From aa3576a29b9619f4e1c1b131f5db53ad2bc2cb00 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Mon, 22 Aug 2016 19:54:12 +0200 Subject: hush: fix "redirects can close script fd" bug Signed-off-by: Denys Vlasenko --- shell/hush_test/hush-misc/redir_script.tests | 29 ++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100755 shell/hush_test/hush-misc/redir_script.tests (limited to 'shell/hush_test/hush-misc/redir_script.tests') diff --git a/shell/hush_test/hush-misc/redir_script.tests b/shell/hush_test/hush-misc/redir_script.tests new file mode 100755 index 000000000..ccc497d7b --- /dev/null +++ b/shell/hush_test/hush-misc/redir_script.tests @@ -0,0 +1,29 @@ +# Builds a " 3>&- 4>&-" string. +# Note: one of these fds is a directory opened to /proc/self/fd +# for globbing. It is unwanted, but I don't know how to filter it out. +find_fds() { + fds="" + for f in /proc/self/fd/*; do + test "$f" = "/proc/self/fd/0" && continue + test "$f" = "/proc/self/fd/1" && continue + test "$f" = "/proc/self/fd/2" && continue + fds="$fds ${f##*/}>&-" + done +} + +find_fds +fds1="$fds" + +# One of the fds is open to the script body +# Close it while executing something. +eval "find_fds $fds" + +# Shell should not lose that fd. Did it? +find_fds +test x"$fds1" = x"$fds" && { echo "Ok: script fd is not closed"; exit 0; } + +echo "Bug: script fd is closed" +echo "fds1:$fds1" +echo "fds2:$fds" +exit 1 + -- cgit v1.2.3