Am 28.11.2015 um 23:52 schrieb Mickaël Salaün: > > On 28/11/2015 22:40, Richard Weinberger wrote: >> Am 28.11.2015 um 22:32 schrieb Mickaël Salaün: >>> Replace the default insecure mode 0777 with 0700 for temporary file. >>> >>> Prohibit other users to change the executable mapped code. >> >> Hmm, isn't the tmp file already unlinked at this stage? >> > > Yes, but if someone could open it before the unlink e.g. because of the umask > (which does not seems to be the case thanks to mkstemp, but remains > unspecified [1]), this user should then be able to have write access to the > file descriptor/description.
Yes, someone can open it before the unlink. But you change the file mode after that. How does it improve the situation? The attacker has already the file handle. Thanks, //richard ------------------------------------------------------------------------------ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
