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authorLennert Buytenhek <buytenh@wantstofly.org>2005-11-07 21:12:07 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-07 21:12:07 +0000
commit06c03cac9487555478c7d80065ebf7818bf6fd06 (patch)
tree1a03ff9ae347f40c11d0e3eee790a1b88ff29cc1 /arch
parent862184fe013146a0d9654a5598c5a2691747541c (diff)
downloadlinux-06c03cac9487555478c7d80065ebf7818bf6fd06.tar.bz2
[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')
-rw-r--r--arch/arm/nwfpe/fpopcode.c16
-rw-r--r--arch/arm/nwfpe/softfloat-specialize1
-rw-r--r--arch/arm/nwfpe/softfloat.c6
-rw-r--r--arch/arm/nwfpe/softfloat.h1
4 files changed, 16 insertions, 8 deletions
diff --git a/arch/arm/nwfpe/fpopcode.c b/arch/arm/nwfpe/fpopcode.c
index 4c9f5703148c..67ff2ab08ea0 100644
--- a/arch/arm/nwfpe/fpopcode.c
+++ b/arch/arm/nwfpe/fpopcode.c
@@ -29,14 +29,14 @@
#ifdef CONFIG_FPE_NWFPE_XP
const floatx80 floatx80Constant[] = {
- {0x0000, 0x0000000000000000ULL}, /* extended 0.0 */
- {0x3fff, 0x8000000000000000ULL}, /* extended 1.0 */
- {0x4000, 0x8000000000000000ULL}, /* extended 2.0 */
- {0x4000, 0xc000000000000000ULL}, /* extended 3.0 */
- {0x4001, 0x8000000000000000ULL}, /* extended 4.0 */
- {0x4001, 0xa000000000000000ULL}, /* extended 5.0 */
- {0x3ffe, 0x8000000000000000ULL}, /* extended 0.5 */
- {0x4002, 0xa000000000000000ULL} /* extended 10.0 */
+ { .high = 0x0000, .low = 0x0000000000000000ULL},/* extended 0.0 */
+ { .high = 0x3fff, .low = 0x8000000000000000ULL},/* extended 1.0 */
+ { .high = 0x4000, .low = 0x8000000000000000ULL},/* extended 2.0 */
+ { .high = 0x4000, .low = 0xc000000000000000ULL},/* extended 3.0 */
+ { .high = 0x4001, .low = 0x8000000000000000ULL},/* extended 4.0 */
+ { .high = 0x4001, .low = 0xa000000000000000ULL},/* extended 5.0 */
+ { .high = 0x3ffe, .low = 0x8000000000000000ULL},/* extended 0.5 */
+ { .high = 0x4002, .low = 0xa000000000000000ULL},/* extended 10.0 */
};
#endif
diff --git a/arch/arm/nwfpe/softfloat-specialize b/arch/arm/nwfpe/softfloat-specialize
index acf409144763..d4a4c8e06635 100644
--- a/arch/arm/nwfpe/softfloat-specialize
+++ b/arch/arm/nwfpe/softfloat-specialize
@@ -332,6 +332,7 @@ static floatx80 commonNaNToFloatx80( commonNaNT a )
z.low = LIT64( 0xC000000000000000 ) | ( a.high>>1 );
z.high = ( ( (bits16) a.sign )<<15 ) | 0x7FFF;
+ z.__padding = 0;
return z;
}
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 ) {
diff --git a/arch/arm/nwfpe/softfloat.h b/arch/arm/nwfpe/softfloat.h
index 14151700b6b2..1301d97e037f 100644
--- a/arch/arm/nwfpe/softfloat.h
+++ b/arch/arm/nwfpe/softfloat.h
@@ -55,6 +55,7 @@ typedef unsigned long int float32;
typedef unsigned long long float64;
typedef struct {
unsigned short high;
+ unsigned short __padding;
unsigned long long low;
} floatx80;