mirror of https://github.com/pwndbg/pwndbg.git
mallocng: Add tests for mallocng commands (#3188)
* build the mallocng binary as static and dynamic * ng-slots and ng-slotu tests * add musl to apt and pacman dev deps * lint * dont test for heap addr since donation is flaky * add ng-group check * add ng-meta test * remove inconsistent check * add ng-ctx test * test ng-find * ng-metaarea test * make tests debugger agnostic * buffer1 typopull/3204/head
k4lizen
4 months ago
committed by
GitHub
parent
b3184c7737
commit
335cc887c6
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#include <stdlib.h>
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#include <string.h>
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void break_here() {};
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int main () {
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char* buffer1 = malloc(0x20);
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char* buffer2 = malloc(0x20);
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char* buffer3 = malloc(0x20);
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char* buffer4 = malloc(0x211);
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char* buffer5 = malloc(0x211);
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break_here();
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memset(buffer1, 0xA, 0x20);
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memset(buffer2, 0xB, 0x20);
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memset(buffer3, 0xC, 0x20);
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memset(buffer4, 0xD, 0x211);
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memset(buffer5, 0xE, 0x211);
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break_here();
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free(buffer1);
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free(buffer2);
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break_here();
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free(buffer3);
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free(buffer4);
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free(buffer5);
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break_here();
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return 0;
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}
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from __future__ import annotations
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import re
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from typing import List
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import pytest
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import pwndbg
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import pwndbg.color as color
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import pwndbg.dbg
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from ....host import Controller
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from . import break_at_sym
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from . import get_binary
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from . import launch_to
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from . import pwndbg_test
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HEAP_MALLOCNG_DYN = get_binary("heap_musl_dyn.out")
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HEAP_MALLOCNG_STATIC = get_binary("heap_musl_static.out")
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# Userland only
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re_addr = r"0x[0-9a-fA-F]{1,12}"
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@pwndbg_test
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@pytest.mark.parametrize(
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"binary", [HEAP_MALLOCNG_DYN, HEAP_MALLOCNG_STATIC], ids=["dynamic", "static"]
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)
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async def test_mallocng_slot_user(ctrl: Controller, binary: str):
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await launch_to(ctrl, binary, "break_here")
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# Get out of the break_here() function.
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await ctrl.finish()
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# == Check generic command output ==
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buffer1_out = (await ctrl.execute_and_capture("ng-slotu buffer1")).splitlines()
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# Strip the colors. FIXME: After #3142 is figured out.
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buffer1_out = [color.strip(x) for x in buffer1_out]
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expected_output = [
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"slab",
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f" group: {re_addr} ",
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f" meta: {re_addr} ",
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"general",
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f" start: {re_addr} ",
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f" user start: {re_addr} aka `p`",
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rf" end: {re_addr} start \+ stride - 4",
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" stride: 0x30 distance between adjacent slots",
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""" user size: 0x20 aka "nominal size", `n`""",
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r" slack: 0x0 \(0x0\) slot's unused memory \/ 0x10",
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"in-band",
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r" offset: 0x[0-9] \(0x[0-9]{0,1}0\) distance to first slot start \/ 0x10",
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r" index: 0x0 index of slot in its group",
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" hdr reserved: 0x5 describes: end - p - n",
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" use ftr reserved",
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" ftr reserved: 0xc ",
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r" cyclic offset: NA \(not cyclic\) prevents double free, \(p - start\) / 0x10",
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"",
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r"The slot is \(probably\) allocated.",
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"",
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"",
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]
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assert len(expected_output) == len(buffer1_out)
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for i in range(len(expected_output)):
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assert re.match(expected_output[i], buffer1_out[i])
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# == Check various fields ==
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buffer2_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer2")).splitlines()
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buffer4_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer4")).splitlines()
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stride_idx = 7
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user_size_idx = 8
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slack_idx = 9
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offset_idx = 11
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index_idx = 12
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hdr_res_idx = 13
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ftr_res_idx = 15
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cyclic_idx = 16
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status_idx = 18
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# Check stride
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assert "stride" in buffer2_out[stride_idx] and " 0x30 " in buffer2_out[stride_idx]
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assert "stride" in buffer4_out[stride_idx] and " 0x2a0 " in buffer4_out[stride_idx]
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# Check user size
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assert "user size" in buffer2_out[user_size_idx] and " 0x20 " in buffer2_out[user_size_idx]
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assert "user size" in buffer4_out[user_size_idx] and " 0x211 " in buffer4_out[user_size_idx]
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# Check slack
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assert "slack" in buffer2_out[slack_idx] and " 0x0 " in buffer2_out[slack_idx]
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assert "slack" in buffer4_out[slack_idx] and " 0x8 (0x80) " in buffer4_out[slack_idx]
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# Check offset
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assert "offset" in buffer2_out[offset_idx] and " 0x3 (0x30) " in buffer2_out[offset_idx]
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if binary == HEAP_MALLOCNG_STATIC:
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# Because it's cyclic
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assert "offset" in buffer4_out[offset_idx] and " 0x1 (0x10) " in buffer4_out[offset_idx]
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else:
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assert "offset" in buffer4_out[offset_idx] and " 0x0 (0x0) " in buffer4_out[offset_idx]
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# Check index
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assert "index" in buffer2_out[index_idx] and " 0x1 " in buffer2_out[index_idx]
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assert "index" in buffer4_out[index_idx] and " 0x0 " in buffer4_out[index_idx]
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# Check reserved
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assert "hdr reserved" in buffer2_out[hdr_res_idx] and " 0x5 " in buffer2_out[hdr_res_idx]
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assert "hdr reserved" in buffer4_out[hdr_res_idx] and " 0x5 " in buffer4_out[hdr_res_idx]
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assert "use ftr reserved" in buffer2_out[hdr_res_idx + 1]
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assert "use ftr reserved" in buffer4_out[hdr_res_idx + 1]
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assert "ftr reserved" in buffer2_out[ftr_res_idx] and " 0xc " in buffer2_out[ftr_res_idx]
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if binary == HEAP_MALLOCNG_STATIC:
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assert "ftr reserved" in buffer4_out[ftr_res_idx] and " 0x7b " in buffer4_out[ftr_res_idx]
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else:
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assert "ftr reserved" in buffer4_out[ftr_res_idx] and " 0x8b " in buffer4_out[ftr_res_idx]
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# Check cyclic
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assert (
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"cyclic offset" in buffer2_out[cyclic_idx]
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and " NA (not cyclic) " in buffer2_out[cyclic_idx]
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)
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if binary == HEAP_MALLOCNG_STATIC:
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assert (
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"cyclic offset" in buffer4_out[cyclic_idx] and " 0x1 (0x10) " in buffer4_out[cyclic_idx]
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)
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else:
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assert (
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"cyclic offset" in buffer4_out[cyclic_idx]
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and " NA (not cyclic) " in buffer4_out[cyclic_idx]
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)
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# Check allocation status
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assert "slot is" in buffer2_out[status_idx] and " allocated." in buffer2_out[status_idx]
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assert "slot is" in buffer4_out[status_idx] and " allocated." in buffer4_out[status_idx]
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# == Check command on free slots ==
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break_at_sym("break_here")
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await ctrl.cont()
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await ctrl.cont()
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await ctrl.finish()
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buffer2_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer2"))
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# Make sure we found the thingy even though it is invalid locally.
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assert (
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"Could not load valid meta from local"
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" information, searching the heap.. Found it." in buffer2_out
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)
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assert "Local slot memory:" in buffer2_out
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assert "Slot information from the group/meta:" in buffer2_out
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# Check we correctly detected slot state
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assert "state: freed" in buffer2_out
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await ctrl.cont()
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await ctrl.finish()
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# Now buffer3 got free()'d and so did the group which contained buffer{1,2,3} so we cannot
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# recover information about buffer2 (it essentially doesn't exist anymore).
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buffer2_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer2"))
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if binary == HEAP_MALLOCNG_DYN:
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assert (
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"Could not load valid meta from local information, searching the heap.." in buffer2_out
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)
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assert "Found a slot with p @" in buffer2_out
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assert "doesn't seem to exist." in buffer2_out
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assert "Local memory:" in buffer2_out
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else:
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# The group got munmap()-ed.
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assert "not readable" in buffer2_out
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@pwndbg_test
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@pytest.mark.parametrize(
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"binary", [HEAP_MALLOCNG_DYN, HEAP_MALLOCNG_STATIC], ids=["dynamic", "static"]
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)
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async def test_mallocng_slot_start(ctrl: Controller, binary: str):
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await launch_to(ctrl, binary, "break_here")
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await ctrl.finish()
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# Check ng-slots is the same as ng-slotu when p == start
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# and that they aren't the same when p != start.
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slotu_buffer2_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer2"))
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slots_buffer2_out = color.strip(await ctrl.execute_and_capture("ng-slots buffer2"))
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slotu_buffer5_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer5"))
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slots_buffer5_out = color.strip(await ctrl.execute_and_capture("ng-slots buffer5"))
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assert "not cyclic" in slotu_buffer2_out
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assert slotu_buffer2_out == slots_buffer2_out
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if binary == HEAP_MALLOCNG_STATIC:
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assert "not cyclic" not in slotu_buffer5_out
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# Doing `ng-slots buffer5` will give you garbage since buffer5 is not
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# a valid slot start.
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assert slotu_buffer5_out != slots_buffer5_out
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@pwndbg_test
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@pytest.mark.parametrize(
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"binary", [HEAP_MALLOCNG_DYN, HEAP_MALLOCNG_STATIC], ids=["dynamic", "static"]
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)
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async def test_mallocng_group(ctrl: Controller, binary: str):
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await launch_to(ctrl, binary, "break_here")
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await ctrl.finish()
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# Fetch the group where buffer1 is in.
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buffer1_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer1"))
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group_addr = int(re.search(r"group:\s*(0x[0-9a-fA-F]+)", buffer1_out).group(1), 16)
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# == Check command output looks good.
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group1_out = color.strip(await ctrl.execute_and_capture(f"ng-group {group_addr}")).splitlines()
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expected_out = [
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"group",
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f" @ {re_addr} - {re_addr}",
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f" meta: {re_addr} ",
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" active_idx: 0x9 ",
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f" storage: {re_addr} start of slots",
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"---",
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" group size: 0x1f0 ",
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"meta",
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f" @ {re_addr}",
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f" prev: {re_addr} ",
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f" next: {re_addr} ",
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f" mem: {re_addr} the group",
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" avail_mask: 0x3f8 0b00000000000000000000001111111000",
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" freed_mask: 0x0 0b00000000000000000000000000000000",
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r" last_idx: 0x9 \(cnt: 0xa\) index of last slot",
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" freeable: True ",
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r" sizeclass: 0x2 \(stride: 0x30\) ",
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" maplen: 0x0 ",
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"",
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rf"Group nested in slot of another group \({re_addr}\).",
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]
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assert len(expected_out) == len(group1_out)
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for i in range(len(expected_out)):
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assert re.match(expected_out[i], group1_out[i])
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# == Check group traversal is done properly.
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assert "another group" in group1_out[-1]
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# We are going to fetch parent groups recursively until
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# we reach the outermost group which is either mmap()-ed in or
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# has donated by ld.
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cur_group_out: List[str] = group1_out
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cur_group_addr: int = group_addr
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while "another group" in cur_group_out[-1]:
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cur_group_addr = int(
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re.search(r"group \((0x[0-9a-fA-F]+)\)", cur_group_out[-1]).group(1), 16
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)
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cur_group_out = color.strip(
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await ctrl.execute_and_capture(f"ng-group {cur_group_addr}")
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).splitlines()
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if binary == HEAP_MALLOCNG_STATIC:
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assert "mmap()" in cur_group_out[-1]
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else:
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assert "donated by ld" in cur_group_out[-1]
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@pwndbg_test
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@pytest.mark.parametrize(
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"binary", [HEAP_MALLOCNG_DYN, HEAP_MALLOCNG_STATIC], ids=["dynamic", "static"]
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)
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async def test_mallocng_meta(ctrl: Controller, binary: str):
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await launch_to(ctrl, binary, "break_here")
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await ctrl.finish()
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buffer1_out = color.strip(await ctrl.execute_and_capture("ng-slotu buffer1"))
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meta_addr = int(re.search(r"meta:\s*(0x[0-9a-fA-F]+)", buffer1_out).group(1), 16)
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group_addr = int(re.search(r"group:\s*(0x[0-9a-fA-F]+)", buffer1_out).group(1), 16)
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# Check that the meta output is the same as the group output.
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# They both print the same group and meta objects.
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meta_out = color.strip(await ctrl.execute_and_capture(f"ng-meta {meta_addr}"))
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group_out = color.strip(await ctrl.execute_and_capture(f"ng-group {group_addr}"))
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assert meta_out == group_out
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@pwndbg_test
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@pytest.mark.parametrize(
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"binary", [HEAP_MALLOCNG_DYN, HEAP_MALLOCNG_STATIC], ids=["dynamic", "static"]
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)
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async def test_mallocng_malloc_context(ctrl: Controller, binary: str):
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await launch_to(ctrl, binary, "main")
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# Check that we do not find it at the first program instruction
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if binary == HEAP_MALLOCNG_DYN:
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# Since our static binary is symbolicated, we would still find
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# __malloc_context by simply looking up the symbol. So we only
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# check this for the dynamically linked binary.
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await ctrl.execute("starti")
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# This is at _dlstart - the heap is uninitialized at this point.
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ctx_out = color.strip(await ctrl.execute_and_capture("ng-ctx"))
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assert "Couldn't find" in ctx_out
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assert "will not work" in ctx_out
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assert "aborting" in ctx_out
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# == Check that we do find it at program entry
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||||||
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await ctrl.execute("entry")
|
||||||
|
# This is at _start. For a dynamically linked binary ld performed memory
|
||||||
|
# donation so the heap should be initialized at this point.
|
||||||
|
# For a statically linked binary, this won't happen but we will have access
|
||||||
|
# to the __malloc_context symbol.
|
||||||
|
# If we were testing on a stripped static binary this would fail as the
|
||||||
|
# heap would only get initialized after the first malloc() in main.
|
||||||
|
ctx_out = color.strip(await ctrl.execute_and_capture("ng-ctx"))
|
||||||
|
assert "Couldn't find" not in ctx_out
|
||||||
|
assert "will not work" not in ctx_out
|
||||||
|
assert "aborting" not in ctx_out
|
||||||
|
|
||||||
|
assert "ctx\n" in ctx_out
|
||||||
|
assert "init_done:" in ctx_out
|
||||||
|
|
||||||
|
|
||||||
|
@pwndbg_test
|
||||||
|
@pytest.mark.parametrize(
|
||||||
|
"binary", [HEAP_MALLOCNG_DYN, HEAP_MALLOCNG_STATIC], ids=["dynamic", "static"]
|
||||||
|
)
|
||||||
|
async def test_mallocng_find(ctrl: Controller, binary: str):
|
||||||
|
await launch_to(ctrl, binary, "break_here")
|
||||||
|
await ctrl.finish()
|
||||||
|
|
||||||
|
# Check no slot found
|
||||||
|
find_out = color.strip(await ctrl.execute_and_capture("ng-find $rip"))
|
||||||
|
assert "No slot found containing that address.\n" == find_out
|
||||||
|
|
||||||
|
buffer1_addr = int(pwndbg.dbg.selected_frame().evaluate_expression("buffer1"))
|
||||||
|
|
||||||
|
# Check we find the slot in the simplest case of providing p.
|
||||||
|
find_out = color.strip(await ctrl.execute_and_capture("ng-find buffer1"))
|
||||||
|
|
||||||
|
assert "No slot found" not in find_out
|
||||||
|
start_addr = int(re.search(r"start:\s*(0x[0-9a-fA-F]+)", find_out).group(1), 16)
|
||||||
|
user_addr = int(re.search(r"user start:\s*(0x[0-9a-fA-F]+)", find_out).group(1), 16)
|
||||||
|
assert buffer1_addr == start_addr == user_addr
|
||||||
|
|
||||||
|
group_addr = int(re.search(r"group:\s*(0x[0-9a-fA-F]+)", find_out).group(1), 16)
|
||||||
|
|
||||||
|
# Hit the buffer1 header metadata
|
||||||
|
find_out = color.strip(await ctrl.execute_and_capture("ng-find buffer1-1"))
|
||||||
|
|
||||||
|
# We should hit the slot that holds buffer1's group.
|
||||||
|
hit_start_addr = int(re.search(r"start:\s*(0x[0-9a-fA-F]+)", find_out).group(1), 16)
|
||||||
|
assert group_addr == hit_start_addr
|
||||||
|
|
||||||
|
# Hit the buffer1 header metadata but with -m
|
||||||
|
find_out = color.strip(await ctrl.execute_and_capture("ng-find buffer1-1 --metadata"))
|
||||||
|
|
||||||
|
# We should hit the buffer1 slot
|
||||||
|
hit_start_addr = int(re.search(r"start:\s*(0x[0-9a-fA-F]+)", find_out).group(1), 16)
|
||||||
|
assert buffer1_addr == hit_start_addr
|
||||||
|
|
||||||
|
# Check that `--shallow` works. Note that `--all` prints the group allocation method.
|
||||||
|
find_out = color.strip(await ctrl.execute_and_capture("ng-find buffer1 --shallow --all"))
|
||||||
|
assert "donated by ld" in find_out or "mmap" in find_out
|
||||||
|
assert "nested" not in find_out.splitlines()[-1]
|
||||||
|
|
||||||
|
|
||||||
|
@pwndbg_test
|
||||||
|
@pytest.mark.parametrize(
|
||||||
|
"binary", [HEAP_MALLOCNG_DYN, HEAP_MALLOCNG_STATIC], ids=["dynamic", "static"]
|
||||||
|
)
|
||||||
|
async def test_mallocng_metaarea(ctrl: Controller, binary: str):
|
||||||
|
await launch_to(ctrl, binary, "break_here")
|
||||||
|
await ctrl.finish()
|
||||||
|
|
||||||
|
context = color.strip(await ctrl.execute_and_capture("ng-ctx"))
|
||||||
|
secret = int(re.search(r"secret:\s*(0x[0-9a-fA-F]+)", context).group(1), 16)
|
||||||
|
meta_area_addr = int(re.search(r"meta_area_head:\s*(0x[0-9a-fA-F]+)", context).group(1), 16)
|
||||||
|
|
||||||
|
meta_area_out = color.strip(
|
||||||
|
await ctrl.execute_and_capture(f"ng-metaarea {meta_area_addr:#x}")
|
||||||
|
).splitlines()
|
||||||
|
|
||||||
|
expected_out = [
|
||||||
|
"meta_area",
|
||||||
|
f" @ {meta_area_addr:#x} - {re_addr}",
|
||||||
|
f" check: {secret:#x}",
|
||||||
|
" next: 0",
|
||||||
|
r" nslots: 0x[0-9a-f]{2}",
|
||||||
|
f" slots: {re_addr} ",
|
||||||
|
]
|
||||||
|
|
||||||
|
assert len(expected_out) == len(meta_area_out)
|
||||||
|
|
||||||
|
for i in range(len(expected_out)):
|
||||||
|
assert re.match(expected_out[i], meta_area_out[i])
|
||||||
Loading…
Reference in new issue