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[PATCH, rs6000] Disable ASLR in sanitizer on powerpc64.
- From: Bill Seurer <seurer at linux dot vnet dot ibm dot com>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Cc: Segher Boessenkool <segher at kernel dot crashing dot org>, Martin Liška <mliska at suse dot cz>
- Date: Thu, 8 Nov 2018 13:12:10 -0600
- Subject: [PATCH, rs6000] Disable ASLR in sanitizer on powerpc64.
[PATCH, rs6000] Disable ASLR in sanitizer on powerpc64.
Cherry pick powerpc64 sanitizer fix from upstream llvm.
See https://reviews.llvm.org/rL346030 and
https://reviews.llvm.org/D52900.
Bootstrapped and tested on powerpc64le-unknown-linux-gnu and
powerpc64-unknown-linux-gnu with no regressions. Is this ok for trunk?
2018-11-08 Bill Seurer <seurer@linux.vnet.ibm.com>
* libsanitizer/sanitizer_common/sanitizer_linux.cc (CheckASLR):
Disable ASLR for powerpc64 when using sanitizers.
Index: libsanitizer/sanitizer_common/sanitizer_linux.cc
===================================================================
--- libsanitizer/sanitizer_common/sanitizer_linux.cc (revision 265876)
+++ libsanitizer/sanitizer_common/sanitizer_linux.cc (working copy)
@@ -2008,6 +2008,17 @@
Printf("This sanitizer is not compatible with enabled ASLR\n");
Die();
}
+#elif SANITIZER_PPC64V2
+ // Disable ASLR for Linux PPC64LE.
+ int old_personality = personality(0xffffffff);
+ if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) {
+ VReport(1, "WARNING: Program is being run with address space layout "
+ "randomization (ASLR) enabled which prevents the thread and "
+ "memory sanitizers from working on powerpc64le.\n"
+ "ASLR will be disabled and the program re-executed.\n");
+ CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1);
+ ReExec();
+ }
#else
// Do nothing
#endif
--
-Bill Seurer