David Hildenbrand <david@xxxxxxxxxx> writes:
On 01.04.23 01:50, Ackerley Tng wrote:
For memfd_restricted() calls without a userspace mount, the backing
file should be the shmem mount in the kernel, and the size of backing
pages should be as defined by system-wide shmem configuration.
If a userspace mount is provided, the size of backing pages should be
as defined in the mount.
Also includes negative tests for invalid inputs, including fds
representing read-only superblocks/mounts.
When you talk about "hugepage" in this patch, do you mean THP or
hugetlb? I suspect thp, so it might be better to spell that out. IIRC,
there are plans to support actual huge pages in the future, at which
point "hugepage" terminology could be misleading.
Thanks for pointing this out! I've replaced references to hugepage with
thp, please see RFC v4 at
https://lore.kernel.org/lkml/cover.1681176340.git.ackerleytng@xxxxxxxxxx/T/
Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx>
---
tools/testing/selftests/Makefile | 1 +
.../selftests/restrictedmem/.gitignore | 3 +
.../testing/selftests/restrictedmem/Makefile | 15 +
.../testing/selftests/restrictedmem/common.c | 9 +
.../testing/selftests/restrictedmem/common.h | 8 +
.../restrictedmem_hugepage_test.c | 486 ++++++++++++++++++
6 files changed, 522 insertions(+)
create mode 100644 tools/testing/selftests/restrictedmem/.gitignore
create mode 100644 tools/testing/selftests/restrictedmem/Makefile
create mode 100644 tools/testing/selftests/restrictedmem/common.c
create mode 100644 tools/testing/selftests/restrictedmem/common.h
create mode 100644
tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c
...
