Make Page Executable in Debugger

# --- Setup mprotect syscall (Linux x64) ---
# rax = 10 → sys_mprotect
# rdi = address (MUST be page-aligned)
# rsi = size (usually 0x1000 = 1 page)
# rdx = protection flags (7 = RWX)

set $rax = 10
set $rdi = 0x402000      # TARGET REGION (ensure it's page-aligned, e.g. ends with 000)
set $rsi = 0x1000        # Size to change (1 memory page)
set $rdx = 7             # PROT_READ | PROT_WRITE | PROT_EXEC

# --- Inject raw syscall instruction at current RIP ---
# 0x0f 0x05 → syscall
# 0xcc      → int3 (trap to safely regain control after syscall)

set {unsigned char}($rip)   = 0x0f   # syscall
set {unsigned char}($rip+1) = 0x05
set {unsigned char}($rip+2) = 0xcc   # breakpoint after syscall

# --- Execute syscall ---
continue                   # runs patched instruction → mprotect

# --- Verify result ---
# rax == 0 → success
# vmmap should now show 'rwx' for the region

vmmap

# --- Transfer execution to shellcode ---
jump *0x402000             # execute payload from now-executable memory