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authorLennert Buytenhek <buytenh@wantstofly.org>2005-11-08 00:12:07 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-08 00:12:07 +0300
commit06c03cac9487555478c7d80065ebf7818bf6fd06 (patch)
tree1a03ff9ae347f40c11d0e3eee790a1b88ff29cc1 /arch/arm/nwfpe/softfloat.c
parent862184fe013146a0d9654a5598c5a2691747541c (diff)
downloadlinux-06c03cac9487555478c7d80065ebf7818bf6fd06.tar.xz
[ARM] 3117/1: nwfpe kernel memory info leak
Patch from Lennert Buytenhek The routine that nwfpe uses for converting floats/doubles to extended precision fails to zero two bytes of kernel stack. This is not immediately obvious, as the floatx80 structure has 16 bits of implicit padding (by design.) These two bytes are copied to userspace when an stfe is emulated, causing a possible info leak. Make the padding explicit and zero it out in the relevant places. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/nwfpe/softfloat.c')
-rw-r--r--arch/arm/nwfpe/softfloat.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/softfloat.c b/arch/arm/nwfpe/softfloat.c
index f9f049132a17..0f9656e482ba 100644
--- a/arch/arm/nwfpe/softfloat.c
+++ b/arch/arm/nwfpe/softfloat.c
@@ -531,6 +531,7 @@ INLINE floatx80 packFloatx80( flag zSign, int32 zExp, bits64 zSig )
z.low = zSig;
z.high = ( ( (bits16) zSign )<<15 ) + zExp;
+ z.__padding = 0;
return z;
}
@@ -2831,6 +2832,7 @@ static floatx80 subFloatx80Sigs( struct roundingData *roundData, floatx80 a, flo
roundData->exception |= float_flag_invalid;
z.low = floatx80_default_nan_low;
z.high = floatx80_default_nan_high;
+ z.__padding = 0;
return z;
}
if ( aExp == 0 ) {
@@ -2950,6 +2952,7 @@ floatx80 floatx80_mul( struct roundingData *roundData, floatx80 a, floatx80 b )
roundData->exception |= float_flag_invalid;
z.low = floatx80_default_nan_low;
z.high = floatx80_default_nan_high;
+ z.__padding = 0;
return z;
}
return packFloatx80( zSign, 0x7FFF, LIT64( 0x8000000000000000 ) );
@@ -3015,6 +3018,7 @@ floatx80 floatx80_div( struct roundingData *roundData, floatx80 a, floatx80 b )
roundData->exception |= float_flag_invalid;
z.low = floatx80_default_nan_low;
z.high = floatx80_default_nan_high;
+ z.__padding = 0;
return z;
}
roundData->exception |= float_flag_divbyzero;
@@ -3093,6 +3097,7 @@ floatx80 floatx80_rem( struct roundingData *roundData, floatx80 a, floatx80 b )
roundData->exception |= float_flag_invalid;
z.low = floatx80_default_nan_low;
z.high = floatx80_default_nan_high;
+ z.__padding = 0;
return z;
}
normalizeFloatx80Subnormal( bSig, &bExp, &bSig );
@@ -3184,6 +3189,7 @@ floatx80 floatx80_sqrt( struct roundingData *roundData, floatx80 a )
roundData->exception |= float_flag_invalid;
z.low = floatx80_default_nan_low;
z.high = floatx80_default_nan_high;
+ z.__padding = 0;
return z;
}
if ( aExp == 0 ) {