04ed12ca3f
ReadProcessMemory will not perform the read if part of the memory is unreadable (and even though the API has a `number_of_bytes_read` argument). To make this work, I explicitly inspect the memory region being read and only read the accessible part.
61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
"""
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Test the memory commands operating on memory regions with holes (inaccessible
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pages)
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"""
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import lldb
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from lldbsuite.test.lldbtest import *
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import lldbsuite.test.lldbutil as lldbutil
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from lldbsuite.test.decorators import *
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class MemoryHolesTestCase(TestBase):
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NO_DEBUG_INFO_TESTCASE = True
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def setUp(self):
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super().setUp()
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# Find the line number to break inside main().
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self.line = line_number("main.cpp", "// break here")
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def _prepare_inferior(self):
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self.build()
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exe = self.getBuildArtifact("a.out")
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self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
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# Break in main() after the variables are assigned values.
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lldbutil.run_break_set_by_file_and_line(
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self, "main.cpp", self.line, num_expected_locations=1, loc_exact=True
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)
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self.runCmd("run", RUN_SUCCEEDED)
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# The stop reason of the thread should be breakpoint.
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self.expect(
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"thread list",
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STOPPED_DUE_TO_BREAKPOINT,
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substrs=["stopped", "stop reason = breakpoint"],
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)
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# The breakpoint should have a hit count of 1.
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lldbutil.check_breakpoint(self, bpno=1, expected_hit_count=1)
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# Avoid the expression evaluator, as it can allocate allocate memory
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# inside the holes we've deliberately left empty.
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self.memory = self.frame().FindVariable("mem_with_holes").GetValueAsUnsigned()
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self.pagesize = self.frame().FindVariable("pagesize").GetValueAsUnsigned()
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positions = self.frame().FindVariable("positions")
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self.positions = [
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positions.GetChildAtIndex(i).GetValueAsUnsigned()
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for i in range(positions.GetNumChildren())
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]
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self.assertEqual(len(self.positions), 5)
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def test_memory_read(self):
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self._prepare_inferior()
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error = lldb.SBError()
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content = self.process().ReadMemory(self.memory, 2 * self.pagesize, error)
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self.assertEqual(len(content), self.pagesize)
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self.assertEqual(content[0:7], b"needle\0")
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self.assertTrue(error.Fail())
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