2019-11-26  Jakub Jelinek  <jakub@redhat.com>

	PR sanitizer/92154
	* sanitizer_common/sanitizer_platform_limits_posix.h: Cherry-pick
	llvm-project revision 947f9692440836dcb8d88b74b69dd379d85974ce.
	* sanitizer_common/sanitizer_platform_limits_posix.cc: Likewise.

Index: gcc-7.5.0+r278197/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
===================================================================
--- gcc-7.5.0+r278197.orig/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
+++ gcc-7.5.0+r278197/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
@@ -1145,8 +1145,9 @@ CHECK_SIZE_AND_OFFSET(ipc_perm, uid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
-#if !defined(__aarch64__) || !SANITIZER_LINUX || __GLIBC_PREREQ (2, 21)
-/* On aarch64 glibc 2.20 and earlier provided incorrect mode field.  */
+#if !SANITIZER_LINUX || __GLIBC_PREREQ (2, 31)
+/* glibc 2.30 and earlier provided 16-bit mode field instead of 32-bit
+   on many architectures.  */
 CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
 #endif
 
Index: gcc-7.5.0+r278197/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
===================================================================
--- gcc-7.5.0+r278197.orig/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
+++ gcc-7.5.0+r278197/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -204,27 +204,14 @@ namespace __sanitizer {
     unsigned __seq;
     u64 __unused1;
     u64 __unused2;
-#elif defined(__mips__) || defined(__aarch64__) || defined(__s390x__)
-    unsigned int mode;
-    unsigned short __seq;
-    unsigned short __pad1;
-    unsigned long __unused1;
-    unsigned long __unused2;
 #elif defined(__sparc__)
-# if defined(__arch64__)
     unsigned mode;
-    unsigned short __pad1;
-# else
-    unsigned short __pad1;
-    unsigned short mode;
     unsigned short __pad2;
-# endif
     unsigned short __seq;
     unsigned long long __unused1;
     unsigned long long __unused2;
 #else
-    unsigned short mode;
-    unsigned short __pad1;
+    unsigned int mode;
     unsigned short __seq;
     unsigned short __pad2;
 #if defined(__x86_64__) && !defined(_LP64)