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From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: [musl] Static linking is broken after creation of DT_TEXTREL segment
Date: Fri, 31 Jan 2020 11:35:08 -0500	[thread overview]
Message-ID: <20200131163508.GH1663@brightrain.aerifal.cx> (raw)
In-Reply-To: <20200131144748.GL2020@voyager>

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

  reply	other threads:[~2020-01-31 16:35 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-29 18:41 Андрей Аладьев
2020-01-29 19:19 ` Markus Wichmann
2020-01-29 19:38   ` Markus Wichmann
2020-01-29 20:48     ` Rich Felker
2020-01-29 20:08   ` Андрей Аладьев
2020-01-30 17:02     ` Markus Wichmann
2020-01-31  4:24       ` Rich Felker
2020-01-31 14:47         ` Markus Wichmann
2020-01-31 16:35           ` Rich Felker [this message]
2020-01-31 15:16       ` Андрей Аладьев
2020-01-31 16:40         ` Rich Felker
2020-01-31 17:51           ` Андрей Аладьев
2020-01-31 18:01             ` Rich Felker
2020-01-31 19:11               ` Андрей Аладьев
2020-02-03  3:10       ` Rich Felker
2020-02-03  4:05         ` Rich Felker
2020-02-03  4:32         ` Markus Wichmann
2020-02-03  4:40           ` Rich Felker
2020-01-29 20:53 ` Rich Felker
2020-01-29 21:10   ` Szabolcs Nagy
2020-01-29 21:35     ` Андрей Аладьев
2020-01-29 21:46       ` Rich Felker
2020-01-29 23:10         ` Андрей Аладьев
2020-01-29 23:20       ` Szabolcs Nagy
2020-01-29 21:14   ` Андрей Аладьев
2020-01-29 21:43     ` Rich Felker

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