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sheel: improve comments on signal handling

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2017-08-04 14:28:16 +02:00
parent 3346b4afc5
commit 49e6bf2db9
4 changed files with 45 additions and 17 deletions
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4
NOFORK_NOEXEC.lst
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@@ -4,10 +4,12 @@ Why can't be NOFORK:
interactive: may wait for user input, ^C has to work
spawner: "tool PROG ARGS" which changes program's environment - must fork
changes state: e.g. environment, signal handlers
alloc+xfunc: xmalloc, then xfunc - leaks memory if xfunc dies
open+xfunc: opens fd, then calls xfunc - fd is leaked if xfunc dies
runner: sometimes may run for long(ish) time, and/or works with network:
^C has to work (cat BIGFILE, chmod -R, ftpget, nc)
"runners" can become eligible after hush is taught ^C to interrupt NOFORKs!
"runners" can become eligible after shell is taught ^C to interrupt NOFORKs!
Why can't be NOEXEC:
suid: runs under different uid - must fork+exec