On Fri, Apr 16, 2021 at 8:42 PM Al Viro <v...@zeniv.linux.org.uk> wrote:
> On Fri, Apr 16, 2021 at 08:32:20PM -0700, Alexei Starovoitov wrote:
> > From: Alexei Starovoitov <a...@kernel.org>
> >
> > Add bpf_sys_close() helper to be used by the syscall/loader program to close
> > intermediate FDs and other cleanup.
> Conditional NAK.  In a lot of contexts close_fd() is very much unsafe.
> In particular, anything that might call it between fdget() and fdput()
> is Right Fucking Out(tm).
> In which contexts can that thing be executed?

user context only.
It's not for all of bpf _obviously_.

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