215b0ca6e4
Run this in a "sh SCRIPT":
sha256sum /dev/null
echo END
sha256sum is a NOEXEC applet. It runs in a forked child. Then child exit()s.
By this time, entire script is read, and buffered in a FILE object
from fopen("SCRIPT"). But fgetc() did not consume entire input.
exit() lseeks back by -9 bytes, from <eof> to 'e' in 'echo'.
(this may be libc-specific).
This change of fd position *is shared with the parent*!
Now parent can read more, and it thinks there is another "echo END".
End result: two "echo END"s are run.
Fix this by _exit()ing instead.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Please see the LICENSE file for copyright information (GPLv2) libbb is BusyBox's utility library. All of this stuff used to be stuffed into a single file named utility.c. When I split utility.c to create libbb, some of the very oldest stuff ended up without their original copyright and licensing information (which is now lost in the mists of time). If you see something that you wrote that is mis-attributed, do let me know so we can fix that up. Erik Andersen <andersen@codepoet.org>