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pwndbg
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Don't infinitely decrement ESP; theres always more memory

This commit is contained in:
Zach Riggle 2015-05-16 03:25:21 -04:00
parent 0a8900a3a2
commit add3acba15
1 changed files with 5 additions and 4 deletions
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9
pwndbg/stack.py
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@ -54,17 +54,18 @@ def update():
for its stack.
"""
curr_thread = gdb.selected_thread()
try:
for thread in gdb.selected_inferior().threads():
thread.switch()
sp = pwndbg.regs.sp
sp_low = sp & ~(0xfff)
# If we don't already know about this thread, create
# a new Page mapping for it.
page = stacks.get(thread.ptid, None)
if page is None:
start = pwndbg.memory.find_lower_boundary(sp)
start = sp_low
stop = find_upper_stack_boundary(sp)
page = pwndbg.memory.Page(start, stop-start, 6 if not is_executable() else 7, 0, '[stack]')
stacks[thread.ptid] = page
@ -73,8 +74,8 @@ def update():
page.objfile = '[stack]'
# If we *DO* already know about this thread, just
# update the lower boundary.
low = pwndbg.memory.find_lower_boundary(page.vaddr)
# update the lower boundary if it got any lower.
low = min(page.vaddr, sp_low)
if low != page.vaddr:
page.memsz += (page.vaddr - low)
page.vaddr = low