mirror of
https://github.com/topjohnwu/Magisk.git
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117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
#include <cinttypes>
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#include <utils.hpp>
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#include "zygisk.hpp"
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using namespace std;
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namespace {
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struct map_info {
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uintptr_t start;
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uintptr_t end;
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uintptr_t off;
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int perms;
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const char *path;
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map_info() : start(0), end(0), off(0), perms(0), path(nullptr) {}
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};
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} // namespace
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template<typename Func>
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static void parse_maps(int pid, Func fn) {
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char file[32];
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// format: start-end perms offset dev inode path
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sprintf(file, "/proc/%d/maps", pid);
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file_readline(true, file, [=](string_view l) -> bool {
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char *line = (char *) l.data();
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map_info info;
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char perm[5];
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int path_off;
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if (sscanf(line, "%" PRIxPTR "-%" PRIxPTR " %4s %" PRIxPTR " %*x:%*x %*d %n%*s",
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&info.start, &info.end, perm, &info.off, &path_off) != 4)
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return true;
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// Parse permissions
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if (perm[0] != '-')
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info.perms |= PROT_READ;
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if (perm[1] != '-')
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info.perms |= PROT_WRITE;
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if (perm[2] != '-')
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info.perms |= PROT_EXEC;
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info.path = line + path_off;
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return fn(info);
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});
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}
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static vector<map_info> find_maps(const char *name) {
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vector<map_info> maps;
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parse_maps(getpid(), [=, &maps](map_info &info) -> bool {
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if (strcmp(info.path, name) == 0)
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maps.emplace_back(info);
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return true;
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});
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return maps;
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}
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void unmap_all(const char *name) {
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vector<map_info> maps = find_maps(name);
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for (map_info &info : maps) {
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void *addr = reinterpret_cast<void *>(info.start);
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size_t size = info.end - info.start;
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if (info.perms & PROT_READ) {
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// Make sure readable pages are still readable
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void *dummy = xmmap(nullptr, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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mremap(dummy, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, addr);
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} else {
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munmap(addr, size);
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}
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}
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}
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void remap_all(const char *name) {
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vector<map_info> maps = find_maps(name);
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for (map_info &info : maps) {
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void *addr = reinterpret_cast<void *>(info.start);
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size_t size = info.end - info.start;
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void *copy = xmmap(nullptr, size, PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if ((info.perms & PROT_READ) == 0) {
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mprotect(addr, size, PROT_READ);
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}
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memcpy(copy, addr, size);
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mremap(copy, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, addr);
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mprotect(addr, size, info.perms);
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}
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}
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uintptr_t get_function_off(int pid, uintptr_t addr, char *lib) {
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uintptr_t off = 0;
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parse_maps(pid, [=, &off](map_info &info) -> bool {
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if (addr >= info.start && addr < info.end) {
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if (lib)
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strcpy(lib, info.path);
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off = addr - info.start + info.off;
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return false;
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}
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return true;
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});
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return off;
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}
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uintptr_t get_function_addr(int pid, const char *lib, uintptr_t off) {
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uintptr_t addr = 0;
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parse_maps(pid, [=, &addr](map_info &info) -> bool {
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if (strcmp(info.path, lib) == 0 && (info.perms & PROT_EXEC)) {
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addr = info.start - info.off + off;
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return false;
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}
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return true;
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});
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return addr;
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}
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