python.sheap Namespace Reference

Classes
class	SHeap

Functions
	sheap_read_word (inf, addr)
	sheap_looks_free (inf, addr)
	sheap_scan_2 (inf, addr)
	sheap_scan_1 (addr1, addr2, forced)
	sheap_scan (addr1, addr2, forced)
	sheap (arg, forced)

Function Documentation

sheap()

python.sheap.sheap	(		arg,
			forced )

Definition at line 66 of file sheap.py.

def sheap (arg, forced):
    args = arg.split()
    if not args:
        raise gdb.GdbError ('Missing start address')
    start_arg = gdb.parse_and_eval (args[0])
    end_arg = gdb.parse_and_eval (args[1]) if len(args) > 1 else start_arg + 1024
    return sheap_scan (start_arg, end_arg, forced)
 
 

sheap_looks_free()

python.sheap.sheap_looks_free	(		inf,
			addr )

Definition at line 14 of file sheap.py.

def sheap_looks_free (inf, addr):
    head = sheap_read_word (inf, addr+8)
    if head > 128*1024*1024 or head < 8: return False
    #print (hex(addr), hex(head))
    head = head & ~1
    if head & 2: return False
    foot = sheap_read_word (inf, addr+head)
    if head != foot: return False
    nexthead = sheap_read_word (inf, addr+head+8)
    if nexthead & 1: return False
    #print ('found', hex(addr), hex(head), hex(foot), hex(nexthead))
    return True
 

sheap_read_word()

python.sheap.sheap_read_word	(		inf,
			addr )

Definition at line 10 of file sheap.py.

def sheap_read_word (inf, addr):
    mv = inf.read_memory (addr, 8)
    return mv.cast('L')[0]
 

sheap_scan()

python.sheap.sheap_scan	(		addr1,
			addr2,
			forced )

Definition at line 57 of file sheap.py.

def sheap_scan (addr1, addr2, forced):
    addr1 -= 8
    while addr1 < addr2:
        addr1 = sheap_scan_1 (addr1, addr2, forced)
        forced = False
    gdb.flush()
    return
 
 

sheap_scan_1()

python.sheap.sheap_scan_1	(		addr1,
			addr2,
			forced )

Definition at line 46 of file sheap.py.

def sheap_scan_1 (addr1, addr2, forced):
    inf = gdb.selected_inferior()
    addr1 = (addr1 + 7) & ~7 # Align
    if not forced:
        while addr1 < addr2 and not sheap_looks_free (inf, addr1):
            addr1 += 8
    while addr1 < addr2:
        addr1, ok = sheap_scan_2 (inf, addr1)
        if not ok: break
    return addr1
 

sheap_scan_2()

python.sheap.sheap_scan_2	(		inf,
			addr )

Definition at line 27 of file sheap.py.

def sheap_scan_2 (inf, addr):
    head = sheap_read_word (inf, addr+8)
    if head > 128*1024*1024 or head < 8:
        return addr+8, False
    head = head & ~1
    if head & 2:
        return addr+8, False
    nexthead = sheap_read_word (inf, addr+head+8)
    if nexthead & 1:
        type = ' USED '
    else:
        if not sheap_looks_free (inf, addr):
            return addr+8, False
        type = ' FREE '
    #print('sheap_scan_2' ,hex(addr), hex(head), hex(nexthead), type)
    s = f'{int(addr):016x}:{type}{int(head):08x}\n'
    gdb.write (s)
    return addr+head, True