From a10da9c455e9ae6edd4d1977bbecc86dd1cb083d Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Fri, 15 Sep 2023 15:11:13 -0400 Subject: [PATCH] CVE-2023-4813: potential use-after-free in gaih_inet Resolves: RHEL-2438 --- glibc-RHEL-2438.patch | 973 ++++++++++++++++++++++++++++++++++++++++++ glibc.spec | 6 +- 2 files changed, 978 insertions(+), 1 deletion(-) create mode 100644 glibc-RHEL-2438.patch diff --git a/glibc-RHEL-2438.patch b/glibc-RHEL-2438.patch new file mode 100644 index 0000000..46f1c9a --- /dev/null +++ b/glibc-RHEL-2438.patch @@ -0,0 +1,973 @@ +commit 1c37b8022e8763fedbb3f79c02e05c6acfe5a215 +Author: Siddhesh Poyarekar +Date: Thu Mar 17 11:44:34 2022 +0530 + + Simplify allocations and fix merge and continue actions [BZ #28931] + + Allocations for address tuples is currently a bit confusing because of + the pointer chasing through PAT, making it hard to observe the sequence + in which allocations have been made. Narrow scope of the pointer + chasing through PAT so that it is only used where necessary. + + This also tightens actions behaviour with the hosts database in + getaddrinfo to comply with the manual text. The "continue" action + discards previous results and the "merge" action results in an immedate + lookup failure. Consequently, chaining of allocations across modules is + no longer necessary, thus opening up cleanup opportunities. + + A test has been added that checks some combinations to ensure that they + work correctly. + + Resolves: BZ #28931 + + Signed-off-by: Siddhesh Poyarekar + Reviewed-by: DJ Delorie + +Conflicts: + nss/Makefile + (Tests applied in different order from upstream) + +diff --git a/nss/Makefile b/nss/Makefile +index f01674a16e720b88..333edb1588ede881 100644 +--- a/nss/Makefile ++++ b/nss/Makefile +@@ -77,6 +77,7 @@ tests-container := \ + tst-nss-db-endpwent \ + tst-nss-files-hosts-long \ + tst-nss-files-hosts-v4mapped \ ++ tst-nss-gai-actions \ + tst-nss-test3 \ + tst-reload1 \ + tst-reload2 \ +diff --git a/nss/tst-nss-gai-actions.c b/nss/tst-nss-gai-actions.c +new file mode 100644 +index 0000000000000000..efca6cd1837a172a +--- /dev/null ++++ b/nss/tst-nss-gai-actions.c +@@ -0,0 +1,149 @@ ++/* Test continue and merge NSS actions for getaddrinfo. ++ Copyright The GNU Toolchain Authors. ++ This file is part of the GNU C Library. ++ ++ The GNU C Library is free software; you can redistribute it and/or ++ modify it under the terms of the GNU Lesser General Public ++ License as published by the Free Software Foundation; either ++ version 2.1 of the License, or (at your option) any later version. ++ ++ The GNU C Library is distributed in the hope that it will be useful, ++ but WITHOUT ANY WARRANTY; without even the implied warranty of ++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ++ Lesser General Public License for more details. ++ ++ You should have received a copy of the GNU Lesser General Public ++ License along with the GNU C Library; if not, see ++ . */ ++ ++#include ++#include ++#include ++#include ++#include ++#include ++ ++#include ++#include ++#include ++#include ++#include ++ ++enum ++{ ++ ACTION_MERGE = 0, ++ ACTION_CONTINUE, ++}; ++ ++static const char * ++family_str (int family) ++{ ++ switch (family) ++ { ++ case AF_UNSPEC: ++ return "AF_UNSPEC"; ++ case AF_INET: ++ return "AF_INET"; ++ default: ++ __builtin_unreachable (); ++ } ++} ++ ++static const char * ++action_str (int action) ++{ ++ switch (action) ++ { ++ case ACTION_MERGE: ++ return "merge"; ++ case ACTION_CONTINUE: ++ return "continue"; ++ default: ++ __builtin_unreachable (); ++ } ++} ++ ++static void ++do_one_test (int action, int family, bool canon) ++{ ++ struct addrinfo hints = ++ { ++ .ai_family = family, ++ }; ++ ++ struct addrinfo *ai; ++ ++ if (canon) ++ hints.ai_flags = AI_CANONNAME; ++ ++ printf ("***** Testing \"files [SUCCESS=%s] files\" for family %s, %s\n", ++ action_str (action), family_str (family), ++ canon ? "AI_CANONNAME" : ""); ++ ++ int ret = getaddrinfo ("example.org", "80", &hints, &ai); ++ ++ switch (action) ++ { ++ case ACTION_MERGE: ++ if (ret == 0) ++ { ++ char *formatted = support_format_addrinfo (ai, ret); ++ ++ printf ("merge unexpectedly succeeded:\n %s\n", formatted); ++ support_record_failure (); ++ free (formatted); ++ } ++ else ++ return; ++ case ACTION_CONTINUE: ++ { ++ char *formatted = support_format_addrinfo (ai, ret); ++ ++ /* Verify that the result appears exactly once. */ ++ const char *expected = "address: STREAM/TCP 192.0.0.1 80\n" ++ "address: DGRAM/UDP 192.0.0.1 80\n" ++ "address: RAW/IP 192.0.0.1 80\n"; ++ ++ const char *contains = strstr (formatted, expected); ++ const char *contains2 = NULL; ++ ++ if (contains != NULL) ++ contains2 = strstr (contains + strlen (expected), expected); ++ ++ if (contains == NULL || contains2 != NULL) ++ { ++ printf ("continue failed:\n%s\n", formatted); ++ support_record_failure (); ++ } ++ ++ free (formatted); ++ break; ++ } ++ default: ++ __builtin_unreachable (); ++ } ++} ++ ++static void ++do_one_test_set (int action) ++{ ++ char buf[32]; ++ ++ snprintf (buf, sizeof (buf), "files [SUCCESS=%s] files", ++ action_str (action)); ++ __nss_configure_lookup ("hosts", buf); ++ ++ do_one_test (action, AF_UNSPEC, false); ++ do_one_test (action, AF_INET, false); ++ do_one_test (action, AF_INET, true); ++} ++ ++static int ++do_test (void) ++{ ++ do_one_test_set (ACTION_CONTINUE); ++ do_one_test_set (ACTION_MERGE); ++ return 0; ++} ++ ++#include +diff --git a/nss/tst-nss-gai-actions.root/etc/host.conf b/nss/tst-nss-gai-actions.root/etc/host.conf +new file mode 100644 +index 0000000000000000..d1a59f73a90f2993 +--- /dev/null ++++ b/nss/tst-nss-gai-actions.root/etc/host.conf +@@ -0,0 +1 @@ ++multi on +diff --git a/nss/tst-nss-gai-actions.root/etc/hosts b/nss/tst-nss-gai-actions.root/etc/hosts +new file mode 100644 +index 0000000000000000..50ce9774dc2c21d9 +--- /dev/null ++++ b/nss/tst-nss-gai-actions.root/etc/hosts +@@ -0,0 +1,508 @@ ++192.0.0.1 example.org ++192.0.0.2 example.org ++192.0.0.3 example.org ++192.0.0.4 example.org ++192.0.0.5 example.org ++192.0.0.6 example.org ++192.0.0.7 example.org ++192.0.0.8 example.org ++192.0.0.9 example.org ++192.0.0.10 example.org ++192.0.0.11 example.org ++192.0.0.12 example.org ++192.0.0.13 example.org ++192.0.0.14 example.org ++192.0.0.15 example.org ++192.0.0.16 example.org ++192.0.0.17 example.org ++192.0.0.18 example.org ++192.0.0.19 example.org ++192.0.0.20 example.org ++192.0.0.21 example.org ++192.0.0.22 example.org ++192.0.0.23 example.org ++192.0.0.24 example.org ++192.0.0.25 example.org ++192.0.0.26 example.org ++192.0.0.27 example.org ++192.0.0.28 example.org ++192.0.0.29 example.org ++192.0.0.30 example.org ++192.0.0.31 example.org ++192.0.0.32 example.org ++192.0.0.33 example.org ++192.0.0.34 example.org ++192.0.0.35 example.org ++192.0.0.36 example.org ++192.0.0.37 example.org ++192.0.0.38 example.org ++192.0.0.39 example.org ++192.0.0.40 example.org ++192.0.0.41 example.org ++192.0.0.42 example.org ++192.0.0.43 example.org ++192.0.0.44 example.org ++192.0.0.45 example.org ++192.0.0.46 example.org ++192.0.0.47 example.org ++192.0.0.48 example.org ++192.0.0.49 example.org ++192.0.0.50 example.org ++192.0.0.51 example.org ++192.0.0.52 example.org ++192.0.0.53 example.org ++192.0.0.54 example.org ++192.0.0.55 example.org ++192.0.0.56 example.org ++192.0.0.57 example.org ++192.0.0.58 example.org ++192.0.0.59 example.org ++192.0.0.60 example.org ++192.0.0.61 example.org ++192.0.0.62 example.org ++192.0.0.63 example.org ++192.0.0.64 example.org ++192.0.0.65 example.org ++192.0.0.66 example.org ++192.0.0.67 example.org ++192.0.0.68 example.org ++192.0.0.69 example.org ++192.0.0.70 example.org ++192.0.0.71 example.org ++192.0.0.72 example.org ++192.0.0.73 example.org ++192.0.0.74 example.org ++192.0.0.75 example.org ++192.0.0.76 example.org ++192.0.0.77 example.org ++192.0.0.78 example.org ++192.0.0.79 example.org ++192.0.0.80 example.org ++192.0.0.81 example.org ++192.0.0.82 example.org ++192.0.0.83 example.org ++192.0.0.84 example.org ++192.0.0.85 example.org ++192.0.0.86 example.org ++192.0.0.87 example.org ++192.0.0.88 example.org ++192.0.0.89 example.org ++192.0.0.90 example.org ++192.0.0.91 example.org ++192.0.0.92 example.org ++192.0.0.93 example.org ++192.0.0.94 example.org ++192.0.0.95 example.org ++192.0.0.96 example.org ++192.0.0.97 example.org ++192.0.0.98 example.org ++192.0.0.99 example.org ++192.0.0.100 example.org ++192.0.0.101 example.org ++192.0.0.102 example.org ++192.0.0.103 example.org ++192.0.0.104 example.org ++192.0.0.105 example.org ++192.0.0.106 example.org ++192.0.0.107 example.org ++192.0.0.108 example.org ++192.0.0.109 example.org ++192.0.0.110 example.org ++192.0.0.111 example.org ++192.0.0.112 example.org ++192.0.0.113 example.org ++192.0.0.114 example.org ++192.0.0.115 example.org ++192.0.0.116 example.org ++192.0.0.117 example.org ++192.0.0.118 example.org ++192.0.0.119 example.org ++192.0.0.120 example.org ++192.0.0.121 example.org ++192.0.0.122 example.org ++192.0.0.123 example.org ++192.0.0.124 example.org ++192.0.0.125 example.org ++192.0.0.126 example.org ++192.0.0.127 example.org ++192.0.0.128 example.org ++192.0.0.129 example.org ++192.0.0.130 example.org ++192.0.0.131 example.org ++192.0.0.132 example.org ++192.0.0.133 example.org ++192.0.0.134 example.org ++192.0.0.135 example.org ++192.0.0.136 example.org ++192.0.0.137 example.org ++192.0.0.138 example.org ++192.0.0.139 example.org ++192.0.0.140 example.org ++192.0.0.141 example.org ++192.0.0.142 example.org ++192.0.0.143 example.org ++192.0.0.144 example.org ++192.0.0.145 example.org ++192.0.0.146 example.org ++192.0.0.147 example.org ++192.0.0.148 example.org ++192.0.0.149 example.org ++192.0.0.150 example.org ++192.0.0.151 example.org ++192.0.0.152 example.org ++192.0.0.153 example.org ++192.0.0.154 example.org ++192.0.0.155 example.org ++192.0.0.156 example.org ++192.0.0.157 example.org ++192.0.0.158 example.org ++192.0.0.159 example.org ++192.0.0.160 example.org ++192.0.0.161 example.org ++192.0.0.162 example.org ++192.0.0.163 example.org ++192.0.0.164 example.org ++192.0.0.165 example.org ++192.0.0.166 example.org ++192.0.0.167 example.org ++192.0.0.168 example.org ++192.0.0.169 example.org ++192.0.0.170 example.org ++192.0.0.171 example.org ++192.0.0.172 example.org ++192.0.0.173 example.org ++192.0.0.174 example.org ++192.0.0.175 example.org ++192.0.0.176 example.org ++192.0.0.177 example.org ++192.0.0.178 example.org ++192.0.0.179 example.org ++192.0.0.180 example.org ++192.0.0.181 example.org ++192.0.0.182 example.org ++192.0.0.183 example.org ++192.0.0.184 example.org ++192.0.0.185 example.org ++192.0.0.186 example.org ++192.0.0.187 example.org ++192.0.0.188 example.org ++192.0.0.189 example.org ++192.0.0.190 example.org ++192.0.0.191 example.org ++192.0.0.192 example.org ++192.0.0.193 example.org ++192.0.0.194 example.org ++192.0.0.195 example.org ++192.0.0.196 example.org ++192.0.0.197 example.org ++192.0.0.198 example.org ++192.0.0.199 example.org ++192.0.0.200 example.org ++192.0.0.201 example.org ++192.0.0.202 example.org ++192.0.0.203 example.org ++192.0.0.204 example.org ++192.0.0.205 example.org ++192.0.0.206 example.org ++192.0.0.207 example.org ++192.0.0.208 example.org ++192.0.0.209 example.org ++192.0.0.210 example.org ++192.0.0.211 example.org ++192.0.0.212 example.org ++192.0.0.213 example.org ++192.0.0.214 example.org ++192.0.0.215 example.org ++192.0.0.216 example.org ++192.0.0.217 example.org ++192.0.0.218 example.org ++192.0.0.219 example.org ++192.0.0.220 example.org ++192.0.0.221 example.org ++192.0.0.222 example.org ++192.0.0.223 example.org ++192.0.0.224 example.org ++192.0.0.225 example.org ++192.0.0.226 example.org ++192.0.0.227 example.org ++192.0.0.228 example.org ++192.0.0.229 example.org ++192.0.0.230 example.org ++192.0.0.231 example.org ++192.0.0.232 example.org ++192.0.0.233 example.org ++192.0.0.234 example.org ++192.0.0.235 example.org ++192.0.0.236 example.org ++192.0.0.237 example.org ++192.0.0.238 example.org ++192.0.0.239 example.org ++192.0.0.240 example.org ++192.0.0.241 example.org ++192.0.0.242 example.org ++192.0.0.243 example.org ++192.0.0.244 example.org ++192.0.0.245 example.org ++192.0.0.246 example.org ++192.0.0.247 example.org ++192.0.0.248 example.org ++192.0.0.249 example.org ++192.0.0.250 example.org ++192.0.0.251 example.org ++192.0.0.252 example.org ++192.0.0.253 example.org ++192.0.0.254 example.org ++192.0.1.1 example.org ++192.0.1.2 example.org ++192.0.1.3 example.org ++192.0.1.4 example.org ++192.0.1.5 example.org ++192.0.1.6 example.org ++192.0.1.7 example.org ++192.0.1.8 example.org ++192.0.1.9 example.org ++192.0.1.10 example.org ++192.0.1.11 example.org ++192.0.1.12 example.org ++192.0.1.13 example.org ++192.0.1.14 example.org ++192.0.1.15 example.org ++192.0.1.16 example.org ++192.0.1.17 example.org ++192.0.1.18 example.org ++192.0.1.19 example.org ++192.0.1.20 example.org ++192.0.1.21 example.org ++192.0.1.22 example.org ++192.0.1.23 example.org ++192.0.1.24 example.org ++192.0.1.25 example.org ++192.0.1.26 example.org ++192.0.1.27 example.org ++192.0.1.28 example.org ++192.0.1.29 example.org ++192.0.1.30 example.org ++192.0.1.31 example.org ++192.0.1.32 example.org ++192.0.1.33 example.org ++192.0.1.34 example.org ++192.0.1.35 example.org ++192.0.1.36 example.org ++192.0.1.37 example.org ++192.0.1.38 example.org ++192.0.1.39 example.org ++192.0.1.40 example.org ++192.0.1.41 example.org ++192.0.1.42 example.org ++192.0.1.43 example.org ++192.0.1.44 example.org ++192.0.1.45 example.org ++192.0.1.46 example.org ++192.0.1.47 example.org ++192.0.1.48 example.org ++192.0.1.49 example.org ++192.0.1.50 example.org ++192.0.1.51 example.org ++192.0.1.52 example.org ++192.0.1.53 example.org ++192.0.1.54 example.org ++192.0.1.55 example.org ++192.0.1.56 example.org ++192.0.1.57 example.org ++192.0.1.58 example.org ++192.0.1.59 example.org ++192.0.1.60 example.org ++192.0.1.61 example.org ++192.0.1.62 example.org ++192.0.1.63 example.org ++192.0.1.64 example.org ++192.0.1.65 example.org ++192.0.1.66 example.org ++192.0.1.67 example.org ++192.0.1.68 example.org ++192.0.1.69 example.org ++192.0.1.70 example.org ++192.0.1.71 example.org ++192.0.1.72 example.org ++192.0.1.73 example.org ++192.0.1.74 example.org ++192.0.1.75 example.org ++192.0.1.76 example.org ++192.0.1.77 example.org ++192.0.1.78 example.org ++192.0.1.79 example.org ++192.0.1.80 example.org ++192.0.1.81 example.org ++192.0.1.82 example.org ++192.0.1.83 example.org ++192.0.1.84 example.org ++192.0.1.85 example.org ++192.0.1.86 example.org ++192.0.1.87 example.org ++192.0.1.88 example.org ++192.0.1.89 example.org ++192.0.1.90 example.org ++192.0.1.91 example.org ++192.0.1.92 example.org ++192.0.1.93 example.org ++192.0.1.94 example.org ++192.0.1.95 example.org ++192.0.1.96 example.org ++192.0.1.97 example.org ++192.0.1.98 example.org ++192.0.1.99 example.org ++192.0.1.100 example.org ++192.0.1.101 example.org ++192.0.1.102 example.org ++192.0.1.103 example.org ++192.0.1.104 example.org ++192.0.1.105 example.org ++192.0.1.106 example.org ++192.0.1.107 example.org ++192.0.1.108 example.org ++192.0.1.109 example.org ++192.0.1.110 example.org ++192.0.1.111 example.org ++192.0.1.112 example.org ++192.0.1.113 example.org ++192.0.1.114 example.org ++192.0.1.115 example.org ++192.0.1.116 example.org ++192.0.1.117 example.org ++192.0.1.118 example.org ++192.0.1.119 example.org ++192.0.1.120 example.org ++192.0.1.121 example.org ++192.0.1.122 example.org ++192.0.1.123 example.org ++192.0.1.124 example.org ++192.0.1.125 example.org ++192.0.1.126 example.org ++192.0.1.127 example.org ++192.0.1.128 example.org ++192.0.1.129 example.org ++192.0.1.130 example.org ++192.0.1.131 example.org ++192.0.1.132 example.org ++192.0.1.133 example.org ++192.0.1.134 example.org ++192.0.1.135 example.org ++192.0.1.136 example.org ++192.0.1.137 example.org ++192.0.1.138 example.org ++192.0.1.139 example.org ++192.0.1.140 example.org ++192.0.1.141 example.org ++192.0.1.142 example.org ++192.0.1.143 example.org ++192.0.1.144 example.org ++192.0.1.145 example.org ++192.0.1.146 example.org ++192.0.1.147 example.org ++192.0.1.148 example.org ++192.0.1.149 example.org ++192.0.1.150 example.org ++192.0.1.151 example.org ++192.0.1.152 example.org ++192.0.1.153 example.org ++192.0.1.154 example.org ++192.0.1.155 example.org ++192.0.1.156 example.org ++192.0.1.157 example.org ++192.0.1.158 example.org ++192.0.1.159 example.org ++192.0.1.160 example.org ++192.0.1.161 example.org ++192.0.1.162 example.org ++192.0.1.163 example.org ++192.0.1.164 example.org ++192.0.1.165 example.org ++192.0.1.166 example.org ++192.0.1.167 example.org ++192.0.1.168 example.org ++192.0.1.169 example.org ++192.0.1.170 example.org ++192.0.1.171 example.org ++192.0.1.172 example.org ++192.0.1.173 example.org ++192.0.1.174 example.org ++192.0.1.175 example.org ++192.0.1.176 example.org ++192.0.1.177 example.org ++192.0.1.178 example.org ++192.0.1.179 example.org ++192.0.1.180 example.org ++192.0.1.181 example.org ++192.0.1.182 example.org ++192.0.1.183 example.org ++192.0.1.184 example.org ++192.0.1.185 example.org ++192.0.1.186 example.org ++192.0.1.187 example.org ++192.0.1.188 example.org ++192.0.1.189 example.org ++192.0.1.190 example.org ++192.0.1.191 example.org ++192.0.1.192 example.org ++192.0.1.193 example.org ++192.0.1.194 example.org ++192.0.1.195 example.org ++192.0.1.196 example.org ++192.0.1.197 example.org ++192.0.1.198 example.org ++192.0.1.199 example.org ++192.0.1.200 example.org ++192.0.1.201 example.org ++192.0.1.202 example.org ++192.0.1.203 example.org ++192.0.1.204 example.org ++192.0.1.205 example.org ++192.0.1.206 example.org ++192.0.1.207 example.org ++192.0.1.208 example.org ++192.0.1.209 example.org ++192.0.1.210 example.org ++192.0.1.211 example.org ++192.0.1.212 example.org ++192.0.1.213 example.org ++192.0.1.214 example.org ++192.0.1.215 example.org ++192.0.1.216 example.org ++192.0.1.217 example.org ++192.0.1.218 example.org ++192.0.1.219 example.org ++192.0.1.220 example.org ++192.0.1.221 example.org ++192.0.1.222 example.org ++192.0.1.223 example.org ++192.0.1.224 example.org ++192.0.1.225 example.org ++192.0.1.226 example.org ++192.0.1.227 example.org ++192.0.1.228 example.org ++192.0.1.229 example.org ++192.0.1.230 example.org ++192.0.1.231 example.org ++192.0.1.232 example.org ++192.0.1.233 example.org ++192.0.1.234 example.org ++192.0.1.235 example.org ++192.0.1.236 example.org ++192.0.1.237 example.org ++192.0.1.238 example.org ++192.0.1.239 example.org ++192.0.1.240 example.org ++192.0.1.241 example.org ++192.0.1.242 example.org ++192.0.1.243 example.org ++192.0.1.244 example.org ++192.0.1.245 example.org ++192.0.1.246 example.org ++192.0.1.247 example.org ++192.0.1.248 example.org ++192.0.1.249 example.org ++192.0.1.250 example.org ++192.0.1.251 example.org ++192.0.1.252 example.org ++192.0.1.253 example.org ++192.0.1.254 example.org +diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c +index 43dfc6739e350a58..f391dc0a59849aab 100644 +--- a/sysdeps/posix/getaddrinfo.c ++++ b/sysdeps/posix/getaddrinfo.c +@@ -458,11 +458,6 @@ gaih_inet (const char *name, const struct gaih_service *service, + + if (name != NULL) + { +- at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); +- at->family = AF_UNSPEC; +- at->scopeid = 0; +- at->next = NULL; +- + if (req->ai_flags & AI_IDN) + { + char *out; +@@ -473,13 +468,21 @@ gaih_inet (const char *name, const struct gaih_service *service, + malloc_name = true; + } + +- if (__inet_aton_exact (name, (struct in_addr *) at->addr) != 0) ++ uint32_t addr[4]; ++ if (__inet_aton_exact (name, (struct in_addr *) addr) != 0) + { ++ at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); ++ at->scopeid = 0; ++ at->next = NULL; ++ + if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) +- at->family = AF_INET; ++ { ++ memcpy (at->addr, addr, sizeof (at->addr)); ++ at->family = AF_INET; ++ } + else if (req->ai_family == AF_INET6 && (req->ai_flags & AI_V4MAPPED)) + { +- at->addr[3] = at->addr[0]; ++ at->addr[3] = addr[0]; + at->addr[2] = htonl (0xffff); + at->addr[1] = 0; + at->addr[0] = 0; +@@ -493,49 +496,62 @@ gaih_inet (const char *name, const struct gaih_service *service, + + if (req->ai_flags & AI_CANONNAME) + canon = name; ++ ++ goto process_list; + } +- else if (at->family == AF_UNSPEC) ++ ++ char *scope_delim = strchr (name, SCOPE_DELIMITER); ++ int e; ++ ++ if (scope_delim == NULL) ++ e = inet_pton (AF_INET6, name, addr); ++ else ++ e = __inet_pton_length (AF_INET6, name, scope_delim - name, addr); ++ ++ if (e > 0) + { +- char *scope_delim = strchr (name, SCOPE_DELIMITER); +- int e; +- if (scope_delim == NULL) +- e = inet_pton (AF_INET6, name, at->addr); ++ at = alloca_account (sizeof (struct gaih_addrtuple), ++ alloca_used); ++ at->scopeid = 0; ++ at->next = NULL; ++ ++ if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) ++ { ++ memcpy (at->addr, addr, sizeof (at->addr)); ++ at->family = AF_INET6; ++ } ++ else if (req->ai_family == AF_INET ++ && IN6_IS_ADDR_V4MAPPED (addr)) ++ { ++ at->addr[0] = addr[3]; ++ at->addr[1] = addr[1]; ++ at->addr[2] = addr[2]; ++ at->addr[3] = addr[3]; ++ at->family = AF_INET; ++ } + else +- e = __inet_pton_length (AF_INET6, name, scope_delim - name, +- at->addr); +- if (e > 0) + { +- if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) +- at->family = AF_INET6; +- else if (req->ai_family == AF_INET +- && IN6_IS_ADDR_V4MAPPED (at->addr)) +- { +- at->addr[0] = at->addr[3]; +- at->family = AF_INET; +- } +- else +- { +- result = -EAI_ADDRFAMILY; +- goto free_and_return; +- } +- +- if (scope_delim != NULL +- && __inet6_scopeid_pton ((struct in6_addr *) at->addr, +- scope_delim + 1, +- &at->scopeid) != 0) +- { +- result = -EAI_NONAME; +- goto free_and_return; +- } ++ result = -EAI_ADDRFAMILY; ++ goto free_and_return; ++ } + +- if (req->ai_flags & AI_CANONNAME) +- canon = name; ++ if (scope_delim != NULL ++ && __inet6_scopeid_pton ((struct in6_addr *) at->addr, ++ scope_delim + 1, ++ &at->scopeid) != 0) ++ { ++ result = -EAI_NONAME; ++ goto free_and_return; + } ++ ++ if (req->ai_flags & AI_CANONNAME) ++ canon = name; ++ ++ goto process_list; + } + +- if (at->family == AF_UNSPEC && (req->ai_flags & AI_NUMERICHOST) == 0) ++ if ((req->ai_flags & AI_NUMERICHOST) == 0) + { +- struct gaih_addrtuple **pat = &at; + int no_data = 0; + int no_inet6_data = 0; + nss_action_list nip; +@@ -543,6 +559,7 @@ gaih_inet (const char *name, const struct gaih_service *service, + enum nss_status status = NSS_STATUS_UNAVAIL; + int no_more; + struct resolv_context *res_ctx = NULL; ++ bool do_merge = false; + + /* If we do not have to look for IPv6 addresses or the canonical + name, use the simple, old functions, which do not support +@@ -579,7 +596,7 @@ gaih_inet (const char *name, const struct gaih_service *service, + result = -EAI_MEMORY; + goto free_and_return; + } +- *pat = addrmem; ++ at = addrmem; + } + else + { +@@ -632,6 +649,8 @@ gaih_inet (const char *name, const struct gaih_service *service, + } + + struct gaih_addrtuple *addrfree = addrmem; ++ struct gaih_addrtuple **pat = &at; ++ + for (int i = 0; i < air->naddrs; ++i) + { + socklen_t size = (air->family[i] == AF_INET +@@ -695,12 +714,6 @@ gaih_inet (const char *name, const struct gaih_service *service, + + free (air); + +- if (at->family == AF_UNSPEC) +- { +- result = -EAI_NONAME; +- goto free_and_return; +- } +- + goto process_list; + } + else if (err == 0) +@@ -732,6 +745,22 @@ gaih_inet (const char *name, const struct gaih_service *service, + + while (!no_more) + { ++ /* Always start afresh; continue should discard previous results ++ and the hosts database does not support merge. */ ++ at = NULL; ++ free (canonbuf); ++ free (addrmem); ++ canon = canonbuf = NULL; ++ addrmem = NULL; ++ got_ipv6 = false; ++ ++ if (do_merge) ++ { ++ __set_h_errno (NETDB_INTERNAL); ++ __set_errno (EBUSY); ++ break; ++ } ++ + no_data = 0; + nss_gethostbyname4_r *fct4 = NULL; + +@@ -744,12 +773,14 @@ gaih_inet (const char *name, const struct gaih_service *service, + { + while (1) + { +- status = DL_CALL_FCT (fct4, (name, pat, ++ status = DL_CALL_FCT (fct4, (name, &at, + tmpbuf->data, tmpbuf->length, + &errno, &h_errno, + NULL)); + if (status == NSS_STATUS_SUCCESS) + break; ++ /* gethostbyname4_r may write into AT, so reset it. */ ++ at = NULL; + if (status != NSS_STATUS_TRYAGAIN + || errno != ERANGE || h_errno != NETDB_INTERNAL) + { +@@ -774,7 +805,9 @@ gaih_inet (const char *name, const struct gaih_service *service, + no_data = 1; + + if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL) +- canon = (*pat)->name; ++ canon = at->name; ++ ++ struct gaih_addrtuple **pat = &at; + + while (*pat != NULL) + { +@@ -826,6 +859,8 @@ gaih_inet (const char *name, const struct gaih_service *service, + + if (fct != NULL) + { ++ struct gaih_addrtuple **pat = &at; ++ + if (req->ai_family == AF_INET6 + || req->ai_family == AF_UNSPEC) + { +@@ -899,6 +934,10 @@ gaih_inet (const char *name, const struct gaih_service *service, + if (nss_next_action (nip, status) == NSS_ACTION_RETURN) + break; + ++ /* The hosts database does not support MERGE. */ ++ if (nss_next_action (nip, status) == NSS_ACTION_MERGE) ++ do_merge = true; ++ + nip++; + if (nip->module == NULL) + no_more = -1; +@@ -930,7 +969,7 @@ gaih_inet (const char *name, const struct gaih_service *service, + } + + process_list: +- if (at->family == AF_UNSPEC) ++ if (at == NULL) + { + result = -EAI_NONAME; + goto free_and_return; diff --git a/glibc.spec b/glibc.spec index 4b6b6b8..d28f242 100644 --- a/glibc.spec +++ b/glibc.spec @@ -155,7 +155,7 @@ end \ Summary: The GNU libc libraries Name: glibc Version: %{glibcversion} -Release: 83%{?dist}.2 +Release: 83%{?dist}.3 # In general, GPLv2+ is used by programs, LGPLv2+ is used for # libraries. @@ -757,6 +757,7 @@ Patch516: glibc-RHEL-2491-3.patch Patch517: glibc-RHEL-2491-4.patch Patch518: glibc-RHEL-2491-5.patch Patch519: glibc-rh2234716.patch +Patch520: glibc-RHEL-2438.patch ############################################################################## # Continued list of core "glibc" package information: @@ -2914,6 +2915,9 @@ update_gconv_modules_cache () %endif %changelog +* Fri Sep 15 2023 Siddhesh Poyarekar - 2.34-83.3 +- CVE-2023-4813: potential use-after-free in gaih_inet (RHEL-2438) + * Fri Sep 15 2023 Carlos O'Donell - 2.34-83.2 - CVE-2023-4527: Stack read overflow in getaddrinfo in no-aaaa mode (#2234716)