From 2a3224c53653214cbba2ec23424702193c80ea3b Mon Sep 17 00:00:00 2001
From: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Wed, 30 Dec 2020 11:09:58 +0530
Subject: string: Enable __FORTIFY_LEVEL=3

This change enhances fortified string functions to use
__builtin_dynamic_object_size under _FORTIFY_SOURCE=3 whenever the
compiler supports it.
---
 string/bits/string_fortified.h  | 29 ++++++++++++++++++-----------
 string/bits/strings_fortified.h |  6 ++++--
 2 files changed, 22 insertions(+), 13 deletions(-)

(limited to 'string')

diff --git a/string/bits/string_fortified.h b/string/bits/string_fortified.h
index 4c1aeb4..92d75f1 100644
--- a/string/bits/string_fortified.h
+++ b/string/bits/string_fortified.h
@@ -26,13 +26,15 @@ __fortify_function void *
 __NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
 	       size_t __len))
 {
-  return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
+  return __builtin___memcpy_chk (__dest, __src, __len,
+				 __glibc_objsize0 (__dest));
 }
 
 __fortify_function void *
 __NTH (memmove (void *__dest, const void *__src, size_t __len))
 {
-  return __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
+  return __builtin___memmove_chk (__dest, __src, __len,
+				  __glibc_objsize0 (__dest));
 }
 
 #ifdef __USE_GNU
@@ -40,7 +42,8 @@ __fortify_function void *
 __NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
 		size_t __len))
 {
-  return __builtin___mempcpy_chk (__dest, __src, __len, __bos0 (__dest));
+  return __builtin___mempcpy_chk (__dest, __src, __len,
+				  __glibc_objsize0 (__dest));
 }
 #endif
 
@@ -53,7 +56,8 @@ __NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
 __fortify_function void *
 __NTH (memset (void *__dest, int __ch, size_t __len))
 {
-  return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
+  return __builtin___memset_chk (__dest, __ch, __len,
+				 __glibc_objsize0 (__dest));
 }
 
 #ifdef __USE_MISC
@@ -65,21 +69,21 @@ void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
 __fortify_function void
 __NTH (explicit_bzero (void *__dest, size_t __len))
 {
-  __explicit_bzero_chk (__dest, __len, __bos0 (__dest));
+  __explicit_bzero_chk (__dest, __len, __glibc_objsize0 (__dest));
 }
 #endif
 
 __fortify_function char *
 __NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
 {
-  return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
+  return __builtin___strcpy_chk (__dest, __src, __glibc_objsize (__dest));
 }
 
 #ifdef __USE_GNU
 __fortify_function char *
 __NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
 {
-  return __builtin___stpcpy_chk (__dest, __src, __bos (__dest));
+  return __builtin___stpcpy_chk (__dest, __src, __glibc_objsize (__dest));
 }
 #endif
 
@@ -88,14 +92,16 @@ __fortify_function char *
 __NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
 		size_t __len))
 {
-  return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
+  return __builtin___strncpy_chk (__dest, __src, __len,
+				  __glibc_objsize (__dest));
 }
 
 #if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
 __fortify_function char *
 __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
 {
-  return __builtin___stpncpy_chk (__dest, __src, __n, __bos (__dest));
+  return __builtin___stpncpy_chk (__dest, __src, __n,
+				  __glibc_objsize (__dest));
 }
 #else
 extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
@@ -118,7 +124,7 @@ __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
 __fortify_function char *
 __NTH (strcat (char *__restrict __dest, const char *__restrict __src))
 {
-  return __builtin___strcat_chk (__dest, __src, __bos (__dest));
+  return __builtin___strcat_chk (__dest, __src, __glibc_objsize (__dest));
 }
 
 
@@ -126,7 +132,8 @@ __fortify_function char *
 __NTH (strncat (char *__restrict __dest, const char *__restrict __src,
 		size_t __len))
 {
-  return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
+  return __builtin___strncat_chk (__dest, __src, __len,
+				  __glibc_objsize (__dest));
 }
 
 #endif /* bits/string_fortified.h */
diff --git a/string/bits/strings_fortified.h b/string/bits/strings_fortified.h
index d4091f4..7752faf 100644
--- a/string/bits/strings_fortified.h
+++ b/string/bits/strings_fortified.h
@@ -22,13 +22,15 @@
 __fortify_function void
 __NTH (bcopy (const void *__src, void *__dest, size_t __len))
 {
-  (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
+  (void) __builtin___memmove_chk (__dest, __src, __len,
+				  __glibc_objsize0 (__dest));
 }
 
 __fortify_function void
 __NTH (bzero (void *__dest, size_t __len))
 {
-  (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
+  (void) __builtin___memset_chk (__dest, '\0', __len,
+				 __glibc_objsize0 (__dest));
 }
 
 #endif
-- 
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