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physler - BRICS CTF 2024

physler was another challenge from BRICS CTF that I solved. we basically got a kernel module that has two ioctl requests defined: case IOCTL_MAP_PHYS_ADDR: { if (copy_from_user(&_map, (void*)arg, sizeof(_map))) { return -EFAULT; } if (mem) iounmap(mem); mem = ioremap(_map.phys_addr, _map.size); if (!mem) { return -EFAULT; } break; } case IOCTL_WRITE_PHYS_MEM: { if (!mem) return -EFAULT; if (copy_from_user(&_write, (void*)arg, sizeof(_write))) { return -EFAULT; } size = _write.size; if (size > sizeof(kernel_buffer)) size = sizeof(kernel_buffer); if (copy_from_user(kernel_buffer, (char *)_write.



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physler - BRICS CTF 2024

https://b17fr13nds.github.io/posts/brics_physler

physler was another challenge from BRICS CTF that I solved. we basically got a kernel module that has two ioctl requests defined: case IOCTL_MAP_PHYS_ADDR: { if (copy_from_user(&_map, (void*)arg, sizeof(_map))) { return -EFAULT; } if (mem) iounmap(mem); mem = ioremap(_map.phys_addr, _map.size); if (!mem) { return -EFAULT; } break; } case IOCTL_WRITE_PHYS_MEM: { if (!mem) return -EFAULT; if (copy_from_user(&_write, (void*)arg, sizeof(_write))) { return -EFAULT; } size = _write.size; if (size > sizeof(kernel_buffer)) size = sizeof(kernel_buffer); if (copy_from_user(kernel_buffer, (char *)_write.



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https://b17fr13nds.github.io/posts/brics_physler

physler - BRICS CTF 2024

physler was another challenge from BRICS CTF that I solved. we basically got a kernel module that has two ioctl requests defined: case IOCTL_MAP_PHYS_ADDR: { if (copy_from_user(&_map, (void*)arg, sizeof(_map))) { return -EFAULT; } if (mem) iounmap(mem); mem = ioremap(_map.phys_addr, _map.size); if (!mem) { return -EFAULT; } break; } case IOCTL_WRITE_PHYS_MEM: { if (!mem) return -EFAULT; if (copy_from_user(&_write, (void*)arg, sizeof(_write))) { return -EFAULT; } size = _write.size; if (size > sizeof(kernel_buffer)) size = sizeof(kernel_buffer); if (copy_from_user(kernel_buffer, (char *)_write.

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      physler was another challenge from BRICS CTF that I solved. we basically got a kernel module that has two ioctl requests defined: case IOCTL_MAP_PHYS_ADDR: { if (copy_from_user(&_map, (void*)arg, sizeof(_map))) { return -EFAULT; } if (mem) iounmap(mem); mem = ioremap(_map.phys_addr, _map.size); if (!mem) { return -EFAULT; } break; } case IOCTL_WRITE_PHYS_MEM: { if (!mem) return -EFAULT; if (copy_from_user(&_write, (void*)arg, sizeof(_write))) { return -EFAULT; } size = _write.size; if (size > sizeof(kernel_buffer)) size = sizeof(kernel_buffer); if (copy_from_user(kernel_buffer, (char *)_write.

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      physler - BRICS CTF 2024
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      physler was another challenge from BRICS CTF that I solved. we basically got a kernel module that has two ioctl requests defined: case IOCTL_MAP_PHYS_ADDR: { if (copy_from_user(&_map, (void*)arg, sizeof(_map))) { return -EFAULT; } if (mem) iounmap(mem); mem = ioremap(_map.phys_addr, _map.size); if (!mem) { return -EFAULT; } break; } case IOCTL_WRITE_PHYS_MEM: { if (!mem) return -EFAULT; if (copy_from_user(&_write, (void*)arg, sizeof(_write))) { return -EFAULT; } size = _write.size; if (size > sizeof(kernel_buffer)) size = sizeof(kernel_buffer); if (copy_from_user(kernel_buffer, (char *)_write.

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      physler - BRICS CTF 2024
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      physler was another challenge from BRICS CTF that I solved. we basically got a kernel module that has two ioctl requests defined: case IOCTL_MAP_PHYS_ADDR: { if (copy_from_user(&_map, (void*)arg, sizeof(_map))) { return -EFAULT; } if (mem) iounmap(mem); mem = ioremap(_map.phys_addr, _map.size); if (!mem) { return -EFAULT; } break; } case IOCTL_WRITE_PHYS_MEM: { if (!mem) return -EFAULT; if (copy_from_user(&_write, (void*)arg, sizeof(_write))) { return -EFAULT; } size = _write.size; if (size > sizeof(kernel_buffer)) size = sizeof(kernel_buffer); if (copy_from_user(kernel_buffer, (char *)_write.

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