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*actually* fix smoldd this time

This commit is contained in:
PoroCYon 2020-08-24 02:48:07 +02:00
parent 6af8463ef1
commit ebaa50357d
1 changed files with 15 additions and 4 deletions
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19
smoldd.py
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@ -8,6 +8,9 @@ import smol.linkmap as linkmap
from smol.shared import *
from smol.parse import *
# TODO: support for hashes that aren't djb2
def readbyte(blob, off): return struct.unpack('<B', blob[off:off+1])[0], (off+1)
def readint(blob, off): return struct.unpack('<I', blob[off:off+4])[0], (off+4)
def readlong(blob, off): return struct.unpack('<Q', blob[off:off+8])[0], (off+8)
@ -83,7 +86,7 @@ def get_hashtbl(elf, blob, args):
assert txtoff < len(blob), "wtf??? (can't find a push IMM32 instruction which pushes the hashtable address)"
txtoff = txtoff + 1
eprintf("Hash table offset: 0x%08x?" % txtoff)
#eprintf("Hash table offset: 0x%08x?" % txtoff)
htaddr = struct.unpack('<I', blob[txtoff:txtoff+4])[0]
else: # 64-bit
txtoff = addr2off(elf, elf.entry)
@ -97,8 +100,9 @@ def get_hashtbl(elf, blob, args):
# except, this is actually the value we're looking for when the binary
# had been linked with -fuse-dnload-loader! so let's just check the
# value
htaddr = struct.unpack('<I', blob[txtoff:txtoff+4])
htaddr = struct.unpack('<I', blob[txtoff:txtoff+4])[0]
#eprintf("ELF entry == 0x%08x" % elf.entry)
if htaddr == elf.entry:
# now we can look for the interesting address
while blob[txtoff] != 0x68:
@ -106,16 +110,23 @@ def get_hashtbl(elf, blob, args):
assert txtoff < len(blob), "wtf??? (can't find a push IMM32 instruction which pushes the hashtable address)"
txtoff = txtoff + 1
#eprintf("Hash table offset: 0x%08x?" % txtoff)
htaddr = struct.unpack('<I', blob[txtoff:txtoff+4])[0]
#eprintf("Hash table offset: 0x%08x?" % txtoff)
htaddr = struct.unpack('<I', blob[txtoff:txtoff+4])[0]
else:
pass#eprintf("Hash table offset: 0x%08x?" % txtoff)
assert htaddr is not None, "wtf? (no hashtable address)"
#eprintf("Hash table address: 0x%08x" % htaddr)
htoff = addr2off(elf, htaddr)
#eprintf("Hash table offset: 0x%08x" % htoff)
tbl = []
while True:
#eprintf("sym from 0x%08x" % htoff)
if len(blob)-htoff < 4:
#eprintf("htoff = 0x%08x, len=%08x" % (htoff, len(blob)))
if len(blob) <= htoff and len(tbl) > 0:
break
if struct.unpack('<B', blob[htoff:htoff+1])[0] == 0:
break
val = struct.unpack('<I', blob[htoff:htoff+4])[0]