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Add an entry point when signing Arm images #163

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merged 5 commits into from
Nov 21, 2024
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Merged

Add an entry point when signing Arm images #163

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09caa67
Add an entry point when signing Arm images
will-v-pi Nov 1, 2024
67d7434
Get vtor from 0x20000000 for SRAM binaries, and use rwd where present
will-v-pi Nov 19, 2024
7518601
Handle XIP_SRAM binaries with no vtor
will-v-pi Nov 20, 2024
b61244e
Use bin_start for vtor_loc for bins
will-v-pi Nov 20, 2024
c7edf5d
Only use rwd for flash binaries
will-v-pi Nov 21, 2024
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56 changes: 56 additions & 0 deletions main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4607,6 +4607,41 @@ void sign_guts_elf(elf_file* elf, private_t private_key, public_t public_key) {
new_block.items.push_back(version);
}

// Add entry point when signing Arm images
std::shared_ptr<image_type_item> image_type = new_block.get_item<image_type_item>();
if (settings.seal.sign && image_type != nullptr && image_type->image_type() == type_exe && image_type->cpu() == cpu_arm) {
std::shared_ptr<entry_point_item> entry_point = new_block.get_item<entry_point_item>();
if (entry_point == nullptr) {
std::shared_ptr<vector_table_item> vtor = new_block.get_item<vector_table_item>();
uint32_t vtor_loc = 0x10000000;
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if (vtor != nullptr) {
vtor_loc = vtor->addr;
} else {
if (elf->header().entry >= SRAM_START) {
vtor_loc = 0x20000000;
} else if (elf->header().entry >= XIP_SRAM_START_RP2350) {
vtor_loc = 0x13ffc000;
} else {
vtor_loc = 0x10000000;
std::shared_ptr<rolling_window_delta_item> rwd = new_block.get_item<rolling_window_delta_item>();
if (rwd != nullptr) {
vtor_loc += rwd->addr;
}
}
}
auto segment = elf->segment_from_physical_address(vtor_loc);
auto content = elf->content(*segment);
auto offset = vtor_loc - segment->physical_address();
uint32_t ep;
memcpy(&ep, content.data() + offset + 4, sizeof(ep));
uint32_t sp;
memcpy(&sp, content.data() + offset, sizeof(sp));
DEBUG_LOG("Adding entry_point_item: ep %08x, sp %08x\n", ep, sp);
entry_point = std::make_shared<entry_point_item>(ep, sp);
new_block.items.push_back(entry_point);
}
}

hash_andor_sign(
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Screenshot from 2024-11-19 23-27-37

😉

elf, &new_block, public_key, private_key,
settings.seal.hash, settings.seal.sign,
Expand Down Expand Up @@ -4643,6 +4678,27 @@ vector<uint8_t> sign_guts_bin(iostream_memory_access in, private_t private_key,
new_block.items.push_back(version);
}

// Add entry point when signing Arm images
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std::shared_ptr<image_type_item> image_type = new_block.get_item<image_type_item>();
if (settings.seal.sign && image_type != nullptr && image_type->image_type() == type_exe && image_type->cpu() == cpu_arm) {
std::shared_ptr<entry_point_item> entry_point = new_block.get_item<entry_point_item>();
if (entry_point == nullptr) {
std::shared_ptr<vector_table_item> vtor = new_block.get_item<vector_table_item>();
uint32_t vtor_loc = bin_start;
if (vtor != nullptr) {
vtor_loc = vtor->addr;
}
auto offset = vtor_loc - bin_start;
uint32_t ep;
memcpy(&ep, bin.data() + offset + 4, sizeof(ep));
uint32_t sp;
memcpy(&sp, bin.data() + offset, sizeof(sp));
DEBUG_LOG("Adding entry_point_item: ep %08x, sp %08x\n", ep, sp);
entry_point = std::make_shared<entry_point_item>(ep, sp);
new_block.items.push_back(entry_point);
}
}

auto sig_data = hash_andor_sign(
bin, bin_start, bin_start,
&new_block, public_key, private_key,
Expand Down
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