mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-13 11:42:38 +03:00
c8d9f1b9c9
Since the CPU already does almost all necessary validation steps for us, we don't really need to attempt to do this. Doing it ourselves doesn't really work very reliably, because we'd have to account for other processors modifying virtual memory, and we'd have to account for e.g. pages not being able to be allocated due to insufficient resources. So change the copy_to/from_user (and associated helper functions) to use the new safe_memcpy, which will return whether it succeeded or not. The only manual validation step needed (which the CPU can't perform for us) is making sure the pointers provided by user mode aren't pointing to kernel mappings. To make it easier to read/write from/to either kernel or user mode data add the UserOrKernelBuffer helper class, which will internally either use copy_from/to_user or directly memcpy, or pass the data through directly using a temporary buffer on the stack. Last but not least we need to keep syscall params trivial as we need to copy them from/to user mode using copy_from/to_user.
188 lines
7.5 KiB
C++
188 lines
7.5 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <Kernel/FileSystem/FileDescription.h>
|
|
#include <Kernel/FileSystem/VirtualFileSystem.h>
|
|
#include <Kernel/KSyms.h>
|
|
#include <Kernel/Module.h>
|
|
#include <Kernel/Process.h>
|
|
#include <LibELF/Loader.h>
|
|
|
|
namespace Kernel {
|
|
|
|
extern HashMap<String, OwnPtr<Module>>* g_modules;
|
|
|
|
int Process::sys$module_load(Userspace<const char*> user_path, size_t path_length)
|
|
{
|
|
if (!is_superuser())
|
|
return -EPERM;
|
|
|
|
REQUIRE_NO_PROMISES;
|
|
|
|
auto path = get_syscall_path_argument(user_path, path_length);
|
|
if (path.is_error())
|
|
return path.error();
|
|
auto description_or_error = VFS::the().open(path.value(), O_RDONLY, 0, current_directory());
|
|
if (description_or_error.is_error())
|
|
return description_or_error.error();
|
|
auto& description = description_or_error.value();
|
|
auto payload_or_error = description->read_entire_file();
|
|
if (payload_or_error.is_error())
|
|
return payload_or_error.error();
|
|
|
|
auto payload = payload_or_error.value();
|
|
auto storage = KBuffer::create_with_size(payload.size());
|
|
memcpy(storage.data(), payload.data(), payload.size());
|
|
|
|
auto elf_image = make<ELF::Image>(storage.data(), storage.size());
|
|
if (!elf_image->parse())
|
|
return -ENOEXEC;
|
|
|
|
HashMap<String, u8*> section_storage_by_name;
|
|
|
|
auto module = make<Module>();
|
|
|
|
elf_image->for_each_section_of_type(SHT_PROGBITS, [&](const ELF::Image::Section& section) {
|
|
if (!section.size())
|
|
return IterationDecision::Continue;
|
|
auto section_storage = KBuffer::copy(section.raw_data(), section.size(), Region::Access::Read | Region::Access::Write | Region::Access::Execute);
|
|
section_storage_by_name.set(section.name(), section_storage.data());
|
|
module->sections.append(move(section_storage));
|
|
return IterationDecision::Continue;
|
|
});
|
|
|
|
bool missing_symbols = false;
|
|
|
|
elf_image->for_each_section_of_type(SHT_PROGBITS, [&](const ELF::Image::Section& section) {
|
|
if (!section.size())
|
|
return IterationDecision::Continue;
|
|
auto* section_storage = section_storage_by_name.get(section.name()).value_or(nullptr);
|
|
ASSERT(section_storage);
|
|
section.relocations().for_each_relocation([&](const ELF::Image::Relocation& relocation) {
|
|
auto& patch_ptr = *reinterpret_cast<ptrdiff_t*>(section_storage + relocation.offset());
|
|
switch (relocation.type()) {
|
|
case R_386_PC32: {
|
|
// PC-relative relocation
|
|
dbg() << "PC-relative relocation: " << relocation.symbol().name();
|
|
u32 symbol_address = address_for_kernel_symbol(relocation.symbol().name());
|
|
if (symbol_address == 0)
|
|
missing_symbols = true;
|
|
dbg() << " Symbol address: " << (void*)symbol_address;
|
|
ptrdiff_t relative_offset = (char*)symbol_address - ((char*)&patch_ptr + 4);
|
|
patch_ptr = relative_offset;
|
|
break;
|
|
}
|
|
case R_386_32: // Absolute relocation
|
|
dbg() << "Absolute relocation: '" << relocation.symbol().name() << "' value:" << relocation.symbol().value() << ", index:" << relocation.symbol_index();
|
|
|
|
if (relocation.symbol().bind() == STB_LOCAL) {
|
|
auto* section_storage_containing_symbol = section_storage_by_name.get(relocation.symbol().section().name()).value_or(nullptr);
|
|
ASSERT(section_storage_containing_symbol);
|
|
u32 symbol_address = (ptrdiff_t)(section_storage_containing_symbol + relocation.symbol().value());
|
|
if (symbol_address == 0)
|
|
missing_symbols = true;
|
|
dbg() << " Symbol address: " << (void*)symbol_address;
|
|
patch_ptr += symbol_address;
|
|
} else if (relocation.symbol().bind() == STB_GLOBAL) {
|
|
u32 symbol_address = address_for_kernel_symbol(relocation.symbol().name());
|
|
if (symbol_address == 0)
|
|
missing_symbols = true;
|
|
dbg() << " Symbol address: " << (void*)symbol_address;
|
|
patch_ptr += symbol_address;
|
|
} else {
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
break;
|
|
}
|
|
return IterationDecision::Continue;
|
|
});
|
|
|
|
return IterationDecision::Continue;
|
|
});
|
|
|
|
if (missing_symbols)
|
|
return -EINVAL;
|
|
|
|
auto* text_base = section_storage_by_name.get(".text").value_or(nullptr);
|
|
if (!text_base) {
|
|
dbg() << "No .text section found in module!";
|
|
return -EINVAL;
|
|
}
|
|
|
|
elf_image->for_each_symbol([&](const ELF::Image::Symbol& symbol) {
|
|
dbg() << " - " << symbol.type() << " '" << symbol.name() << "' @ " << (void*)symbol.value() << ", size=" << symbol.size();
|
|
if (symbol.name() == "module_init") {
|
|
module->module_init = (ModuleInitPtr)(text_base + symbol.value());
|
|
} else if (symbol.name() == "module_fini") {
|
|
module->module_fini = (ModuleFiniPtr)(text_base + symbol.value());
|
|
} else if (symbol.name() == "module_name") {
|
|
const u8* storage = section_storage_by_name.get(symbol.section().name()).value_or(nullptr);
|
|
if (storage)
|
|
module->name = String((const char*)(storage + symbol.value()));
|
|
}
|
|
return IterationDecision::Continue;
|
|
});
|
|
|
|
if (!module->module_init)
|
|
return -EINVAL;
|
|
|
|
if (g_modules->contains(module->name)) {
|
|
dbg() << "a module with the name " << module->name << " is already loaded; please unload it first";
|
|
return -EEXIST;
|
|
}
|
|
|
|
module->module_init();
|
|
|
|
auto name = module->name;
|
|
g_modules->set(name, move(module));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int Process::sys$module_unload(Userspace<const char*> user_name, size_t name_length)
|
|
{
|
|
if (!is_superuser())
|
|
return -EPERM;
|
|
|
|
REQUIRE_NO_PROMISES;
|
|
|
|
auto module_name = copy_string_from_user(user_name, name_length);
|
|
if (module_name.is_null())
|
|
return -EFAULT;
|
|
|
|
auto it = g_modules->find(module_name);
|
|
if (it == g_modules->end())
|
|
return -ENOENT;
|
|
|
|
if (it->value->module_fini)
|
|
it->value->module_fini();
|
|
|
|
g_modules->remove(it);
|
|
return 0;
|
|
}
|
|
|
|
}
|