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authorDenys Vlasenko <vda.linux@googlemail.com>2017-08-09 19:51:17 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2017-08-09 19:51:17 +0200
commit3bc2317c610af0a34c665e0e84169caa2653ff41 (patch)
treef4f0a348d9c568e0abf3aec887dab1d789c4f56e
parent890bd5de5114cff73928f9bd405ed7fb6e579015 (diff)
downloadbusybox-3bc2317c610af0a34c665e0e84169caa2653ff41.tar.gz
Update NOFORK_NOEXEC.lst
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--NOFORK_NOEXEC.lst16
1 files changed, 12 insertions, 4 deletions
diff --git a/NOFORK_NOEXEC.lst b/NOFORK_NOEXEC.lst
index 063d7cd48..fd5b35838 100644
--- a/NOFORK_NOEXEC.lst
+++ b/NOFORK_NOEXEC.lst
@@ -39,6 +39,14 @@ for users to keep it waiting for many minutes, whereas running "rm" in shell
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
@@ -181,8 +189,8 @@ iostat - longterm: "iostat 1" runs indefinitely
ip - noexec candidate
ipaddr - noexec candidate
ipcalc - noexec. ipcalc -h talks to network
-ipcrm - noexec candidate
-ipcs - noexec candidate
+ipcrm - noexec
+ipcs - noexec
iplink - noexec candidate
ipneigh - noexec candidate
iproute - noexec candidate
@@ -327,7 +335,7 @@ showkey - interactive, longterm
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
@@ -397,7 +405,7 @@ unxz - 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 - noexec. leaks: xsocket+ioctl_or_perror_and_die