108 lines
4.1 KiB
Diff
108 lines
4.1 KiB
Diff
From 7d9f3cfb10b0fe70df7358d26d7b1f374ea1a0cb Mon Sep 17 00:00:00 2001
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From: Eric Covener <covener@apache.org>
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Date: Fri, 5 Jun 2026 10:26:23 +0000
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Subject: [PATCH] Merge r1935014 from trunk:
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ap_regname: restrict to reasonable captures
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Reviewed By: covener, gbechis, jfclere
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1935015 13f79535-47bb-0310-9956-ffa450edef68
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---
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include/ap_regex.h | 2 ++
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modules/proxy/mod_proxy.c | 4 +++-
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server/core.c | 12 +++++++++---
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server/util_pcre.c | 11 ++++++++++-
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4 files changed, 24 insertions(+), 5 deletions(-)
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diff --git a/include/ap_regex.h b/include/ap_regex.h
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index 50d5abaa0fd..d6afbb17d76 100644
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--- a/include/ap_regex.h
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+++ b/include/ap_regex.h
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@@ -204,6 +204,8 @@ AP_DECLARE(apr_size_t) ap_regerror(int errcode, const ap_regex_t *preg,
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* @param prefix An optional prefix to add to the returned names. AP_REG_MATCH
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* is the recommended prefix.
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* @param upper If non zero, uppercase the names
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+ * @return number of regex backrefernces returned, -1 for error
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+ * for successful match, AP_REG_NOMATCH otherwise
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*/
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AP_DECLARE(int) ap_regname(const ap_regex_t *preg,
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apr_array_header_t *names, const char *prefix,
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diff --git a/modules/proxy/mod_proxy.c b/modules/proxy/mod_proxy.c
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index 4047d58f2aa..521e8f21837 100644
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--- a/modules/proxy/mod_proxy.c
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+++ b/modules/proxy/mod_proxy.c
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@@ -2886,7 +2886,9 @@ static const char *proxysection(cmd_parms *cmd, void *mconfig, const char *arg)
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if (r) {
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conf->refs = apr_array_make(cmd->pool, 8, sizeof(char *));
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- ap_regname(r, conf->refs, AP_REG_MATCH, 1);
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+ if (ap_regname(r, conf->refs, AP_REG_MATCH, 1) < 0) {
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+ return "Error processing regex captures";
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+ }
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}
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ap_add_per_proxy_conf(cmd->server, new_dir_conf);
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diff --git a/server/core.c b/server/core.c
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index 925bb23018d..df270b019e4 100644
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--- a/server/core.c
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+++ b/server/core.c
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@@ -2526,7 +2526,9 @@ static const char *dirsection(cmd_parms *cmd, void *mconfig, const char *arg)
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if (r) {
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conf->refs = apr_array_make(cmd->pool, 8, sizeof(char *));
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- ap_regname(r, conf->refs, AP_REG_MATCH, 1);
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+ if (ap_regname(r, conf->refs, AP_REG_MATCH, 1) < 0) {
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+ return "Error processing regex captures";
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+ }
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}
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/* Make this explicit - the "/" root has 0 elements, that is, we
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@@ -2607,7 +2609,9 @@ static const char *urlsection(cmd_parms *cmd, void *mconfig, const char *arg)
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if (r) {
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conf->refs = apr_array_make(cmd->pool, 8, sizeof(char *));
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- ap_regname(r, conf->refs, AP_REG_MATCH, 1);
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+ if (ap_regname(r, conf->refs, AP_REG_MATCH, 1) < 0) {
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+ return "Error processing regex captures";
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+ }
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}
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ap_add_per_url_conf(cmd->server, new_url_conf);
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@@ -2694,7 +2698,9 @@ static const char *filesection(cmd_parms *cmd, void *mconfig, const char *arg)
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if (r) {
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conf->refs = apr_array_make(cmd->pool, 8, sizeof(char *));
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- ap_regname(r, conf->refs, AP_REG_MATCH, 1);
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+ if (ap_regname(r, conf->refs, AP_REG_MATCH, 1) < 0) {
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+ return "Error processing regex captures";
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+ }
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}
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ap_add_file_conf(cmd->pool, (core_dir_config *)mconfig, new_file_conf);
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diff --git a/server/util_pcre.c b/server/util_pcre.c
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index 0a9dc50112d..46e82112a58 100644
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--- a/server/util_pcre.c
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+++ b/server/util_pcre.c
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@@ -521,7 +521,16 @@ AP_DECLARE(int) ap_regname(const ap_regex_t *preg,
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for (i = 0; i < namecount; i++) {
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const char *offset = nametable + i * nameentrysize;
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- int capture = ((offset[0] << 8) + offset[1]);
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+ int capture = (((unsigned char)offset[0] << 8) + (unsigned char)offset[1]);
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+
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+ /* Sanity check: reject unreasonably large capture group numbers.
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+ * PCRE allows up to 65535 groups, but such large numbers would
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+ * cause excessive memory allocation. Limit to a reasonable maximum.
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+ */
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+ if (capture > 1024) {
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+ return -1;
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+ }
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+
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while (names->nelts <= capture) {
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apr_array_push(names);
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}
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