fs: Expand __receive_fd() to accept existing fd
Expand __receive_fd() with support for replace_fd() for the coming seccomp "addfd" ioctl(). Add new wrapper receive_fd_replace() for the new behavior and update existing wrappers to retain old behavior. Thanks to Colin Ian King <colin.king@canonical.com> for pointing out an uninitialized variable exposure in an earlier version of this patch. Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Dmitry Kadashev <dkadashev@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: linux-fsdevel@vger.kernel.org Reviewed-by:Sargun Dhillon <sargun@sargun.me> Acked-by:
Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by:
Kees Cook <keescook@chromium.org>
parent
910d2f16
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