systemd/0056-fileio-quote-more-shell-characters-in-envfiles.patch

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From b91985eca0db632daecf6e20b1d3718f0f884389 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mantas=20Mikul=C4=97nas?= <grawity@gmail.com>
Date: Sun, 13 Jul 2014 18:49:00 +0300
Subject: [PATCH] fileio: quote more shell characters in envfiles
Turns out, making strings shell-proof is harder than expected:
# machinectl set-hostname "foo|poweroff" && . /etc/machine-info
(This could be simplified by quoting *and* escaping all characters,
which is harmless in shell but unnecessary.)
(cherry picked from commit 0ce5a80601597fe4d1a715a8f70ce8d5ccaa2d86)
---
src/shared/fileio.c | 4 ++--
src/shared/util.h | 6 ++++++
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/shared/fileio.c b/src/shared/fileio.c
index b1de5908c5..d22770b772 100644
--- a/src/shared/fileio.c
+++ b/src/shared/fileio.c
@@ -738,11 +738,11 @@ static void write_env_var(FILE *f, const char *v) {
p++;
fwrite(v, 1, p-v, f);
- if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE "\'\"\\`$")) {
+ if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
fputc('\"', f);
for (; *p; p++) {
- if (strchr("\'\"\\`$", *p))
+ if (strchr(SHELL_NEED_ESCAPE, *p))
fputc('\\', f);
fputc(*p, f);
diff --git a/src/shared/util.h b/src/shared/util.h
index 7124e51d90..64b9fc6884 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -93,6 +93,12 @@
#define COMMENTS "#;"
#define GLOB_CHARS "*?["
+/* What characters are special in the shell? */
+/* must be escaped outside and inside double-quotes */
+#define SHELL_NEED_ESCAPE "\"\\`$"
+/* can be escaped or double-quoted */
+#define SHELL_NEED_QUOTES SHELL_NEED_ESCAPE GLOB_CHARS "'()<>|&;"
+
#define FORMAT_BYTES_MAX 8
#define ANSI_HIGHLIGHT_ON "\x1B[1;39m"