$(1)$

The malloc function in libc uses two function calls: munmap and brk$.$

$[$ Select $]["$True$",$ "False"$]$

$(2)$

If chunk size permitting, malloc function will allocate memory chunk first from TCache, then small bins, then large bins, then fast bins.

$[$ Select $]["$True$",$ "False"$]$

$(3)$

The malloc function uses system calls to request file$-$mapping memory.

$[$ Select $]["$False$",$ "True"$]$

$(4)$

The malloc function uses system calls to request memory backed by some files.

$[$ Select $]["$True$",$ "False"$]$

$(5)$

The deferred frees will be resolved in later free function calls.

$[$ Select $]["$False$",$ "True"$]$

$(6)$

The double$-$linked fast bin free chunks can leak libc base address.

$[$ Select $]["$False$",$ "True"$]$

$$