[PATCH 6/7] lkdtm: crash on overwriting protected pmalloc var

On 3/6/18 9:05 AM, J Freyensee wrote:

quoted

? +#ifdef CONFIG_PROTECTABLE_MEMORY
+void lkdtm_WRITE_RO_PMALLOC(void)
+{
+??? struct gen_pool *pool;
+??? int *i;
+
+??? pool = pmalloc_create_pool("pool", 0);
+??? if (unlikely(!pool)) {
+??????? pr_info("Failed preparing pool for pmalloc test.");
+??????? return;
+??? }
+
+??? i = (int *)pmalloc(pool, sizeof(int), GFP_KERNEL);
+??? if (unlikely(!i)) {
+??????? pr_info("Failed allocating memory for pmalloc test.");
+??????? pmalloc_destroy_pool(pool);
+??????? return;
+??? }
+
+??? *i = INT_MAX;
+??? pmalloc_protect_pool(pool);
+
+??? pr_info("attempting bad pmalloc write at %p\n", i);
+??? *i = 0;

Opps, disregard this, this is the last series of this patch series, not 
the most recent one :-(.

Seems harmless, but I don't get why *i local variable needs to be set 
to 0 at the end of this function.


Otherwise,

Reviewed-by: Jay Freyensee <redacted>

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