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Avoid using libc while doing backup

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LoveSy 2023-03-22 20:45:33 +08:00
parent 834c645212
commit 1ff11177b0
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2 changed files with 5152 additions and 8 deletions
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24
lsplt/src/main/jni/lsplt.cc
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@ -12,6 +12,7 @@
#include "elf_util.hpp"
#include "logging.hpp"
#include "syscall.hpp"
namespace {
@ -113,6 +114,7 @@ public:
bool DoHook(uintptr_t addr, uintptr_t callback, uintptr_t *backup) {
static bool kSkipRemap = false;
using PAGE = std::array<char, PAGE_SIZE>;
LOGV("Hooking %p", reinterpret_cast<void *>(addr));
auto iter = lower_bound(addr);
if (iter == end()) return false;
@ -122,22 +124,27 @@ public:
const auto len = info.end - info.start;
while (!info.backup && !info.self && !kSkipRemap) {
// let os find a suitable address
auto *backup_addr = mmap(nullptr, len, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
auto *backup_addr = sys_mmap(nullptr, len, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
LOGD("Backup %p to %p", reinterpret_cast<void *>(addr), backup_addr);
if (backup_addr == MAP_FAILED) return false;
if (auto *new_addr = mremap(reinterpret_cast<void *>(info.start), len, len,
MREMAP_FIXED | MREMAP_MAYMOVE, backup_addr);
if (auto *new_addr = sys_mremap(reinterpret_cast<void *>(info.start), len, len,
MREMAP_FIXED | MREMAP_MAYMOVE, backup_addr);
new_addr == MAP_FAILED || new_addr != backup_addr) {
kSkipRemap = true;
break;
}
if (auto *new_addr = mmap(reinterpret_cast<void *>(info.start), len,
PROT_READ | PROT_WRITE | info.perms,
MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
if (auto *new_addr = sys_mmap(reinterpret_cast<void *>(info.start), len,
PROT_READ | PROT_WRITE | info.perms,
MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
new_addr == MAP_FAILED) {
return false;
}
memcpy(reinterpret_cast<void *>(info.start), backup_addr, len);
for (uintptr_t src = reinterpret_cast<uintptr_t>(backup_addr), dest = info.start,
end = info.start + len;
dest < end; src += PAGE_SIZE, dest += PAGE_SIZE) {
static_assert(sizeof(PAGE) == PAGE_SIZE);
*reinterpret_cast<PAGE *>(dest) = *reinterpret_cast<PAGE *>(src);
}
info.backup = reinterpret_cast<uintptr_t>(backup_addr);
break;
}
@ -281,7 +288,8 @@ inline namespace v2 {
static_assert(std::numeric_limits<uintptr_t>::min() == 0);
static_assert(std::numeric_limits<uintptr_t>::max() == -1);
[[maybe_unused]] const auto &info = register_info.emplace_back(
RegisterInfo{dev, inode,
RegisterInfo{dev,
inode,
{std::numeric_limits<uintptr_t>::min(), std::numeric_limits<uintptr_t>::max()},
std::string{symbol},
callback,

5136
lsplt/src/main/jni/syscall.hpp Normal file
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