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From: Dominic Chen <d.c.ddcc@gmail.com>
To: Rich Felker <dalias@libc.org>
Cc: musl@lists.openwall.com
Subject: Re: [musl] SIGSEGV with TEXTREL
Date: Fri, 25 Sep 2020 20:32:43 -0400	[thread overview]
Message-ID: <b80c7eea-8252-9de4-9e1b-aa21021de7f3@gmail.com> (raw)
In-Reply-To: <20200925224607.GP3265@brightrain.aerifal.cx>

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


  reply	other threads:[~2020-09-26  2:53 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-25  3:50 Dominic Chen
2020-09-25  9:37 ` Szabolcs Nagy
2020-09-25 18:58   ` Rich Felker
2020-09-25 20:13   ` Dominic Chen
2020-09-25 20:49     ` Markus Wichmann
2020-09-25 22:46     ` Rich Felker
2020-09-26  0:32       ` Dominic Chen [this message]
2020-09-26  4:14         ` Fangrui Song
2020-09-26  9:09           ` Szabolcs Nagy

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