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John Hubbard 504d8a5e0f selftests/mm: mseal, self_elf: fix missing __NR_mseal 
Patch series "cleanups, fixes, and progress towards avoiding "make
headers"", v3.

Eventually, once the build succeeds on a sufficiently old distro, the idea
is to delete $(KHDR_INCLUDES) from the selftests/mm build, and then after
that, from selftests/lib.mk and all of the other selftest builds.

For now, this series merely achieves a clean build of selftests/mm on a
not-so-old distro: Ubuntu 23.04.  In other words, after this series is
applied, it is possible to delete $(KHDR_INCLUDES) from
selftests/mm/Makefile and the build will still succeed.

1. Add tools/uapi/asm/unistd_[32|x32|64].h files, which include
   definitions of __NR_mseal, and include them (indirectly) from the files
   that use __NR_mseal.  The new files are copied from ./usr/include/asm,
   which is how we have agreed to do this sort of thing, see [1].

2. Add fs.h, similarly created: it was copied directly from a snapshot
   of ./usr/include/linux/fs.h after running "make headers".

3. Add a few selected prctl.h values that the ksm and mdwe tests require.

4. Factor out some common code from mseal_test.c and seal_elf.c, into
   a new mseal_helpers.h file.

5. Remove local __NR_* definitions and checks.

[1] commit e076eaca59 ("selftests: break the dependency upon local
header files")


This patch (of 6):

The selftests/mm build isn't exactly "broken", according to the current
documentation, which still claims that one must run "make headers",
before building the kselftests.  However, according to the new plan to
get rid of that requirement [1], they are future-broken: attempting to
build selftests/mm *without* first running "make headers" will fail due
to not finding __NR_mseal.

Therefore, include asm-generic/unistd.h, which has all of the system
call numbers that are needed, abstracted across the various CPU arches.

Some explanation in support of this "asm-generic" approach:

For most user space programs, the header file inclusion behaves as per
this microblaze example, which comes from David Hildenbrand (thanks!):

     arch/microblaze/include/asm/unistd.h
         -> #include <uapi/asm/unistd.h>

     arch/microblaze/include/uapi/asm/unistd.h
         -> #include <asm/unistd_32.h>
         -> Generated during "make headers"

     usr/include/asm/unistd_32.h is generated via
     arch/microblaze/kernel/syscalls/Makefile with the syshdr command.

     So we never end up including asm-generic/unistd.h directly on
     microblaze... [2]

However, those programs are installed on a single computer that has a
single set of asm and kernel headers installed.

In contrast, the kselftests are quite special, because they must
provide a set of user space programs that:

     a) Mostly avoid using the installed (distro) system header files.

     b) Build (and run) on all supported CPU architectures

     c) Occasionally use symbols that have so new that they have not
        yet been included in the distro's header files.

Doing (a) creates a new problem: how to get a set of cross-platform
headers that works in all cases.

Fortunately, asm-generic headers solve that one.  Which is why we need
to use them here--at least, for particularly difficult headers such as
unistd.h.

The reason this hasn't really come up yet, is that until now, the
kselftests requirement (which I'm trying to eventually remove) was that
"make headers" must first be run.  That allowed the selftests to get a
snapshot of sufficiently new header files that looked just like (and
conflict with) the installed system headers.

And as an aside, this is also an improvement over past practices of
simply open-coding in a single (not per-arch) definition of a new
symbol, directly into the selftest code.

[1] commit e076eaca59 ("selftests: break the dependency upon local
header files")

[2] https://lore.kernel.org/all/0b152bea-ccb6-403e-9c57-08ed5e828135@redhat.com/

Link: https://lkml.kernel.org/r/20240618022422.804305-1-jhubbard@nvidia.com
Link: https://lkml.kernel.org/r/20240618022422.804305-2-jhubbard@nvidia.com
Fixes: 4926c7a52d ("selftest mm/mseal memory sealing")
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Andrei Vagin <avagin@google.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Kees Cook <kees@kernel.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rich Felker <dalias@libc.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-07-03 19:30:06 -07:00
arch arch/x86: do not explicitly clear Reserved flag in free_pagetable 2024-07-03 19:30:02 -07:00
block block: unmap and free user mapped integrity via submitter 2024-06-12 11:00:50 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
Documentation Documentation/admin-guide/mm/pagemap.rst: drop "Using pagemap to do something useful" 2024-07-03 19:30:06 -07:00
drivers ata fixes for 6.10-rc6 2024-06-30 14:32:24 -07:00
fs fs/proc: move page_mapcount() to fs/proc/internal.h 2024-07-03 19:30:06 -07:00
include mm/highmem: make nr_free_highpages() return "unsigned long" 2024-07-03 19:30:06 -07:00
init gcc: disable '-Warray-bounds' for gcc-9 2024-06-15 10:43:04 -07:00
io_uring io_uring: signal SQPOLL task_work with TWA_SIGNAL_NO_IPI 2024-06-24 19:46:15 -06:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel mm: remove the implementation of swap_free() and always use swap_free_nr() 2024-07-03 19:30:01 -07:00
lib lib: test_hmm: add missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:05 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: swap: remove 'synchronous' argument to swap_read_folio() 2024-07-03 19:30:06 -07:00
net NFS client bugfixes for Linux 6.10 2024-06-29 13:48:24 -07:00
rust rust: avoid unused import warning in rusttest 2024-06-11 23:33:28 +02:00
samples kmemleak-test: add missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:04 -07:00
scripts kbuild: scripts/gdb: bring the "abspath" back 2024-06-27 04:20:32 +09:00
security lsm/stable-6.10 PR 20240617 2024-06-17 18:35:12 -07:00
sound ASoC: Fixes for v6.10 2024-06-26 22:02:55 +02:00
tools selftests/mm: mseal, self_elf: fix missing __NR_mseal 2024-07-03 19:30:06 -07:00
usr kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
virt KVM fixes for 6.10 2024-06-21 08:03:55 -04:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap bpf-for-netdev 2024-06-14 17:57:10 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS IOMMU Fixes for Linux v6.10-rc5 2024-06-28 09:18:01 -07:00
Makefile Linux 6.10-rc6 2024-06-30 14:40:44 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.