[Bug libc/31784] RFE: ability to control ambient caps in posix_spawn/pidfd_spawn

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31784

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

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                 CC|                            |adhemerval.zanella at linaro dot o
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--- Comment #6 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
There are projects like rsyscall [1], which essentially exposes clone as a
first-order interface and makes process creation a server-like interface where
the caller issues the syscall commands to be executed in the child.  This
allows for great flexibility (since it bypass libc for process creation), but
it is somewhat complex and I am not sure of the implication of trying to adjust
the idea for a libc-like interface.

Another approach is a fork-like interface (where you can add some flags to
define what is shared or to gate the clone flags) along with a callback.  It
has the issue of what kind of function the callback would be possible to run
(and historically users over-abused it to overcome its limitations).

[1] http://catern.com/rsys21.pdf

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