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From b71d112385937fdffac8bb78df279b23bc9441c4 Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Tue, 4 Dec 2018 10:01:35 +0100
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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 4d542ad947..fe6e2ff17c 100644
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--- a/src/core/service.c
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+++ b/src/core/service.c
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@@ -3045,8 +3045,12 @@ static void service_notify_message(Unit *u, pid_t pid, char **tags, FDSet *fds)
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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->id, "Status message in notification 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->id, "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->id, "Status message in notification message is not UTF-8 clean, ignoring.");
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else {
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log_unit_debug(u->id, "%s: got STATUS=%s", u->id, e);
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diff --git a/src/core/service.h b/src/core/service.h
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index 1f937dfe57..e0547a464e 100644
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--- a/src/core/service.h
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+++ b/src/core/service.h
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@@ -31,6 +31,8 @@ typedef struct ServiceFDStore ServiceFDStore;
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#include "exit-status.h"
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#include "emergency-action.h"
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+#define STATUS_TEXT_MAX (16U*1024U)
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+
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typedef enum ServiceState {
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SERVICE_DEAD,
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SERVICE_START_PRE,
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