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stty: fix bb_common_bufsiz1 use in NOEXEC

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function                                             old     new   delta
stty_main                                           1211    1221     +10
do_display                                           379     370      -9

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-08-06 20:55:56 +02:00
parent 035e71578e
commit 184c738582
3 changed files with 12 additions and 9 deletions
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2
NOFORK_NOEXEC.lst
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@ -327,7 +327,7 @@ softlimit - noexec. spawner
sort - noexec. runner
split - runner
ssl_client - longterm
start-stop-daemon
start-stop-daemon - not noexec: uses bb_common_bufsiz1
stat - nofork candidate(needs fewer allocs)
strings - runner
stty - noexec. nofork candidate: has no allocs or opens except xmove_fd(xopen("-F DEVICE"),STDIN). tcsetattr(STDIN) is not a problem: it would work the same across processes sharing this fd

10
coreutils/stty.c
View File

@ -782,12 +782,12 @@ struct globals {
unsigned max_col;
/* Current position, to know when to wrap */
unsigned current_col;
char buf[10];
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { \
G.device_name = bb_msg_standard_input; \
G.max_col = 80; \
G.current_col = 0; /* we are noexec, must clear */ \
} while (0)
static void set_speed_or_die(enum speed_setting type, const char *arg,
@ -1018,6 +1018,8 @@ static void do_display(const struct termios *mode, int all)
for (i = 0; i != CIDX_min; ++i) {
char ch;
char buf10[10];
/* If swtch is the same as susp, don't print both */
#if VSWTCH == VSUSP
if (i == CIDX_swtch)
@ -1033,10 +1035,10 @@ static void do_display(const struct termios *mode, int all)
#endif
ch = mode->c_cc[control_info[i].offset];
if (ch == _POSIX_VDISABLE)
strcpy(G.buf, "<undef>");
strcpy(buf10, "<undef>");
else
visible(ch, G.buf, 0);
wrapf("%s = %s;", nth_string(control_name, i), G.buf);
visible(ch, buf10, 0);
wrapf("%s = %s;", nth_string(control_name, i), buf10);
}
#if VEOF == VMIN
if ((mode->c_lflag & ICANON) == 0)

1
debianutils/start_stop_daemon.c
View File

@ -79,6 +79,7 @@ Misc options:
//config: -N|--nicelevel N
//applet:IF_START_STOP_DAEMON(APPLET_ODDNAME(start-stop-daemon, start_stop_daemon, BB_DIR_SBIN, BB_SUID_DROP, start_stop_daemon))
/* not NOEXEC: uses bb_common_bufsiz1 */
//kbuild:lib-$(CONFIG_START_STOP_DAEMON) += start_stop_daemon.o