| Submitter | James Yang |
|---|---|
| Date | June 25, 2013, 4:41 p.m. |
| Message ID | <alpine.LRH.2.00.1306251133460.1506@ra8135-ec1.am.freescale.net> |
| Download | mbox | patch |
| Permalink | /patch/254424/ |
| State | Accepted |
| Commit | 80aa0fb4940bf8ee52bcb574d74459a7aea45621 |
| Headers | show |
Comments
Patch
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index dce1bea..c72e7e9 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -840,6 +840,10 @@ 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:
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> --- arch/powerpc/kernel/traps.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)