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/*
* Routines to get randomness.
*/
#include <syslog.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <limits.h>
#include "arch.h"
#include "pids.h"
#include "random.h"
#include "sanitise.h" // interesting_numbers
#include "types.h"
#include "utils.h"
int rnd(void)
{
return rand();
}
/*
* OR a random number of bits into a mask.
* Used by ARG_LIST generation, and get_o_flags()
*/
unsigned long set_rand_bitmask(unsigned int num, const unsigned long *values)
{
unsigned long i;
unsigned long mask = 0;
unsigned int bits;
bits = RAND_RANGE(0, num); /* num of bits to OR */
if (bits == 0)
return mask;
for (i = 0; i < bits; i++)
mask |= values[rnd() % num];
return mask;
}
/*
* Pick a random power of two between 2^0 and 2^(WORD_BIT-1)
*/
unsigned long rand_single_bit(unsigned char size)
{
if (size > WORD_BIT)
size = WORD_BIT;
return (1UL << (rnd() % size));
}
/*
* set N bits, where N= rand(0 - WORDSIZE/2)
*/
static unsigned long randbits(int limit)
{
unsigned int num = rnd() % (limit / 2);
unsigned int i;
unsigned long r = 0;
for (i = 0; i < num; i++)
r |= (1UL << (rnd() % (limit - 1)));
return r;
}
/*
* Pick 1 random byte, and repeat it through a long.
*/
static unsigned long rept_byte(void)
{
unsigned long r = RAND_BYTE();
r = (r << 8) | r;
r = (r << 16) | r;
#if WORD_BIT == 64
r = (r << 32) | r;
#endif
return r;
}
/*
* Generate, and munge a 16bit number.
*/
unsigned short rand16(void)
{
unsigned short r = 0, r2;
switch (rnd() % 6) {
case 0: r = RAND_BYTE();
break;
case 1: r = rand_single_bit(16);
break;
case 2: r = randbits(16);
break;
case 3: r = rnd();
break;
case 4: r2 = rnd() & 0xff;
r = r2 | r2 << 8;
break;
case 5: return 0 - ((rnd() % 10) + 1);
}
/* Sometimes flip sign */
if (ONE_IN(25))
r = ~r + 1;
if (ONE_IN(25)) {
int _div = 1 << RAND_RANGE(1, 4); /* 2,4,8 or 16 */
r /= _div;
}
if (RAND_BOOL()) {
/* limit the size */
switch (rnd() % 3) {
case 0: r &= 0xff;
break;
case 1: r &= 0xfff;
break;
case 2: r &= PAGE_MASK;
break;
}
}
return r;
}
/*
* Generate, and munge a 32bit number.
*/
unsigned int rand32(void)
{
unsigned long r = 0;
switch (rnd() % 8) {
case 0: r = RAND_BYTE();
break;
case 1: r = rand16();
break;
case 2: r = rand_single_bit(32);
break;
case 3: r = randbits(32);
break;
case 4: r = rnd();
break;
case 5: r = rept_byte();
break;
case 6: return get_interesting_value();
case 7: return 0 - ((rnd() % 10) + 1);
}
/* Sometimes deduct it from INT_MAX */
if (ONE_IN(25))
r = INT_MAX - r;
/* Sometimes flip sign */
if (ONE_IN(25))
r = ~r + 1;
/* we might get lucky if something is counting ints/longs etc. */
if (ONE_IN(25)) {
int _div = 1 << RAND_RANGE(1, 4); /* 2,4,8 or 16 */
r /= _div;
}
if (RAND_BOOL()) {
/* limit the size */
switch (rnd() % 4) {
case 0: r &= 0xff;
break;
case 1: r &= 0xffff;
break;
case 2: r &= PAGE_MASK;
break;
case 3: r &= 0xffffff;
break;
}
}
return r;
}
/*
* Generate and munge a 64bit number.
*/
u64 rand64(void)
{
u64 r = 0;
switch (rnd() % 9) {
/* 8-bit ranges */
case 0: r = RAND_BYTE();
break;
/* 16-bit ranges */
case 1: r = rand16();
break;
/* 32-bit ranges. */
case 2: r = rand32();
break;
/* 33:64-bit ranges. */
case 3: r = rand_single_bit(64);
break;
case 4: r = randbits(64);
break;
case 5: r = (u64) rnd() << 32 | rnd();
break;
case 6: r = rept_byte();
break;
/* Sometimes pick a not-so-random number. */
case 7: return get_interesting_value();
// small 64bit negative number.
case 8: return 0 - ((rnd() % 10) + 1);
}
/* limit the size */
switch (rnd() % 4) {
case 0: r &= 0x000000ffffffffffULL;
break;
case 1: r &= 0x0000ffffffffffffULL;
break;
case 2: r &= 0x00ffffffffffffffULL;
break;
default: /* no limiting. */
break;
}
/* Sometimes invert the generated number. */
if (ONE_IN(25))
r = ~r;
/* increase distribution in MSB */
if (ONE_IN(10)) {
unsigned int i;
unsigned int rounds;
rounds = rnd() % 4;
for (i = 0; i < rounds; i++)
r |= (1UL << ((WORD_BIT - 1) - (rnd() % 8)));
}
/* Sometimes flip sign */
if (ONE_IN(25))
r = ~r + 1;
return r;
}
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