From 7738a74e6878536e155d9d589e7ec727c135f5a0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pavel=20B=C5=99ezina?= Date: Thu, 19 Oct 2017 10:39:21 +0200 Subject: [PATCH 12/21] sudo: always use srv_opts from id context Prior this patch, we remember id_ctx->srv_opts in sudo request to switch the latest usn values. This works fine most of the time but it may cause a crash. If we have two concurrent sudo refresh and one of these fails, it causes failover to try the next server and possibly replacing the old srv_opts with new one and it causes an access after free in the other refresh. Resolves: https://pagure.io/SSSD/sssd/issue/3562 Reviewed-by: Jakub Hrozek (cherry picked from commit 2ee201dcf6bbe52abbbed3c2fc4c35ca2e0c8a43) --- src/providers/ldap/sdap_async_sudo.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/src/providers/ldap/sdap_async_sudo.c b/src/providers/ldap/sdap_async_sudo.c index 3c69837fda313b2645c3a8497252670312f600ea..88a387422d5c9ae86cea583bb38dadf90cba37f3 100644 --- a/src/providers/ldap/sdap_async_sudo.c +++ b/src/providers/ldap/sdap_async_sudo.c @@ -279,7 +279,6 @@ done: struct sdap_sudo_refresh_state { struct sdap_sudo_ctx *sudo_ctx; struct tevent_context *ev; - struct sdap_server_opts *srv_opts; struct sdap_options *opts; struct sdap_id_op *sdap_op; struct sysdb_ctx *sysdb; @@ -405,9 +404,6 @@ static void sdap_sudo_refresh_connect_done(struct tevent_req *subreq) DEBUG(SSSDBG_TRACE_FUNC, "SUDO LDAP connection successful\n"); - /* Obtain srv_opts here in case of first connection. */ - state->srv_opts = state->sudo_ctx->id_ctx->srv_opts; - /* Renew host information if needed. */ if (state->sudo_ctx->run_hostinfo) { subreq = sdap_sudo_get_hostinfo_send(state, state->opts, @@ -586,7 +582,6 @@ static void sdap_sudo_refresh_done(struct tevent_req *subreq) goto done; } - /* start transaction */ ret = sysdb_transaction_start(state->sysdb); if (ret != EOK) { @@ -621,7 +616,7 @@ static void sdap_sudo_refresh_done(struct tevent_req *subreq) /* remember new usn */ ret = sysdb_get_highest_usn(state, rules, rules_count, &usn); if (ret == EOK) { - sdap_sudo_set_usn(state->srv_opts, usn); + sdap_sudo_set_usn(state->sudo_ctx->id_ctx->srv_opts, usn); } else { DEBUG(SSSDBG_MINOR_FAILURE, "Unable to get highest USN [%d]: %s\n", ret, sss_strerror(ret)); -- 2.13.5