[ Upstream commit 358fcf5ddbec4e6706405847d6a666f5933a6c25 ]
When the kernel is locked down the kernel allows reading only debugfs
files with mode 444. Mode 400 is also valid but is not allowed.
Make the 444 into a mask.
Fixes:
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| .. | ||
| Makefile | ||
| file.c | ||
| inode.c | ||
| internal.h | ||