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Date: Fri, 31 Jan 2020 11:35:08 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Static linking is broken after creation of DT_TEXTREL
segment
On Fri, Jan 31, 2020 at 03:47:48PM +0100, Markus Wichmann wrote:
> > Assuming this is at startup, that's not a possibility; no application
> > code has run yet.
>
> Unfortunately, signal mask and ignore dispositions are inherited across
> execve(). A tool that ignores or blocks specific signals before execing
> the rest of its command line is therefore possible. I seem to remember
> such a tool, but cannot remember its name. A cursory search on the
> Internet failed to turn up anything.
For synchronously-generated SIGSEGV or SIGILL from faults, all that
ignoring or blocking them does is ensure that a handler can't run and
that they terminate the process (this is implementation-specific but a
Linux contract and The Right Thing to do). Signal handlers of course
cannot be inherited across exec; they revert to SIG_DFL.
Rich
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