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    Subject[PATCH 5.11 326/329] debugfs: Make debugfs_allow RO after init
    Date
    From: Kees Cook <keescook@chromium.org>

    commit 312723a0b34d6d110aa4427a982536bb36ab8471 upstream.

    Since debugfs_allow is only set at boot time during __init, make it
    read-only after being set.

    Fixes: a24c6f7bc923 ("debugfs: Add access restriction option")
    Cc: Peter Enderborg <peter.enderborg@sony.com>
    Reviewed-by: Peter Enderborg <peter.enderborg@sony.com>
    Signed-off-by: Kees Cook <keescook@chromium.org>
    Link: https://lore.kernel.org/r/20210405213959.3079432-1-keescook@chromium.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    fs/debugfs/inode.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/debugfs/inode.c
    +++ b/fs/debugfs/inode.c
    @@ -35,7 +35,7 @@
    static struct vfsmount *debugfs_mount;
    static int debugfs_mount_count;
    static bool debugfs_registered;
    -static unsigned int debugfs_allow = DEFAULT_DEBUGFS_ALLOW_BITS;
    +static unsigned int debugfs_allow __ro_after_init = DEFAULT_DEBUGFS_ALLOW_BITS;

    /*
    * Don't allow access attributes to be changed whilst the kernel is locked down

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