From: Mark Wielaard <mark@klomp.org>
To: Florian Weimer <fweimer@redhat.com>
Cc: elfutils-devel@sourceware.org,
Panu Matilainen <pmatilai@laiskiainen.org>
Subject: Re: [PATCH] elfclassify tool
Date: Mon, 29 Jul 2019 14:24:00 -0000 [thread overview]
Message-ID: <20190729142419.GB2881@wildebeest.org> (raw)
In-Reply-To: <87ef296xir.fsf@oldenburg2.str.redhat.com>
On Mon, Jul 29, 2019 at 10:43:56AM +0200, Florian Weimer wrote:
> * Mark Wielaard:
>
> > + if (elf == NULL)
> > + {
> > + /* This likely means it just isn't an ELF file, probably not a
> > + real issue, but warn if verbose reporting. */
> > + if (verbose > 0)
> > + fprintf (stderr, "warning: %s: %s\n", current_path, elf_errmsg (-1));
> > + return false;
> > + }
>
> Is it possible to distinguish the error from a memory allocation error?
> It would be wrong to mis-classify a file just because the system is low
> on memory.
You are right this is not the proper way to report the issue.
Normally, when just using elf_begin, a NULL return should be reported
through elf_issue (which will set the issues flag).
But, because I added -z, we are using either elf_begin or
dwelf_elf_begin. dwelf_elf_begin will return NULL (instead of a an
empty (ELF_K_NONE) Elf descriptor when there is an issue, or the
(decompressed) file wasn't an ELF file.
So we should split the error reporting. If we called elf_begin and get
NULL we should call elf_issue to report the proper issue.
If we called dwefl_elf_begin and we get NULL, I am not sure yet what
the proper way is to detect whether it is a real issue, or "just" not
a (decompressed) ELF file. I am afraid the current handling is the
best we can do.
Maybe we can fix dwelf_elf_begin to return an empty (ELF_K_NONE) Elf
descriptor if there was no issue, but the (decompressed) file wasn't
an ELF file.
Cheers,
Mark
next prev parent reply other threads:[~2019-07-29 14:24 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-12 15:38 Florian Weimer
2019-04-15 15:39 ` Mark Wielaard
2019-04-16 11:38 ` Florian Weimer
2019-04-18 11:17 ` Florian Weimer
2019-07-19 12:47 ` Mark Wielaard
2019-07-19 13:43 ` Dmitry V. Levin
2019-07-19 14:21 ` Mark
2019-07-19 18:35 ` Dmitry V. Levin
2019-07-19 21:00 ` Florian Weimer
2019-07-19 21:23 ` Dmitry V. Levin
2019-07-19 21:36 ` Mark Wielaard
2019-07-19 22:57 ` Dmitry V. Levin
2019-07-20 21:51 ` Mark Wielaard
2019-07-25 22:39 ` [PATCH] elfclassify: Add --library classification Mark Wielaard
2019-07-26 22:53 ` Dmitry V. Levin
2019-07-26 23:04 ` [PATCH] elfclassify tool Dmitry V. Levin
2019-07-27 11:54 ` Mark Wielaard
2019-07-20 21:40 ` Mark Wielaard
2019-07-22 15:55 ` Florian Weimer
2019-07-26 22:11 ` Mark Wielaard
2019-07-29 8:44 ` Florian Weimer
2019-07-29 14:24 ` Mark Wielaard [this message]
2019-08-11 23:38 ` Mark Wielaard
2019-08-12 8:14 ` Florian Weimer
2019-08-12 15:18 ` Mark Wielaard
2019-07-29 9:16 ` Florian Weimer
2019-07-29 14:34 ` Mark Wielaard
2019-07-29 14:38 ` Florian Weimer
2019-08-13 9:44 ` Mark Wielaard
2019-08-13 11:42 ` Mark Wielaard
2019-08-14 20:46 ` [PATCH] config/elfutils.spec.in: package eu-elfclassify Dmitry V. Levin
2019-08-15 7:33 ` Mark Wielaard
2019-07-29 9:22 ` [PATCH] elfclassify tool Florian Weimer
2019-07-29 14:40 ` Mark Wielaard
2019-07-29 14:42 ` Florian Weimer
2019-07-19 13:24 ` Mark Wielaard
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