[LTP] [PATCH] syscalls/userfaultfd01: Always require CAP_SYS_PTRACE

[Yang Xu]

Hi Peter

> Hi Xu,
>
>> Since commit cefdca0a86be ("userfaultfd/sysctl: add vm.unprivileged_userfaultfd").
>> , it adds a global sysctl knob "vm.unprivileged_userfaultfd" to control whether
>> unprivileged users can use the userfaultfd system calls.  Set this to 1 to allow
>> unprivileged users to use the userfaultfd system calls, or set this to 0 to
>> restrict userfaultfd to only privileged users (with SYS_CAP_PTRACE capability).The
>> default value is 1. In order to use userfaultfd always, require CAP_SYS_PTRACE.
>> Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
> Good idea, thanks!

We have pushed "syscalls/userfaultfd01: add hint about unprivileged_userfaultfd" patch(v2)[1].

This is v1.  li Wang and me both think adding hint is more wise, more info see[2].

[1] https://github.com/linux-test-project/ltp/commit/7dc571d3ad1908d6e50163a06ef848f096fe880a
[2] http://lists.linux.it/pipermail/ltp/2020-January/014921.html

Best Regards
Yang Xu

> Kind regards,
> Petr
>
>


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