search.paths = /vendor/${LIB}
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namespace.ns1.asan.search.paths = /data/vendor/${LIB}
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namespace.ns1.permitted.paths = /vendor/${LIB}
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namespace.ns1.asan.permitted.paths = /data/vendor/${LIB}
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# and links it to default namespace
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namespace.ns.links = default
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namespace.ns.link.default.shared_libs = libc.so:libdl.so:libm.so:libstdc++.so
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```
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