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GET /api/patches/2216445/?format=api
{ "id": 2216445, "url": "http://patchwork.ozlabs.org/api/patches/2216445/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/patch/20260326125907.3645168-1-carlos@redhat.com/", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/projects/41/?format=api", "name": "GNU C Library", "link_name": "glibc", "list_id": "libc-alpha.sourceware.org", "list_email": "libc-alpha@sourceware.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260326125907.3645168-1-carlos@redhat.com>", "list_archive_url": null, "date": "2026-03-26T12:58:37", "name": "[v2] resolv: Check hostname for validity (CVE-2026-4438)", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7631d333c1d47dd8dcb103f9095c5da9687459b8", "submitter": { "id": 22438, "url": "http://patchwork.ozlabs.org/api/people/22438/?format=api", "name": "Carlos O'Donell", "email": "carlos@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/glibc/patch/20260326125907.3645168-1-carlos@redhat.com/mbox/", "series": [ { "id": 497586, "url": "http://patchwork.ozlabs.org/api/series/497586/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/list/?series=497586", "date": "2026-03-26T12:58:37", "name": "[v2] resolv: Check hostname for validity (CVE-2026-4438)", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/497586/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216445/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216445/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "libc-alpha@sourceware.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "libc-alpha@sourceware.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=KhaSWVYp;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; 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charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-BeenThere": "libc-alpha@sourceware.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Libc-alpha mailing list <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "The processed hostname in getanswer_ptr should be correctly checked to\navoid invalid characters from being allowed, including shell\nmetacharacters. It is a security issue to fail to check the returned\nhostname for validity.\n\nA regression test is added for invalid metacharacters and other cases\nof invalid or valid characters.\n\nNo regressions on x86_64-linux-gnu.\n---\nv1 -> v2\n- Use array_length for test iteration.\n- Sanity check count and enforce limit with array_length.\n\n resolv/Makefile | 3 +\n resolv/nss_dns/dns-host.c | 2 +-\n resolv/tst-resolv-invalid-ptr.c | 255 ++++++++++++++++++++++++++++++++\n 3 files changed, 259 insertions(+), 1 deletion(-)\n create mode 100644 resolv/tst-resolv-invalid-ptr.c", "diff": "diff --git a/resolv/Makefile b/resolv/Makefile\nindex 95bad5df27..971608eff5 100644\n--- a/resolv/Makefile\n+++ b/resolv/Makefile\n@@ -117,6 +117,7 @@ tests += \\\n tst-resolv-dns-section \\\n tst-resolv-edns \\\n tst-resolv-invalid-cname \\\n+ tst-resolv-invalid-ptr \\\n tst-resolv-network \\\n tst-resolv-noaaaa \\\n tst-resolv-noaaaa-vc \\\n@@ -312,6 +313,8 @@ $(objpfx)tst-resolv-res_init-thread: $(objpfx)libresolv.so \\\n $(shared-thread-library)\n $(objpfx)tst-resolv-invalid-cname: $(objpfx)libresolv.so \\\n $(shared-thread-library)\n+$(objpfx)tst-resolv-invalid-ptr: $(objpfx)libresolv.so \\\n+ $(shared-thread-library)\n $(objpfx)tst-resolv-no-search: $(objpfx)libresolv.so $(shared-thread-library)\n $(objpfx)tst-resolv-noaaaa: $(objpfx)libresolv.so $(shared-thread-library)\n $(objpfx)tst-resolv-noaaaa-vc: $(objpfx)libresolv.so $(shared-thread-library)\ndiff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c\nindex 893137027e..728dae615d 100644\n--- a/resolv/nss_dns/dns-host.c\n+++ b/resolv/nss_dns/dns-host.c\n@@ -866,7 +866,7 @@ getanswer_ptr (unsigned char *packet, size_t packetlen,\n \t char hname[MAXHOSTNAMELEN + 1];\n \t if (__ns_name_unpack (c.begin, c.end, rr.rdata,\n \t\t\t\tname_buffer, sizeof (name_buffer)) < 0\n-\t || !__res_binary_hnok (expected_name)\n+\t || !__res_binary_hnok (name_buffer)\n \t || __ns_name_ntop (name_buffer, hname, sizeof (hname)) < 0)\n \t {\n \t *h_errnop = NO_RECOVERY;\ndiff --git a/resolv/tst-resolv-invalid-ptr.c b/resolv/tst-resolv-invalid-ptr.c\nnew file mode 100644\nindex 0000000000..0c802ab967\n--- /dev/null\n+++ b/resolv/tst-resolv-invalid-ptr.c\n@@ -0,0 +1,255 @@\n+/* Test handling of invalid T_PTR results (bug 34015).\n+ Copyright (C) 2022-2026 Free Software Foundation, Inc.\n+ This file is part of the GNU C Library.\n+\n+ The GNU C Library is free software; you can redistribute it and/or\n+ modify it under the terms of the GNU Lesser General Public\n+ License as published by the Free Software Foundation; either\n+ version 2.1 of the License, or (at your option) any later version.\n+\n+ The GNU C Library is distributed in the hope that it will be useful,\n+ but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n+ Lesser General Public License for more details.\n+\n+ You should have received a copy of the GNU Lesser General Public\n+ License along with the GNU C Library; if not, see\n+ <https://www.gnu.org/licenses/>. */\n+\n+#include <array_length.h>\n+#include <errno.h>\n+#include <netdb.h>\n+#include <resolv.h>\n+#include <stdlib.h>\n+#include <string.h>\n+#include <support/check.h>\n+#include <support/format_nss.h>\n+#include <support/resolv_test.h>\n+#include <support/support.h>\n+\n+/* Name of test, the answer, the expected error return, and if we\n+ expect the call to fail. */\n+struct item {\n+ const char *test;\n+ const char *answer;\n+ int expected;\n+ bool fail;\n+};\n+\n+static const struct item test_items[] =\n+ {\n+ /* Test for invalid characters. */\n+ { \"Invalid use of \\\"|\\\"\",\n+ \"test.|.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"&\\\"\",\n+ \"test.&.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\";\\\"\",\n+ \"test.;.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"<\\\"\",\n+ \"test.<.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\">\\\"\",\n+ \"test.>.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"(\\\"\",\n+ \"test.(.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\")\\\"\",\n+ \"test.).ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"$\\\"\",\n+ \"test.$.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"`\\\"\",\n+ \"test.`.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"\\\\\\\"\",\n+ \"test.\\\\.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"\\'\\\"\",\n+ \"test.'.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"\\\"\\\"\",\n+ \"test.\\\".ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\" \\\"\",\n+ \"test. .ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"\\\\t\\\"\",\n+ \"test.\\t.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"\\\\n\\\"\",\n+ \"test.\\n.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"\\\\r\\\"\",\n+ \"test.\\r.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"*\\\"\",\n+ \"test.*.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"?\\\"\",\n+ \"test.?.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"[\\\"\",\n+ \"test.[.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"]\\\"\",\n+ \"test.].ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\",\\\"\",\n+ \"test.,.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"~\\\"\",\n+ \"test.~.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\":\\\"\",\n+ \"test.:.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"!\\\"\",\n+ \"test.!.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"@\\\"\",\n+ \"test.@.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"#\\\"\",\n+ \"test.#.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"%\\\"\",\n+ \"test.%%.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of \\\"^\\\"\",\n+ \"test.^.ptr.example\", NO_RECOVERY, true },\n+\n+ /* Test for invalid UTF-8 characters (2-byte, 4-byte, 6-byte). */\n+ { \"Invalid use of UTF-8 (2-byte, U+00C0-U+00C2)\",\n+ \"ÁÂÃ.test.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of UTF-8 (4-byte, U+0750-U+0752)\",\n+ \"ݐݑݒ.test.ptr.example\", NO_RECOVERY, true },\n+ { \"Invalid use of UTF-8 (6-byte, U+0904-U+0906)\",\n+ \"ऄअआ.test.ptr.example\", NO_RECOVERY, true },\n+\n+ /* Test for \"-\" which may be valid depending on position. */\n+ { \"Invalid leading \\\"-\\\"\",\n+ \"-test.ptr.example\", NO_RECOVERY, true },\n+ { \"Valid trailing \\\"-\\\"\",\n+ \"test-.ptr.example\", 0, false },\n+ { \"Valid mid-label use of \\\"-\\\"\",\n+ \"te-st.ptr.example\", 0, false },\n+\n+ /* Test for \"_\" which is always valid in any position. */\n+ { \"Valid leading use of \\\"_\\\"\",\n+ \"_test.ptr.example\", 0, false },\n+ { \"Valid mid-label use of \\\"_\\\"\",\n+ \"te_st.ptr.example\", 0, false },\n+ { \"Valid trailing use of \\\"_\\\"\",\n+ \"test_.ptr.example\", 0, false },\n+\n+ /* Sanity test the broader set [A-Za-z0-9_-] of valid characters. */\n+ { \"Valid \\\"[A-Z]\\\"\",\n+ \"test.ABCDEFGHIJKLMNOPQRSTUVWXYZ.ptr.example\", 0, false },\n+ { \"Valid \\\"[a-z]\\\"\",\n+ \"test.abcdefghijklmnopqrstuvwxyz.ptr.example\", 0, false },\n+ { \"Valid \\\"[0-9]\\\"\",\n+ \"test.0123456789.ptr.example\", 0, false },\n+ { \"Valid mixed use of \\\"[A-Za-z0-9_-]\\\"\",\n+ \"test.012abcABZ_-.ptr.example\", 0, false },\n+ };\n+\n+static void\n+response (const struct resolv_response_context *ctx,\n+ struct resolv_response_builder *b,\n+ const char *qname, uint16_t qclass, uint16_t qtype)\n+{\n+ TEST_COMPARE (qclass, C_IN);\n+\n+ /* We only test PTR. */\n+ TEST_COMPARE (qtype, T_PTR);\n+\n+ unsigned int count, count1;\n+ char *tail = NULL;\n+\n+ /* The test implementation can handle up to 255 tests. */\n+ if (strstr (qname, \"in-addr.arpa\") != NULL\n+ && sscanf (qname, \"%u.%ms\", &count, &tail) == 2)\n+ TEST_COMPARE_STRING (tail, \"0.168.192.in-addr.arpa\");\n+ else if (sscanf (qname, \"%x.%x.%ms\", &count, &count1, &tail) == 3)\n+ {\n+ TEST_COMPARE_STRING (tail, \"\\\n+0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa\");\n+ count |= count1 << 4;\n+ }\n+ else\n+ FAIL_EXIT1 (\"invalid QNAME: %s\\n\", qname);\n+ free (tail);\n+\n+ /* Cross check. Count has a fixed bound (soft limit). */\n+ TEST_VERIFY (count >= 0 && count <= 255);\n+\n+ /* We have a fixed number of tests (hard limit). */\n+ TEST_VERIFY_EXIT (count < array_length (test_items));\n+\n+ struct resolv_response_flags flags = {};\n+ resolv_response_init (b, flags);\n+ resolv_response_add_question (b, qname, qclass, qtype);\n+ resolv_response_section (b, ns_s_an);\n+\n+ /* Actual answer record. */\n+ resolv_response_open_record (b, qname, qclass, qtype, 60);\n+\n+ /* Record the answer. */\n+ resolv_response_add_name (b, test_items[count].answer);\n+ resolv_response_close_record (b);\n+}\n+\n+/* Perform one check using a reverse lookup. */\n+static void\n+check_reverse (int af, int count)\n+{\n+ TEST_VERIFY (af == AF_INET || af == AF_INET6);\n+ TEST_VERIFY_EXIT (count < array_length (test_items));\n+\n+ /* Generate an address to query for each test. */\n+ char addr[sizeof (struct in6_addr)] = { 0 };\n+ socklen_t addrlen;\n+ if (af == AF_INET)\n+ {\n+ addr[0] = (char) 192;\n+ addr[1] = (char) 168;\n+ addr[2] = (char) 0;\n+ addr[3] = (char) count;\n+ addrlen = 4;\n+ }\n+ else\n+ {\n+ addr[0] = 0x20;\n+ addr[1] = 0x01;\n+ addr[2] = 0x0d;\n+ addr[3] = 0xb8;\n+ addr[4] = addr[5] = addr[6] = addr[7] = 0x0;\n+ addr[8] = addr[9] = addr[10] = addr[11] = 0x0;\n+ addr[12] = 0x0;\n+ addr[13] = 0x0;\n+ addr[14] = 0x0;\n+ addr[15] = (char) count;\n+ addrlen = 16;\n+ }\n+\n+ h_errno = 0;\n+ struct hostent *answer = gethostbyaddr (addr, addrlen, af);\n+\n+ /* Verify h_errno is as expected. */\n+ TEST_COMPARE (h_errno, test_items[count].expected);\n+ if (h_errno != test_items[count].expected)\n+ /* And print more information if it's not. */\n+ printf (\"INFO: %s\\n\", test_items[count].test);\n+\n+ if (test_items[count].fail)\n+ {\n+ /* We expected a failure so verify answer is NULL. */\n+ TEST_VERIFY (answer == NULL);\n+ /* If it's not NULL we should print out what we received. */\n+ if (answer != NULL)\n+ printf (\"error: unexpected success: %s\\n\",\n+\t\tsupport_format_hostent (answer));\n+ }\n+ else\n+ /* We don't expect a failure so answer must be valid. */\n+ TEST_COMPARE_STRING (answer->h_name, test_items[count].answer);\n+}\n+\n+static int\n+do_test (void)\n+{\n+ struct resolv_test *obj = resolv_test_start\n+ ((struct resolv_redirect_config)\n+ {\n+ .response_callback = response\n+ });\n+\n+ for (int i = 0; i < array_length (test_items); i++)\n+ {\n+ check_reverse (AF_INET, i);\n+ check_reverse (AF_INET6, i);\n+ }\n+ resolv_test_end (obj);\n+\n+ return 0;\n+}\n+\n+#include <support/test-driver.c>\n", "prefixes": [ "v2" ] }