[RESEND-2][PATCH][BZ 13761] Fix allocation in nss_compat for large number of memberships to a group

[Siddhesh Poyarekar]

Hi,

Resending once again:

nss_compat allocates buffer space on stack using alloca (and
extend_alloca) for initgroup and keeps extending it to fit in larger
lines. This breaks for cases where the number of members in a gorup
are very large, causing the alloca reference to go beyond thread stack
boundary. Attached patch falls back to malloc/free if the buffer size
needed is beyond __libc_alloca_cutoff.

Regards,
Siddhesh


ChangeLog:

2012-02-09  Siddhesh Poyarekar  <siddhesh@redhat.com>

	* nis/nss_compat/compat-initgroups.c (getgrent_next_nss,
	_nss_compat_initgroups_dyn): Fall back to malloc/free for
	large group memberships.


Date: Wed, 14 Mar 2012 18:35:43 +0530
From: Siddhesh Poyarekar <siddhesh@redhat.com>
To: libc-alpha@sourceware.org
Cc: Carlos O'Donell <carlos@systemhalted.org>, Jeff Law <law@redhat.com>
Subject: [RESEND][PATCH][BZ 13761] Fix allocation in nss_compat for
large number of memberships to a group


ping.

--
Siddhesh
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Subject: [PATCH][BZ 13761] Fix allocation in nss_compat for large number of memberships to a group
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