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LibELF: Split the DynamicLoader's loading mechanism into two steps

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load_from_image() becomes map() and link(). This allows us to map
an object before mapping its dependencies.

This solves an issue where fixed-position executables (like GCC)
would clash with the ASLR placement of their own shared libraries.
This commit is contained in:
Andreas Kling 2021-01-31 11:46:00 +01:00
parent 36525c0572
commit e313323317
4 changed files with 19 additions and 13 deletions
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8
Userland/Libraries/LibELF/DynamicLinker.cpp
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@ -181,6 +181,10 @@ static void load_elf(const String& name)
{
dbgln<DYNAMIC_LOAD_DEBUG>("load_elf: {}", name);
auto loader = g_loaders.get(name).value();
auto dynamic_object = loader->map();
ASSERT(dynamic_object);
for (const auto& needed_name : get_dependencies(name)) {
dbgln<DYNAMIC_LOAD_DEBUG>("needed library: {}", needed_name);
String library_name = get_library_name(needed_name);
@ -189,8 +193,8 @@ static void load_elf(const String& name)
}
}
auto dynamic_object = loader->load_from_image(RTLD_GLOBAL | RTLD_LAZY, g_total_tls_size);
ASSERT(dynamic_object);
bool success = loader->link(RTLD_GLOBAL | RTLD_LAZY, g_total_tls_size);
ASSERT(success);
g_loaded_objects.set(name, *dynamic_object);
g_global_objects.append(*dynamic_object);