From 38765ab68f329fd84a5984decc8953f8c89d6e5c Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Thu, 5 Jan 2017 10:07:24 -0200 Subject: 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. --- string/strings.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'string/strings.h') 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 +# endif +#endif + #endif /* strings.h */ -- cgit v1.2.3