kernel/linux.git/fs/Kconfig.binfmt, branch linux-6.0.y

Merge tag 'm68knommu-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu

2022-05-30T17:56:18+00:00

Pull m68knommu updates from Greg Ungerer: "A collection of changes to add elf-fdpic loader support for m68k. Also a collection of various fixes. They include typo corrections, undefined symbol compilation fixes, removal of the ISA_DMA_API support and removal of unused code. Summary: - correctly set up ZERO_PAGE pointer - drop ISA_DMA_API support - fix comment typos - fixes for undefined symbols - remove unused code and variables - elf-fdpic loader support for m68k" * tag 'm68knommu-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu: m68knommu: fix 68000 CPU link with no platform selected m68k: removed unused "mach_get_ss" m68knommu: fix undefined reference to `mach_get_rtc_pll' m68knommu: fix undefined reference to `_init_sp' m68knommu: allow elf_fdpic loader to be selected m68knommu: add definitions to support elf_fdpic program loader m68knommu: implement minimal regset support m68knommu: use asm-generic/mmu.h for nommu setups m68k: fix typos in comments m68k: coldfire: drop ISA_DMA_API support m68knommu: set ZERO_PAGE() to the allocated zeroed page

m68knommu: allow elf_fdpic loader to be selected

2022-05-16T03:18:30+00:00

The m68k architecture code is capable of supporting the binfmt_elf_fdpic loader, so allow it to be configured. It is restricted to nommu configurations at this time due to the MMU context structures/code not supporting everything elf_fdpic needs when MMU is enabled. Signed-off-by: Greg Ungerer

binfmt_flat: Remove shared library support

2022-04-22T17:57:18+00:00

In a recent discussion[1] it was reported that the binfmt_flat library support was only ever used on m68k and even on m68k has not been used in a very long time. The structure of binfmt_flat is different from all of the other binfmt implementations because of this shared library support and it made life and code review more effort when I refactored the code in fs/exec.c. Since in practice the code is dead remove the binfmt_flat shared library support and make maintenance of the code easier. [1] https://lkml.kernel.org/r/81788b56-5b15-7308-38c7-c7f2502c4e15@linux-m68k.org Signed-off-by: "Eric W. Biederman" Reviewed-by: Damien Le Moal Acked-by: Vladimir Murzin # ARM Tested-by: Patrice Chotard Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/87levzzts4.fsf_-_@email.froward.int.ebiederm.org

Merge tag 'execve-v5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

2022-03-22T02:16:02+00:00

Pull execve updates from Kees Cook: "Execve and binfmt updates. Eric and I have stepped up to be the active maintainers of this area, so here's our first collection. The bulk of the work was in coredump handling fixes; additional details are noted below: - Handle unusual AT_PHDR offsets (Akira Kawata) - Fix initial mapping size when PT_LOADs are not ordered (Alexey Dobriyan) - Move more code under CONFIG_COREDUMP (Alexey Dobriyan) - Fix missing mmap_lock in file_files_note (Eric W. Biederman) - Remove a.out support for alpha and m68k (Eric W. Biederman) - Include first pages of non-exec ELF libraries in coredump (Jann Horn) - Don't write past end of notes for regset gap in coredump (Rick Edgecombe) - Comment clean-ups (Tom Rix) - Force single empty string when argv is empty (Kees Cook) - Add NULL argv selftest (Kees Cook) - Properly redefine PT_GNU_* in terms of PT_LOOS (Kees Cook) - MAINTAINERS: Update execve entry with tree (Kees Cook) - Introduce initial KUnit testing for binfmt_elf (Kees Cook)" * tag 'execve-v5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: binfmt_elf: Don't write past end of notes for regset gap a.out: Stop building a.out/osf1 support on alpha and m68k coredump: Don't compile flat_core_dump when coredumps are disabled coredump: Use the vma snapshot in fill_files_note coredump/elf: Pass coredump_params into fill_note_info coredump: Remove the WARN_ON in dump_vma_snapshot coredump: Snapshot the vmas in do_coredump coredump: Move definition of struct coredump_params into coredump.h binfmt_elf: Introduce KUnit test ELF: Properly redefine PT_GNU_* in terms of PT_LOOS MAINTAINERS: Update execve entry with more details exec: cleanup comments fs/binfmt_elf: Refactor load_elf_binary function fs/binfmt_elf: Fix AT_PHDR for unusual ELF files binfmt: move more stuff undef CONFIG_COREDUMP selftests/exec: Test for empty string on NULL argv exec: Force single empty string when argv is empty coredump: Also dump first pages of non-executable ELF libraries ELF: fix overflow in total mapping size calculation

binfmt_elf: Introduce KUnit test

2022-03-04T04:38:56+00:00

Adds simple KUnit test for some binfmt_elf internals: specifically a regression test for the problem fixed by commit 8904d9cd90ee ("ELF: fix overflow in total mapping size calculation"). $ ./tools/testing/kunit/kunit.py run --arch x86_64 \ --kconfig_add CONFIG_IA32_EMULATION=y '*binfmt_elf' ... [19:41:08] ================== binfmt_elf (1 subtest) ================== [19:41:08] [PASSED] total_mapping_size_test [19:41:08] =================== [PASSED] binfmt_elf ==================== [19:41:08] ============== compat_binfmt_elf (1 subtest) =============== [19:41:08] [PASSED] total_mapping_size_test [19:41:08] ================ [PASSED] compat_binfmt_elf ================ [19:41:08] ============================================================ [19:41:08] Testing complete. Passed: 2, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0 Cc: Eric Biederman Cc: David Gow Cc: Alexey Dobriyan Cc: "Magnus Groß" Cc: kunit-dev@googlegroups.com Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Kees Cook --- v1: https://lore.kernel.org/lkml/20220224054332.1852813-1-keescook@chromium.org v2: - improve commit log - fix comment URL (Daniel) - drop redundant KUnit Kconfig help info (Daniel) - note in Kconfig help that COMPAT builds add a compat test (David)

elfcore: Replace CONFIG_{IA64, UML} checks with a new option

2022-02-15T22:53:28+00:00

As arm64 is about to introduce MTE-specific phdrs in the core dump, add a common CONFIG_ARCH_BINFMT_ELF_EXTRA_PHDRS option currently selectable by UML_X86 and IA64. Signed-off-by: Catalin Marinas Cc: Eric Biederman Link: https://lore.kernel.org/r/20220131165456.2160675-2-catalin.marinas@arm.com Signed-off-by: Will Deacon

binfmt: remove support for em86 (alpha only)

2021-07-26T05:33:03+00:00

We have a fairly specific alpha binary loader in Linux: running x86 (i386, i486) binaries via the em86 [1] emulator. As noted in the Kconfig option, the same behavior can be achieved via binfmt_misc, for example, more nowadays used for running qemu-user. An example on how to get binfmt_misc running with em86 can be found in Documentation/admin-guide/binfmt-misc.rst The defconfig does not have CONFIG_BINFMT_EM86=y set. And doing a make defconfig && make olddefconfig results in # CONFIG_BINFMT_EM86 is not set ... as we don't seem to have any supported Linux distirbution for alpha anymore, there isn't really any "default" user of that feature anymore. Searching for "CONFIG_BINFMT_EM86=y" reveals mostly discussions from around 20 years ago, like [2] describing how to get netscape via em86 running via em86, or [3] discussing that running wine or installing Win 3.11 through em86 would be a nice feature. The latest binaries available for em86 are from 2000, version 2.2.1 [4] -- which translates to "unsupported"; further, em86 doesn't even work with glibc-2.x but only with glibc-2.0 [4, 5]. These are clear signs that there might not be too many em86 users out there, especially users relying on modern Linux kernels. Even though the code footprint is relatively small, let's just get rid of this blast from the past that's effectively unused. [1] http://ftp.dreamtime.org/pub/linux/Linux-Alpha/em86/v0.4/docs/em86.html [2] https://static.lwn.net/1998/1119/a/alpha-netscape.html [3] https://groups.google.com/g/linux.debian.alpha/c/AkGuQHeCe0Y [4] http://zeniv.linux.org.uk/pub/linux/alpha/em86/v2.2-1/relnotes.2.2.1.html [5] https://forum.teamspeak.com/archive/index.php/t-1477.html Cc: Alexander Viro Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: Linus Torvalds Cc: Greg Kroah-Hartman Cc: Jonathan Corbet Cc: linux-fsdevel@vger.kernel.org Cc: linux-api@vger.kernel.org Cc: linux-alpha@vger.kernel.org Signed-off-by: David Hildenbrand Signed-off-by: Matt Turner

binfmt_flat: allow not offsetting data start

2021-04-18T23:56:37+00:00

Commit 2217b9826246 ("binfmt_flat: revert "binfmt_flat: don't offset the data start"") restored offsetting the start of the data section by a number of words defined by MAX_SHARED_LIBS. As a result, since MAX_SHARED_LIBS is never 0, a gap between the text and data sections always exists. For architectures which cannot support a such gap between the text and data sections (e.g. riscv nommu), flat binary programs cannot be executed. To allow an architecture to request no data start offset to allow for contiguous text and data sections for binaries flagged with FLAT_FLAG_RAM, introduce the new config option CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET. Using this new option, the macro DATA_START_OFFSET_WORDS is conditionally defined in binfmt_flat.c to MAX_SHARED_LIBS for architectures tolerating or needing the data start offset (CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET disabled case) and to 0 when CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET is enabled. DATA_START_OFFSET_WORDS is used in load_flat_file() to calculate the data section length and start position. Signed-off-by: Damien Le Moal Signed-off-by: Greg Ungerer

Merge branch 'work.elf-compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2021-02-21T17:29:23+00:00

Pull ELF compat updates from Al Viro: "Sanitizing ELF compat support, especially for triarch architectures: - X32 handling cleaned up - MIPS64 uses compat_binfmt_elf.c both for O32 and N32 now - Kconfig side of things regularized Eventually I hope to have compat_binfmt_elf.c killed, with both native and compat built from fs/binfmt_elf.c, with -DELF_BITS={64,32} passed by kbuild, but that's a separate story - not included here" * 'work.elf-compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: get rid of COMPAT_ELF_EXEC_PAGESIZE compat_binfmt_elf: don't bother with undef of ELF_ARCH Kconfig: regularize selection of CONFIG_BINFMT_ELF mips compat: switch to compat_binfmt_elf.c mips: don't bother with ELF_CORE_EFLAGS mips compat: don't bother with ELF_ET_DYN_BASE mips: KVM_GUEST makes no sense for 64bit builds... mips: kill unused definitions in binfmt_elf[on]32.c mips binfmt_elf*32.c: use elfcore-compat.h x32: make X32, !IA32_EMULATION setups able to execute x32 binaries [amd64] clean PRSTATUS_SIZE/SET_PR_FPVALID up properly elf_prstatus: collect the common part (everything before pr_reg) into a struct binfmt_elf: partially sanitize PRSTATUS_SIZE and SET_PR_FPVALID

c6x: remove architecture

2021-01-20T08:30:45+00:00

The c6x architecture was added to the kernel in 2011 at a time when running Linux on DSPs was widely seen as the logical evolution. It appears the trend has gone back to running Linux on Arm based SoCs with DSP, using a better supported software ecosystem, and having better real-time behavior for the DSP code. An example of this is TI's own Keystone2 platform. The upstream kernel port appears to no longer have any users. Mark Salter remained avaialable to review patches, but mentioned that he no longer has access to working hardware himself. Without any users, it's best to just remove the code completely to reduce the work for cross-architecture code changes. Many thanks to Mark for maintaining the code for the past ten years. Link: https://lore.kernel.org/lkml/41dc7795afda9f776d8cd0d3075f776cf586e97c.camel@redhat.com/ Signed-off-by: Arnd Bergmann