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UserspaceEmulator: Remember VM region names for MAP_ANONYMOUS

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For some reason we only remembered the names of MAP_FILE mmap regions.
This commit is contained in:
Andreas Kling 2021-03-09 11:23:08 +01:00
parent 735a6482ac
commit 728d947601
3 changed files with 17 additions and 18 deletions
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23
Userland/DevTools/UserspaceEmulator/Emulator.cpp
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@ -1042,17 +1042,18 @@ u32 Emulator::virt$mmap(u32 params_addr)
final_address = result.value().base().get();
auto final_size = result.value().size();
if (params.flags & MAP_ANONYMOUS)
mmu().add_region(MmapRegion::create_anonymous(final_address, final_size, params.prot));
else {
String name_str;
if (params.name.characters) {
auto name = ByteBuffer::create_uninitialized(params.name.length);
mmu().copy_from_vm(name.data(), (FlatPtr)params.name.characters, params.name.length);
name_str = { name.data(), name.size() };
}
auto region = MmapRegion::create_file_backed(final_address, final_size, params.prot, params.flags, params.fd, params.offset, name_str);
if (region->name() == "libc.so: .text (Emulated)") {
String name_str;
if (params.name.characters) {
auto name = ByteBuffer::create_uninitialized(params.name.length);
mmu().copy_from_vm(name.data(), (FlatPtr)params.name.characters, params.name.length);
name_str = { name.data(), name.size() };
}
if (params.flags & MAP_ANONYMOUS) {
mmu().add_region(MmapRegion::create_anonymous(final_address, final_size, params.prot, move(name_str)));
} else {
auto region = MmapRegion::create_file_backed(final_address, final_size, params.prot, params.flags, params.fd, params.offset, move(name_str));
if (region->name() == "libc.so: .text") {
bool rc = find_malloc_symbols(*region);
VERIFY(rc);
}

8
Userland/DevTools/UserspaceEmulator/MmapRegion.cpp
View file

@ -45,11 +45,12 @@ static void free_pages(void* ptr, size_t bytes)
VERIFY(rc == 0);
}
NonnullOwnPtr<MmapRegion> MmapRegion::create_anonymous(u32 base, u32 size, u32 prot)
NonnullOwnPtr<MmapRegion> MmapRegion::create_anonymous(u32 base, u32 size, u32 prot, String name)
{
auto data = (u8*)mmap_initialized(size, 0, nullptr);
auto shadow_data = (u8*)mmap_initialized(size, 1, "MmapRegion ShadowData");
auto region = adopt_own(*new MmapRegion(base, size, prot, data, shadow_data));
region->m_name = move(name);
return region;
}
@ -60,10 +61,7 @@ NonnullOwnPtr<MmapRegion> MmapRegion::create_file_backed(u32 base, u32 size, u32
auto shadow_data = (u8*)mmap_initialized(size, 1, "MmapRegion ShadowData");
auto region = adopt_own(*new MmapRegion(base, size, prot, data, shadow_data));
region->m_file_backed = true;
if (!name.is_empty()) {
name = String::formatted("{} (Emulated)", name);
region->m_name = name;
}
region->m_name = move(name);
return region;
}

4
Userland/DevTools/UserspaceEmulator/MmapRegion.h
View file

@ -36,8 +36,8 @@ class MallocTracer;
class MmapRegion final : public Region {
public:
static NonnullOwnPtr<MmapRegion> create_anonymous(u32 base, u32 size, u32 prot);
static NonnullOwnPtr<MmapRegion> create_file_backed(u32 base, u32 size, u32 prot, int flags, int fd, off_t offset, String name = {});
static NonnullOwnPtr<MmapRegion> create_anonymous(u32 base, u32 size, u32 prot, String name);
static NonnullOwnPtr<MmapRegion> create_file_backed(u32 base, u32 size, u32 prot, int flags, int fd, off_t offset, String name);
virtual ~MmapRegion() override;
virtual ValueWithShadow<u8> read8(u32 offset) override;