CVE-2024-42265 Information

Description

In the Linux kernel the following vulnerability has been resolved:

protect the fetch of ->fd[fd] in do_dup2() from mispredictions

both callers have verified that fd is not greater than ->max_fds; however misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That’s wrong for the same reasons why it’s wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path.

Reference

https://git.kernel.org/stable/c/5db999fff545b924b24c9afd368ef5c17279b176 https://git.kernel.org/stable/c/da72e783afd27d9f487836b2e6738146c0edd149 https://git.kernel.org/stable/c/1171ceccabfd596ca370c5d2cbb47d110c3f2fe1 https://git.kernel.org/stable/c/8aa37bde1a7b645816cda8b80df4753ecf172bf1