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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-01-05 10:07:24 -0200
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-01-05 15:54:13 -0200
commit38765ab68f329fd84a5984decc8953f8c89d6e5c (patch)
treef5796bc5f6881805b7f9b2e02d3734a03bf03ed9
parent983a9637f730fa265e228509d090c4c5f031d713 (diff)
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Use fortify macros for b{zero,copy} along decl from strings.h
As described in BZ#20558, bzero and bcopy declaration can only benefit from fortified macros when decl came from string.h and when __USE_MISC is defined (default behaviour). This is due no standard includes those functions in string.h, so they are only declared if __USE_MISC is defined (as pointed out in comment 4). However fortification should be orthogona to other features test macros, i.e, any function should be fortified if that function is declared. To fix this behavior, the patch moved the bzero, bcopy, and __explicit_bzero_chk to a common header (string/bits/strings_fortified.h) and explicit fortified inclusion macros similar to string.h is added on strings.h. This allows to get fortified declarions by only including strings.h. Checked on x86_64-linux-gnu and along on a bootstrap installation to check if the fortified are correctly triggered with example from bug report. [BZ #20558] * string/bits/string3.h [__USE_MISC] (bcopy): Move to strings_fortified.h. [__USE_MISC] (bzero): Likewise. [__USE_MISC] (explicit_bzero): Likewise. * string/strings.h: Include strings_fortified.h. * string/Makefile (headers): Add strings_fortified.h. * string/bits/strings_fortified.h: New file. * include/bits/strings_fortified.h: Likewise.
-rw-r--r--ChangeLog12
-rw-r--r--include/bits/strings_fortified.h1
-rw-r--r--string/Makefile3
-rw-r--r--string/bits/string3.h21
-rw-r--r--string/bits/strings_fortified.h43
-rw-r--r--string/strings.h8
6 files changed, 67 insertions, 21 deletions
diff --git a/ChangeLog b/ChangeLog
index 88f9f068f4..c67476fca5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2017-01-05 Adhemerval Zanella <adhemerval.zanella@linaro.org>
+
+ [BZ #20558]
+ * string/bits/string3.h [__USE_MISC] (bcopy): Move to
+ strings_fortified.h.
+ [__USE_MISC] (bzero): Likewise.
+ [__USE_MISC] (explicit_bzero): Likewise.
+ * string/strings.h: Include strings_fortified.h.
+ * string/Makefile (headers): Add strings_fortified.h.
+ * string/bits/strings_fortified.h: New file.
+ * include/bits/strings_fortified.h: Likewise.
+
2017-01-05 Joseph Myers <joseph@codesourcery.com>
* elf/tst-tls13.c (TIMEOUT): Remove.
diff --git a/include/bits/strings_fortified.h b/include/bits/strings_fortified.h
new file mode 100644
index 0000000000..77219c162c
--- /dev/null
+++ b/include/bits/strings_fortified.h
@@ -0,0 +1 @@
+#include <string/bits/strings_fortified.h>
diff --git a/string/Makefile b/string/Makefile
index aaa371f6b6..04e9da951e 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -24,7 +24,8 @@ include ../Makeconfig
headers := string.h strings.h memory.h endian.h bits/endian.h \
argz.h envz.h byteswap.h bits/byteswap.h bits/byteswap-16.h \
- bits/string.h bits/string2.h bits/string3.h
+ bits/string.h bits/string2.h bits/string3.h \
+ bits/strings_fortified.h
routines := strcat strchr strcmp strcoll strcpy strcspn \
strverscmp strdup strndup \
diff --git a/string/bits/string3.h b/string/bits/string3.h
index fe0c161390..0b0a37744a 100644
--- a/string/bits/string3.h
+++ b/string/bits/string3.h
@@ -91,26 +91,7 @@ __NTH (memset (void *__dest, int __ch, size_t __len))
}
#ifdef __USE_MISC
-__fortify_function void
-__NTH (bcopy (const void *__src, void *__dest, size_t __len))
-{
- (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
-}
-
-__fortify_function void
-__NTH (bzero (void *__dest, size_t __len))
-{
- (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
-}
-
-void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
- __THROW __nonnull ((1));
-
-__fortify_function void
-__NTH (explicit_bzero (void *__dest, size_t __len))
-{
- __explicit_bzero_chk (__dest, __len, __bos0 (__dest));
-}
+# include <bits/strings_fortified.h>
#endif
__fortify_function char *
diff --git a/string/bits/strings_fortified.h b/string/bits/strings_fortified.h
new file mode 100644
index 0000000000..fd396f9f3c
--- /dev/null
+++ b/string/bits/strings_fortified.h
@@ -0,0 +1,43 @@
+/* Fortify macros for strings.h functions.
+ Copyright (C) 2017 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef __STRINGS_FORTIFIED
+# define __STRINGS_FORTIFIED 1
+
+__fortify_function void
+__NTH (bcopy (const void *__src, void *__dest, size_t __len))
+{
+ (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
+}
+
+__fortify_function void
+__NTH (bzero (void *__dest, size_t __len))
+{
+ (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
+}
+
+void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
+ __THROW __nonnull ((1));
+
+__fortify_function void
+__NTH (explicit_bzero (void *__dest, size_t __len))
+{
+ __explicit_bzero_chk (__dest, __len, __bos0 (__dest));
+}
+
+#endif
diff --git a/string/strings.h b/string/strings.h
index ece21c8c7e..69b75b1219 100644
--- a/string/strings.h
+++ b/string/strings.h
@@ -136,4 +136,12 @@ __END_DECLS
#endif /* string.h */
+#if __GNUC_PREREQ (3,4) && __USE_FORTIFY_LEVEL > 0 \
+ && defined __fortify_function
+/* Functions with security checks. */
+# if defined __USE_MISC || !defined __USE_XOPEN2K8
+# include <bits/strings_fortified.h>
+# endif
+#endif
+
#endif /* strings.h */