================
@@ -0,0 +1,129 @@
+"""
+Test lldb's support for the AArch64 Permission Overlay extension (POE), which
+is used to implement Linux's memory protection keys feature.
+"""
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class AArch64LinuxPOE(TestBase):
+ NO_DEBUG_INFO_TESTCASE = True
+
+ EXPECTED_POR = "por = 0x0000000001234567"
+ EXPECTED_POR_FIELDS = (
+ " = {\n"
+ " Perm15 = No Access\n"
+ " Perm14 = No Access\n"
+ " Perm13 = No Access\n"
+ " Perm12 = No Access\n"
+ " Perm11 = No Access\n"
+ " Perm10 = No Access\n"
+ " Perm9 = No Access\n"
+ " Perm8 = No Access\n"
+ " Perm7 = No Access\n"
+ " Perm6 = Read\n"
+ " Perm5 = Execute\n"
+ " Perm4 = Read, Execute\n"
+ " Perm3 = Write\n"
+ " Perm2 = Write, Read\n"
+ " Perm1 = Write, Execute\n"
+ " Perm0 = Read, Write, Execute\n"
+ " }"
+ )
+
+ @skipUnlessArch("aarch64")
+ @skipUnlessPlatform(["linux"])
+ def test_poe_live(self):
+ if not self.isAArch64POE():
+ self.skipTest("POE must be present.")
+
+ self.build()
+ self.runCmd("file " + self.getBuildArtifact("a.out"),
CURRENT_EXECUTABLE_SET)
+
+ lldbutil.run_break_set_by_file_and_line(
+ self,
+ "main.c",
+ line_number("main.c", "// Set break point at this line."),
+ num_expected_locations=1,
+ )
+
+ self.runCmd("run", RUN_SUCCEEDED)
+
+ if self.process().GetState() == lldb.eStateExited:
+ self.fail("Test program failed to run.")
+
+ self.expect(
+ "thread list",
+ STOPPED_DUE_TO_BREAKPOINT,
+ substrs=["stopped", "stop reason = breakpoint"],
+ )
+
+ self.expect(
+ "register read --all",
+ substrs=[
+ "Permission Overlay Registers",
+ f"{self.EXPECTED_POR}",
+ ],
+ )
+
+ if self.hasXMLSupport():
+ self.expect(
+ "register read por",
+ substrs=[f" {self.EXPECTED_POR}\n" +
self.EXPECTED_POR_FIELDS],
+ )
+
+ # POR should be restored after expression evaluation.
+ self.expect("expression expr_function()", substrs=["$0 = 1"])
+ self.expect("register read por", substrs=[self.EXPECTED_POR])
+
+ # Not passing this to the application allows us to fix the permissions
+ # using lldb, then continue to a normal exit.
+ self.runCmd("process handle SIGSEGV --pass false")
+
+ self.expect(
+ "continue",
+ substrs=[
+ "stop reason = signal SIGSEGV: failed protection key checks
(fault address="
+ ],
+ )
+
+ # This fault should have happened due to the write, not the read.
+ self.assertEqual(
+ self.dbg.GetSelectedTarget()
+ .GetProcess()
+ .GetSelectedThread()
+ .GetSelectedFrame()
+ .GetFunctionName(),
+ "cause_write_fault",
+ )
+
+ # Allow writes so we can continue. This value has permission 6 changed
+ # from read only (1) to read+write (4).
----------------
DavidSpickett wrote:
This should say:
from read only (1) to write (4)
Will fix this.
https://github.com/llvm/llvm-project/pull/177145
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