diff options
| author | Denys Vlasenko <vda.linux@googlemail.com> | 2017-08-04 19:16:01 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2017-08-04 19:16:01 +0200 |
| commit | 6514785f95878911b3ec88e2367234df74c14cd4 (patch) | |
| tree | d5212cbe1de8c0fe15cb42e0c83c00ea6d77403c /util-linux | |
| parent | 947b2391c07f8a11f7bd4658f77cd03172fc221a (diff) | |
| download | busybox-6514785f95878911b3ec88e2367234df74c14cd4.tar.gz | |
mesg: make in NOFORK
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux')
| -rw-r--r-- | util-linux/mesg.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/util-linux/mesg.c b/util-linux/mesg.c index c4371eb24..91c05317e 100644 --- a/util-linux/mesg.c +++ b/util-linux/mesg.c @@ -26,7 +26,7 @@ //config: If you set this option to N, "mesg y" will enable writing //config: by anybody at all. This is not recommended. -//applet:IF_MESG(APPLET(mesg, BB_DIR_USR_BIN, BB_SUID_DROP)) +//applet:IF_MESG(APPLET_NOFORK(mesg, mesg, BB_DIR_USR_BIN, BB_SUID_DROP, mesg)) //kbuild:lib-$(CONFIG_MESG) += mesg.o @@ -60,10 +60,15 @@ int mesg_main(int argc UNUSED_PARAM, char **argv) bb_show_usage(); } + /* We are a NOFORK applet. + * (Not that it's very useful, but code is trivially NOFORK-safe). + * Play nice. Do not leak anything. + */ + if (!isatty(STDIN_FILENO)) bb_error_msg_and_die("not a tty"); - xfstat(STDIN_FILENO, &sb, "stderr"); + xfstat(STDIN_FILENO, &sb, "stdin"); if (c == 0) { puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n"); return EXIT_SUCCESS; |