From: Szabolcs Nagy <szabolcs.nagy@arm.com>
To: Lukasz Stelmach <l.stelmach@samsung.com>,
Palmer Dabbelt <palmer@dabbelt.com>
Cc: fw@deneb.enyo.de, libc-alpha@sourceware.org, schwab@suse.de,
maskray@google.com, fweimer@redhat.com,
adhemerval.zanella@linaro.org, joseph@codesourcery.com,
binutils@sourceware.org, m.pikula@partner.samsung.com,
m.szyprowski@samsung.com, k.lewandowsk@samsung.com
Subject: Re: global pointer gets overwritten with dlopen(3) on RISC-V
Date: Tue, 16 May 2023 08:59:51 +0100 [thread overview]
Message-ID: <ZGM39+VpzLQAESZ0@arm.com> (raw)
In-Reply-To: <oypijd5y8szs1c.fsf%l.stelmach@samsung.com>
The 05/16/2023 08:53, Lukasz Stelmach via Binutils wrote:
> No, the file we dlopen is an executable meant to work standalone. We
> dlopen it for testing and this setup has worked for us on different
> platforms (armv7l, aarch64, x86). We MAY have not encoutered an error
it is guaranteed broken on all those targets if the exe has
local exec TLS access. (initial exec TLS is broken too but
you may get lucky with that)
i think you can get into trouble with interposition, copy
relocs or canonical plts too.
but even if everything happens to work, it is just bad
design: it relies on implementation internals instead of
documented interfaces.
> because our glibc has been patched. I have to investigate the details as
> Florian brough it to our attention that an error should be reported.
next prev parent reply other threads:[~2023-05-16 8:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20230512142114eucas1p112d969a89ad2480a0c10a532bd6d8440@eucas1p1.samsung.com>
2023-05-12 14:21 ` Lukasz Stelmach
2023-05-12 15:13 ` Florian Weimer
2023-05-15 13:47 ` Palmer Dabbelt
[not found] ` <CGME20230516065316eucas1p17bffcd25209bb441b9a9f4d263aa8b3c@eucas1p1.samsung.com>
2023-05-16 6:53 ` Lukasz Stelmach
2023-05-16 7:59 ` Szabolcs Nagy [this message]
2023-05-17 0:11 ` Palmer Dabbelt
2023-05-12 19:50 ` Fangrui Song
2023-05-12 20:11 ` Florian Weimer
2023-05-12 20:33 ` Palmer Dabbelt
2023-05-12 21:09 ` Fangrui Song
2023-05-12 21:57 ` Palmer Dabbelt
2023-05-12 22:34 ` Fangrui Song
2023-05-12 22:47 ` Palmer Dabbelt
2023-05-13 0:05 ` Fangrui Song
2023-05-13 0:35 ` Palmer Dabbelt
2023-05-16 3:56 ` Fangrui Song
2023-05-16 22:51 ` Palmer Dabbelt
2023-05-16 23:21 ` Palmer Dabbelt
2023-05-12 20:35 ` Jeff Law
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