[CRASH] I am getting a segmentation fault calling my primitive

 
Hey y'all,

I am getting a segmentation fault calling primitiveGaloisMultiplyBy in
my RSErasurePlugin. I have attached the crash.dmp file.
Investigating...assistance requested. Grazie!!

--
---
Kindly,
Robert

 

Here is the RSErasurePlugin.so & RSFECPlugin.so so folks may be able to help me test the seg-fault with these plugin and loading the latest RSErasure code:

Installer ss
    project: 'Cryptography';
    install: 'ProCrypto-1-1-1';
    install: 'ProCryptoTests-1-1-1'.

Here is the code I run that leads to the seg-fault:

RSErasureGalois newGalois.

Hey y'all,

I am getting a segmentation fault calling primitiveGaloisMultiplyBy in
my RSErasurePlugin. I have attached the crash.dmp file.
Investigating...assistance requested. Grazie!!

--
---
Kindly,
Robert

 

Could the issue be bounds checking in the primitive? But it is a seg-fault, not a #primitiveFailed. Thanks for any and all help! This one has me stumped.

    ((interpreterProxy isBytes: a)
        and: [ (interpreterProxy stSizeOf: a) = 4 ])
        ifFalse: [ ^interpreterProxy primitiveFailFor: PrimErrBadArgument ].
    ((interpreterProxy isBytes: b)
        and: [ (interpreterProxy stSizeOf: b) = 4 ])
        ifFalse: [ ^interpreterProxy primitiveFailFor: PrimErrBadArgument ].

Here is the RSErasurePlugin.so & RSFECPlugin.so so folks may be able to help me test the seg-fault with these plugin and loading the latest RSErasure code:

Installer ss
    project: 'Cryptography';
    install: 'ProCrypto-1-1-1';
    install: 'ProCryptoTests-1-1-1'.

Here is the code I run that leads to the seg-fault:

RSErasureGalois newGalois.

---
Kindly,
Robert

On 5/29/21 2:37 PM, Robert Withers wrote:

Hey y'all,

I am getting a segmentation fault calling primitiveGaloisMultiplyBy in
my RSErasurePlugin. I have attached the crash.dmp file.
Investigating...assistance requested. Grazie!!

--
---
Kindly,
Robert

 

I commented out these argument checks and regenerated and rebuilt the plugins. New plugins are attached.

Now the RSErasureGaloisWithPlugin is working, for the following squeak calls.

RSErasureGalois newGalois... a RSErasureGaloisWithPlugin

self addOrSubtract: 2 by: 1. = 3
self divide: 4 by: 2. = 14
self exp: 3. = 8
self exp: 2 power: 2. = 4
self log: 4. = 2
self galoisMultiply: 2 by: 2. = 4
self tableMultiply: 2 by: 2. = 4

I still have problems with the RSFECPlugin, calling methods in RSFECGenericGFWithPlugin:

RSFECGenericGF newPrimitive: 16r012D size: 256 generatorBase: 1... a RSFECGenericGFWithPlugin

self addOrSubtract: 2 by: 1. = 3
self exp: 3. {#primitiveFailed}
self inverse: 2. = 0
self log: 4. {#primitiveFailed}
self multiply: 2 by: 2. {#primitiveFailed}

Could the issue be bounds checking in the primitive? But it is a seg-fault, not a #primitiveFailed. Thanks for any and all help! This one has me stumped.

    ((interpreterProxy isBytes: a)
        and: [ (interpreterProxy stSizeOf: a) = 4 ])
        ifFalse: [ ^interpreterProxy primitiveFailFor: PrimErrBadArgument ].
    ((interpreterProxy isBytes: b)
        and: [ (interpreterProxy stSizeOf: b) = 4 ])
        ifFalse: [ ^interpreterProxy primitiveFailFor: PrimErrBadArgument ].

---
Kindly,
Robert

On 5/29/21 2:42 PM, Robert Withers wrote:

Here is the RSErasurePlugin.so & RSFECPlugin.so so folks may be able to help me test the seg-fault with these plugin and loading the latest RSErasure code:

Installer ss
    project: 'Cryptography';
    install: 'ProCrypto-1-1-1';
    install: 'ProCryptoTests-1-1-1'.

Here is the code I run that leads to the seg-fault:

RSErasureGalois newGalois.

---
Kindly,
Robert

On 5/29/21 2:37 PM, Robert Withers wrote:

Hey y'all,

I am getting a segmentation fault calling primitiveGaloisMultiplyBy in
my RSErasurePlugin. I have attached the crash.dmp file.
Investigating...assistance requested. Grazie!!

--
---
Kindly,
Robert

 

I have an issue with:

RSErasureGalois newGalois divide: 4 by: 2.

In the image I get 2. In the plugin I get 142, which is the value for index 255 in the expTable. My question is how can I printf to stdout, inside the plugin code. I tried adding some debug lines to the c code:

    printf( "a: %i\n", a );
    printf( "b: %i\n", b );
    logA = logTable[a];
    logB = logTable[b];
    printf( "logA: %i\n", logA );
    printf( "logB: %i\n", logB );
    logResult = logA - logB;
    while (logResult <= 0) {
        logResult += 0xFF;
    }
    if (logResult == 0) {
        return 1;
    }
    printf( "logResult: %i\n", logResult );
    result = expTable[logResult];
    printf( "result: %i\n", result );

This did not work, however. How can I debug the c code?

I commented out these argument checks and regenerated and rebuilt the plugins. New plugins are attached.

Now the RSErasureGaloisWithPlugin is working, for the following squeak calls.

RSErasureGalois newGalois... a RSErasureGaloisWithPlugin

self addOrSubtract: 2 by: 1. = 3
self divide: 4 by: 2. = 14
self exp: 3. = 8
self exp: 2 power: 2. = 4
self log: 4. = 2
self galoisMultiply: 2 by: 2. = 4
self tableMultiply: 2 by: 2. = 4

I still have problems with the RSFECPlugin, calling methods in RSFECGenericGFWithPlugin:

RSFECGenericGF newPrimitive: 16r012D size: 256 generatorBase: 1... a RSFECGenericGFWithPlugin

self addOrSubtract: 2 by: 1. = 3
self exp: 3. {#primitiveFailed}
self inverse: 2. = 0
self log: 4. {#primitiveFailed}
self multiply: 2 by: 2. {#primitiveFailed}

---
Kindly,
Robert

On 5/29/21 2:49 PM, Robert Withers wrote:

Could the issue be bounds checking in the primitive? But it is a seg-fault, not a #primitiveFailed. Thanks for any and all help! This one has me stumped.

    ((interpreterProxy isBytes: a)
        and: [ (interpreterProxy stSizeOf: a) = 4 ])
        ifFalse: [ ^interpreterProxy primitiveFailFor: PrimErrBadArgument ].
    ((interpreterProxy isBytes: b)
        and: [ (interpreterProxy stSizeOf: b) = 4 ])
        ifFalse: [ ^interpreterProxy primitiveFailFor: PrimErrBadArgument ].

---
Kindly,
Robert

On 5/29/21 2:42 PM, Robert Withers wrote:

Here is the RSErasurePlugin.so & RSFECPlugin.so so folks may be able to help me test the seg-fault with these plugin and loading the latest RSErasure code:

Installer ss
    project: 'Cryptography';
    install: 'ProCrypto-1-1-1';
    install: 'ProCryptoTests-1-1-1'.

Here is the code I run that leads to the seg-fault:

RSErasureGalois newGalois.

---
Kindly,
Robert

On 5/29/21 2:37 PM, Robert Withers wrote:

Hey y'all,

I am getting a segmentation fault calling primitiveGaloisMultiplyBy in
my RSErasurePlugin. I have attached the crash.dmp file.
Investigating...assistance requested. Grazie!!

--
---
Kindly,
Robert