From: Alan Modra <amodra@gmail.com>
To: "Martin Liška" <mliska@suse.cz>
Cc: binutils@sourceware.org
Subject: Re: pe_ILF_object_p and bfd_check_format_matches
Date: Thu, 13 Apr 2023 20:28:59 +0930 [thread overview]
Message-ID: <ZDfgc6h0ldWA/l7a@squeak.grove.modra.org> (raw)
In-Reply-To: <e8047f42-0358-dc98-4949-6b92a4dbd8e5@suse.cz>
On Thu, Apr 13, 2023 at 11:55:10AM +0200, Martin Liška wrote:
> On 4/13/23 04:58, Alan Modra via Binutils wrote:
> > |The last patch wasn't quite correct.|
>
> Heh, I've just noticed that this change caused a crash when ar is called for ~150 files:
>
> ==27734== Invalid read of size 4
> ==27734== at 0x4D576DD: ftello (in /usr/lib64/libc.so.6)
> ==27734== by 0x4958E18: close_one (in /usr/lib64/libbfd-2.40.50.20230412-797.so)
Yes, that will be this part:
> > It is also not correct to restore abfd->iostream unless the iovec
> > changes. abfd->iostream is a FILE* when using cache_iovec, and if
> > the file has been closed and reopened the iostream may have changed.
I saw a similar invalid read in fseeko, and a double free in fclose
due to the above.
--
Alan Modra
Australia Development Lab, IBM
next prev parent reply other threads:[~2023-04-13 10:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-12 1:32 Alan Modra
2023-04-13 2:58 ` Alan Modra
2023-04-13 9:55 ` Martin Liška
2023-04-13 10:58 ` Alan Modra [this message]
2023-04-13 12:53 ` Martin Liška
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