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Partial backport of:
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commit 333221862ecbebde60dd16e7ca17d26444e62f50
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Mon Apr 8 11:19:38 2019 +0200
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resolv: Remove RES_INSECURE1, RES_INSECURE2
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Always perform the associated security checks.
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The constants and their debug output handling are preserved in this
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backport.
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diff --git a/resolv/res_send.c b/resolv/res_send.c
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index 705ecb7189d215c2..c9b02cca130bc20d 100644
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--- a/resolv/res_send.c
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+++ b/resolv/res_send.c
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@@ -1324,31 +1324,25 @@ send_dg(res_state statp,
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*/
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goto wait;
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}
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- if (!(statp->options & RES_INSECURE1) &&
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- !res_ourserver_p(statp, &from)) {
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- /*
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- * response from wrong server? ignore it.
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- * XXX - potential security hazard could
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- * be detected here.
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- */
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- goto wait;
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- }
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- if (!(statp->options & RES_INSECURE2)
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- && (recvresp1 || !res_queriesmatch(buf, buf + buflen,
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+
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+ /* Paranoia check. Due to the connected UDP socket,
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+ the kernel has already filtered invalid addresses
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+ for us. */
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+ if (!res_ourserver_p(statp, &from))
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+ goto wait;
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+
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+ /* Check for the correct header layout and a matching
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+ question. */
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+ if ((recvresp1 || !res_queriesmatch(buf, buf + buflen,
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*thisansp,
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*thisansp
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+ *thisanssizp))
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&& (recvresp2 || !res_queriesmatch(buf2, buf2 + buflen2,
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*thisansp,
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*thisansp
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- + *thisanssizp))) {
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- /*
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- * response contains wrong query? ignore it.
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- * XXX - potential security hazard could
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- * be detected here.
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- */
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- goto wait;
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- }
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+ + *thisanssizp)))
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+ goto wait;
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+
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if (anhp->rcode == SERVFAIL ||
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anhp->rcode == NOTIMP ||
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anhp->rcode == REFUSED) {
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