November 2023 - linux-morello - op-lists.linaro.org

[PATCH 00/12] Switch to capability-based uaccess

by Kevin Brodsky

Hi, This series switches all uaccess routines to operate directly on the user-provided capability pointer in PCuABI, instead of making the access via the extracted 64-bit address. This means that all forms of uaccess now enforce the capability metadata, through the use of capability-based loads and stores, and will fail with -EFAULT following a failed (hardware) capability check. The impacted routines are: - *get_user* (including get_user_ptr) - *put_user* (including put_user_ptr) - *copy_from_user* (including copy_from_user_with_ptr) - *copy_to_user* (including copy_to_user_with_ptr) (Note that futex operations are already checked thanks to Luca's work [1].) Enabling capability checks in uaccess exposed a variety of issues, both in the kernel and in userspace. This series addresses the fallout in the kernel before making the switch: - Patch 1-3 overhaul strnlen_user() to prevent it from reading beyond the bounds of the user pointer, while leaving its implementation unchanged in !PCuABI. - Patch 4-6 fixes various capability propagation issues (surprisingly few of those!). - Patch 7 fixes a bug in a Morello kselftest, detected through capability checking in copy_from_user(). Finally, the switch to capability-based accesses is made: - Patch 8-10 switch {get,put}_user and variants. - Patch 11-12 switch copy_{from,to}_user and variants. After this series, the Morello kselftests and Musl tests still pass, and so do the liburing tests, however the LTP syscalls suite doesn't because of various issues in LTP itself. I have addressed a number of them upstream [2] (series already merged), and will post the remaining fixes to linux-morello-ltp. Because this precise uaccess checking cannot be achieved with most existing sanitisers or hardware memory safety mechanisms, further bugs are likely to be identified in low-level libraries and test suites running in purecap (I have spotted a couple in the Bionic tests). Issue: https://git.morello-project.org/morello/kernel/linux/-/issues/5 Review branch: https://git.morello-project.org/kbrodsky-arm/linux/-/commits/morello/checke… Cheers, Kevin [1] https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… [2] https://lore.kernel.org/ltp/20231023135647.2157030-1-kevin.brodsky@arm.com/ Kevin Brodsky (12): linux/user_ptr.h: Introduce user_ptr_{base,limit} lib: Refactor do_strnlen_user() lib: Make strnlen_user() PCuABI-friendly block: Eliminate invalid user pointer casts tty: Convert another ioctl helper to take arg as user_uintptr_t seccomp: Preserve pointers when reading sock_fprog from userspace kselftests/arm64: morello: Fix message size in mmap test arm64: morello: Implement user capability accessors inline arm64: uaccess: Move macros from futex.h to uaccess.h arm64: uaccess: Switch to capability-based {get,put}_user in PCuABI arm64: lib: Simplify copy_*_user register allocation arm64: lib: Switch to capability-based copy_*_user in PCuABI Documentation/core-api/user_ptr.rst | 13 ++ arch/arm64/include/asm/assembler.h | 8 + arch/arm64/include/asm/futex.h | 20 +-- arch/arm64/include/asm/gpr-num.h | 6 +- arch/arm64/include/asm/morello.h | 4 - arch/arm64/include/asm/uaccess.h | 49 +++++- arch/arm64/lib/copy_from_user.S | 33 +++- arch/arm64/lib/copy_template.S | 14 +- arch/arm64/lib/copy_to_user.S | 17 +- arch/arm64/lib/morello.S | 23 --- block/blk-zoned.c | 6 +- block/ioctl.c | 22 +-- drivers/tty/tty_ioctl.c | 2 +- include/linux/blkdev.h | 8 +- include/linux/tty.h | 2 +- include/linux/user_ptr.h | 44 +++++ kernel/seccomp.c | 2 +- lib/strnlen_user.c | 163 +++++++++++++++---- tools/testing/selftests/arm64/morello/mmap.c | 2 +- 19 files changed, 319 insertions(+), 119 deletions(-) -- 2.38.1

3 months, 2 weeks

3
24
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[PATCH RFC v2 00/19] Introduce mm reservation interface for PCuABI

by Amit Daniel Kachhap

Hi All, This patch series introduces the mm reservation interface to manage the owning capability of the allocated addresses. As compared to the RFC v1, this series adds reservation details in the VMA structure. Looking for feedback regarding interface names, interface directory structure etc. Patch [1-11] manages capability bounds via reservation interface. Patch [12-19] adds support for managing capability permissions. Details about several rules implemented can be found in PCuABI spec here [1]. Changes in RFC v2: 1) Removed separate maple tree structures for the reservation interface and modified the vma structure to add the reservation details. As most of the mmap/munmap operations happen per-vma so this reduced the code churnings. However this approach will increase time-complexity of syscalls which operate across vma's such as mlock, madvise etc. get_unmapped_area() which generated free unmapped virtual address may now need more iterations. 2) Added Cheri base representability and length representability modifications. Now get_unmapped_area() will generate CHERI representable addresses. 3) Added new PCuABI changes for mincore() syscall. 4) Added changes for compat64. Future works: 1) Users of vm_mmap/vm_munmap() i.e. filesystems, loaders, kexec etc to be modified to preserve capability addresses. 2) Cover remaining memory addressing syscalls. Testing: 1) All tests by Chaitanya in v4 selftests [2] passes. 2) Purecap/Compat Busybox boot passes after adding [WIP] patches present in [3]. The whole series can be found here [3]. [1]: https://git.morello-project.org/morello/kernel/linux/-/wikis/Morello-pure-c… [2]: https://git.morello-project.org/chaitanya_prakash/linux.git review/purecap_mmap_testcases [3]: https://git.morello-project.org/amitdaniel/linux.git review/purecap_mm_reservation_v2 Thanks, Amit Daniel Amit Daniel Kachhap (19): uapi: errno.h: Introduce PCuABI memory reservation error arm64: morello: Add VM_PCUABI_RESERVE flags mm: Add capability reservation interfaces in vma for PCuABI mm/cap_addr_mgmt: Add capability bound helpers for PCuABI mm/mmap: Modify unmapped address space management code for PCuABI mm/mmap: Use the PCuABI reservations in mmap/munmap mm/mremap: Add the PCuABI reservation interfaces mm/mprotect: Add the PCuABI reservation interfaces mm/madvise: Add the PCuABI reservation interfaces mm/mlock: Add the PCuABI reservation interfaces mm/msync: Add the PCuABI reservation interfaces uapi: mman-common.h: Macros for maximum capability permissions mm/cap_addr_mgmt: Add capability permission helpers for PCuABI mm/cap_addr_mgmt: Reduce the maximum protection check impact mm/mmap: Disable MAP_GROWSDOWN mapping flag for PCuABI mm/mmap: Add capability permission constraints for PCuABI mm/mremap: Add capability permission constraints for PCuABI mm/mprotect: Add capability permission constraints for PCuABI mm/mincore: Add capability constraints for PCuABI arch/arm64/include/asm/cap_addr_mgmt.h | 22 ++ include/linux/cap_addr_mgmt.h | 168 +++++++++++++ include/linux/cheri.h | 3 + include/linux/mm.h | 29 ++- include/linux/mm_types.h | 5 + include/uapi/asm-generic/errno.h | 2 + include/uapi/asm-generic/mman-common.h | 6 + io_uring/advise.c | 2 +- mm/Makefile | 2 +- mm/cap_addr_mgmt.c | 314 +++++++++++++++++++++++++ mm/damon/vaddr.c | 2 +- mm/madvise.c | 27 ++- mm/mincore.c | 46 +++- mm/mlock.c | 38 ++- mm/mmap.c | 182 ++++++++++++-- mm/mprotect.c | 21 +- mm/mremap.c | 109 +++++++-- mm/msync.c | 15 +- mm/util.c | 10 +- 19 files changed, 919 insertions(+), 84 deletions(-) create mode 100644 arch/arm64/include/asm/cap_addr_mgmt.h create mode 100644 include/linux/cap_addr_mgmt.h create mode 100644 mm/cap_addr_mgmt.c -- 2.25.1

4 months, 1 week

2
32
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[PATCH v6 00/13] update bpf syscall for PCuABI/compat64

by Zachary Leaf

Hi, Here's v6. The bpf syscall is updated to propagate user pointers as capabilities in the pure-capability kernel-user ABI (PCuABI). It also includes an approach to support the existing aarch64 ABI (compat64). One complication here is from the fact this syscall supports many multiplexed sub-commands, some of which are themselves multiplexed with a number of further nested/multiplexed options. Another complication is that the existing syscall uses a trick of storing user pointers as u64 to avoid needing a compat handler for 32-bit systems. To retain compatibility with the aarch64 ABI and add Morello support, special compat64 conversion and handling is implemented. Inbound (userspace->kernel) conversion between compat64/native struct layouts is handled upfront on entry to the syscall (with the exception of bpf_xyz_info structs - see patch 8). This minimises changes to sub-command handlers. Some sub-commands require conversion back out to userspace and that by necessity is handled where it occurs. Patch 1 is not essential to this series but it's a nice debug feature to have and works[1]. It enables BPF_PROG_TYPE_TRACEPOINT which many eBPF kselftests use. Patches 5,6,8 implement the core compat64 handling. Each commit compiles cleanly but relevant parts will be broken inbetween. Patch 9 fixes the CHECK_ATTR macro to also check configs passed in via compat64. Patch 11 finally enables capabilities in the kernel. Patches 12,13 handles uaccess that occurs in two eBPF helper functions. The rest are setup/helper functions. Testing wise, see associated LTP changes below as posted to LTP mailing list[2]. The eBPF LTP tests are fairly minimal and test only a small part of the changes here. There's a new test to test CHECK_ATTR from patch 9. The kernel kselftests contain many more extensive eBPF tests. They can be built fairly easily natively on aarch64 which is useful for testing compat64. More work needs to be done here though to: a) enable out-of-tree cross-compilation for purecap as well as x86->aarch64 b) replace ptr_to_u64() with casts to uintptr_t in tests c) general libbpf/bpftool enablement and fixes since many tests rely on this d) CONFIG_DEBUG_INFO_BTF required for many tests but this requires the build system to have a recent version of pahole tool Next steps once we have the core kernel support would be porting libbpf and bpftool for purecap plus work on enabling kselftests as above. Kernel branch available at: https://git.morello-project.org/zdleaf/linux/-/tree/morello/bpf_v6 Associated LTP test/changes at: https://git.morello-project.org/zdleaf/morello-linux-test-project/-/tree/mo… Thanks, Zach [1] [PATCH v3 0/5] Restore syscall tracing on Morello https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… [2] [PATCH v2 0/3] add eBPF support https://op-lists.linaro.org/archives/list/linux-morello-ltp@op-lists.linaro… ----------------------------------------------------------------------- v6: - Re-work BPF_LINK_CREATE memcpy in convert_compat_bpf_attr() v5: - Simplify BPF_LINK_CREATE handling in bpf/syscall.c:convert_compat_bpf_attr() - Add missing bpf_compat_ptr_field() - Re-work/fix check_attr() to catch missing enum bpf_cmd values [...] [0] [RFC PATCH 0/9] update bpf syscall for PCuABI/compat64 https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… [1] [PATCH 00/10] update bpf syscall for PCuABI/compat64 https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… [2] [PATCH v2 00/12] update bpf syscall for PCuABI/compat64 https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… [3] [PATCH v3 00/12] update bpf syscall for PCuABI/compat64 https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… [4] [PATCH v4 00/12] update bpf syscall for PCuABI/compat64 https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… [5] [PATCH v5 00/12] update bpf syscall for PCuABI/compat64 https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… ----------------------------------------------------------------------- Zachary Leaf (13): arm64: morello: enable syscall tracing arch: rename 32bit_compat to compat32 arch: add compat helpers specific to 64-bit stddef: introduce copy_field helper bpf: compat64: add handler and convert bpf_attr in bpf: compat64: bpf_attr convert out bpf/btf: move zero check into btf.c bpf: compat64: handle bpf_{btf,prog,link}_info bpf: compat64: support CHECK_ATTR macro bpf: copy_{to,from}_user_with_ptr helpers bpf: use user pointer types in uAPI structs bpf: use addr for bpf_copy_from_user_with_task bpf: use addr for bpf_copy_from_user .../morello_transitional_pcuabi_defconfig | 2 +- arch/arm64/include/asm/compat.h | 11 +- arch/arm64/include/asm/ftrace.h | 2 +- arch/arm64/include/asm/mmu_context.h | 2 +- arch/arm64/include/asm/syscall.h | 6 +- arch/arm64/kernel/fpsimd.c | 6 +- arch/arm64/kernel/hw_breakpoint.c | 2 +- arch/arm64/kernel/perf_regs.c | 2 +- arch/arm64/kernel/pointer_auth.c | 6 +- arch/arm64/kernel/process.c | 16 +- arch/arm64/kernel/ptrace.c | 10 +- arch/arm64/kernel/signal.c | 2 +- arch/arm64/kernel/syscall.c | 2 +- arch/mips/include/asm/compat.h | 2 +- arch/parisc/include/asm/compat.h | 2 +- arch/powerpc/include/asm/compat.h | 2 +- arch/s390/include/asm/compat.h | 2 +- arch/sparc/include/asm/compat.h | 4 +- arch/x86/include/asm/compat.h | 2 +- drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 2 +- drivers/gpu/drm/amd/amdkfd/kfd_process.c | 2 +- drivers/input/input.c | 2 +- drivers/media/rc/bpf-lirc.c | 6 +- fs/ext4/dir.c | 2 +- fs/nfs/dir.c | 2 +- include/linux/bpf.h | 19 + include/linux/bpf_compat.h | 415 +++++++++ include/linux/bpfptr.h | 28 +- include/linux/compat.h | 16 +- include/linux/stddef.h | 3 + include/uapi/linux/bpf.h | 94 +- kernel/bpf/bpf_iter.c | 2 +- kernel/bpf/btf.c | 104 ++- kernel/bpf/cgroup.c | 9 +- kernel/bpf/hashtab.c | 12 +- kernel/bpf/helpers.c | 9 +- kernel/bpf/net_namespace.c | 6 +- kernel/bpf/offload.c | 2 +- kernel/bpf/syscall.c | 842 ++++++++++++++---- kernel/bpf/verifier.c | 20 +- kernel/time/time.c | 2 +- kernel/trace/bpf_trace.c | 6 +- mm/util.c | 2 +- net/bpf/bpf_dummy_struct_ops.c | 8 +- net/bpf/test_run.c | 31 +- net/core/sock_map.c | 6 +- 46 files changed, 1393 insertions(+), 342 deletions(-) create mode 100644 include/linux/bpf_compat.h -- 2.34.1

4 months, 1 week

2
14
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Linux DRM purecap "RFC"

by Carsten Haitzler

Just thought it's time to share the current state of drm purecap work: Kernel: https://git.morello-project.org/carhai01/linux-drm-purecap/-/commit/7ea169a… DRM: https://git.morello-project.org/carhai01/drm-linux-morello-purecap/-/commit… All the DRM tests ow pass for compat and purecap. I'm of 2 minds in the kernel code. I could go mimic the "copy field" stuff from EBPF but it's still going to be a bit messy. DRM code calls everything "compat" "32" so I'm keeping with that naming scheme (compat for us is 64bit). I've kept the compat structs at the entry points. I could copy to a local "native" struct I guess... It'd mean I carry more local data than I actually need/use. Anyway... comments?

4 months, 4 weeks

2
5
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[PATCH v3 0/5] Provide a vDSO to purecap processes and write tests

by Aditya Deshpande

Hello, This patch series implements a pure-capability vDSO which purecap userspace applications can directly use. It also fixes the vDSO selftests so that they can be built as purecap binaries, therefore allowing the new purecap vDSO to be tested. The existing aarch64 vDSO implementation is unchanged - it has simply been redefined as the compat vDSO. Therefore, processes using both the standard and purecap ABIs will have a vDSO to use. Main changes in v3: * Series has now grown to 5 patches. The first patch duplicates an unmerged upstream change (I forgot to include this in v2). Once it is merged upstream and the fork is rebased this patch may disappear from the log. * Patch 3 adds some purecap-only code to linux/types.h to enable the vDSO, which uses kernel headers, to be built for purecap. * v2 removed the vdso-purecap/ directory, as it needlessly replicated the code in vdso/. vdso/Makefile was instead changed so it could build both vDSOs (regular and purecap) from the same source. This is achieved by calling the Makefile twice with BUILD_PURECAP_VDSO=[y/n]. v3 further changes this Makefile; now all purecap generated files are placed in a separate subdirectory (vdso/purecap.) Aditya Deshpande (5): selftests: vDSO: fix Makefile so that it uses lib.mk correctly selftests/vDSO: Add support for purecap vDSO testing linux/types.h: Redefine uintptr_t to __uintcap_t under purecap arm64: vdso: Build a pure-capability vDSO arm64: vDSO: Provide a purecap vDSO to userspace purecap programs arch/arm64/Makefile | 6 ++ arch/arm64/include/asm/elf.h | 24 +++++--- arch/arm64/include/asm/vdso.h | 1 + arch/arm64/include/asm/vdso/gettimeofday.h | 58 +++++++++++++++--- arch/arm64/kernel/Makefile | 2 + arch/arm64/kernel/vdso-purecap-wrap.S | 22 +++++++ arch/arm64/kernel/vdso.c | 55 ++++++++++++++++- arch/arm64/kernel/vdso/Makefile | 60 ++++++++++++++++--- fs/compat_binfmt_elf.c | 24 ++++---- include/linux/compiler.h | 3 +- include/linux/types.h | 4 ++ tools/testing/selftests/vDSO/Makefile | 16 ++--- tools/testing/selftests/vDSO/parse_vdso.h | 16 +++++ tools/testing/selftests/vDSO/vdso_test_abi.c | 5 +- .../selftests/vDSO/vdso_test_gettimeofday.c | 6 +- 15 files changed, 252 insertions(+), 50 deletions(-) create mode 100644 arch/arm64/kernel/vdso-purecap-wrap.S -- 2.25.1

5 months

2
8
0 0

baremetal program execution on ARM Morello board

by CHANDRAJIT PAL

Hello, I am running baremetal programs on FVP. I compiled using llvm toolchain with baremetal support and created the .axf binaries under the debug directory of the project folder. This .axf executable Is something I like to test on morello board without any OS environment. when I tried to run the .axf binary on the board using the ARM development studio IDE morello edition, under the run> debug config> made the settings and when I I started debugging it gets stuck at the HLT instruction (when performing debug from symbol) or starting from the initial address and going into an infinite loop when starting from entry point. while on the terminal console I couldn't see the output of the printf statement which i was expecting. even if I try to run directly or debug it step by step. (the program is correct because I already tested on FVP) ..I am being redirected to the debug configuration. and iterating thru the same process as described without seeing the actual output on the terminal which I configured with the /dev/ttyusb2 115200 command. Any suggestions please.

5 months

2
1
0 0

baremetal program execution on ARM Morello board

by CHANDRAJIT PAL

Hello, I am running baremetal programs on FVP. I compiled using llvm toolchain with baremetal support and created the .axf binaries under the debug directory of the project folder. This .axf executable Is something I like to test on morello board without any OS environment. when I tried to run the .axf binary on the board using the ARM development studio IDE morello edition, under the run> debug config> made the settings and when I I started debugging it gets stuck at the HLT instruction (when performing debug from symbol) or starting from the initial address and going into an infinite loop when starting from entry point. while on the terminal console I couldn't see the output of the printf statement which i was expecting. even if I try to run directly or debug it step by step. (the program is correct because I already tested on FVP) ..I am being redirected to the debug configuration. and iterating thru the same process as described without seeing the actual output on the terminal which I configured with the /dev/ttyusb2 115200 command. Any suggestions please.

5 months

1
0
0 0

[PATCH V4 00/11] Add testcases for address space management syscalls

by Chaitanya S Prakash

Syscalls operating on memory mappings manage their address space via owning capabilities. They must adhere to a certain set of rules[1] in order to ensure memory safety. Address space management syscalls are only allowed to manipulate mappings that are within the range of the owning capability and have the appropriate permissions. Tests to check the capability's tag, bounds, range as well as permissions have been added. Finally, as certain flags and syscalls conflict with the reservation model or lack implementation, a check to verify appropriate handling of the same has also been added. The mincore() tests are expected to fail in this iteration as they are not fully supported. The next iterations will contain representability testcases. Review branch: https://git.morello-project.org/chaitanya_prakash/linux/-/tree/review/purec… This patch series has been tested on: https://git.morello-project.org/amitdaniel/linux/-/tree/review/purecap_mm_r… [1] https://git.morello-project.org/morello/kernel/linux/-/wikis/Morello-pure-c… Changes in V4: - Corrected subject of cover letter Changes in V3: https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… - Added get_pagesize() function and VERRIFY_ERRNO() macro - Added LoadCap and StoreCap permissions testcase - Added validity_tag_check testcases - Added reservation tests - Renamed variable "addr" to "ptr" to avoid confusion when manipulating both addresses and capabilities - Cleaned up syscall_mmap and syscall_mmap2 testcases - Restructured code into testcases that check tags, range, bounds and permissions - Improved range_check testcases - Improved commit messages - Removed helper functions, tests directly written in testcase functions - Removed signal handling and ddc register testcases Changes in V2: https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… - Added link to the review branch - Removed unnecessary whitespace Changes in V1: https://op-lists.linaro.org/archives/list/linux-morello@op-lists.linaro.org… Chaitanya S Prakash (11): kselftests/arm64: morello: Create wrapper functions for frequently invoked syscalls kselftests/arm64: morello: Add get_pagesize() function kselftests/arm64: morello: Add VERIFY_ERRNO() macro kselftests/arm64: morello: mmap: Clean up existing testcases kselftests/arm64: morello: mmap: Add MAP_GROWSDOWN testcase kselftests/arm64: morello: mmap: Add validity tag check testcases kselftests/arm64: morello: mmap: Add capability range testcases kselftests/arm64: morello: mmap: Add mmap() bounds check testcases kselftests/arm64: morello: mmap: Add mremap() bounds check testcases kselftests/arm64: morello: mmap: Add permission check testcases kselftests/arm64: morello: mmap: Add brk() testcase .../selftests/arm64/morello/bootstrap.c | 13 - .../selftests/arm64/morello/freestanding.c | 16 +- .../selftests/arm64/morello/freestanding.h | 74 ++- tools/testing/selftests/arm64/morello/mmap.c | 547 +++++++++++++++++- 4 files changed, 606 insertions(+), 44 deletions(-) -- 2.25.1

5 months, 1 week

3
21
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[PATCH V7 0/2] Support capabilities for struct mmc_ioc_{multi_}cmd

by Akram Ahmad

Hi everyone, This patch aims to enable purecap applications to make use of the MMC block driver by adding PCuABI support to the MMC_IOC_CMD and MMC_IOC_MULTI_CMD ioctls. This also includes compat64 support for the ioctls. V6 -> V7: Clarify comments on ioctl numbering. V5 -> V6: Fix for ioctl numbering based on struct size; minor corrections. V4 -> V5: Improvement to readability and fix to user-space macro. V3 -> V4: Minor corrections and improvements to readability of code. - Remove unnecessary explicit checks on capabilities. - Revert modification to struct mmc_ioc_multi_cmd. - Remove unnecessary parentheses. V2 -> V3: - Implement support for capabilities in the ioctls. - Correct formatting errors in patches. - Correct formatting and syntax errors in code. V1 -> V2: Various improvements to the code including: - Preference for native structs over (void __user *) - Complying with code styling guidelines - Improvement in code readability via removing unnecessary casts GitLab Issue: https://git.morello-project.org/morello/kernel/linux/-/issues/51 Review branch: https://git.morello-project.org/arkamnite/linux/-/commits/morello%2Fmmc_v7 Many thanks, Akram Akram Ahmad (2): mmc: Implement compat handling for struct mmc_ioc_{multi_}cmd mmc: Support capabilities in MMC_IOC_{MULTI_}CMD ioctls drivers/mmc/core/block.c | 100 ++++++++++++++++++++++++++++++--- include/uapi/linux/mmc/ioctl.h | 19 ++++++- 2 files changed, 108 insertions(+), 11 deletions(-) -- 2.34.1

5 months, 1 week

2
4
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[PATCH v2 1/3] selftests/vDSO: Add support for purecap vDSO testing

by Aditya Deshpande

Replace getauxval() with getauxptr() when building the tests for purecap. By building the vDSO selftests as purecap binaries, we can test the purecap vDSO. Signed-off-by: Aditya Deshpande <aditya.deshpande(a)arm.com> --- tools/testing/selftests/vDSO/parse_vdso.h | 16 ++++++++++++++++ tools/testing/selftests/vDSO/vdso_test_abi.c | 5 +++-- .../selftests/vDSO/vdso_test_gettimeofday.c | 6 ++---- 3 files changed, 21 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/vDSO/parse_vdso.h b/tools/testing/selftests/vDSO/parse_vdso.h index de0453067d7c..58f3df88160d 100644 --- a/tools/testing/selftests/vDSO/parse_vdso.h +++ b/tools/testing/selftests/vDSO/parse_vdso.h @@ -4,6 +4,7 @@ #define PARSE_VDSO_H #include <stdint.h> +#include <stdlib.h> /* * To use this vDSO parser, first call one of the vdso_init_* functions. @@ -28,4 +29,19 @@ void *vdso_sym(const char *version, const char *name); void vdso_init_from_sysinfo_ehdr(uintptr_t base); void vdso_init_from_auxv(void *auxv); +/* + * Under PCuABI, pointers in the auxiliary vector can no longer be represented + * as unsigned long as they are now capabilities. Get the capability to the + * vDSO using getauxptr() instead, which returns a a capability instead of + * unsigned long. + */ +static inline uintptr_t get_sysinfo_ehdr() +{ +#ifdef __CHERI_PURE_CAPABILITY__ + return getauxptr(AT_SYSINFO_EHDR); +#else + return (uintptr_t)getauxval(AT_SYSINFO_EHDR); +#endif +} + #endif diff --git a/tools/testing/selftests/vDSO/vdso_test_abi.c b/tools/testing/selftests/vDSO/vdso_test_abi.c index 883ca85424bc..091efeaa3172 100644 --- a/tools/testing/selftests/vDSO/vdso_test_abi.c +++ b/tools/testing/selftests/vDSO/vdso_test_abi.c @@ -20,6 +20,7 @@ #include "../kselftest.h" #include "vdso_config.h" +#include "parse_vdso.h" extern void *vdso_sym(const char *version, const char *name); extern void vdso_init_from_sysinfo_ehdr(uintptr_t base); @@ -175,7 +176,7 @@ static inline void vdso_test_clock(clockid_t clock_id) int main(int argc, char **argv) { - unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); + uintptr_t sysinfo_ehdr = get_sysinfo_ehdr(); ksft_print_header(); ksft_set_plan(VDSO_TEST_PLAN); @@ -190,7 +191,7 @@ int main(int argc, char **argv) printf("[vDSO kselftest] VDSO_VERSION: %s\n", version); - vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR)); + vdso_init_from_sysinfo_ehdr(sysinfo_ehdr); vdso_test_gettimeofday(); diff --git a/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c b/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c index e411f287a426..359f881ac574 100644 --- a/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c +++ b/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c @@ -37,14 +37,12 @@ const char *name = "__vdso_gettimeofday"; int main(int argc, char **argv) { - unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); + uintptr_t sysinfo_ehdr = get_sysinfo_ehdr(); if (!sysinfo_ehdr) { printf("AT_SYSINFO_EHDR is not present!\n"); return KSFT_SKIP; } - - vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR)); - + vdso_init_from_sysinfo_ehdr(sysinfo_ehdr); /* Find gettimeofday. */ typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz); gtod_t gtod = (gtod_t)vdso_sym(version, name); -- 2.25.1

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linux-morello November 2023