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Merge pull request #32234 from poettering/dlopen-name-elf-note
Expose dlopen() dependencies in an ELF section, and add spec for it
This commit is contained in:
Luca Boccassi
GitHub
commit
344ededcea
89
docs/ELF_DLOPEN_METADATA.md
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89
docs/ELF_DLOPEN_METADATA.md
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@ -0,0 +1,89 @@
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---
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title: Dlopen Metadata for ELF Files
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category: Interfaces
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layout: default
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SPDX-License-Identifier: LGPL-2.1-or-later
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---
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# `dlopen()` Metadata for ELF Files
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*Intended audience: hackers working on packaging ELF files that use dlopen to load libraries.*
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## Motivation
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Using `dlopen()` to load optional dependencies brings several advantages: programs can gracefully downgrade
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a feature when a library is not available, and the shared library is only loaded into the process (and its
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ELF constructors are run) only when the requested feature is actually used. But it also has some drawbacks,
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and the main one is that it is harder to track a program's dependencies, since unlike build-time dynamic
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linking there will not be a mention in the ELF metadata. This specification aims to solve this problem by
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providing a standardized specification for a custom ELF note that can be used to list `dlopen()`
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dependencies.
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## Implementation
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This document will attempt to define a common metadata format specification, so that multiple implementers
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might use it when coding upstream software, and packagers might use it when building packages and setting
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dependencies.
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The metadata will be embedded in a series of new, 4-byte-aligned, allocated, 0-padded, read-only ELF header
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sections, in a JSON array containing name-value objects, either one ELF note per dependency or as a single
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note listing multiple dependencies in the top-level array. Implementers working on parsing ELF files should
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not assume a specific list of names, but parse anything that is included in the section, and should look for
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the note using the `note type`. Implementers working on build tools should strive to use the same names, for
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consistency. The most common will be listed here.
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* Section header
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```
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SECTION: `.note.dlopen`
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note type: `0x407c0c0a`
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Owner: `FDO` (FreeDesktop.org)
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Value: an array of JSON objects encoded as a zero-terminated UTF-8 string
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```
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* JSON payload
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```json
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[
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{
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"soname": ["libfoo.so.1"],
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"feature": "foo",
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"description": "Enables the foo feature",
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"priority": "recommended"
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}
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]
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```
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The format is a single JSON array containing objects, encoded as a zero-terminated `UTF-8` string. Each key
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in each object shall be unique as per recommendations of [RFC8259](https://datatracker.ietf.org/doc/html/rfc8259#section-4).
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Strings shall not contain any control characters or use `\uXXX` escaping.
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Reference implementations of [packaging tools for `.deb` and `.rpm`](https://github.com/systemd/package-notes)
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are available, and provide macros/helpers to parse the note when building packages and adding dependencies.
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## Well-known keys
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The metadata format is intentionally extensible, so that upstreams and later revisions of this spec can add
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their own information. The 'soname' array is required, with at least one element, everything else is
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optional. If alternative soname versions for the same library are supported at the same time, an array can
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be used, listing the most preferred first, and parsers are expected to select only the first one that is
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available on the system, as it is a mechanism to specify alternatives. If the `priority` field is used, it
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must follow the specification and use one of the values specified in the table. If it is not specified, a
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parser should assume 'recommended' if a priority is needed. If the `feature` field is used, it will identify
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an individual feature, and multiple entries using the same `feature` denote functionality that requires all
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of the libraries they specify in order to be enabled.
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| Key name | Key type | Mandatory | Key description | Example value |
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|-------------|----------------------------|-----------|--------------------------------------------------------------------------|----------------------------------|
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| soname | array of strings | yes | The library names loaded by `dlopen()` | [ "libfoo.so.1", "libfoo.so.0" ] |
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| feature | string | no | A keyword identifying the feature that the library contributes to enable | "foo" |
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| description | string | no | A human-readable text string describing the feature | "Enables the foo feature" |
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| priority | string | no | The priority of the feature, one of: required, recommended, suggested | "recommended" |
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### Priority definition
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| Priority | Semantics |
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|-------------|--------------------------------------------------------------------------------------------------------------------------------------|
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| required | Core functionality needs the dependency, the binary will not work if it cannot be found |
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| recommended | Important functionality needs the dependency, the binary will work but in most cases the dependency should be provided |
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| suggested | Secondary functionality needs the dependency, the binary will work and the dependency is only needed for full-featured installations |
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@ -1418,6 +1418,15 @@ elif compression == 'lz4' and not liblz4.found()
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elif compression == 'xz' and not libxz.found()
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error('default-compression=xz requires xz')
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endif
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# In the dlopen ELF note we save the default compression library with a
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# higher priority, so that packages can give it priority over the
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# secondary libraries.
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conf.set_quoted('COMPRESSION_PRIORITY_ZSTD',
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compression == 'zstd' ? 'recommended' : 'suggested')
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conf.set_quoted('COMPRESSION_PRIORITY_LZ4',
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compression == 'lz4' ? 'recommended' : 'suggested')
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conf.set_quoted('COMPRESSION_PRIORITY_XZ',
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compression == 'xz' ? 'recommended' : 'suggested')
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conf.set('DEFAULT_COMPRESSION', 'COMPRESSION_@0@'.format(compression.to_upper()))
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libarchive = dependency('libarchive',
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@ -129,6 +129,11 @@ bool compression_supported(Compression c) {
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#if HAVE_XZ
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int dlopen_lzma(void) {
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ELF_NOTE_DLOPEN("lzma",
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"Support lzma compression in journal and coredump files",
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COMPRESSION_PRIORITY_XZ,
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"liblzma.so.5");
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return dlopen_many_sym_or_warn(
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&lzma_dl,
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"liblzma.so.5", LOG_DEBUG,
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@ -186,6 +191,11 @@ int compress_blob_xz(const void *src, uint64_t src_size,
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#if HAVE_LZ4
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int dlopen_lz4(void) {
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ELF_NOTE_DLOPEN("lz4",
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"Support lz4 compression in journal and coredump files",
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COMPRESSION_PRIORITY_LZ4,
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"liblz4.so.1");
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return dlopen_many_sym_or_warn(
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&lz4_dl,
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"liblz4.so.1", LOG_DEBUG,
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@ -242,6 +252,11 @@ int compress_blob_lz4(const void *src, uint64_t src_size,
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#if HAVE_ZSTD
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int dlopen_zstd(void) {
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ELF_NOTE_DLOPEN("zstd",
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"Support zstd compression in journal and coredump files",
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COMPRESSION_PRIORITY_ZSTD,
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"libzstd.so.1");
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return dlopen_many_sym_or_warn(
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&zstd_dl,
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"libzstd.so.1", LOG_DEBUG,
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@ -39,3 +39,44 @@ int dlopen_many_sym_or_warn_sentinel(void **dlp, const char *filename, int log_l
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/* libbpf is a bit confused about type-safety and API compatibility. Provide a macro that can tape over that mess. Sad. */
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#define DLSYM_ARG_FORCE(arg) \
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&sym_##arg, STRINGIFY(arg)
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#define ELF_NOTE_DLOPEN_VENDOR "FDO"
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#define ELF_NOTE_DLOPEN_TYPE UINT32_C(0x407c0c0a)
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#define ELF_NOTE_DLOPEN_PRIORITY_REQUIRED "required"
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#define ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED "recommended"
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#define ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED "suggested"
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/* Add an ".note.dlopen" ELF note to our binary that declares our weak dlopen() dependency. This
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* information can be read from an ELF file via "readelf -p .note.dlopen" or an equivalent command. */
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#define _ELF_NOTE_DLOPEN(json, variable_name) \
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__attribute__((used, section(".note.dlopen"))) _Alignas(sizeof(uint32_t)) static const struct { \
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struct { \
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uint32_t n_namesz, n_descsz, n_type; \
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} nhdr; \
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char name[sizeof(ELF_NOTE_DLOPEN_VENDOR)]; \
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_Alignas(sizeof(uint32_t)) char dlopen_json[sizeof(json)]; \
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} variable_name = { \
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.nhdr = { \
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.n_namesz = sizeof(ELF_NOTE_DLOPEN_VENDOR), \
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.n_descsz = sizeof(json), \
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.n_type = ELF_NOTE_DLOPEN_TYPE, \
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}, \
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.name = ELF_NOTE_DLOPEN_VENDOR, \
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.dlopen_json = json, \
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}
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#define _SONAME_ARRAY1(a) "[\""a"\"]"
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#define _SONAME_ARRAY2(a, b) "[\""a"\",\""b"\"]"
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#define _SONAME_ARRAY3(a, b, c) "[\""a"\",\""b"\",\""c"\"]"
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#define _SONAME_ARRAY4(a, b, c, d) "[\""a"\",\""b"\",\""c"\"",\""d"\"]"
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#define _SONAME_ARRAY5(a, b, c, d, e) "[\""a"\",\""b"\",\""c"\"",\""d"\",\""e"\"]"
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#define _SONAME_ARRAY_GET(_1,_2,_3,_4,_5,NAME,...) NAME
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#define _SONAME_ARRAY(...) _SONAME_ARRAY_GET(__VA_ARGS__, _SONAME_ARRAY5, _SONAME_ARRAY4, _SONAME_ARRAY3, _SONAME_ARRAY2, _SONAME_ARRAY1)(__VA_ARGS__)
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/* The 'priority' must be one of 'required', 'recommended' or 'suggested' as per specification, use the
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* macro defined above to specify it.
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* Multiple sonames can be passed and they will be automatically contructed into a json array (but note that
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* due to preprocessor language limitations if more than the limit defined above is used, a new
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* _SONAME_ARRAY<X+1> will need to be added). */
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#define ELF_NOTE_DLOPEN(feature, description, priority, ...) \
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_ELF_NOTE_DLOPEN("[{\"feature\":\"" feature "\",\"description\":\"" description "\",\"priority\":\"" priority "\",\"soname\":" _SONAME_ARRAY(__VA_ARGS__) "}]", UNIQ_T(s, UNIQ))
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@ -41,6 +41,11 @@ DLSYM_FUNCTION(gcry_randomize);
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DLSYM_FUNCTION(gcry_strerror);
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static int dlopen_gcrypt(void) {
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ELF_NOTE_DLOPEN("gcrypt",
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"Support for journald forward-sealing",
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ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
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"libgcrypt.so.20");
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return dlopen_many_sym_or_warn(
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&gcrypt_dl,
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"libgcrypt.so.20", LOG_DEBUG,
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@ -16,6 +16,10 @@ DLSYM_FUNCTION(xkb_keymap_new_from_names);
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DLSYM_FUNCTION(xkb_keymap_unref);
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static int dlopen_xkbcommon(void) {
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ELF_NOTE_DLOPEN("xkbcommon",
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"Support for keyboard locale descriptions",
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ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED, "libxkbcommon.so.0");
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return dlopen_many_sym_or_warn(
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&xkbcommon_dl, "libxkbcommon.so.0", LOG_DEBUG,
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DLSYM_ARG(xkb_context_new),
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@ -76,6 +76,11 @@ int dlopen_bpf(void) {
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void *dl;
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int r;
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ELF_NOTE_DLOPEN("bpf",
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"Support firewalling and sandboxing with BPF",
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ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
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"libbpf.so.1", "libbpf.so.0");
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DISABLE_WARNING_DEPRECATED_DECLARATIONS;
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dl = dlopen("libbpf.so.1", RTLD_LAZY);
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@ -252,6 +252,11 @@ int dlopen_cryptsetup(void) {
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DISABLE_WARNING_DEPRECATED_DECLARATIONS;
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ELF_NOTE_DLOPEN("cryptsetup",
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"Support for disk encryption, integrity, and authentication",
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ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
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"libcryptsetup.so.12");
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r = dlopen_many_sym_or_warn(
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&cryptsetup_dl, "libcryptsetup.so.12", LOG_DEBUG,
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DLSYM_ARG(crypt_activate_by_passphrase),
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@ -87,6 +87,11 @@ static DLSYM_FUNCTION(gelf_getnote);
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int dlopen_dw(void) {
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int r;
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ELF_NOTE_DLOPEN("dw",
|
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"Support for backtrace and ELF package metadata decoding from core files",
|
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ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
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"libdw.so.1");
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r = dlopen_many_sym_or_warn(
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&dw_dl, "libdw.so.1", LOG_DEBUG,
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DLSYM_ARG(dwarf_getscopes),
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@ -130,6 +135,11 @@ int dlopen_dw(void) {
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int dlopen_elf(void) {
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int r;
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|
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ELF_NOTE_DLOPEN("elf",
|
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"Support for backtraces and reading ELF package metadata from core files",
|
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ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
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"libelf.so.1");
|
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|
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r = dlopen_many_sym_or_warn(
|
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&elf_dl, "libelf.so.1", LOG_DEBUG,
|
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DLSYM_ARG(elf_begin),
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|
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@ -354,6 +354,11 @@ int fw_iptables_add_local_dnat(
|
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}
|
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|
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static int dlopen_iptc(void) {
|
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ELF_NOTE_DLOPEN("ip4tc",
|
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"Support for firewall rules",
|
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ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
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"libip4tc.so.2");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
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&iptc_dl,
|
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"libip4tc.so.2", LOG_DEBUG,
|
||||
|
||||
@ -21,6 +21,11 @@ const char *(*sym_idn2_strerror)(int rc) _const_ = NULL;
|
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DLSYM_FUNCTION(idn2_to_unicode_8z8z);
|
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|
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int dlopen_idn(void) {
|
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ELF_NOTE_DLOPEN("idn",
|
||||
"Support for internationalized domain names",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libidn2.so.0");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
||||
&idn_dl, "libidn2.so.0", LOG_DEBUG,
|
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DLSYM_ARG(idn2_lookup_u8),
|
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@ -39,6 +44,11 @@ int dlopen_idn(void) {
|
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_cleanup_(dlclosep) void *dl = NULL;
|
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int r;
|
||||
|
||||
ELF_NOTE_DLOPEN("idn",
|
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"Support for internationalized domain names",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
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"libidn.so.12", "libidn.so.11");
|
||||
|
||||
if (idn_dl)
|
||||
return 0; /* Already loaded */
|
||||
|
||||
|
||||
@ -30,6 +30,11 @@ DLSYM_FUNCTION(archive_write_set_format_filter_by_ext);
|
||||
DLSYM_FUNCTION(archive_write_set_format_gnutar);
|
||||
|
||||
int dlopen_libarchive(void) {
|
||||
ELF_NOTE_DLOPEN("archive",
|
||||
"Support for decompressing archive files",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libarchive.so.13");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
||||
&libarchive_dl,
|
||||
"libarchive.so.13",
|
||||
|
||||
@ -72,6 +72,11 @@ static void fido_log_propagate_handler(const char *s) {
|
||||
int dlopen_libfido2(void) {
|
||||
int r;
|
||||
|
||||
ELF_NOTE_DLOPEN("fido2",
|
||||
"Support fido2 for encryption and authentication",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libfido2.so.1");
|
||||
|
||||
r = dlopen_many_sym_or_warn(
|
||||
&libfido2_dl, "libfido2.so.1", LOG_DEBUG,
|
||||
DLSYM_ARG(fido_assert_allow_cred),
|
||||
|
||||
@ -25,6 +25,11 @@ DLSYM_FUNCTION(kmod_unref);
|
||||
DLSYM_FUNCTION(kmod_validate_resources);
|
||||
|
||||
int dlopen_libkmod(void) {
|
||||
ELF_NOTE_DLOPEN("kmod",
|
||||
"Support for loading kernel modules",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
|
||||
"libkmod.so.2");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
||||
&libkmod_dl,
|
||||
"libkmod.so.2",
|
||||
|
||||
@ -20,6 +20,11 @@ DLSYM_FUNCTION(passwdqc_check);
|
||||
DLSYM_FUNCTION(passwdqc_random);
|
||||
|
||||
int dlopen_passwdqc(void) {
|
||||
ELF_NOTE_DLOPEN("passwdqc",
|
||||
"Support for password quality checks",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libpasswdqc.so.1");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
||||
&passwdqc_dl, "libpasswdqc.so.1", LOG_DEBUG,
|
||||
DLSYM_ARG(passwdqc_params_reset),
|
||||
|
||||
@ -24,6 +24,11 @@ DLSYM_FUNCTION(pwquality_set_int_value);
|
||||
DLSYM_FUNCTION(pwquality_strerror);
|
||||
|
||||
int dlopen_pwquality(void) {
|
||||
ELF_NOTE_DLOPEN("pwquality",
|
||||
"Support for password quality checks",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libpwquality.so.1");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
||||
&pwquality_dl, "libpwquality.so.1", LOG_DEBUG,
|
||||
DLSYM_ARG(pwquality_check),
|
||||
|
||||
@ -27,6 +27,11 @@ const struct hash_ops pcre2_code_hash_ops_free = {};
|
||||
|
||||
int dlopen_pcre2(void) {
|
||||
#if HAVE_PCRE2
|
||||
ELF_NOTE_DLOPEN("pcre2",
|
||||
"Support for regular expressions",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libpcre2-8.so.0");
|
||||
|
||||
/* So here's something weird: PCRE2 actually renames the symbols exported by the library via C
|
||||
* macros, so that the exported symbols carry a suffix "_8" but when used from C the suffix is
|
||||
* gone. In the argument list below we ignore this mangling. Surprisingly (at least to me), we
|
||||
|
||||
@ -61,6 +61,11 @@ DLSYM_FUNCTION(p11_kit_uri_new);
|
||||
DLSYM_FUNCTION(p11_kit_uri_parse);
|
||||
|
||||
int dlopen_p11kit(void) {
|
||||
ELF_NOTE_DLOPEN("p11-kit",
|
||||
"Support for PKCS11 hardware tokens",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libp11-kit.so.0");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
||||
&p11kit_dl,
|
||||
"libp11-kit.so.0", LOG_DEBUG,
|
||||
|
||||
@ -24,6 +24,11 @@ static DLSYM_FUNCTION(QRcode_free);
|
||||
int dlopen_qrencode(void) {
|
||||
int r;
|
||||
|
||||
ELF_NOTE_DLOPEN("qrencode",
|
||||
"Support for generating QR codes",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libqrencode.so.4", "libqrencode.so.3");
|
||||
|
||||
FOREACH_STRING(s, "libqrencode.so.4", "libqrencode.so.3") {
|
||||
r = dlopen_many_sym_or_warn(
|
||||
&qrcode_dl, s, LOG_DEBUG,
|
||||
|
||||
@ -113,6 +113,11 @@ static DLSYM_FUNCTION(Tss2_RC_Decode);
|
||||
int dlopen_tpm2(void) {
|
||||
int r;
|
||||
|
||||
ELF_NOTE_DLOPEN("tpm",
|
||||
"Support for TPM",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libtss2-esys.so.0");
|
||||
|
||||
r = dlopen_many_sym_or_warn(
|
||||
&libtss2_esys_dl, "libtss2-esys.so.0", LOG_DEBUG,
|
||||
DLSYM_ARG(Esys_Create),
|
||||
@ -164,12 +169,22 @@ int dlopen_tpm2(void) {
|
||||
if (r < 0)
|
||||
log_debug("libtss2-esys too old, does not include Esys_TR_GetTpmHandle.");
|
||||
|
||||
ELF_NOTE_DLOPEN("tpm",
|
||||
"Support for TPM",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libtss2-rc.so.0");
|
||||
|
||||
r = dlopen_many_sym_or_warn(
|
||||
&libtss2_rc_dl, "libtss2-rc.so.0", LOG_DEBUG,
|
||||
DLSYM_ARG(Tss2_RC_Decode));
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
ELF_NOTE_DLOPEN("tpm",
|
||||
"Support for TPM",
|
||||
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
|
||||
"libtss2-mu.so.0");
|
||||
|
||||
return dlopen_many_sym_or_warn(
|
||||
&libtss2_mu_dl, "libtss2-mu.so.0", LOG_DEBUG,
|
||||
DLSYM_ARG(Tss2_MU_TPM2_CC_Marshal),
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user