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 e72LVpLM 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Sep 27, 2024 at 10:04:25AM GMT, Christian Brauner wrote: > On Thu, Sep 26, 2024 at 08:52:32AM GMT, Shakeel Butt wrote: > > On Thu, Sep 26, 2024 at 04:10:19PM GMT, Lorenzo Stoakes wrote: > > > The process_madvise() call was introduced in commit ecb8ac8b1f14 > > > ("mm/madvise: introduce process_madvise() syscall: an external memory > > > hinting API") as a means of performing madvise() operations on another > > > process. > > > > > > However, as it provides the means by which to perform multiple madvise() > > > operations in a batch via an iovec, it is useful to utilise the same > > > interface for performing operations on the current process rather than a > > > remote one. > > > > > > Commit 22af8caff7d1 ("mm/madvise: process_madvise() drop capability check > > > if same mm") removed the need for a caller invoking process_madvise() on > > > its own pidfd to possess the CAP_SYS_NICE capability, however this leaves > > > the restrictions on operation in place. > > > > > > Resolve this by only applying the restriction on operations when accessing > > > a remote process. > > > > > > Moving forward we plan to implement a simpler means of specifying this > > > condition other than needing to establish a self pidfd, perhaps in the form > > > of a sentinel pidfd. > > > > > > Also take the opportunity to refactor the system call implementation > > > abstracting the vectorised operation. > > > > > > Signed-off-by: Lorenzo Stoakes > > > > Acked-by: Shakeel Butt > > > > > --- > > > v3: > > > * Avoid introducing PR_MADV_SELF and defer a non-pidfd version until later. > > > > Seems like a good plan to decouple this patch from PR_MADV_SELF vs > > PIDFD_SELF decision. I am hoping to see the follow up patch as well. > > PIDFD_SELF should absolutely not be a per-system call thing. It should > be generic across all pidfd based system calls similar to AT_FDCWD. > > IOW, that should be in: > > include/uapi/linux/pidfd.h > > #define PIDFD_SELF -200 Yes this is what I was saying elsewhere in the thread :) this is why it's important to have this as a separate enterprise. And indeed this is the intent, I will be working on a separate patch series to this effect. It also gives us the space to implement it in calls which use pidfd where it makes sense and to extend testing accordingly.