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| CodeSonar® 27.0w | AdaCore Inc |
A function to generate a random number is called without first calling the function to set its seed.
See also:
| Class Name | Default Seed in PRNG | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mnemonic | MISC.CRYPTO.SEED | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Categories |
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| Availability | Available for C and C++. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Enabling | Checks for this warning class are
disabled by default. To enable them, add the following WARNING_FILTER
rule to the project configuration file.
WARNING_FILTER += allow class="Default Seed in PRNG" |
Japanese (ja)
#include <stdlib.h>
unsigned int get_high_entropy_seed(void);
long generate_randomness(void) {
long result;
result = random(); /* 'Default Seed in PRNG' warning issued here */
srandom(get_high_entropy_seed());
result += random(); /* ok: seed set on previous line */
return result;
}
int main(int argc, char *argv[]) {
long r = generate_randomness();
return r > 0;
}
To reproduce this example, analyze it with the following configuration:
WARNING_FILTER += allow class="Default Seed in PRNG"
The following configuration file parameters affect checks for this warning class.
To report problems with this documentation, please visit https://support.adacore.com/csm.