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From 95ec0c76b4ee758012bc6c282c5299baee5ae451 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Thu, 3 Jan 2019 16:28:30 +0100
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Subject: [PATCH] journal-remote: set a limit on the number of fields in a
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message
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Existing use of E2BIG is replaced with ENOBUFS (entry too long), and E2BIG is
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reused for the new error condition (too many fields).
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This matches the change done for systemd-journald, hence forming the second
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part of the fix for CVE-2018-16865
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(https://bugzilla.redhat.com/show_bug.cgi?id=1653861).
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Resolves: #1657792
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---
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src/journal-remote/journal-remote-parse.c | 2 +-
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src/journal-remote/journal-remote-write.c | 3 +++
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src/journal-remote/journal-remote.c | 14 ++++++++++++--
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3 files changed, 16 insertions(+), 3 deletions(-)
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diff --git a/src/journal-remote/journal-remote-parse.c b/src/journal-remote/journal-remote-parse.c
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index 64089da19..53f4e3612 100644
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--- a/src/journal-remote/journal-remote-parse.c
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+++ b/src/journal-remote/journal-remote-parse.c
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@@ -107,7 +107,7 @@ static int get_line(RemoteSource *source, char **line, size_t *size) {
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source->scanned = source->filled;
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if (source->scanned >= DATA_SIZE_MAX) {
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log_error("Entry is bigger than %u bytes.", DATA_SIZE_MAX);
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- return -E2BIG;
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+ return -ENOBUFS;
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}
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if (source->passive_fd)
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diff --git a/src/journal-remote/journal-remote-write.c b/src/journal-remote/journal-remote-write.c
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index 99820fa7b..99920e62c 100644
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--- a/src/journal-remote/journal-remote-write.c
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+++ b/src/journal-remote/journal-remote-write.c
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@@ -22,6 +22,9 @@
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#include "journal-remote.h"
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int iovw_put(struct iovec_wrapper *iovw, void* data, size_t len) {
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+ if (iovw->count >= ENTRY_FIELD_COUNT_MAX)
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+ return -E2BIG;
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+
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if (!GREEDY_REALLOC(iovw->iovec, iovw->size_bytes, iovw->count + 1))
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return log_oom();
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diff --git a/src/journal-remote/journal-remote.c b/src/journal-remote/journal-remote.c
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index a455fb6bd..e65daf6a0 100644
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--- a/src/journal-remote/journal-remote.c
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+++ b/src/journal-remote/journal-remote.c
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@@ -524,11 +524,18 @@ static int process_http_upload(
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break;
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else if (r < 0) {
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log_warning("Failed to process data for connection %p", connection);
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- if (r == -E2BIG)
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+ if (r == -ENOBUFS)
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return mhd_respondf(connection,
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MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
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"Entry is too large, maximum is %u bytes.\n",
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DATA_SIZE_MAX);
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+
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+ else if (r == -E2BIG)
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+ return mhd_respondf(connection,
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+ MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
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+ "Entry with more fields than the maximum of %u\n",
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+ ENTRY_FIELD_COUNT_MAX);
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+
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else
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return mhd_respondf(connection,
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MHD_HTTP_UNPROCESSABLE_ENTITY,
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@@ -1043,7 +1050,10 @@ static int handle_raw_source(sd_event_source *event,
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log_debug("%zu active sources remaining", s->active);
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return 0;
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} else if (r == -E2BIG) {
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- log_notice_errno(E2BIG, "Entry too big, skipped");
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+ log_notice_errno(E2BIG, "Entry with too many fields, skipped");
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+ return 1;
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+ } else if (r == -ENOBUFS) {
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+ log_notice_errno(ENOBUFS, "Entry too big, skipped");
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return 1;
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} else if (r == -EAGAIN) {
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return 0;
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