Date: Mon, 19 Apr 2021 11:01:54 -0400 From: "David A. Wheeler" <dwheeler@...eeler.com> To: oss-security@...ts.openwall.com Cc: security@...ian.org Subject: Re: xscreensaver package caps gets raw socket > On Sat, 17 Apr 2021 at 07:41:15 -0700, Tavis Ormandy wrote: >> Oh, I also pitched using popen("/bin/ping" ..), but I think nobody is >> really convinced that will work, but I kinda like it :) On Apr 18, 2021, at 8:25 AM, Simon McVittie <smcv@...ian.org> wrote: > That's consistent with the principle of least-privilege, and the widely > cited Unix philosophy of having programs that do one thing well. > > If you need to gain privileges, then I think that's a much, much better > approach - ideally a new ping-like program that prints a machine-readable > syntax rather than having to screen-scrape human-readable output, but > if that's not available then ping itself is the next best thing. I agree, running “ping” in a separate process is FAR better than giving the “main” process extra permissions it doesn’t actually need. You’d have to be careful about the parameters sent, but that’s necessary anyway. I don’t see the problem of calling /bin/ping, that sounds like the right answer. Scraping is undesirable, but sometimes needed. If this is a common need, a long-term solution might be to create an option on ping to generate a standard format that’s easier to machine-parse. --- David A. Wheeler
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