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From 6abfec31acae53943896b309db4a09a1cecac9a3 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Wed, 17 Oct 2018 18:37:48 +0200
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Subject: [PATCH] core: enforce a limit on STATUS= texts recvd from services
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Let's better be safe than sorry, and put a limit on what we receive.
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(cherry picked from commit 3eac1bcae9284fb8b18f4b82156c0e85ddb004e5)
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Related: CVE-2018-15686
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---
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src/core/service.c | 8 ++++++--
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src/core/service.h | 2 ++
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2 files changed, 8 insertions(+), 2 deletions(-)
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diff --git a/src/core/service.c b/src/core/service.c
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index db1356c41..db1722188 100644
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--- a/src/core/service.c
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+++ b/src/core/service.c
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@@ -3549,8 +3549,12 @@ static void service_notify_message(
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_cleanup_free_ char *t = NULL;
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if (!isempty(e)) {
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- if (!utf8_is_valid(e))
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- log_unit_warning(u, "Status message in notification message is not UTF-8 clean.");
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+ /* Note that this size limit check is mostly paranoia: since the datagram size we are willing
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+ * to process is already limited to NOTIFY_BUFFER_MAX, this limit here should never be hit. */
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+ if (strlen(e) > STATUS_TEXT_MAX)
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+ log_unit_warning(u, "Status message overly long (%zu > %u), ignoring.", strlen(e), STATUS_TEXT_MAX);
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+ else if (!utf8_is_valid(e))
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+ log_unit_warning(u, "Status message in notification message is not UTF-8 clean, ignoring.");
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else {
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t = strdup(e);
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if (!t)
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diff --git a/src/core/service.h b/src/core/service.h
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index 9c06e9188..a142b09f0 100644
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--- a/src/core/service.h
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+++ b/src/core/service.h
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@@ -202,3 +202,5 @@ const char* service_result_to_string(ServiceResult i) _const_;
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ServiceResult service_result_from_string(const char *s) _pure_;
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DEFINE_CAST(SERVICE, Service);
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+
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+#define STATUS_TEXT_MAX (16U*1024U)
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