How to compile the iOS app for I want to fuzz iOS ImageIO?

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youyu...@gmail.com

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Oct 13, 2016, 3:00:04 AM10/13/16

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Hello,

I want to fuzz iOS ImageIO, but when I build the app with afl-clang, it occures many errors.

The test harness was written like below, it is an main.m file which create in Xcode:

#import <ImageIO/ImageIO.h>

#import "AppDelegate.h"

int main(int argc, char * argv[]) {

@autoreleasepool {

NSFileHandle *stdin = [NSFileHandle fileHandleWithStandardInput];

NSData *data = [stdin readDataToEndOfFile];

CFDataRef dataRef = (__bridge CFDataRef)data;

CGImageSourceRef source = CGImageSourceCreateWithData(dataRef, nil);

CGImageRef cgImage = CGImageSourceCreateImageAtIndex(source, 0, nil);

size_t width = CGImageGetWidth(cgImage);

size_t height = CGImageGetHeight(cgImage);

CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(cgImage) & kCGBitmapAlphaInfoMask;

BOOL hasAlpha = NO;

if (alphaInfo == kCGImageAlphaPremultipliedLast ||

alphaInfo == kCGImageAlphaPremultipliedFirst ||

alphaInfo == kCGImageAlphaLast ||

alphaInfo == kCGImageAlphaFirst) {

hasAlpha = YES;

}

CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Host;

bitmapInfo |= hasAlpha ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst;

CGContextRef context = CGBitmapContextCreate(NULL, width, height, 8, 0, CGColorSpaceCreateDeviceRGB(), bitmapInfo);

CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage);

CGImageRef newImage = CGBitmapContextCreateImage(context);

return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

}

And the compile instructions are as follows:

./afl-clang -fobjc-abi-version=2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.0.sdk -o mainnnn /Users/lilang_wu/Documents/IOS/ios_fuzz/test11.m -framework Foundation -framework UIKit -framework ImageIO

However, the compile results contain many errors:

/var/folders/yv/9dh3cw_976s13hk5t90cyjrw0000gn/T//.afl-78821-1476262885.s:2:2: warning: .ios_version_min should only be used for ios targets

.ios_version_min 10, 0

Undefined symbols for architecture x86_64:

"_CGBitmapContextCreate", referenced from: