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Commit 71d6cbd1 authored by Prakash Gupta's avatar Prakash Gupta
Browse files

mm: cma: restrict base_pfn exposure 



We are exposing cma region's base_pfn without any restriction. Make this
dependent on kptr_restrict configuration.

Change-Id: If454194cc5e7639f33b2e1dd29f5d925a17340c1
Signed-off-by: default avatarPrakash Gupta <guptap@codeaurora.org>
parent d303f923

mm/cma_debug.c

+13 −6
Original line number Diff line number Diff line
@@ -26,12 +26,18 @@ static struct dentry *cma_debugfs_root; 
static int cma_debugfs_get(void *data, u64 *val)

{

	unsigned long *p = data;

	int ret = -EPERM;



	if (kptr_restrict == 0) {

		*val = *p;

		ret = 0;

	} else {

		*val = 0;

	}



	return 0;

	return ret;

}

DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");

DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "0x%lx\n");



static int cma_used_get(void *data, u64 *val)

{
@@ -176,9 +182,10 @@ static void cma_debugfs_add_one(struct cma *cma, int idx) 
	debugfs_create_file("free", 0200, tmp, cma, &cma_free_fops);

	debugfs_create_file("base_pfn", 0444, tmp,

			    &cma->base_pfn, &cma_debugfs_fops);

	debugfs_create_file("count", 0444, tmp, &cma->count, &cma_debugfs_fops);

	debugfs_create_file("order_per_bit", 0444, tmp,

			    &cma->order_per_bit, &cma_debugfs_fops);



	debugfs_create_ulong("count", 0444, tmp, &cma->count);

	debugfs_create_u32("order_per_bit", 0444, tmp,

			     (u32 *)&cma->order_per_bit);

	debugfs_create_file("used", 0444, tmp, cma, &cma_used_fops);

	debugfs_create_file("maxchunk", 0444, tmp, cma, &cma_maxchunk_fops);