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LibELF: Mark libc.so and libpthread.so as syscall regions

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Also, before calling the main program entry function, inform the kernel
that no more syscall regions can be registered.

This effectively bans syscalls from everywhere except LibC and
LibPthread. Pretty neat! :^)
This commit is contained in:
Andreas Kling 2021-02-02 19:59:15 +01:00
parent 47d0ca85e8
commit df7ddfb803
Notes: sideshowbarker 2024-07-18 22:37:32 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/df7ddfb8035
1 changed files with 16 additions and 1 deletions
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17
Userland/Libraries/LibELF/DynamicLinker.cpp
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@ -31,6 +31,7 @@
#include <AK/LexicalPath.h>
#include <AK/LogStream.h>
#include <AK/ScopeGuard.h>
#include <Kernel/API/Syscall.h>
#include <LibC/mman.h>
#include <LibC/stdio.h>
#include <LibC/sys/internals.h>
@ -214,6 +215,14 @@ static NonnullRefPtr<DynamicLoader> commit_elf(const String& name)
auto object = loader->load_stage_3(RTLD_GLOBAL | RTLD_LAZY, g_total_tls_size);
ASSERT(object);
if (name.is_one_of("libc.so", "libpthread.so")) {
if (syscall(SC_msyscall, object->base_address().as_ptr())) {
ASSERT_NOT_REACHED();
}
}
if (name == "libc.so") {
initialize_libc(*object);
}
@ -263,7 +272,13 @@ void ELF::DynamicLinker::linker_main(String&& main_program_name, int main_progra
if (g_do_breakpoint_trap_before_entry) {
asm("int3");
}
int rc = main_function(argc, argv, envp);
int rc = syscall(SC_msyscall, nullptr);
if (rc < 0) {
ASSERT_NOT_REACHED();
}
rc = main_function(argc, argv, envp);
dbgln<DYNAMIC_LOAD_DEBUG>("rc: {}", rc);
if (g_libc_exit != nullptr) {
g_libc_exit(rc);