| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 116/238] ARM: 8165/1: alignment: dont break misaligned NEON load/store | Date | Fri, 3 Oct 2014 14:30:31 -0700 |
| |
3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Robin Murphy <robin.murphy@arm.com>
commit 5ca918e5e3f9df4634077c06585c42bc6a8d699a upstream.
The alignment fixup incorrectly decodes faulting ARM VLDn/VSTn instructions (where the optional alignment hint is given but incorrect) as LDR/STR, leading to register corruption. Detect these and correctly treat them as unhandled, so that userspace gets the fault it expects.
Reported-by: Simon Hosie <simon.hosie@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm/mm/alignment.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/arch/arm/mm/alignment.c +++ b/arch/arm/mm/alignment.c @@ -40,6 +40,7 @@ * This code is not portable to processors with late data abort handling. */ #define CODING_BITS(i) (i & 0x0e000000) +#define COND_BITS(i) (i & 0xf0000000) #define LDST_I_BIT(i) (i & (1 << 26)) /* Immediate constant */ #define LDST_P_BIT(i) (i & (1 << 24)) /* Preindex */ @@ -817,6 +818,8 @@ do_alignment(unsigned long addr, unsigne break; case 0x04000000: /* ldr or str immediate */ + if (COND_BITS(instr) == 0xf0000000) /* NEON VLDn, VSTn */ + goto bad; offset.un = OFFSET_BITS(instr); handler = do_alignment_ldrstr; break;
|