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Fix Use of expired stack-address #4593

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Fix Use of expired stack-address #4593

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30 changes: 17 additions & 13 deletions contrib/linux-kernel/test/test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -180,33 +180,37 @@ static void test_f2fs(void) {
fprintf(stderr, "Ok\n");
}

static char *g_stack = NULL;
typedef struct {
char *buf;
size_t size;
} stack_info_t;

static stack_info_t g_stack = { NULL, 0 };

static void __attribute__((noinline)) use(void *x) {
asm volatile("" : "+r"(x));
}

static void __attribute__((noinline)) fill_stack(void) {
memset(g_stack, 0x33, 8192);
char buf[8192];
memset(buf, 0x33, sizeof(buf));
g_stack.buf = buf;
g_stack.size = sizeof(buf);
use(g_stack.buf);
g_stack.buf = NULL;
}

static void __attribute__((noinline)) set_stack(void) {

char stack[8192];
g_stack = stack;
use(g_stack);
g_stack.size = sizeof(stack);
use(stack);
}

static void __attribute__((noinline)) check_stack(void) {
size_t cleanStack = 0;
while (cleanStack < 8192 && g_stack[cleanStack] == 0x33) {
++cleanStack;
}
{
size_t const stackSize = 8192 - cleanStack;
fprintf(stderr, "Maximum stack size: %zu\n", stackSize);
CONTROL(stackSize <= 2048 + 512);
}
size_t const stackSize = g_stack.size;
fprintf(stderr, "Maximum stack size: %zu\n", stackSize);
CONTROL(stackSize <= 2048 + 512);
}

static void test_stack_usage(test_data_t const *data) {
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