From: Siddhesh Poyarekar <siddhesh@sourceware.org>
To: Florian Weimer <fweimer@redhat.com>
Cc: libc-alpha@sourceware.org, schwab@suse.de, carlos@redhat.com
Subject: Re: [PATCH v3] getaddrinfo: Fix use after free in getcanonname (CVE-2023-4806)
Date: Thu, 14 Sep 2023 07:27:12 -0400 [thread overview]
Message-ID: <77a393e5-34e1-09b3-1fa0-e52387664e0a@sourceware.org> (raw)
In-Reply-To: <87il8d2fhq.fsf@oldenburg3.str.redhat.com>
On 2023-09-14 06:53, Florian Weimer wrote:
>> @@ -262,7 +272,6 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, int family,
>> }
>> array[i].next = array + i + 1;
>> }
>> - array[0].name = h->h_name;
>> array[count - 1].next = NULL;
>
> I would expect
>
> array[0].name = res->h_name;
>
> here, but that's not needed because the assignment happens in
> generate_addrinfo, from res->canon, which may have been set with
> res->h_name as a fallback?
Right, we basically only use res->at->name in the gethostbyname4_r path
as a transitory value (it finally gets duplicated into res->canon)
because unfortunately we've encoded that into the NSS API :/
Thanks,
Sid
next prev parent reply other threads:[~2023-09-14 11:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-13 17:36 [PATCH] " Siddhesh Poyarekar
2023-09-13 19:03 ` Florian Weimer
2023-09-13 20:56 ` [PATCH v2] " Siddhesh Poyarekar
2023-09-14 8:37 ` Andreas Schwab
2023-09-14 9:48 ` Siddhesh Poyarekar
2023-09-14 9:55 ` Andreas Schwab
2023-09-14 9:57 ` Siddhesh Poyarekar
2023-09-14 10:00 ` Andreas Schwab
2023-09-14 10:06 ` Siddhesh Poyarekar
2023-09-14 10:12 ` Andreas Schwab
2023-09-14 10:24 ` Siddhesh Poyarekar
2023-09-14 10:13 ` [PATCH v3] " Siddhesh Poyarekar
2023-09-14 10:53 ` Florian Weimer
2023-09-14 11:27 ` Siddhesh Poyarekar [this message]
2023-09-14 22:52 ` Carlos O'Donell
2023-09-15 18:41 ` [COMMITTED] " Siddhesh Poyarekar
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