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systemd/SOURCES/0221-syslog-fix-segfault-in...

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From 8bd791fb3a8e85063e297204bdef8004aacd22b1 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 8 Aug 2018 18:27:15 +0900
Subject: [PATCH] syslog: fix segfault in syslog_parse_priority()
(cherry picked from commit a5ee33b951cfa22db53d0274c9c6c0d9d4dae39d)
Resolves: #1761519
---
src/basic/syslog-util.c | 20 +++++++++++---------
src/journal/test-journal-syslog.c | 20 ++++++++++++++++++++
2 files changed, 31 insertions(+), 9 deletions(-)
diff --git a/src/basic/syslog-util.c b/src/basic/syslog-util.c
index 21461fa581..fe129482f3 100644
--- a/src/basic/syslog-util.c
+++ b/src/basic/syslog-util.c
@@ -10,7 +10,8 @@
int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
int a = 0, b = 0, c = 0;
- int k;
+ const char *end;
+ size_t k;
assert(p);
assert(*p);
@@ -19,21 +20,22 @@ int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
if ((*p)[0] != '<')
return 0;
- if (!strchr(*p, '>'))
+ end = strchr(*p, '>');
+ if (!end)
return 0;
- if ((*p)[2] == '>') {
+ k = end - *p;
+ assert(k > 0);
+
+ if (k == 2)
c = undecchar((*p)[1]);
- k = 3;
- } else if ((*p)[3] == '>') {
+ else if (k == 3) {
b = undecchar((*p)[1]);
c = undecchar((*p)[2]);
- k = 4;
- } else if ((*p)[4] == '>') {
+ } else if (k == 4) {
a = undecchar((*p)[1]);
b = undecchar((*p)[2]);
c = undecchar((*p)[3]);
- k = 5;
} else
return 0;
@@ -46,7 +48,7 @@ int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
else
*priority = (*priority & LOG_FACMASK) | c;
- *p += k;
+ *p += k + 1;
return 1;
}
diff --git a/src/journal/test-journal-syslog.c b/src/journal/test-journal-syslog.c
index 7294cde032..120477cc9f 100644
--- a/src/journal/test-journal-syslog.c
+++ b/src/journal/test-journal-syslog.c
@@ -4,6 +4,7 @@
#include "journald-syslog.h"
#include "macro.h"
#include "string-util.h"
+#include "syslog-util.h"
static void test_syslog_parse_identifier(const char *str,
const char *ident, const char *pid, const char *rest, int ret) {
@@ -19,6 +20,17 @@ static void test_syslog_parse_identifier(const char *str,
assert_se(streq(buf, rest));
}
+static void test_syslog_parse_priority(const char *str, int priority, int ret) {
+ const char *buf = str;
+ int priority2, ret2;
+
+ ret2 = syslog_parse_priority(&buf, &priority2, false);
+
+ assert_se(ret == ret2);
+ if (ret2 == 1)
+ assert_se(priority == priority2);
+}
+
int main(void) {
test_syslog_parse_identifier("pidu[111]: xxx", "pidu", "111", "xxx", 11);
test_syslog_parse_identifier("pidu: xxx", "pidu", NULL, "xxx", 6);
@@ -33,5 +45,13 @@ int main(void) {
test_syslog_parse_identifier("pidu: ", "pidu", NULL, "", 6);
test_syslog_parse_identifier("pidu : ", NULL, NULL, "pidu : ", 0);
+ test_syslog_parse_priority("<>", 0, 0);
+ test_syslog_parse_priority("<>aaa", 0, 0);
+ test_syslog_parse_priority("<aaaa>", 0, 0);
+ test_syslog_parse_priority("<aaaa>aaa", 0, 0);
+ test_syslog_parse_priority(" <aaaa>", 0, 0);
+ test_syslog_parse_priority(" <aaaa>aaa", 0, 0);
+ /* TODO: add test cases of valid priorities */
+
return 0;
}