| 15 | } |
| 16 | |
| 17 | bool MemoryPatcher::verifyAccess(void* target, size_t count, bool write) |
| 18 | { |
| 19 | auto* sptr = (uint8_t*)target; |
| 20 | uint8_t* eptr = sptr + count; |
| 21 | |
| 22 | // Find the valid memory ranges |
| 23 | if (ranges.empty()) |
| 24 | p->getMemRanges(ranges); |
| 25 | |
| 26 | // Find the ranges that this area spans |
| 27 | unsigned start = 0; |
| 28 | while (start < ranges.size() && ranges[start].end <= sptr) |
| 29 | start++; |
| 30 | if (start >= ranges.size() || ranges[start].start > sptr) |
| 31 | return false; |
| 32 | |
| 33 | unsigned end = start + 1; |
| 34 | while (end < ranges.size() && ranges[end].start < eptr) |
| 35 | { |
| 36 | if (ranges[end].start != ranges[end - 1].end) |
| 37 | return false; |
| 38 | end++; |
| 39 | } |
| 40 | if (ranges[end - 1].end < eptr) |
| 41 | return false; |
| 42 | |
| 43 | // Verify current permissions |
| 44 | for (unsigned i = start; i < end; i++) |
| 45 | if (!ranges[i].valid || !(ranges[i].read || ranges[i].execute) || ranges[i].shared) |
| 46 | return false; |
| 47 | |
| 48 | // Apply writable permissions & update |
| 49 | for (unsigned i = start; i < end; i++) |
| 50 | { |
| 51 | auto& perms = ranges[i]; |
| 52 | if ((perms.write || !write) && perms.read) |
| 53 | continue; |
| 54 | |
| 55 | save.push_back(perms); |
| 56 | perms.write = perms.read = true; |
| 57 | if (!p->setPermissions(perms, perms)) |
| 58 | return false; |
| 59 | } |
| 60 | |
| 61 | return true; |
| 62 | } |
| 63 | |
| 64 | bool MemoryPatcher::write(void* target, const void* src, size_t size) |
| 65 | { |
no test coverage detected