Re: [PATCH v4 2/5] fs: Add fchmodat2()

On Jul 27 2023, David Laight wrote:

From: Aleksa Sarai

quoted

Sent: 25 July 2023 17:36

...

quoted

We almost certainly want to support AT_EMPTY_PATH at the same time.
Otherwise userspace will still need to go through /proc when trying to
chmod a file handle they have.

That can't be allowed.

IIUC, fchmodat2(fd, "", m, AT_EMPTY_PATH) is equivalent to fchmod(fd,
m).  With that, new architectures only need to implement the fchmodat2
syscall to cover all chmod variants.

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