Rich Felker <dalias@xxxxxxxxxx> writes: > On Fri, Jan 09, 2015 at 09:09:41PM +0000, Al Viro wrote: > The "magic open-once magic symlink" approach is really the cleanest > solution I can find. In the case where the interpreter does not open > the script, nothing terribly bad happens; the magic symlink just > sticks around until _exit or exec. In the case where the interpreter > opens it more than once, you get a failure, but as far as I know > existing interpreters don't do this, and it's arguably bad design. In > any case it's a caught error. And it doesn't work without introducing security vulnerabilities into the kernel, because it breaks close-on-exec semantics. All you have to do is pick a file descriptor, good canidates are 0 and 255 and make it a convention that that file descriptor is used for fexecve. At least when you want to support scripts. Otherwise you can set close-on-exec. That results in no accumulation of file descriptors because everyone always uses the same file descriptor. Regardless you don't have a patch and you aren't proposing code and the code isn't actually broken so please go away. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
