Re: [PATCH RFC v2 10/15] vfio/nvgrace-egm: Clear Memory before handing out to VM

[Jason Gunthorpe]

On Thu, Feb 26, 2026 at 06:15:33PM +0000, Shameer Kolothum Thodi wrote:
> The mmap mapping stays alive and accessible in userspace even after
> the close(). Since the release function decrements open_count on close(),
> a second process could then call open() and wipe the mapping while it's
> still live.

fops release is not called until the mmap is closed too, the VMA holds
a struct file pointer as well. close does not call release, close
calls fput and fput calls release when the struct file refcount is 0.

Jason