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Fix reply buffer mismanagement in resolver (#730856)

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This commit is contained in:
Jeff Law 2012-02-16 23:01:37 -07:00
parent 47621c91be
commit 817ee79b35
2 changed files with 57 additions and 15 deletions
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64
glibc-rh730856.patch
View File

@ -1,16 +1,52 @@
2011-09-01 Andreas Schwab <schwab@redhat.com>
* resolv/res_query.c (__libc_res_nquery): Update assertion.
diff -ru a/resolv/res_query.c b/resolv/res_query.c
--- a/resolv/res_query.c 2011-12-12 14:10:52.000000000 -0700
+++ b/resolv/res_query.c 2011-12-12 14:23:04.832739111 -0700
@@ -248,7 +248,7 @@
&& *resplen2 > (int) sizeof (HEADER))
diff -rup a/resolv/res_query.c b/resolv/res_query.c
--- a/resolv/res_query.c 2012-02-16 22:51:17.451796009 -0700
+++ b/resolv/res_query.c 2012-02-16 22:54:42.522623598 -0700
@@ -122,6 +122,7 @@ __libc_res_nquery(res_state statp,
int *resplen2)
{
HEADER *hp = (HEADER *) answer;
+ HEADER *hp2;
int n, use_malloc = 0;
u_int oflags = statp->_flags;
@@ -239,26 +240,25 @@ __libc_res_nquery(res_state statp,
/* __libc_res_nsend might have reallocated the buffer. */
hp = (HEADER *) *answerp;
- /* We simplify the following tests by assigning HP to HP2. It
- is easy to verify that this is the same as ignoring all
- tests of HP2. */
- HEADER *hp2 = answerp2 ? (HEADER *) *answerp2 : hp;
-
- if (n < (int) sizeof (HEADER) && answerp2 != NULL
- && *resplen2 > (int) sizeof (HEADER))
+ /* We simplify the following tests by assigning HP to HP2 or
+ vice versa. It is easy to verify that this is the same as
+ ignoring all tests of HP or HP2. */
+ if (answerp2 == NULL || *resplen2 < (int) sizeof (HEADER))
{
/* Special case of partial answer. */
- assert (hp != hp2);
+ assert (n == 0 || hp != hp2);
hp = hp2;
- /* Special case of partial answer. */
- assert (n == 0 || hp != hp2);
- hp = hp2;
+ hp2 = hp;
}
else if (answerp2 != NULL && *resplen2 < (int) sizeof (HEADER)
- else if (answerp2 != NULL && *resplen2 < (int) sizeof (HEADER)
- && n > (int) sizeof (HEADER))
+ else
{
- /* Special case of partial answer. */
- assert (hp != hp2);
- hp2 = hp;
+ hp2 = (HEADER *) *answerp2;
+ if (n < (int) sizeof (HEADER))
+ {
+ hp = hp2;
+ }
}
+ /* Make sure both hp and hp2 are defined */
+ assert((hp != NULL) && (hp2 != NULL));
+
if ((hp->rcode != NOERROR || ntohs(hp->ancount) == 0)
&& (hp2->rcode != NOERROR || ntohs(hp2->ancount) == 0)) {
#ifdef DEBUG

8
glibc.spec
View File

@ -28,7 +28,7 @@
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: 18%{?dist}
Release: 19%{?dist}
# GPLv2+ is used in a bunch of programs, LGPLv2+ is used for libraries.
# Things that are linked directly into dynamically linked programs
# and shared libraries (e.g. crt files, lib*_nonshared.a) have an additional
@ -90,6 +90,8 @@ Patch27: %{name}-rh564528.patch
Patch28: %{name}-rh790292.patch
Patch29: %{name}-rh790298.patch
Patch30: %{name}-rh791161.patch
# Aurelien submitted upstream, Uli has largely ignored
Patch31 : %{name}-rh730856.patch
Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@ -339,6 +341,7 @@ rm -rf %{glibcportsdir}
%patch28 -p1
%patch29 -p1
%patch30 -p1
%patch31 -p1
# A lot of programs still misuse memcpy when they have to use
# memmove. The memcpy implementation below is not tolerant at
@ -1191,6 +1194,9 @@ rm -f *.filelist*
%endif
%changelog
* Fri Feb 17 2012 Jeff Law <law@redhat.com> - 2.15-19
- Fix reply buffer mismanagement in resolver (#730856)
* Thu Feb 16 2012 Jeff Law <law@redhat.com> - 2.15-18
- Revert 552960/769421 changes again, still causing problems.
- Add doi_IN (#791161)