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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* ipa_module.cpp - Image Processing Algorithm module
*/
#include "ipa_module.h"
#include <algorithm>
#include <array>
#include <dlfcn.h>
#include <elf.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <tuple>
#include <unistd.h>
#include "log.h"
#include "pipeline_handler.h"
#include "utils.h"
/**
* \file ipa_module.h
* \brief Image Processing Algorithm module
*/
/**
* \file ipa_module_info.h
* \brief Image Processing Algorithm module information
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAModule)
namespace {
template<typename T>
typename std::remove_extent<T>::type *elfPointer(void *map, off_t offset,
size_t fileSize, size_t objSize)
{
size_t size = offset + objSize;
if (size > fileSize || size < objSize)
return nullptr;
return reinterpret_cast<typename std::remove_extent<T>::type *>
(static_cast<char *>(map) + offset);
}
template<typename T>
typename std::remove_extent<T>::type *elfPointer(void *map, off_t offset,
size_t fileSize)
{
return elfPointer<T>(map, offset, fileSize, sizeof(T));
}
int elfVerifyIdent(void *map, size_t soSize)
{
char *e_ident = elfPointer<char[EI_NIDENT]>(map, 0, soSize);
if (!e_ident)
return -ENOEXEC;
if (e_ident[EI_MAG0] != ELFMAG0 ||
e_ident[EI_MAG1] != ELFMAG1 ||
e_ident[EI_MAG2] != ELFMAG2 ||
e_ident[EI_MAG3] != ELFMAG3 ||
e_ident[EI_VERSION] != EV_CURRENT)
return -ENOEXEC;
int bitClass = sizeof(unsigned long) == 4 ? ELFCLASS32 : ELFCLASS64;
if (e_ident[EI_CLASS] != bitClass)
return -ENOEXEC;
int a = 1;
unsigned char endianness = *reinterpret_cast<char *>(&a) == 1
? ELFDATA2LSB : ELFDATA2MSB;
if (e_ident[EI_DATA] != endianness)
return -ENOEXEC;
return 0;
}
/**
* \brief Retrieve address and size of a symbol from an mmap'ed ELF file
* \param[in] map Address of mmap'ed ELF file
* \param[in] soSize Size of mmap'ed ELF file (in bytes)
* \param[in] symbol Symbol name
*
* \return zero or error code, address or nullptr, size of symbol or zero,
* respectively
*/
template<class ElfHeader, class SecHeader, class SymHeader>
std::tuple<void *, size_t>
elfLoadSymbol(void *map, size_t soSize, const char *symbol)
{
ElfHeader *eHdr = elfPointer<ElfHeader>(map, 0, soSize);
if (!eHdr)
return std::make_tuple(nullptr, 0);
off_t offset = eHdr->e_shoff + eHdr->e_shentsize * eHdr->e_shstrndx;
SecHeader *sHdr = elfPointer<SecHeader>(map, offset, soSize);
if (!sHdr)
return std::make_tuple(nullptr, 0);
off_t shnameoff = sHdr->sh_offset;
/* Locate .dynsym section header. */
SecHeader *dynsym = nullptr;
for (unsigned int i = 0; i < eHdr->e_shnum; i++) {
offset = eHdr->e_shoff + eHdr->e_shentsize * i;
sHdr = elfPointer<SecHeader>(map, offset, soSize);
if (!sHdr)
return std::make_tuple(nullptr, 0);
offset = shnameoff + sHdr->sh_name;
char *name = elfPointer<char[8]>(map, offset, soSize);
if (!name)
return std::make_tuple(nullptr, 0);
if (sHdr->sh_type == SHT_DYNSYM && !strcmp(name, ".dynsym")) {
dynsym = sHdr;
break;
}
}
if (dynsym == nullptr) {
LOG(IPAModule, Error) << "ELF has no .dynsym section";
return std::make_tuple(nullptr, 0);
}
offset = eHdr->e_shoff + eHdr->e_shentsize * dynsym->sh_link;
sHdr = elfPointer<SecHeader>(map, offset, soSize);
if (!sHdr)
return std::make_tuple(nullptr, 0);
off_t dynsym_nameoff = sHdr->sh_offset;
/* Locate symbol in the .dynsym section. */
SymHeader *targetSymbol = nullptr;
unsigned int dynsym_num = dynsym->sh_size / dynsym->sh_entsize;
for (unsigned int i = 0; i < dynsym_num; i++) {
offset = dynsym->sh_offset + dynsym->sh_entsize * i;
SymHeader *sym = elfPointer<SymHeader>(map, offset, soSize);
if (!sym)
return std::make_tuple(nullptr, 0);
offset = dynsym_nameoff + sym->st_name;
char *name = elfPointer<char>(map, offset, soSize,
strlen(symbol) + 1);
if (!name)
return std::make_tuple(nullptr, 0);
if (!strcmp(name, symbol) &&
sym->st_info & STB_GLOBAL) {
targetSymbol = sym;
break;
}
}
if (targetSymbol == nullptr) {
LOG(IPAModule, Error) << "Symbol " << symbol << " not found";
return std::make_tuple(nullptr, 0);
}
/* Locate and return data of symbol. */
if (targetSymbol->st_shndx >= eHdr->e_shnum)
return std::make_tuple(nullptr, 0);
offset = eHdr->e_shoff + targetSymbol->st_shndx * eHdr->e_shentsize;
sHdr = elfPointer<SecHeader>(map, offset, soSize);
if (!sHdr)
return std::make_tuple(nullptr, 0);
offset = sHdr->sh_offset + (targetSymbol->st_value - sHdr->sh_addr);
char *data = elfPointer<char>(map, offset, soSize, targetSymbol->st_size);
if (!data)
return std::make_tuple(nullptr, 0);
return std::make_tuple(data, targetSymbol->st_size);
}
} /* namespace */
/**
* \def IPA_MODULE_API_VERSION
* \brief The IPA module API version
*
* This version number specifies the version for the layout of
* struct IPAModuleInfo. The IPA module shall use this macro to
* set its moduleAPIVersion field.
*
* \sa IPAModuleInfo::moduleAPIVersion
*/
/**
* \struct IPAModuleInfo
* \brief Information of an IPA module
*
* This structure contains the information of an IPA module. It is loaded,
* read, and validated before anything else is loaded from the shared object.
*
* \var IPAModuleInfo::moduleAPIVersion
* \brief The IPA module API version that the IPA module implements
*
* This version number specifies the version for the layout of
* struct IPAModuleInfo. The IPA module shall report here the version that
* it was built for, using the macro IPA_MODULE_API_VERSION.
*
* \var IPAModuleInfo::pipelineVersion
* \brief The pipeline handler version that the IPA module is for
*
* \var IPAModuleInfo::pipelineName
* \brief The name of the pipeline handler that the IPA module is for
*
* This name is used to match a pipeline handler with the module.
*
* \var IPAModuleInfo::name
* \brief The name of the IPA module
*
* \var IPAModuleInfo::license
* \brief License of the IPA module
*
* This license is used to determine whether to force isolation of the IPA in
* a separate process. If the license is "Proprietary", then the IPA will
* be isolated. If the license is open-source, then the IPA will be allowed to
* run without isolation if the user enables it. The license should be an
* SPDX license string. The following licenses are currently available to
* allow the IPA to run unisolated:
*
* - GPL-2.0-only
* - GPL-2.0-or-later
* - GPL-3.0-only
* - GPL-3.0-or-later
* - LGPL-2.1-only
* - LGPL-2.1-or-later
* - LGPL-3.0-only
* - LGPL-3.0-or-later
*
* Any other license will cause the IPA to be run isolated.
*
* \todo Allow user to choose to isolate open source IPAs
*/
/**
* \var ipaModuleInfo
* \brief Information of an IPA module
*
* An IPA module must export a struct IPAModuleInfo of this name.
*/
/**
* \class IPAModule
* \brief Wrapper around IPA module shared object
*/
/**
* \brief Construct an IPAModule instance
* \param[in] libPath path to IPA module shared object
*
* Loads the IPAModuleInfo from the IPA module shared object at libPath.
* The IPA module shared object file must be of the same endianness and
* bitness as libcamera.
*
* The caller shall call the isValid() method after constructing an
* IPAModule instance to verify the validity of the IPAModule.
*/
IPAModule::IPAModule(const std::string &libPath)
: libPath_(libPath), valid_(false), loaded_(false),
dlHandle_(nullptr), ipaCreate_(nullptr)
{
if (loadIPAModuleInfo() < 0)
return;
valid_ = true;
}
IPAModule::~IPAModule()
{
if (dlHandle_)
dlclose(dlHandle_);
}
int IPAModule::loadIPAModuleInfo()
{
int fd = open(libPath_.c_str(), O_RDONLY);
if (fd < 0) {
int ret = -errno;
LOG(IPAModule, Error) << "Failed to open IPA library: "
<< strerror(-ret);
return ret;
}
void *data = nullptr;
size_t dataSize;
void *map;
size_t soSize;
struct stat st;
int ret = fstat(fd, &st);
if (ret < 0)
goto close;
soSize = st.st_size;
map = mmap(NULL, soSize, PROT_READ, MAP_PRIVATE, fd, 0);
if (map == MAP_FAILED) {
ret = -errno;
goto close;
}
ret = elfVerifyIdent(map, soSize);
if (ret)
goto unmap;
if (sizeof(unsigned long) == 4)
std::tie(data, dataSize) =
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