Re: [PATCH 2/2] mm: introduce MAP_VALIDATE, a mechanism for for safely defining new mmap flags
From: Dan Williams <hidden>
Date: 2017-09-01 01:01:04
Also in:
linux-mm, nvdimm
On Thu, Aug 31, 2017 at 3:03 AM, Christoph Hellwig [off-list ref] wrote:
quoted
+/* + * The historical set of flags that all mmap implementations implicitly + * support when file_operations.mmap_supported_mask is zero. With the + * mmap3 syscall the deprecated MAP_DENYWRITE and MAP_EXECUTABLE bit + * values are explicitly rejected with EOPNOTSUPP rather than being + * silently accepted. + */no mmap3 syscall here :)
True, that's stale.
Do you also need to update the nommu mmap implementation?
Ugh, nommu defeats the MAP_SHARED_VALIDATE proposal from Linus.
if ((flags & MAP_TYPE) != MAP_PRIVATE &&
(flags & MAP_TYPE) != MAP_SHARED)
return -EINVAL;
...parisc strikes again.