From: Daniel Hellstrom <daniel@gaisler.com>
Date: Tue, 1 Feb 2011 20:39:59 +0000 (-0800)
Subject: sparc32: unaligned memory access (MNA) trap handler bug
X-Git-Tag: v2.6.38-rc6~27^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2492218c63dca0fb4f041bdc366d243ae3426b40;p=pandora-kernel.git

sparc32: unaligned memory access (MNA) trap handler bug

Since commit f0e98c387e61de00646be31fab4c2fa0224e1efb ("[SPARC]: Fix
link errors with gcc-4.3") the MNA trap handler does not emulate
stores to unaligned addresses correctly. MNA operation from both
kernel and user space are affected.

A typical effect of this bug is nr_frags in skbs are overwritten
during buffer copying/checksum-calculation, or maximally 6 bytes
of data in the network buffer will be overwitten with garbage.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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