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powerpc: Fix string instr. emulation for 32-bit processes on ppc64 

String instruction emulation would erroneously result in a segfault if
the upper bits of the EA are set and is so high that it fails access
check.  Truncate the EA to 32 bits if the process is 32-bit.

Signed-off-by: James Yang <James.Yang@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
James Yang 2013-06-25 11:41:05 -05:00 committed by Benjamin Herrenschmidt
parent e1b85c17bf
commit 80aa0fb494
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/traps.c
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@ -866,6 +866,10 @@ static int emulate_string_inst(struct pt_regs *regs, u32 instword)
u8 val;
u32 shift = 8 * (3 - (pos & 0x3));
/* if process is 32-bit, clear upper 32 bits of EA */
if ((regs->msr & MSR_64BIT) == 0)
EA &= 0xFFFFFFFF;
switch ((instword & PPC_INST_STRING_MASK)) {
case PPC_INST_LSWX:
case PPC_INST_LSWI: