Commit 2492218c authored Feb 01, 2011 by Daniel Hellstrom Committed by David S. Miller Feb 01, 2011

sparc32: unaligned memory access (MNA) trap handler bug



Since commit f0e98c38 ("[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>

parent 5edddaab

arch/sparc/kernel/una_asm_32.S

+2 −2

Original line number	Diff line number	Diff line
		@@ -24,9 +24,9 @@ retl_efault:
		.globl __do_int_store
		__do_int_store:
		ld [%o2], %g1
		cmp %1, 2
		cmp %o1, 2
		be 2f
		cmp %1, 4
		cmp %o1, 4
		be 1f
		srl %g1, 24, %g2
		srl %g1, 16, %g7