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commit 13e70b397dcb0d1bf4a869b670f041c1d7b730d0
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Author: Björn Esser <besser82@fedoraproject.org>
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Date:   Sat Jan 20 20:22:53 2018 +0100
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    pp: Guard fix for really old bug in glibc libcrypt
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diff --git a/pp.c b/pp.c
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index d50ad7ddbf..6510c7b15c 100644
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--- a/pp.c
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+++ b/pp.c
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@@ -3650,8 +3650,12 @@ PP(pp_crypt)
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 #if defined(__GLIBC__) || defined(__EMX__)
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 	if (PL_reentrant_buffer->_crypt_struct_buffer) {
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 	    PL_reentrant_buffer->_crypt_struct_buffer->initialized = 0;
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-	    /* work around glibc-2.2.5 bug */
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+#if (defined(__GLIBC__) && __GLIBC__ == 2) && \
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+    (defined(__GLIBC_MINOR__) && __GLIBC_MINOR__ >= 2 && __GLIBC_MINOR__ < 4)
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+	    /* work around glibc-2.2.5 bug, has been fixed at some
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+	     * time in glibc-2.3.X */
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 	    PL_reentrant_buffer->_crypt_struct_buffer->current_saltbits = 0;
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+#endif
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 	}
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 #endif
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     }