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| author | Robin Murphy <robin.murphy@arm.com> | 2014-09-25 11:56:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-10-05 14:54:10 -0700 |
| commit | fc7e5dd63936d19bbe2bb002780c06dc1cdd20a1 (patch) | |
| tree | 9df11abb9009e2df2f88c8906fa999a1cb5ba7df /arch | |
| parent | 9b21d37838fca95c85b10abf48f3059236ad5d6c (diff) | |
| download | linux-3.10-fc7e5dd63936d19bbe2bb002780c06dc1cdd20a1.tar.gz linux-3.10-fc7e5dd63936d19bbe2bb002780c06dc1cdd20a1.tar.bz2 linux-3.10-fc7e5dd63936d19bbe2bb002780c06dc1cdd20a1.zip | |
ARM: 8165/1: alignment: don't break misaligned NEON load/store
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/alignment.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c index 6f4585b8907..1fe0bf5c737 100644 --- a/arch/arm/mm/alignment.c +++ b/arch/arm/mm/alignment.c @@ -39,6 +39,7 @@ * 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 */ @@ -812,6 +813,8 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs) 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; |