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Add executable= argument to ELF.search #1576

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merged 3 commits into from
Jun 11, 2020
Merged

Add executable= argument to ELF.search #1576

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648766b
Add `executable=` argument like `writable=` to ELF.search
saullocarvalho Jun 11, 2020
510dfc8
Add doctest using ELF.search with `executable = True`
saullocarvalho Jun 11, 2020
09605b2
Fix `__next__()` issue.
saullocarvalho Jun 11, 2020
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14 changes: 12 additions & 2 deletions pwnlib/elf/elf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1115,8 +1115,8 @@ def libc_start_main_return(self):
return_from_main = int(return_from_main[ : return_from_main.index(':') ], 16)
return return_from_main

def search(self, needle, writable = False):
"""search(needle, writable = False) -> generator
def search(self, needle, writable = False, executable = False):
"""search(needle, writable = False, executable = False) -> generator

Search the ELF's virtual address space for the specified string.

Expand All @@ -1129,6 +1129,7 @@ def search(self, needle, writable = False):
Arguments:
needle(str): String to search for.
writable(bool): Search only writable sections.
executable(bool): Search only executable sections.

Yields:
An iterator for each virtual address that matches.
Expand All @@ -1146,11 +1147,20 @@ def search(self, needle, writable = False):

>>> len(list(bash.search(b'GNU bash'))) > 0
True

It is also possible to search for instructions in executable sections.

>>> binary = ELF.from_assembly('nop; mov eax, 0; jmp esp; ret')
>>> jmp_addr = next(binary.search(asm('jmp esp'), executable = True))
>>> binary.read(jmp_addr, 2) == asm('jmp esp')
True
"""
load_address_fixup = (self.address - self.load_addr)

if writable:
segments = self.writable_segments
elif executable:
segments = self.executable_segments
else:
segments = self.segments

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