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mm: cma: restrict base_pfn exposure

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

Change-Id: If454194cc5e7639f33b2e1dd29f5d925a17340c1
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Prakash Gupta 2019-08-06 12:30:09 +05:30 • committed by Isaac J. Manjarres
commit 01151d5fcf
1 changed files with 13 additions and 6 deletions
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19
mm/cma_debug.c
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@ -24,12 +24,18 @@ struct cma_mem {
static int cma_debugfs_get(void *data, u64 *val)
{
unsigned long *p = data;
int ret = -EPERM;
*val = *p;
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)
{
@ -174,9 +180,10 @@ static void cma_debugfs_add_one(struct cma *cma, struct dentry *root_dentry)
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);