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| author | Denys Vlasenko | 2017-08-06 18:17:58 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2017-08-06 18:17:58 +0200 |
| commit | 341ce0a31eb2bdc352ef61df1954983c5235c818 (patch) | |
| tree | 02c8618e4ca9cd1f7b61333b5f73be3b70bde08f | |
| parent | 97b738d359c0398942d0dc4301415a2fe814eace (diff) | |
| download | busybox-341ce0a31eb2bdc352ef61df1954983c5235c818.zip busybox-341ce0a31eb2bdc352ef61df1954983c5235c818.tar.gz | |
setlogcons: make it NOEXEC, better --help text
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | NOFORK_NOEXEC.lst | 2 | ||||
| -rw-r--r-- | console-tools/setlogcons.c | 20 |
2 files changed, 17 insertions, 5 deletions
diff --git a/NOFORK_NOEXEC.lst b/NOFORK_NOEXEC.lst index 30690af..8145e25 100644 --- a/NOFORK_NOEXEC.lst +++ b/NOFORK_NOEXEC.lst @@ -308,7 +308,7 @@ setarch - noexec. spawner setconsole setfont setkeycodes -setlogcons +setlogcons - noexec setpriv - spawner, changes state, let's play safe and not be noexec setserial - noexec setsid - spawner, uses fork_or_rexec() [not audited to work in noexec], let's play safe and not be noexec diff --git a/console-tools/setlogcons.c b/console-tools/setlogcons.c index 1b5814e..6778a4d 100644 --- a/console-tools/setlogcons.c +++ b/console-tools/setlogcons.c @@ -15,14 +15,26 @@ //config: help //config: This program redirects the output console of kernel messages. -//applet:IF_SETLOGCONS(APPLET(setlogcons, BB_DIR_USR_SBIN, BB_SUID_DROP)) +//applet:IF_SETLOGCONS(APPLET_NOEXEC(setlogcons, setlogcons, BB_DIR_USR_SBIN, BB_SUID_DROP, setlogcons)) //kbuild:lib-$(CONFIG_SETLOGCONS) += setlogcons.o //usage:#define setlogcons_trivial_usage //usage: "[N]" //usage:#define setlogcons_full_usage "\n\n" -//usage: "Redirect the kernel output to console N. Default:0 (current console)" +//usage: "Pin kernel output to VT console N. Default:0 (do not pin)" + +// Comment from kernel source: +/* ... + * By default, the kernel messages are always printed on the current virtual + * console. However, the user may modify that default with the + * TIOCL_SETKMSGREDIRECT ioctl call. + * + * This function sets the kernel message console to be @new. It returns the old + * virtual console number. The virtual terminal number 0 (both as parameter and + * return value) means no redirection (i.e. always printed on the currently + * active console). + */ #include "libbb.h" @@ -33,8 +45,8 @@ int setlogcons_main(int argc UNUSED_PARAM, char **argv) char fn; char subarg; } arg = { - 11, /* redirect kernel messages */ - 0 /* to specified console (current as default) */ + 11, /* redirect kernel messages (TIOCL_SETKMSGREDIRECT) */ + 0 }; if (argv[1]) |