From: Carlos O'Donell <carlos@redhat.com>
To: Florian Weimer <fweimer@redhat.com>, libc-alpha@sourceware.org
Subject: Re: [PATCH] elf: Fix dlclose of an empty namespace in auditing mode (bug 26076)
Date: Wed, 3 Jun 2020 16:28:54 -0400 [thread overview]
Message-ID: <5d08b5e0-c96a-0c97-304f-8509f7b0f322@redhat.com> (raw)
In-Reply-To: <87zh9kuuw1.fsf@oldenburg2.str.redhat.com>
On 6/3/20 9:43 AM, Florian Weimer via Libc-alpha wrote:
> ns->_ns_loaded is NULL if nothing has been loaded into the namespace.
>
> It seems difficult to hit this bug reliably, so this change does not
> come with a test case. It was trigger by accident, due to TLS
> exhaustion.
I think this should fail catastrophically and quickly.
> ---
> elf/dl-close.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/elf/dl-close.c b/elf/dl-close.c
> index 73b2817bbf..896e59e42e 100644
> --- a/elf/dl-close.c
> +++ b/elf/dl-close.c
> @@ -782,7 +782,7 @@ _dl_close_worker (struct link_map *map, bool force)
> {
> struct link_map *head = ns->_ns_loaded;
> /* Do not call the functions for any auditing object. */
> - if (head->l_auditing == 0)
> + if (head != NULL && head->l_auditing == 0)
> {
> struct audit_ifaces *afct = GLRO(dl_audit);
> for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
>
Use _dl_signal_error to indicate an internal error?
--
Cheers,
Carlos.
next prev parent reply other threads:[~2020-06-03 20:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-03 13:43 Florian Weimer
2020-06-03 20:28 ` Carlos O'Donell [this message]
2020-06-03 21:00 ` Florian Weimer
2020-06-03 22:06 ` Carlos O'Donell
2020-06-04 12:57 ` Florian Weimer
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