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//
// Print physical memory location for each page for each memory mapping
// This requires CAP_SYS_ADMIN privilege, or root, otherwise physical memory addresses will be zero
//
// Vocabulary
// VA = Virtual Address: memory address from a process point of view
// VPN = Virtual Page Number: page number of the a Virtual Memory address
// PA = Physical Address: memory address in physical memory
// PFN = Page Frame Number: page number of a Physical Address
//
use procfs::process::MMapPath;
use procfs::process::Process;
fn main() {
if !rustix::process::geteuid().is_root() {
println!("WARNING: Access to /proc/<PID>/pagemap requires root, re-run with sudo");
}
let page_size = procfs::page_size();
let process = Process::myself().expect("Unable to load myself!");
let mut pagemap = process.pagemap().unwrap();
let mem_map = process.maps().unwrap();
for memory_map in mem_map {
let va_start = memory_map.address.0;
let va_end = memory_map.address.1;
let vpn_start = (va_start / page_size) as usize;
let vpn_end = (va_end / page_size) as usize;
// can't scan Vsyscall, so skip it
if memory_map.pathname == MMapPath::Vsyscall {
continue;
}
println!("Memory mapping {:?}", memory_map);
for vpn in vpn_start..vpn_end {
let va = vpn * page_size as usize;
let page_info = pagemap.get_info(vpn).unwrap();
match page_info {
procfs::process::PageInfo::MemoryPage(memory_page) => {
let pfn = memory_page.get_page_frame_number();
let pa = pfn.0 * page_size;
println!("virt_mem: 0x{:x}, pfn: 0x{:x}, phys_addr: 0x{:x}", va, pfn, pa);
}
procfs::process::PageInfo::SwapPage(swap_page_flags) => {
let swap_type = swap_page_flags.get_swap_type();
let swap_offset = swap_page_flags.get_swap_offset();
println!(
"virt_mem: 0x{:x}, swap: {:}, offset: 0x{:x}",
va, swap_type, swap_offset
);
}
}
}
}
if !rustix::process::geteuid().is_root() {
println!("\n\nWARNING: Access to /proc/<PID>/pagemap requires root, re-run with sudo");
}
}
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