From 4bcef637f86773382d6d4fb15044fc14751124fa Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@courtesan.com>
Date: Wed, 13 Jan 2016 11:10:33 -0700
Subject: [PATCH] Work around the buggy pread(2) on 32-bit HP-UX 11.00 by using
 pread64() on that platform.

---
 config.h.in           | 10 ++++++++++
 configure             | 25 +++++++++++++++++++++++++
 configure.ac          | 12 ++++++++++++
 include/sudo_compat.h | 15 +++++++++++++++
 4 files changed, 62 insertions(+)

diff --git a/config.h.in b/config.h.in
index 23ab0bff6..d1a1571b1 100644
--- a/config.h.in
+++ b/config.h.in
@@ -523,6 +523,9 @@
 /* Define to 1 if you have the `pread' function. */
 #undef HAVE_PREAD
 
+/* Define to 1 if you have the `pread64' function. */
+#undef HAVE_PREAD64
+
 /* Define to 1 if you have the `priv_set' function. */
 #undef HAVE_PRIV_SET
 
@@ -541,6 +544,9 @@
 /* Define to 1 if you have the `pwrite' function. */
 #undef HAVE_PWRITE
 
+/* Define to 1 if you have the `pwrite64' function. */
+#undef HAVE_PWRITE64
+
 /* Define to 1 if you have the `pw_dup' function. */
 #undef HAVE_PW_DUP
 
@@ -1089,6 +1095,10 @@
 /* Number of bits in a file offset, on hosts where this is settable. */
 #undef _FILE_OFFSET_BITS
 
+/* Define to 1 to enable 64-bit versions of standard C functions on 32-bit
+   systems. */
+#undef _LARGEFILE64_SOURCE
+
 /* Define for large files, on AIX-style hosts. */
 #undef _LARGE_FILES
 
diff --git a/configure b/configure
index de475d93f..71efab53b 100755
--- a/configure
+++ b/configure
@@ -18081,6 +18081,31 @@ done
 
 
 
+case "$host_os" in
+    hpux*)
+	if test X"$ac_cv_func_pread" = X"yes"; then
+	    O_CPPFLAGS="$CPPFLAGS"
+	    CPPFLAGS="$CPPFLAGS -D_LARGEFILE64_SOURCE"
+	    for ac_func in pread64 pwrite64
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+
+$as_echo "#define _LARGEFILE64_SOURCE 1" >>confdefs.h
+
+
+fi
+done
+
+	    CPPFLAGS="$O_CPPFLAGS"
+	fi
+	;;
+esac
 for ac_func in getgrouplist
 do :
   ac_fn_c_check_func "$LINENO" "getgrouplist" "ac_cv_func_getgrouplist"
diff --git a/configure.ac b/configure.ac
index 481433c68..f50deeeee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2385,6 +2385,18 @@ dnl Function checks
 dnl
 AC_FUNC_GETGROUPS
 AC_CHECK_FUNCS_ONCE([fexecve killpg nl_langinfo strftime pread pwrite openat])
+case "$host_os" in
+    hpux*)
+	if test X"$ac_cv_func_pread" = X"yes"; then
+	    O_CPPFLAGS="$CPPFLAGS"
+	    CPPFLAGS="$CPPFLAGS -D_LARGEFILE64_SOURCE"
+	    AC_CHECK_FUNCS([pread64 pwrite64], [
+		AC_DEFINE([_LARGEFILE64_SOURCE], [1], [Define to 1 to enable 64-bit versions of standard C functions on 32-bit systems.])
+	    ])
+	    CPPFLAGS="$O_CPPFLAGS"
+	fi
+	;;
+esac
 AC_CHECK_FUNCS([getgrouplist], [], [
     case "$host_os" in
     aix*)
diff --git a/include/sudo_compat.h b/include/sudo_compat.h
index 8ca8d5ba0..8c6edf845 100644
--- a/include/sudo_compat.h
+++ b/include/sudo_compat.h
@@ -324,6 +324,21 @@ int _innetgr(const char *, const char *, const char *, const char *);
 int getdomainname(char *, size_t);
 #endif
 
+/*
+ * HP-UX 11.00 has broken pread/pwrite that can't handle a 64-bit off_t
+ * on 32-bit machines.
+ */
+#if defined(__hpux) && !defined(__LP64__)
+# ifdef HAVE_PREAD64
+#  undef pread
+#  define pread(_a, _b, _c, _d) pread64((_a), (_b), (_c), (_d))
+# endif
+# ifdef HAVE_PWRITE64
+#  undef pwrite
+#  define pwrite(_a, _b, _c, _d) pwrite64((_a), (_b), (_c), (_d))
+# endif
+#endif /* __hpux && !__LP64__ */
+
 /* We wrap OpenBSD's strtonum() to get translatable error strings. */
 __dso_public long long sudo_strtonum(const char *, long long, long long, const char **);
 #undef strtonum
-- 
2.40.0