[ARM] fix VFP+softfloat binaries

2.6.28-rc tightened up the ELF architecture checks on ARM.  For
non-EABI it only allows VFP if the hardware supports it.  However,
the kernel fails to also inspect the soft-float flag, so it
incorrectly rejects binaries using soft-VFP.

The fix is simple: also check that EF_ARM_SOFT_FLOAT isn't set
before rejecting VFP binaries on non-VFP hardware.

Acked-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/arm/kernel/elf.c b/arch/arm/kernel/elf.c
index 513f332f040d..84849098c8e8 100644
--- a/arch/arm/kernel/elf.c
+++ b/arch/arm/kernel/elf.c
@@ -21,12 +21,16 @@ int elf_check_arch(const struct elf32_hdr *x)
 
         eflags = x->e_flags;
         if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) {
+                unsigned int flt_fmt;
+
                 /* APCS26 is only allowed if the CPU supports it */
                 if ((eflags & EF_ARM_APCS_26) && !(elf_hwcap & HWCAP_26BIT))
                         return 0;
 
+                flt_fmt = eflags & (EF_ARM_VFP_FLOAT | EF_ARM_SOFT_FLOAT);
+
                 /* VFP requires the supporting code */
-                if ((eflags & EF_ARM_VFP_FLOAT) && !(elf_hwcap & HWCAP_VFP))
+                if (flt_fmt == EF_ARM_VFP_FLOAT && !(elf_hwcap & HWCAP_VFP))
                         return 0;
         }
         return 1;