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Assigning memory size dynamically causes stack smashing error


Assigning memory size dynamically causes stack smashing error

By : akhil thakur
Date : November 21 2020, 04:01 AM
it should still fix some issue The situation is rather simple, but I have no clue why I am overflowing the buffer. I am trying to print out the contents of a file. Assigning a static int to the count works, but any method of finding out the file's size causes this error to appear and the program to exit. , In your code
code :
char path[] = "upload/";
strcat(path, filename);


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Keep getting stack smashing error

Keep getting stack smashing error


By : bokingwen
Date : March 29 2020, 07:55 AM
wish of those help I have an buffer of size 101 , Alignment issues aside,
code :
 for(i=0;i<sizeof(buffer);i+=4)
     *(long*)&buffer[i] = address
Assigning memory dynamically or on the stack based on a condition (if statement)

Assigning memory dynamically or on the stack based on a condition (if statement)


By : karunakar reddy
Date : March 29 2020, 07:55 AM
wish of those help The declaration of average has a limited lifetime in your code; it lives up to the end of the block. In other words, the way you declare average makes it available only inside the if/else block.
I suggest splitting this up in two functions: one handles the allocation; the other does the work. Something like this:
code :
void do_average(int size, int threshold) {
    if (size < threshold) {
         float avg[size];
         average(size, avg);
    } else {
         float *avg = malloc(sizeof(*avg)*size);
         assert(avg != NULL);
         average(size, avg);
         free(avg);
    }
} 

void average(int avg_size, float avg[static avg_size]) {
    /* Do some stuff with avg */
}
Dynamically allocating memory when the size is currently unknown but the stack can't hold

Dynamically allocating memory when the size is currently unknown but the stack can't hold


By : AA12343BE
Date : March 29 2020, 07:55 AM
hop of those help? All STL containers using an allocator (that are all except std::array and its derivates) store their items in dynamically allocated memory (usually implemented as heap).
Raw pointers are generally bad in C++ because they break RAII idiom and therefore are susceptible to memory leaks.
Why am I not getting stack smashing error when I access memory beyond what I allocated?

Why am I not getting stack smashing error when I access memory beyond what I allocated?


By : purva wankhedkar
Date : March 29 2020, 07:55 AM
wish helps you Most C implementations won't bother to protect the stack or heap from being overwritten by a few bytes only. (There's a library aptly named Electric Fence that can do so). Chances are, if you write enough data, you'll eventually write beyond the allowed address space and the program crashes in one way or another (this depends on many factors, like OS, compiler, options). As you noticed by now, this answer is very vague. The reason is that what you do is technically called undefined behavior by the C Standard, which means the implementation is free to do anything, including nothing.
Why is it so? Why doesn't the C Standard have a clause saying
Stack Guard and Stack Smashing Protection - canaries, memory

Stack Guard and Stack Smashing Protection - canaries, memory


By : WERNER Hofmann
Date : March 29 2020, 07:55 AM
seems to work fine Stack Smashing Protection (SSP) is an improvement over StackGuard. SSP was first implemented in gcc 4.1.
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