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36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
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Original patch from: gentoo/src/patchsets/glibc/2.9/0050_all_glibc-_nss_dns_gethostbyaddr2_r-check-and-adjust-the-buffer-alignment.patch
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-= BEGIN original header =-
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http://sourceware.org/ml/libc-alpha/2009-01/msg00000.html
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From 8ad7030880eaa18dcabf8e284e79026301fd3fa4 Mon Sep 17 00:00:00 2001
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From: Ulrich Drepper <drepper@redhat.com>
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Date: Thu, 8 Jan 2009 00:02:38 +0000
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Subject: [PATCH] (_nss_dns_gethostbyaddr2_r): Check and adjust the buffer alignment.
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-= END original header =-
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diff -durN glibc-2_9.orig/resolv/nss_dns/dns-host.c glibc-2_9/resolv/nss_dns/dns-host.c
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--- glibc-2_9.orig/resolv/nss_dns/dns-host.c 2008-11-12 08:52:20.000000000 +0100
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+++ glibc-2_9/resolv/nss_dns/dns-host.c 2009-02-02 22:00:36.000000000 +0100
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@@ -364,6 +364,19 @@
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int n, status;
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int olderr = errno;
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+ uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data);
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+ buffer += pad;
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+ buflen = buflen > pad ? buflen - pad : 0;
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+
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+ if (__builtin_expect (buflen < sizeof (struct host_data), 0))
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+ {
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+ *errnop = ERANGE;
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+ *h_errnop = NETDB_INTERNAL;
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+ return NSS_STATUS_TRYAGAIN;
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+ }
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+
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+ host_data = (struct host_data *) buffer;
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+
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if (__res_maybe_init (&_res, 0) == -1)
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return NSS_STATUS_UNAVAIL;
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