On Wed, Jan 26, 2022 at 11:44:47AM +0000, Ariadne Conill wrote: > Interestingly, Michael Kerrisk opened an issue about this in 2008[1], > but there was no consensus to support fixing this issue then. > Hopefully now that CVE-2021-4034 shows practical exploitative use > of this bug in a shellcode, we can reconsider. > > [0]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html > [1]: https://bugzilla.kernel.org/show_bug.cgi?id=8408 Having now read 8408 ... if ABI change is a concern (and I really doubt it is), we could treat calling execve() with a NULL argv as if the caller had passed an array of length 1 with the first element set to NULL. Just like we reopen fds 0,1,2 for suid execs if they were closed.
