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Check that a domain is not tied to the executable file that created it.
For instance, that could happen if a Landlock domain took a reference to
a struct path.
Move global path names to common.h and replace copy_binary() with a more
generic copy_file() helper.
Test coverage for security/landlock is 92.7% of 1133 lines according to
gcc/gcov-14.
Cc: Günther Noack <gnoack@google.com>
Link: https://lore.kernel.org/r/20250108154338.1129069-23-mic@digikod.net
[mic: Update date and add test coverage]
Signed-off-by: Mickaël Salaün <mic@digikod.net>
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