RE: [PATCH v2] selftests/lkdtm: Use /bin/sh not $SHELL

From: Kees Cook

Sent: 23 June 2021 23:47

On Wed, Jun 23, 2021 at 04:27:47PM +0000, David Laight wrote:

...

...

You can probably even do:

echo "$test" | /bin/sh -c cat >$TRIGGER || true

(moving the redirect to the outer shell).

Actually, it looks like the "write" is already happening in the exec'd process, so this can just be:

echo "$test" | cat >$TRIGGER || true

But it still can't be:

echo "$test" >$TRIGGER

which is what I had over-engineered a solution to. :)

That one fails because echo is the shell builtin. But: /bin/echo "$test" >$TRIGGER should be fine.

Quite where the original came from I not sure I want to find out.

David

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