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DynamicLoader: Fix master and initial TLS setup

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Bananymous
2026-07-20 04:07:23 +03:00
parent 390a7674b1
commit 0242a4f968
1 changed files with 26 additions and 33 deletions
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userspace/programs/DynamicLoader/main.cpp
+26 -33
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@@ -152,7 +152,6 @@ struct LoadedElf
ElfNativeProgramHeader tls_header;
ElfNativeDynamic* dynamics;
uint8_t* tls_addr;
size_t tls_module;
size_t tls_offset;
@@ -659,21 +658,21 @@ static void relocate_elf(LoadedElf& elf, bool lazy_load)
relocate_elf(*reinterpret_cast<LoadedElf*>(dynamic.d_un.d_ptr), lazy_load);
}
// do "normal" relocations
// do mandatory relocations
if (elf.rel && elf.relent)
{
for (size_t i = 0; i < elf.relsz / elf.relent; i++)
handle_relocation(elf, *reinterpret_cast<ElfNativeRelocation*>(elf.rel + i * elf.relent), true);
if (elf.rela && elf.relaent)
for (size_t i = 0; i < elf.relasz / elf.relaent; i++)
handle_relocation(elf, *reinterpret_cast<ElfNativeRelocationA*>(elf.rela + i * elf.relaent), true);
// do tls relocations
if (elf.rel && elf.relent)
for (size_t i = 0; i < elf.relsz / elf.relent; i++)
handle_tls_relocation(elf, *reinterpret_cast<ElfNativeRelocation*>(elf.rel + i * elf.relent));
}
if (elf.rela && elf.relaent)
{
for (size_t i = 0; i < elf.relasz / elf.relaent; i++)
handle_relocation(elf, *reinterpret_cast<ElfNativeRelocationA*>(elf.rela + i * elf.relaent), true);
for (size_t i = 0; i < elf.relasz / elf.relaent; i++)
handle_tls_relocation(elf, *reinterpret_cast<ElfNativeRelocationA*>(elf.rela + i * elf.relaent));
}
// do jumprel relocations
if (elf.jmprel && elf.pltrelsz)
@@ -1226,7 +1225,6 @@ static MasterTLS initialize_tls_stage1()
size_t max_align = alignof(uthread);
size_t tls_m_offset = 0;
size_t tls_m_size = 0;
size_t module_count = 0;
for (size_t i = 0; i < s_loaded_file_count; i++)
{
@@ -1238,7 +1236,6 @@ static MasterTLS initialize_tls_stage1()
max_align = max<size_t>(max_align, tls_header.p_align);
tls_m_offset = round(tls_m_offset + tls_header.p_memsz, tls_header.p_align);
tls_m_size = tls_header.p_memsz;
module_count++;
}
@@ -1246,7 +1243,7 @@ static MasterTLS initialize_tls_stage1()
if (module_count == 0)
return { .addr = nullptr, .size = 0, .module_count = 0 };
size_t master_tls_size = tls_m_offset + tls_m_size;
size_t master_tls_size = tls_m_offset;
if (auto rem = master_tls_size % max_align)
master_tls_size += max_align - rem;
@@ -1268,7 +1265,8 @@ static MasterTLS initialize_tls_stage1()
master_tls_addr = reinterpret_cast<uint8_t*>(ret);
}
for (size_t i = 0, tls_offset = 0; i < s_loaded_file_count; i++)
size_t tls_offset = 0;
for (size_t i = 0; i < s_loaded_file_count; i++)
{
const auto& tls_header = s_loaded_files[i].tls_header;
if (tls_header.p_type != PT_TLS)
@@ -1277,7 +1275,6 @@ static MasterTLS initialize_tls_stage1()
tls_offset = round(tls_offset + tls_header.p_memsz, tls_header.p_align);
auto& elf = s_loaded_files[i];
elf.tls_addr = master_tls_addr + master_tls_size - tls_offset;
elf.tls_module = s_tls_module++;
elf.tls_offset = tls_offset;
}
@@ -1312,17 +1309,15 @@ static void allocate_dynamic_tls()
};
}
static void initialize_tls_memory()
static void initialize_master_tls_data(MasterTLS master_tls)
{
for (size_t i = 0; i < s_loaded_file_count; i++)
{
const auto& tls_header = s_loaded_files[i].tls_header;
if (tls_header.p_type != PT_TLS)
continue;
auto& elf = s_loaded_files[i];
memcpy(elf.tls_addr, reinterpret_cast<void*>(tls_header.p_vaddr), tls_header.p_filesz);
memset(elf.tls_addr + tls_header.p_filesz, 0, tls_header.p_memsz - tls_header.p_filesz);
uint8_t* master_addr = master_tls.addr + master_tls.size - s_loaded_files[i].tls_offset;
memcpy(master_addr, reinterpret_cast<void*>(tls_header.p_vaddr), tls_header.p_filesz);
}
}
@@ -1330,16 +1325,14 @@ static void initialize_tls_stage2(MasterTLS master_tls)
{
allocate_dynamic_tls();
initialize_tls_memory();
const size_t tls_size = master_tls.size + sizeof(uthread);
initialize_master_tls_data(master_tls);
uint8_t* tls_addr;
{
const sys_mmap_t mmap_args {
.addr = nullptr,
.len = tls_size,
.len = master_tls.size + sizeof(uthread),
.prot = PROT_READ | PROT_WRITE,
.flags = MAP_ANONYMOUS | MAP_PRIVATE,
.fildes = -1,
@@ -1348,14 +1341,11 @@ static void initialize_tls_stage2(MasterTLS master_tls)
const auto ret = syscall(SYS_MMAP, &mmap_args);
if (ret < 0)
print_error_and_exit("failed to allocate master TLS", ret);
print_error_and_exit("failed to allocate TLS", ret);
tls_addr = reinterpret_cast<uint8_t*>(ret);
}
memcpy(tls_addr, master_tls.addr, master_tls.size);
uthread& uthread = *reinterpret_cast<struct uthread*>(tls_addr + master_tls.size);
memset(&uthread, 0, sizeof(uthread));
uthread.self = &uthread;
uthread.master_tls_addr = master_tls.addr,
@@ -1375,9 +1365,11 @@ static void initialize_tls_stage2(MasterTLS master_tls)
for (size_t i = 0; i < s_loaded_file_count; i++)
{
const auto& elf = s_loaded_files[i];
if (elf.tls_addr == nullptr)
if (elf.tls_header.p_type != PT_TLS)
continue;
uthread.dtv[elf.tls_module] = reinterpret_cast<uintptr_t>(tls_addr) + uthread.master_tls_size - elf.tls_offset;
const ptrdiff_t offset = master_tls.size - elf.tls_offset;
memcpy(tls_addr + offset, master_tls.addr + offset, elf.tls_header.p_filesz);
uthread.dtv[elf.tls_module] = reinterpret_cast<uintptr_t>(tls_addr + offset);
}
#if defined(__x86_64__)
@@ -1504,6 +1496,8 @@ static void register_fini_funcs(LoadedElf& elf, bool is_main_elf)
static void load_dynamic_tls(LoadedElf& elf)
{
uint8_t* tls_addr;
{
const sys_mmap_t mmap_args {
.addr = nullptr,
@@ -1517,12 +1511,11 @@ static void load_dynamic_tls(LoadedElf& elf)
const auto ret = syscall(SYS_MMAP, &mmap_args);
if (ret < 0)
print_error_and_exit("failed to allocate dynamic TLS", ret);
elf.tls_addr = reinterpret_cast<uint8_t*>(ret);
memcpy(elf.tls_addr, reinterpret_cast<void*>(elf.tls_header.p_vaddr), elf.tls_header.p_filesz);
memset(elf.tls_addr + elf.tls_header.p_filesz, 0, elf.tls_header.p_memsz - elf.tls_header.p_filesz);
tls_addr = reinterpret_cast<uint8_t*>(ret);
}
memcpy(tls_addr, reinterpret_cast<void*>(elf.tls_header.p_vaddr), elf.tls_header.p_filesz);
int expected = 0;
while (!BAN::atomic_compare_exchange(s_dynamic_tls->lock, expected, 1))
{
@@ -1531,7 +1524,7 @@ static void load_dynamic_tls(LoadedElf& elf)
}
s_dynamic_tls->entries[s_dynamic_tls->entry_count++] = {
.master_addr = elf.tls_addr,
.master_addr = tls_addr,
.master_size = elf.tls_header.p_memsz,
};