A quick check shows this test was introduced in 544029862c
selftests/memfd: add tests for F_SEAL_FUTURE_WRITE seal [1]
As this issue does not exist in F-5.4, I think it might have something
to do with B-hwe-5.4.
Run `git grep F_SEAL_FUTURE_WRITE` in B-hwe-5.4 and Focal tree shows the
following is missing on the former:
include/linux/mm.h: * seal_check_future_write - Check for F_SEAL_FUTURE_WRITE
flag and handle it
include/linux/mm.h: * Check whether F_SEAL_FUTURE_WRITE is set; if so, do
proper check/handling on
include/linux/mm.h: if (seals & F_SEAL_FUTURE_WRITE) {
include/linux/mm.h: * Since an F_SEAL_FUTURE_WRITE sealed memfd
can be mapped as
Diff: https://pastebin.ubuntu.com/p/8k5djst6C3/
[1]
https://github.com/torvalds/linux/commit/544029862cbb1d7903e19f2e58f48d4884e1201b
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https://bugs.launchpad.net/bugs/1926142
Title:
memfd from ubuntu_kernel_selftests failed to build on B-5.4
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