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#define TST_NO_DEFAULT_MAIN
#include "tst_test.h"
#include "tst_taint.h"
#include "tst_safe_stdio.h"
#define TAINT_FILE "/proc/sys/kernel/tainted"
static unsigned int taint_mask = -1;
static unsigned int tst_taint_read(void)
{
unsigned int val;
SAFE_FILE_SCANF(TAINT_FILE, "%u", &val);
return val;
}
static int tst_taint_check_kver(unsigned int mask)
{
int r1;
int r2;
int r3 = 0;
if (mask & TST_TAINT_X) {
r1 = 4;
r2 = 15;
} else if (mask & TST_TAINT_K) {
r1 = 4;
r2 = 0;
} else if (mask & TST_TAINT_L) {
r1 = 3;
r2 = 17;
} else if (mask & TST_TAINT_E) {
r1 = 3;
r2 = 15;
} else if (mask & TST_TAINT_O) {
r1 = 3;
r2 = 2;
} else if (mask & TST_TAINT_I) {
r1 = 2;
r2 = 6;
r3 = 35;
} else if (mask & TST_TAINT_C) {
r1 = 2;
r2 = 6;
r3 = 28;
} else if (mask & TST_TAINT_W) {
r1 = 2;
r2 = 6;
r3 = 26;
} else if (mask & TST_TAINT_A) {
r1 = 2;
r2 = 6;
r3 = 25;
} else if (mask & TST_TAINT_D) {
r1 = 2;
r2 = 6;
r3 = 23;
} else if (mask & TST_TAINT_U) {
r1 = 2;
r2 = 6;
r3 = 21;
} else {
r1 = 2;
r2 = 6;
r3 = 16;
}
return tst_kvercmp(r1, r2, r3);
}
void tst_taint_init(unsigned int mask)
{
unsigned int taint = -1;
if (mask == 0)
tst_brk(TBROK, "mask is not allowed to be 0");
if (tst_taint_check_kver(mask) < 0)
tst_res(TCONF, "Kernel is too old for requested mask");
taint_mask = mask;
taint = tst_taint_read();
if (taint & TST_TAINT_W) {
tst_res(TCONF, "Ignoring already set kernel warning taint");
taint_mask &= ~TST_TAINT_W;
}
if ((taint & taint_mask) != 0)
tst_brk(TBROK, "Kernel is already tainted: %u", taint);
}
unsigned int tst_taint_check(void)
{
unsigned int taint = -1;
if (taint_mask == (unsigned int) -1)
tst_brk(TBROK, "need to call tst_taint_init() first");
taint = tst_taint_read();
return (taint & taint_mask);
}
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