diff options
| author | Lennart Poettering <lennart@poettering.net> | 2016-06-09 10:01:16 +0200 |
|---|---|---|
| committer | Daniel Mack <github@zonque.org> | 2016-06-09 10:01:16 +0200 |
| commit | 1ff74fb6e3243a2ade9ac38aa5effccb25432ad1 (patch) | |
| tree | 4ae6d6ffca3550b4bdef36569935a01675f48c8a | |
| parent | 867476a30a01aeb22cc696bec9f9df788ca58ac1 (diff) | |
execute: check whether the specified fd is a tty before chowning/chmoding it (#3457)
Let's add an extra safety check before we chmod/chown a TTY to the right user,
as we might end up having connected something to STDIN/STDOUT that is actually
not a TTY, even though this might have been requested, due to permissive
StandardInput= settings or transient service activation with fds passed in.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=85255
| -rw-r--r-- | src/core/execute.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/core/execute.c b/src/core/execute.c index 2cef70e668..e718c43df9 100644 --- a/src/core/execute.c +++ b/src/core/execute.c @@ -552,6 +552,10 @@ static int chown_terminal(int fd, uid_t uid) { assert(fd >= 0); + /* Before we chown/chmod the TTY, let's ensure this is actually a tty */ + if (isatty(fd) < 1) + return 0; + /* This might fail. What matters are the results. */ (void) fchown(fd, uid, -1); (void) fchmod(fd, TTY_MODE); |