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Message-ID: <b80c7eea-8252-9de4-9e1b-aa21021de7f3@gmail.com>
Date: Fri, 25 Sep 2020 20:32:43 -0400
From: Dominic Chen <d.c.ddcc@...il.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: SIGSEGV with TEXTREL
On 9/25/2020 6:46 PM, Rich Felker wrote:
>
> The right way to make this more friendly, I think, would be tracking
> the writable mapping range for each DSO (technically this is
> incomplete since it could be multiple ranges, but in that case we'd
> just take the convex hull of them and accept false negatives because
> anything else is almost surely too big a performance hit), and
> erroring out before processing a relocation at an address that's not
> writable for its DSO. This would also go part of the way towards
> making it possible for ldd to process untrusted files.
I agree that that seems to be a better solution, and it was also
discussed in the previous mailing list thread. But my point is just that
given how this issue has been reoccurring, I think it'd be useful to do
something now (e.g. emit a non-fail warning if TEXTRELs are present),
rather than deferring any changes.
Thanks,
Dominic
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