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misc/sys/cdefs.h: Create FORTIFY redirects for internal calls
The __REDIRECT* macros are creating aliases which may lead to unwanted PLT entries when fortification is enabled. To prevent these entries, the REDIRECT alias should be set to point to the existing __GI_* aliases. This is done transparently by creating a __REDIRECT_FORTIFY* version of these macros, that can be overwritten internally when necessary. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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@ -40,6 +40,20 @@ rtld_hidden_proto (__chk_fail)
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#endif
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#if defined SHARED
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#if IS_IN (libc) && __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
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#undef __REDIRECT_FORTIFY
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#define __REDIRECT_FORTIFY(name, proto, alias) \
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__REDIRECT(name, proto, __GI_##alias)
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#undef __REDIRECT_FORTIFY_NTH
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#define __REDIRECT_FORTIFY_NTH(name, proto, alias) \
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__REDIRECT_NTH(name, proto, __GI_##alias)
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#endif
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#endif /* defined SHARED */
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#endif /* !defined _ISOMAC */
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#endif
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@ -268,6 +268,14 @@
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# define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
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# define __ASMNAME2(prefix, cname) __STRING (prefix) cname
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#ifndef __REDIRECT_FORTIFY
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#define __REDIRECT_FORTIFY __REDIRECT
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#endif
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#ifndef __REDIRECT_FORTIFY_NTH
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#define __REDIRECT_FORTIFY_NTH __REDIRECT_NTH
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#endif
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/*
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#elif __SOME_OTHER_COMPILER__
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