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Blame SOURCES/0693-core-when-deserializing-state-always-use-read_line-L.patch

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From 650d5c39753d095f8ae6cff418306cf1a6b8fd25 Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Fri, 2 Nov 2018 08:40:40 +0100
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Subject: [PATCH] =?UTF-8?q?core:=20when=20deserializing=20state=20always?=
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 =?UTF-8?q?=20use=20read=5Fline(=E2=80=A6,=20LONG=5FLINE=5FMAX,=20?=
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 =?UTF-8?q?=E2=80=A6)?=
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This should be much better than fgets(), as we can read substantially
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longer lines and overly long lines result in proper errors.
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Fixes a vulnerability discovered by Jann Horn at Google.
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(cherry picked from commit 8948b3415d762245ebf5e19d80b97d4d8cc208c1)
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Resolves: CVE-2018-15686
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[jsynacek] There were more commits in the pull request of which the cherry
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picked commit was a part of, see
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https://github.com/systemd/systemd/pull/10519/commits.
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I decided not to backport any of the remaining ones, because they were
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mostly irrelevant to the actual fix.
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---
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 src/core/job.c     | 19 +++++++++++--------
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 src/core/manager.c | 38 ++++++++++++++++----------------------
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 src/core/unit.c    | 17 ++++++++---------
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 3 files changed, 35 insertions(+), 39 deletions(-)
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diff --git a/src/core/job.c b/src/core/job.c
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index 275503169b..998b231ed9 100644
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--- a/src/core/job.c
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+++ b/src/core/job.c
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@@ -38,6 +38,7 @@
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 #include "async.h"
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 #include "virt.h"
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 #include "dbus.h"
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+#include "fileio.h"
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 Job* job_new_raw(Unit *unit) {
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         Job *j;
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@@ -1035,23 +1036,25 @@ int job_serialize(Job *j, FILE *f, FDSet *fds) {
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 }
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 int job_deserialize(Job *j, FILE *f, FDSet *fds) {
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+        int r = 0;
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+
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         assert(j);
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         for (;;) {
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-                char line[LINE_MAX], *l, *v;
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+                _cleanup_free_ char *line = NULL;
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+                char *l, *v;
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                 size_t k;
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-                if (!fgets(line, sizeof(line), f)) {
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-                        if (feof(f))
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-                                return 0;
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-                        return -errno;
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-                }
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+                r = read_line(f, LONG_LINE_MAX, &line);
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+                if (r < 0)
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+                        return log_error_errno(r, "Failed to read serialization line: %m");
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+                if (r == 0)
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+                        return 0;
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-                char_array_0(line);
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                 l = strstrip(line);
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                 /* End marker */
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-                if (l[0] == 0)
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+                if (isempty(l))
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                         return 0;
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                 k = strcspn(l, "=");
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diff --git a/src/core/manager.c b/src/core/manager.c
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index 0466e4bb8a..73d6c81fdb 100644
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--- a/src/core/manager.c
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+++ b/src/core/manager.c
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@@ -37,6 +37,7 @@
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 #include <sys/stat.h>
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 #include <dirent.h>
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 #include <sys/timerfd.h>
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+#include <fileio.h>
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 #ifdef HAVE_AUDIT
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 #include <libaudit.h>
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@@ -2559,21 +2560,19 @@ int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
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         m->n_reloading ++;
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         for (;;) {
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-                char line[LINE_MAX], *l;
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+                _cleanup_free_ char *line = NULL;
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+                char *l;
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-                if (!fgets(line, sizeof(line), f)) {
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-                        if (feof(f))
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-                                r = 0;
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-                        else
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-                                r = -errno;
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-                        goto finish;
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-                }
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+                r = read_line(f, LONG_LINE_MAX, &line);
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+                if (r < 0)
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+                        return log_error_errno(r, "Failed to read serialization line: %m");
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+                if (r == 0)
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+                        break;
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-                char_array_0(line);
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                 l = strstrip(line);
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-                if (l[0] == 0)
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+                 if (isempty(l)) /* end marker */
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                         break;
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                 if (startswith(l, "current-job-id=")) {
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@@ -2708,22 +2707,17 @@ int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
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         }
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         for (;;) {
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+                _cleanup_free_ char *line = NULL;
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                 Unit *u;
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-                char name[UNIT_NAME_MAX+2];
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                 /* Start marker */
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-                if (!fgets(name, sizeof(name), f)) {
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-                        if (feof(f))
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-                                r = 0;
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-                        else
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-                                r = -errno;
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-
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-                        goto finish;
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-                }
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-
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-                char_array_0(name);
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+                r = read_line(f, LONG_LINE_MAX, &line);
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+                if (r < 0)
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+                        return log_error_errno(r, "Failed to read serialization line: %m");
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+                if (r == 0)
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+                        break;
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-                r = manager_load_unit(m, strstrip(name), NULL, NULL, &u);
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+                r = manager_load_unit(m, strstrip(line), NULL, NULL, &u);
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                 if (r < 0)
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                         goto finish;
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diff --git a/src/core/unit.c b/src/core/unit.c
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index e8532a057d..37fac8db3a 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -2644,20 +2644,19 @@ int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
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                 rt = (ExecRuntime**) ((uint8_t*) u + offset);
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         for (;;) {
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-                char line[LINE_MAX], *l, *v;
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+                 _cleanup_free_ char *line = NULL;
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+                char *l, *v;
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                 size_t k;
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-                if (!fgets(line, sizeof(line), f)) {
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-                        if (feof(f))
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-                                return 0;
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-                        return -errno;
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-                }
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+                r = read_line(f, LONG_LINE_MAX, &line);
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+                if (r < 0)
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+                        return log_error_errno(r, "Failed to read serialization line: %m");
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+                if (r == 0) /* eof */
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+                        return 0;
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-                char_array_0(line);
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                 l = strstrip(line);
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-
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                 /* End marker */
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-                if (l[0] == 0)
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+                if (isempty(l))
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                         return 0;
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                 k = strcspn(l, "=");