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