leaks: does not free allocated memory or opened fds
alloc+xfunc: xmalloc, then xfunc - leaks memory if xfunc dies
open+xfunc: opens fd, then calls xfunc - fd is leaked if xfunc dies
+talks to network/serial/etc: it's not known how long the delay can be,
+ it's reasonable to expect it might be many seconds
+ (even if usually it is not), so ^C has to work
runner: sometimes may run for long(ish) time, and/or works with network:
^C has to work (cat BIGFILE, chmod -R, ftpget, nc)
is very typical, and speeding up this common use via NOEXEC is useful.
IOW: rm is "interactive", but not "longterm".
+Interesting example of an applet which can be NOFORK but if not,
+then should not be NOEXEC, is "usleep". As NOFORK, it amount to simply
+nanosleep()ing in the calling program (usually shell). No memory wasted.
+But if ran as NOEXEC, it would create a potentially long-term process,
+which would be taking more memory because it did not exec
+and did not free much of the copied memory of the parent
+(COW helps with this only as long as parent doesn't modify its memory).
+
[ - NOFORK
[[ - NOFORK
adjtimex - NOFORK
ar - runner
arch - NOFORK
-arp - runner, needs ^C: arp -n talks to DNS servers
+arp - talks to network: arp -n queries DNS
arping - longterm
ash - interactive, longterm
awk - noexec. runner
bunzip2 - runner
bzcat - runner
bzip2 - runner
-cal - runner: cal -n9999
-cat - runner
-chat - needs ^C to work
+cal - noexec. can be runner: cal -n9999
+cat - runner: cat HUGEFILE
+chat - longterm (when used as intended - talking to modem over stdin/out)
chattr - noexec. runner
chgrp - noexec. runner
chmod - noexec. runner
chown - noexec. runner
-chpasswd - runner (list of "user:password"s from stdin)
+chpasswd - longterm? (list of "user:password"s from stdin)
chpst - noexec. spawner
chroot - noexec. spawner
chrt - noexec. spawner
cmp - runner
comm - runner
conspy - interactive, longterm
-cp - noexec. runner
+cp - noexec. sometimes runner
cpio - runner
crond - daemon
crontab - longterm (runs $EDITOR), leaks: open+xasprintf
cttyhack - noexec. spawner
cut - noexec. runner
date - noexec. nofork candidate(needs to stop messing up env, free xasprintf result, not use xfuncs after xasprintf)
-dc - runner (eats stdin if no params)
+dc - longterm (eats stdin if no params)
dd - noexec. runner
deallocvt - noexec. leaks: get_console_fd_or_die() may open a new fd, or return one of stdio fds
delgroup - noexec. leaks
dirname - NOFORK
dmesg - runner
dnsd - daemon
-dnsdomainname - noexec. needs ^C (may talk to DNS servers, which may be down)
+dnsdomainname - noexec. talks to network (may query DNS)
dos2unix - noexec. runner
dpkg - runner
du - runner
dumpkmap - noexec. leaks: get_console_fd_or_die() may open a new fd, or return one of stdio fds
-dumpleases - leaks: open+xread
+dumpleases - noexec. leaks: open+xread
echo - NOFORK
ed - interactive, longterm
egrep - longterm runner ("CMD | egrep ..." may run indefinitely, better to exec to conserve memory)
-eject - leaks: open+ioctl_or_perror_and_die, changes state (moves fds)
+eject - hardware, leaks: open+ioctl_or_perror_and_die, changes state (moves fds)
env - noexec. spawner, changes state (env)
envdir - noexec. spawner
envuidgid - noexec. spawner
expand - runner
-expr - leaks: nested allocs
-factor - runner (eats stdin if no params)
+expr - noexec. leaks: nested allocs
+factor - longterm (eats stdin if no params)
fakeidentd - daemon
false - NOFORK
fatattr - noexec. leaks: open+xioctl, complex
fbset - hardware, leaks: open+xfunc
fbsplash - runner, longterm
fdflush - hardware, leaks: open+ioctl_or_perror_and_die
-fdformat - hardware, needs ^C (floppy may be unresponsive), longterm
+fdformat - hardware, longterm
fdisk - interactive, longterm
fgconsole - noexec. leaks: get_console_fd_or_die() may open a new fd, or return one of stdio fds
fgrep - longterm runner ("CMD | fgrep ..." may run indefinitely, better to exec to conserve memory)
flashcp - hardware
flock - spawner, changes state (file locks), let's play safe and not be noexec
fold - noexec. runner
-free - noexec. nofork candidate(struct globals, needs to close /proc/meminfo fd)
-freeramdisk - leaks: open+ioctl_or_perror_and_die
+free - NOFORK
+freeramdisk - noexec. leaks: open+ioctl_or_perror_and_die
fsck - interactive, longterm
fsck.minix - needs ^C
fsfreeze - noexec. leaks: open+xioctl
hdparm - hardware
head - noexec. runner
hexdump - noexec. runner
+hexedit - interactive, longterm
hostid - NOFORK
-hostname - noexec. needs ^C (may talk to DNS servers, which may be down)
+hostname - noexec. talks to network (hostname -d may query DNS)
httpd - daemon
hush - interactive, longterm
hwclock - hardware (xioctl(RTC_RD_TIME))
i2cget - hardware
i2cset - hardware
id - noexec
-ifconfig - leaks: xsocket+ioctl_or_perror_and_die
-ifenslave - leaks: xsocket+bb_perror_msg_and_die
+ifconfig - hardware? (mem_start NN io_addr NN irq NN), leaks: xsocket+ioctl_or_perror_and_die
+ifenslave - noexec. leaks: xsocket+bb_perror_msg_and_die
ifplugd - daemon
inetd - daemon
init - daemon
install - runner
ionice - noexec. spawner
iostat - longterm: "iostat 1" runs indefinitely
-ip - noexec candidate
-ipaddr - noexec candidate
-ipcalc - noexec candidate
-ipcrm - noexec candidate
-ipcs - noexec candidate
-iplink - noexec candidate
-ipneigh - noexec candidate
-iproute - noexec candidate
-iprule - noexec candidate
-iptunnel - noexec candidate
+ip - noexec
+ipaddr - noexec
+ipcalc - noexec. ipcalc -h talks to network
+ipcrm - noexec
+ipcs - noexec
+iplink - noexec
+ipneigh - noexec
+iproute - noexec
+iprule - noexec
+iptunnel - noexec
kbd_mode - noexec. leaks: xopen_nonblocking+xioctl
kill - NOFORK
killall - NOFORK
logger - runner
login - suid, interactive, longterm
logname - NOFORK
-losetup - complex
+losetup - noexec. complex
lpd - daemon
lpq - runner
lpr - runner
mdev - daemon
mesg - NOFORK
microcom - interactive, longterm
+minips - noexec
mkdir - NOFORK
mkdosfs - needs ^C
mke2fs - needs ^C
mountpoint - noexec. leaks: option -n "print dev name": find_block_device -> readdir+xstrdup
mpstat - longterm: "mpstat 1" runs indefinitely
mt - hardware
-mv - noexec candidate, runner
+mv - noexec. sometimes runner
nameif - noexec. openlog(), leaks: config_open2+ioctl_or_perror_and_die
nbd-client - noexec
nc - runner
nohup - noexec. spawner
nproc - NOFORK
ntpd - daemon
+nuke - noexec
od - runner
openvt - longterm: spawns a child and waits for it
partprobe - noexec. leaks: open+ioctl_or_perror_and_die(BLKRRPART)
powertop - interactive, longterm
printenv - NOFORK
printf - NOFORK
-ps - looks for AT_CLKTCK elf aux vector, therefore can't be noexec
-pscan - longterm
+ps - noexec
+pscan - talks to network
pstree - noexec
pwd - NOFORK
pwdx - NOFORK
raidautorun - noexec. very simple. leaks: open+xioctl
-rdate - needs ^C (may talk to DNS servers, which may be down)
-rdev - leaks: find_block_device -> readdir+xstrdup
+rdate - talks to network
+rdev - noexec. leaks: find_block_device -> readdir+xstrdup
readlink - NOFORK
readprofile - reads /boot/System.map and /proc/profile, better to free more memory by execing?
realpath - NOFORK
renice - noexec. nofork candidate(uses getpwnam, is that ok?)
reset - noexec. spawner (execs "stty")
resize - noexec. changes state (signal handlers)
+resume - noexec
rev - runner
rm - noexec. rm -i interactive
rmdir - NOFORK
rmmod - noexec
-route - needs ^C (may talk to DNS servers, which may be down)
+route - talks to network (may query DNS to convert IPs to names)
rpm - runner
rpm2cpio - runner
rtcwake - longterm: puts system to sleep, optimizing this for speed is pointless
+run-init - spawner, rare, changes state (oh yes), execing may be important to free binary's inode
run-parts - longterm
runlevel - noexec. can be nofork if "endutxent()" is called unconditionally, but too rare to bother?
runsv - daemon
seq - noexec. runner
setarch - noexec. spawner
setconsole - noexec
+setfattr - noexec
setfont - noexec. leaks a lot of stuff
setkeycodes - noexec
setlogcons - noexec
shred - runner
shuf - noexec. runner
slattach - longterm (may sleep forever), uses bb_common_bufsiz1
-sleep - runner, longterm
+sleep - longterm. Could be nofork, if not the problem of "killall sleep" not killing it.
smemcap - runner
softlimit - noexec. spawner
sort - noexec. runner
unzip - runner
uptime - noexec. nofork candidate(is getutxent ok?)
users - noexec. nofork candidate(is getutxent ok?)
-usleep - NOFORK
+usleep - NOFORK. But what about "killall usleep"?
uudecode - runner
uuencode - runner
-vconfig - leaks: xsocket+ioctl_or_perror_and_die
+vconfig - noexec. leaks: xsocket+ioctl_or_perror_and_die
vi - interactive, longterm
vlock - suid
-volname - runner
+volname - hardware (reads CDROM, this can take long-ish if need to spin up)
w - noexec. nofork candidate(is getutxent ok?)
wall - suid
watch - longterm
which - NOFORK
who - noexec. nofork candidate(is getutxent ok?)
whoami - NOFORK
-whois - needs ^C
+whois - talks to network
xargs - noexec. spawner
xxd - noexec. runner
xz - runner
projects / oweals / busybox.git / blobdiff