systemd/SOURCES/0106-bus-socket-Fix-line_begins-to-accept-word-matching-f.patch

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2019-08-05 15:03:40 +00:00
From 94b18b8123b5d957ed84e4aa8e268b60f5427821 Mon Sep 17 00:00:00 2001
From: Filipe Brandenburger <filbranden@google.com>
Date: Tue, 17 Jul 2018 11:32:40 -0700
Subject: [PATCH] bus-socket: Fix line_begins() to accept word matching full
string
The switch to memory_startswith() changed the logic to only look for a space or
NUL byte after the matched word, but matching the full size should also be
acceptable.
This changed the behavior of parsing of "AUTH\r\n", where m will be set to 4,
since even though the word will match, the check for it being followed by ' '
or NUL will make line_begins() return false.
Tested:
- Using netcat to connect to the private socket directly:
$ echo -ne '\0AUTH\r\n' | sudo nc -U /run/systemd/private
REJECTED EXTERNAL ANONYMOUS
- Running the Ignition blackbox test:
$ sudo sh -c 'PATH=$PWD/bin/amd64:$PATH ./tests.test'
PASS
Fixes: d27b725abf64a19a6b2f99332b663f17ad046771
(cherry picked from commit 3f10c66270b74530339b3f466c43874bb40c210f)
Resolves: #1692991
---
src/libsystemd/sd-bus/bus-socket.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/src/libsystemd/sd-bus/bus-socket.c b/src/libsystemd/sd-bus/bus-socket.c
index b147a3843a..a5513d1ab5 100644
--- a/src/libsystemd/sd-bus/bus-socket.c
+++ b/src/libsystemd/sd-bus/bus-socket.c
@@ -248,10 +248,7 @@ static bool line_begins(const char *s, size_t m, const char *word) {
const char *p;
p = memory_startswith(s, m, word);
- if (!p)
- return false;
-
- return IN_SET(*p, 0, ' ');
+ return p && (p == (s + m) || *p == ' ');
}
static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) {