Quoting Michael Kerrisk (mtk.manpa...@gmail.com):
> Rafael,
>
> As discussed in
> http://thread.gmane.org/gmane.linux.kernel/1249726/focus=1288990,
> the capability introduced in 4d7e30d98939a0340022ccd49325a3d70f7e0238
> to govern EPOLLWAKEUP seems misnamed: this capability is about governing
> the ability to suspend the system, not using a particular API flag
> (EPOLLWAKEUP). We should make the name of the capability more general
> to encourage reuse in related cases. (Whether or not this capability
> should also be used to govern the use of /sys/power/wake_lock is a
> question that needs to be separately resolved.)
>
> This patch renames the capability to CAP_BLOCK_SUSPEND. In order to ensure
> that the old capability name doesn't make it out into the wild, could you
> please apply and push up the tree to ensure that it is incorporated
> for the 3.5 release.
>
> Thanks,
>
> Michael
>
> Signed-off-by: Michael Kerrisk <mtk.manpa...@gmail.com>
I definately like that name better, thanks. Don't know if renaming it
without an alias could cause trouble for some bleeding edge userspaces?
Would it be worth keeping the
#define CAP_EPOLLWAKEUP 36
line? If this is deemed early enough I do prefer not to complicate with
a duplicate name.
Acked-by: Serge Hallyn <serge.hal...@canonical.com>
>
> ---
> fs/eventpoll.c | 2 +-
> include/linux/capability.h | 6 +++---
> include/linux/eventpoll.h | 2 +-
> 3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/eventpoll.c b/fs/eventpoll.c
> index 74598f6..1c8b556 100644
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c
> @@ -1710,7 +1710,7 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
> goto error_tgt_fput;
>
> /* Check if EPOLLWAKEUP is allowed */
> - if ((epds.events & EPOLLWAKEUP) && !capable(CAP_EPOLLWAKEUP))
> + if ((epds.events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
> epds.events &= ~EPOLLWAKEUP;
>
> /*
> diff --git a/include/linux/capability.h b/include/linux/capability.h
> index 68d56ef..d10b7ed 100644
> --- a/include/linux/capability.h
> +++ b/include/linux/capability.h
> @@ -360,11 +360,11 @@ struct cpu_vfs_cap_data {
>
> #define CAP_WAKE_ALARM 35
>
> -/* Allow preventing system suspends while epoll events are pending */
> +/* Allow preventing system suspends */
>
> -#define CAP_EPOLLWAKEUP 36
> +#define CAP_BLOCK_SUSPEND 36
>
> -#define CAP_LAST_CAP CAP_EPOLLWAKEUP
> +#define CAP_LAST_CAP CAP_BLOCK_SUSPEND
>
> #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
>
> diff --git a/include/linux/eventpoll.h b/include/linux/eventpoll.h
> index 6f8be32..f4bb378 100644
> --- a/include/linux/eventpoll.h
> +++ b/include/linux/eventpoll.h
> @@ -34,7 +34,7 @@
> * re-allowed until epoll_wait is called again after consuming the wakeup
> * event(s).
> *
> - * Requires CAP_EPOLLWAKEUP
> + * Requires CAP_BLOCK_SUSPEND
> */
> #define EPOLLWAKEUP (1 << 29)
>
> --
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