mirror of
https://github.com/sheumann/hush.git
synced 2024-07-16 06:29:01 +00:00
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>
|
||
|---|---|---|
| .. | ||
| hush-arith | ||
| hush-bugs | ||
| hush-glob | ||
| hush-leak | ||
| hush-misc | ||
| hush-parsing | ||
| hush-psubst | ||
| hush-read | ||
| hush-trap | ||
| hush-vars | ||
| hush-z_slow | ||
| .gitignore | ||
| run-all | ||