July 2022 - Linux-kselftest-mirror

[PATCH] selftests/vm: enable running select groups of tests

by Joel Savitz

Add the ability to run one or more groups of vm tests (specified by the environment variable TEST_ITEMS). Preserve existing default behavior of running all tests when TEST_ITEMS is empty or "default". Documentation of test groups is included in the patch as follows: # ./run_vmtests.sh [ -h || --help ] usage: ./tools/testing/selftests/vm/run_vmtests.sh [ -h ] -h: display this message The default behavior is to run all tests. Alternatively, specific groups tests can be run by defining the TEST_ITEMS shell variable with a space-separated string of one or more of the following: - mmap tests for mmap(2) - gup_test tests for gup using gup_test interface - userfaultfd tests for userfaultfd(2) - compaction a test for the patch "Allow compaction of unevictable pages" - mlock tests for mlock(2) - mremap tests for mremap(2) - hugevm tests for very large virtual address space - vmalloc vmalloc smoke tests - hmm hmm smoke tests - madv_populate test memadvise(2) MADV_POPULATE_{READ,WRITE} options - memfd_secret test memfd_secret(2) - process_mrelease test process_mrelease(2) - ksm ksm tests that do not require >=2 NUMA nodes - ksm_numa ksm tests that require >=2 NUMA nodes example: TEST_ITEMS="hmm mmap ksm" ./run_vmtests.sh Signed-off-by: Joel Savitz <jsavitz(a)redhat.com> --- tools/testing/selftests/vm/run_vmtests.sh | 224 +++++++++++++++------- 1 file changed, 150 insertions(+), 74 deletions(-) diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh index 41fce8bea929..d31fc66205f8 100755 --- a/tools/testing/selftests/vm/run_vmtests.sh +++ b/tools/testing/selftests/vm/run_vmtests.sh @@ -1,22 +1,74 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 -#please run as root +# Please run as root # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 mnt=./huge exitcode=0 - -#get huge pagesize and freepages from /proc/meminfo -while read -r name size unit; do - if [ "$name" = "HugePages_Free:" ]; then - freepgs="$size" - fi - if [ "$name" = "Hugepagesize:" ]; then - hpgsize_KB="$size" +nr_tests_ran=0 + +if [ ${1:-0} == "-h" ] || [ ${1:-0} == "--help" ] +then + cat <<EOF +usage: ${BASH_SOURCE[0]:-$0} [ -h ] + -h: display this message + +The default behavior is to run all tests. + +Alternatively, specific groups tests can be run by defining +the TEST_ITEMS shell variable with a space-separated string +of one or more of the following: +- mmap + tests for mmap(2) +- gup_test + tests for gup using gup_test interface +- userfaultfd + tests for userfaultfd(2) +- compaction + a test for the patch "Allow compaction of unevictable pages" +- mlock + tests for mlock(2) +- mremap + tests for mremap(2) +- hugevm + tests for very large virtual address space +- vmalloc + vmalloc smoke tests +- hmm + hmm smoke tests +- madv_populate + test memadvise(2) MADV_POPULATE_{READ,WRITE} options +- memfd_secret + test memfd_secret(2) +- process_mrelease + test process_mrelease(2) +- ksm + ksm tests that do not require >=2 NUMA nodes +- ksm_numa + ksm tests that require >=2 NUMA nodes +example: TEST_ITEMS="hmm mmap ksm" ./run_vmtests.sh +EOF + exit 0 +fi # $1 == -h || $1 == --help + +# default behavior: run all tests +TEST_ITEMS=${TEST_ITEMS:-default} + +echo "Selected test items: ${TEST_ITEMS}" + +test_selected() { + if [ "$TEST_ITEMS" == "default" ]; then + # If no TEST_ITEMS are specified, run all tests + return 0 fi -done < /proc/meminfo + echo ${TEST_ITEMS} | grep ${1} 2>&1 >/dev/null + return ${?} +} + +# Hugepage setup only needed for hugetlb tests +if test_selected "hugetlb"; then # Simple hugetlbfs tests have a hardcoded minimum requirement of # huge pages totaling 256MB (262144KB) in size. The userfaultfd @@ -28,7 +80,17 @@ hpgsize_MB=$((hpgsize_KB / 1024)) half_ufd_size_MB=$((((nr_cpus * hpgsize_MB + 127) / 128) * 128)) needmem_KB=$((half_ufd_size_MB * 2 * 1024)) -#set proper nr_hugepages +# get huge pagesize and freepages from /proc/meminfo +while read -r name size unit; do + if [ "$name" = "HugePages_Free:" ]; then + freepgs="$size" + fi + if [ "$name" = "Hugepagesize:" ]; then + hpgsize_KB="$size" + fi +done < /proc/meminfo + +# set proper nr_hugepages if [ -n "$freepgs" ] && [ -n "$hpgsize_KB" ]; then nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages) needpgs=$((needmem_KB / hpgsize_KB)) @@ -57,126 +119,140 @@ else exit 1 fi -#filter 64bit architectures +fi # test_selected "hugetlb" + +# filter 64bit architectures ARCH64STR="arm64 ia64 mips64 parisc64 ppc64 ppc64le riscv64 s390x sh64 sparc64 x86_64" if [ -z "$ARCH" ]; then ARCH=$(uname -m 2>/dev/null | sed -e 's/aarch64.*/arm64/') fi VADDR64=0 -echo "$ARCH64STR" | grep "$ARCH" && VADDR64=1 +echo "$ARCH64STR" | grep "$ARCH" &>/dev/null && VADDR64=1 # Usage: run_test [test binary] [arbitrary test arguments...] run_test() { - local title="running $*" - local sep=$(echo -n "$title" | tr "[:graph:][:space:]" -) - printf "%s\n%s\n%s\n" "$sep" "$title" "$sep" - - "$@" - local ret=$? - if [ $ret -eq 0 ]; then - echo "[PASS]" - elif [ $ret -eq $ksft_skip ]; then - echo "[SKIP]" - exitcode=$ksft_skip - else - echo "[FAIL]" - exitcode=1 - fi + if test_selected ${CATEGORY}; then + local title="running $*" + local sep=$(echo -n "$title" | tr "[:graph:][:space:]" -) + printf "%s\n%s\n%s\n" "$sep" "$title" "$sep" + + "$@" + local ret=$? + if [ $ret -eq 0 ]; then + echo "[PASS]" + elif [ $ret -eq $ksft_skip ]; then + echo "[SKIP]" + exitcode=$ksft_skip + else + echo "[FAIL]" + exitcode=1 + fi + nr_tests_ran=$((nr_tests_ran + 1)) + fi # test_selected } -mkdir "$mnt" -mount -t hugetlbfs none "$mnt" +# setup only needed for hugetlb tests +if test_selected "hugetlb"; then + mkdir "$mnt" + mount -t hugetlbfs none "$mnt" +fi -run_test ./hugepage-mmap +CATEGORY="hugetlb" run_test ./hugepage-mmap shmmax=$(cat /proc/sys/kernel/shmmax) shmall=$(cat /proc/sys/kernel/shmall) echo 268435456 > /proc/sys/kernel/shmmax echo 4194304 > /proc/sys/kernel/shmall -run_test ./hugepage-shm +CATEGORY="hugetlb" run_test ./hugepage-shm echo "$shmmax" > /proc/sys/kernel/shmmax echo "$shmall" > /proc/sys/kernel/shmall -run_test ./map_hugetlb +CATEGORY="hugetlb" run_test ./map_hugetlb -run_test ./hugepage-mremap "$mnt"/huge_mremap -rm -f "$mnt"/huge_mremap +CATEGORY="hugetlb" run_test ./hugepage-mremap "$mnt"/huge_mremap +test_selected "hugetlb" && rm -f "$mnt"/huge_mremap -run_test ./hugepage-vmemmap +CATEGORY="hugetlb" run_test ./hugepage-vmemmap -run_test ./hugetlb-madvise "$mnt"/madvise-test -rm -f "$mnt"/madvise-test +CATEGORY="hugetlb" run_test ./hugetlb-madvise "$mnt"/madvise-test +test_selected "hugetlb" && rm -f "$mnt"/madvise-test -echo "NOTE: The above hugetlb tests provide minimal coverage. Use" -echo " https://github.com/libhugetlbfs/libhugetlbfs.git for" -echo " hugetlb regression testing." +if test_selected "hugetlb"; then + echo "NOTE: These hugetlb tests provide minimal coverage. Use" + echo " https://github.com/libhugetlbfs/libhugetlbfs.git for" + echo " hugetlb regression testing." +fi -run_test ./map_fixed_noreplace +CATEGORY="mmap" run_test ./map_fixed_noreplace # get_user_pages_fast() benchmark -run_test ./gup_test -u +CATEGORY="gup_test" run_test ./gup_test -u # pin_user_pages_fast() benchmark -run_test ./gup_test -a +CATEGORY="gup_test" run_test ./gup_test -a # Dump pages 0, 19, and 4096, using pin_user_pages: -run_test ./gup_test -ct -F 0x1 0 19 0x1000 +CATEGORY="gup_test" run_test ./gup_test -ct -F 0x1 0 19 0x1000 -run_test ./userfaultfd anon 20 16 +CATEGORY="userfaultfd" run_test ./userfaultfd anon 20 16 # Test requires source and destination huge pages. Size of source # (half_ufd_size_MB) is passed as argument to test. -run_test ./userfaultfd hugetlb "$half_ufd_size_MB" 32 -run_test ./userfaultfd shmem 20 16 - -#cleanup -umount "$mnt" -rm -rf "$mnt" -echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages +CATEGORY="userfaultfd" run_test ./userfaultfd hugetlb "$half_ufd_size_MB" 32 +CATEGORY="userfaultfd" run_test ./userfaultfd shmem 20 16 + +# cleanup (only needed when running hugetlb tests) +if test_selected "hugetlb"; then + umount "$mnt" + rm -rf "$mnt" + echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages +fi -run_test ./compaction_test +CATEGORY="compaction" run_test ./compaction_test -run_test sudo -u nobody ./on-fault-limit +CATEGORY="mlock" run_test sudo -u nobody ./on-fault-limit -run_test ./map_populate +CATEGORY="mmap" run_test ./map_populate -run_test ./mlock-random-test +CATEGORY="mlock" run_test ./mlock-random-test -run_test ./mlock2-tests +CATEGORY="mlock" run_test ./mlock2-tests -run_test ./mrelease_test +CATEGORY="process_mrelease" run_test ./mrelease_test -run_test ./mremap_test +CATEGORY="mremap" run_test ./mremap_test -run_test ./thuge-gen +CATEGORY="hugetlb" run_test ./thuge-gen if [ $VADDR64 -ne 0 ]; then - run_test ./virtual_address_range + CATEGORY="hugevm" run_test ./virtual_address_range # virtual address 128TB switch test - run_test ./va_128TBswitch + CATEGORY="hugevm" run_test ./va_128TBswitch fi # VADDR64 # vmalloc stability smoke test -run_test ./test_vmalloc.sh smoke +CATEGORY="vmalloc" run_test ./test_vmalloc.sh smoke -run_test ./mremap_dontunmap +CATEGORY="mremap" run_test ./mremap_dontunmap -run_test ./test_hmm.sh smoke +CATEGORY="hmm" run_test ./test_hmm.sh smoke # MADV_POPULATE_READ and MADV_POPULATE_WRITE tests -run_test ./madv_populate +CATEGORY="madv_populate" run_test ./madv_populate -run_test ./memfd_secret +CATEGORY="memfd_secret" run_test ./memfd_secret # KSM MADV_MERGEABLE test with 10 identical pages -run_test ./ksm_tests -M -p 10 +CATEGORY="ksm" run_test ./ksm_tests -M -p 10 # KSM unmerge test -run_test ./ksm_tests -U +CATEGORY="ksm" run_test ./ksm_tests -U # KSM test with 10 zero pages and use_zero_pages = 0 -run_test ./ksm_tests -Z -p 10 -z 0 +CATEGORY="ksm" run_test ./ksm_tests -Z -p 10 -z 0 # KSM test with 10 zero pages and use_zero_pages = 1 -run_test ./ksm_tests -Z -p 10 -z 1 +CATEGORY="ksm" run_test ./ksm_tests -Z -p 10 -z 1 # KSM test with 2 NUMA nodes and merge_across_nodes = 1 -run_test ./ksm_tests -N -m 1 +CATEGORY="ksm_numa" run_test ./ksm_tests -N -m 1 # KSM test with 2 NUMA nodes and merge_across_nodes = 0 -run_test ./ksm_tests -N -m 0 +CATEGORY="ksm_numa" run_test ./ksm_tests -N -m 0 + +echo "Ran $nr_tests_ran tests" exit $exitcode -- 2.31.1

1 year, 11 months

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[PATCH v4 0/5] Rework KUnit test execution in modules

by David Gow

This patch series makes two changes to how KUnit test suites are stored and executed: - The .kunit_test_suites section is now used for tests in modules (in lieu of a module_init funciton), as well as for built-in tests. The module loader will now trigger test execution. This frees up the module_init function for other uses. - Instead of storing an array of arrays of suites, have the kunit_test_suite() and kunit_test_suites() macros append to one global (or per-module) list of test suites. This removes a needless layer of indirection, and removes the need to NULL-terminate suite_sets. The upshot of this is that it should now be possible to use the kunit_test_suite() and kunit_test_suites() macros to register test suites even from within modules which otherwise had module_init functions. This was proving to be quite a common issue, resulting in several modules calling into KUnit's private suite execution functions to run their tests (often introducing incompatibilities with the KUnit tooling). This series also fixes the thunderbolt, nitro_enclaves, and sdhci-of-aspeed tests to use kunit_test_suite() now that it works. This is required, as otherwise the first two patches may break these tests entirely. Huge thanks to Jeremy Kerr, who designed and implemented the module loader changes, and to Daniel Latypov for pushing the simplification of the nested arrays in .kunit_test_suites. I've tested this series both with builtin tests on a number of architectures, and with modules on x86_64, and it seems good-to-go to me. More testing (particularly of modules) with more interesting setups never hurts, though! Cheers, -- David Changes since v3: https://lore.kernel.org/linux-kselftest/20220625050838.1618469-1-davidgow@g… - Rebase on top of the TAINT_TEST patch series. This should now apply cleanly on top of the kunit branch: https://lore.kernel.org/linux-kselftest/20220708044847.531566-1-davidgow@go… - Add Brendan's Reviewed/Acked-by tags. Daniel Latypov (1): kunit: flatten kunit_suite*** to kunit_suite** in .kunit_test_suites David Gow (3): thunderbolt: test: Use kunit_test_suite() macro nitro_enclaves: test: Use kunit_test_suite() macro mmc: sdhci-of-aspeed: test: Use kunit_test_suite() macro Jeremy Kerr (1): kunit: unify module and builtin suite definitions drivers/mmc/host/Kconfig | 5 +- drivers/mmc/host/sdhci-of-aspeed-test.c | 8 +- drivers/mmc/host/sdhci-of-aspeed.c | 34 +---- drivers/thunderbolt/Kconfig | 6 +- drivers/thunderbolt/domain.c | 3 - drivers/thunderbolt/tb.h | 8 - drivers/thunderbolt/test.c | 12 +- drivers/virt/nitro_enclaves/Kconfig | 5 +- drivers/virt/nitro_enclaves/ne_misc_dev.c | 27 ---- .../virt/nitro_enclaves/ne_misc_dev_test.c | 5 +- include/kunit/test.h | 62 ++------ include/linux/module.h | 5 + kernel/module/main.c | 6 + lib/kunit/executor.c | 115 ++++---------- lib/kunit/executor_test.c | 144 +++++------------- lib/kunit/test.c | 54 ++++++- 16 files changed, 155 insertions(+), 344 deletions(-) -- 2.37.0.rc0.161.g10f37bed90-goog

1 year, 11 months

2
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[PATCH] module: kunit: Load .kunit_test_suites section when CONFIG_KUNIT=m

by David Gow

The new KUnit module handling has KUnit test suites listed in a .kunit_test_suites section of each module. This should be loaded when the module is, but at the moment this only happens if KUnit is built-in. Also load this when KUnit is enabled as a module: it'll not be usable unless KUnit is loaded, but such modules are likely to depend on KUnit anyway, so it's unlikely to ever be loaded needlessly. Fixes: 3d6e44623841 ("kunit: unify module and builtin suite definitions") Signed-off-by: David Gow <davidgow(a)google.com> --- kernel/module/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/module/main.c b/kernel/module/main.c index 324a770f789c..222a0b7263b6 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -2094,7 +2094,7 @@ static int find_module_sections(struct module *mod, struct load_info *info) sizeof(*mod->static_call_sites), &mod->num_static_call_sites); #endif -#ifdef CONFIG_KUNIT +#if IS_ENABLED(CONFIG_KUNIT) mod->kunit_suites = section_objs(info, ".kunit_test_suites", sizeof(*mod->kunit_suites), &mod->num_kunit_suites); -- 2.37.0.144.g8ac04bfd2-goog

1 year, 11 months

5
10
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[PATCH 0/5] Add process_memwatch syscall

by Muhammad Usama Anjum

Hello, This patch series implements a new syscall, process_memwatch. Currently, only the support to watch soft-dirty PTE bit is added. This syscall is generic to watch the memory of the process. There is enough room to add more operations like this to watch memory in the future. Soft-dirty PTE bit of the memory pages can be viewed by using pagemap procfs file. The soft-dirty PTE bit for the memory in a process can be cleared by writing to the clear_refs file. This series adds features that weren't possible through the Proc FS interface. - There is no atomic get soft-dirty PTE bit status and clear operation possible. - The soft-dirty PTE bit of only a part of memory cannot be cleared. Historically, soft-dirty PTE bit tracking has been used in the CRIU project. The Proc FS interface is enough for that as I think the process is frozen. We have the use case where we need to track the soft-dirty PTE bit for running processes. We need this tracking and clear mechanism of a region of memory while the process is running to emulate the getWriteWatch() syscall of Windows. This syscall is used by games to keep track of dirty pages and keep processing only the dirty pages. This syscall can be used by the CRIU project and other applications which require soft-dirty PTE bit information. As in the current kernel there is no way to clear a part of memory (instead of clearing the Soft-Dirty bits for the entire processi) and get+clear operation cannot be performed atomically, there are other methods to mimic this information entirely in userspace with poor performance: - The mprotect syscall and SIGSEGV handler for bookkeeping - The userfaultfd syscall with the handler for bookkeeping long process_memwatch(int pidfd, unsigned long start, int len, unsigned int flags, void *vec, int vec_len); This syscall can be used by the CRIU project and other applications which require soft-dirty PTE bit information. The following operations are supported in this syscall: - Get the pages that are soft-dirty. - Clear the pages which are soft-dirty. - The optional flag to ignore the VM_SOFTDIRTY and only track per page soft-dirty PTE bit There are two decisions which have been taken about how to get the output from the syscall. - Return offsets of the pages from the start in the vec - Stop execution when vec is filled with dirty pages These two arguments doesn't follow the mincore() philosophy where the output array corresponds to the address range in one to one fashion, hence the output buffer length isn't passed and only a flag is set if the page is present. This makes mincore() easy to use with less control. We are passing the size of the output array and putting return data consecutively which is offset of dirty pages from the start. The user can convert these offsets back into the dirty page addresses easily. Suppose, the user want to get first 10 dirty pages from a total memory of 100 pages. He'll allocate output buffer of size 10 and process_memwatch() syscall will abort after finding the 10 pages. This behaviour is needed to support Windows' getWriteWatch(). The behaviour like mincore() can be achieved by passing output buffer of 100 size. This interface can be used for any desired behaviour. Regards, Muhammad Usama Anjum Muhammad Usama Anjum (5): fs/proc/task_mmu: make functions global to be used in other files mm: Implement process_memwatch syscall mm: wire up process_memwatch syscall for x86 selftests: vm: add process_memwatch syscall tests mm: add process_memwatch syscall documentation Documentation/admin-guide/mm/soft-dirty.rst | 48 +- arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + fs/proc/task_mmu.c | 84 +-- include/linux/mm_inline.h | 99 +++ include/linux/syscalls.h | 3 +- include/uapi/asm-generic/unistd.h | 5 +- include/uapi/linux/memwatch.h | 12 + kernel/sys_ni.c | 1 + mm/Makefile | 2 +- mm/memwatch.c | 285 ++++++++ tools/include/uapi/asm-generic/unistd.h | 5 +- .../arch/x86/entry/syscalls/syscall_64.tbl | 1 + tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 2 + tools/testing/selftests/vm/memwatch_test.c | 635 ++++++++++++++++++ 16 files changed, 1098 insertions(+), 87 deletions(-) create mode 100644 include/uapi/linux/memwatch.h create mode 100644 mm/memwatch.c create mode 100644 tools/testing/selftests/vm/memwatch_test.c -- 2.30.2

1 year, 11 months

4
12
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[PATCH bpf-next v5 0/6] bpf trampoline for arm64

by Xu Kuohai

Add bpf trampoline support for arm64. Most of the logic is the same as x86. Tested on raspberry pi 4b and qemu with KASLR disabled (avoid long jump), result: #9 /1 bpf_cookie/kprobe:OK #9 /2 bpf_cookie/multi_kprobe_link_api:FAIL #9 /3 bpf_cookie/multi_kprobe_attach_api:FAIL #9 /4 bpf_cookie/uprobe:OK #9 /5 bpf_cookie/tracepoint:OK #9 /6 bpf_cookie/perf_event:OK #9 /7 bpf_cookie/trampoline:OK #9 /8 bpf_cookie/lsm:OK #9 bpf_cookie:FAIL #18 /1 bpf_tcp_ca/dctcp:OK #18 /2 bpf_tcp_ca/cubic:OK #18 /3 bpf_tcp_ca/invalid_license:OK #18 /4 bpf_tcp_ca/dctcp_fallback:OK #18 /5 bpf_tcp_ca/rel_setsockopt:OK #18 bpf_tcp_ca:OK #51 /1 dummy_st_ops/dummy_st_ops_attach:OK #51 /2 dummy_st_ops/dummy_init_ret_value:OK #51 /3 dummy_st_ops/dummy_init_ptr_arg:OK #51 /4 dummy_st_ops/dummy_multiple_args:OK #51 dummy_st_ops:OK #55 fentry_fexit:OK #56 fentry_test:OK #57 /1 fexit_bpf2bpf/target_no_callees:OK #57 /2 fexit_bpf2bpf/target_yes_callees:OK #57 /3 fexit_bpf2bpf/func_replace:OK #57 /4 fexit_bpf2bpf/func_replace_verify:OK #57 /5 fexit_bpf2bpf/func_sockmap_update:OK #57 /6 fexit_bpf2bpf/func_replace_return_code:OK #57 /7 fexit_bpf2bpf/func_map_prog_compatibility:OK #57 /8 fexit_bpf2bpf/func_replace_multi:OK #57 /9 fexit_bpf2bpf/fmod_ret_freplace:OK #57 fexit_bpf2bpf:OK #58 fexit_sleep:OK #59 fexit_stress:OK #60 fexit_test:OK #67 get_func_args_test:OK #68 get_func_ip_test:OK #104 modify_return:OK #237 xdp_bpf2bpf:OK bpf_cookie/multi_kprobe_link_api and bpf_cookie/multi_kprobe_attach_api failed due to lack of multi_kprobe on arm64. v5: - As Alexei suggested, remove is_valid_bpf_tramp_flags() v4: https://lore.kernel.org/bpf/20220517071838.3366093-1-xukuohai@huawei.com/ - Run the test cases on raspberry pi 4b - Rebase and add cookie to trampoline - As Steve suggested, move trace_direct_tramp() back to entry-ftrace.S to avoid messing up generic code with architecture specific code - As Jakub suggested, merge patch 4 and patch 5 of v3 to provide full function in one patch - As Mark suggested, add a comment for the use of aarch64_insn_patch_text_nosync() - Do not generate trampoline for long jump to avoid triggering ftrace_bug - Round stack size to multiples of 16B to avoid SPAlignmentFault - Use callee saved register x20 to reduce the use of mov_i64 - Add missing BTI J instructions - Trivial spelling and code style fixes v3: https://lore.kernel.org/bpf/20220424154028.1698685-1-xukuohai@huawei.com/ - Append test results for bpf_tcp_ca, dummy_st_ops, fexit_bpf2bpf, xdp_bpf2bpf - Support to poke bpf progs - Fix return value of arch_prepare_bpf_trampoline() to the total number of bytes instead of number of instructions - Do not check whether CONFIG_DYNAMIC_FTRACE_WITH_REGS is enabled in arch_prepare_bpf_trampoline, since the trampoline may be hooked to a bpf prog - Restrict bpf_arch_text_poke() to poke bpf text only, as kernel functions are poked by ftrace - Rewrite trace_direct_tramp() in inline assembly in trace_selftest.c to avoid messing entry-ftrace.S - isolate arch_ftrace_set_direct_caller() with macro CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS to avoid compile error when this macro is disabled - Some trivial code sytle fixes v2: https://lore.kernel.org/bpf/20220414162220.1985095-1-xukuohai@huawei.com/ - Add Song's ACK - Change the multi-line comment in is_valid_bpf_tramp_flags() into net style (patch 3) - Fix a deadloop issue in ftrace selftest (patch 2) - Replace pt_regs->x0 with pt_regs->orig_x0 in patch 1 commit message - Replace "bpf trampoline" with "custom trampoline" in patch 1, as ftrace direct call is not only used by bpf trampoline. v1: https://lore.kernel.org/bpf/20220413054959.1053668-1-xukuohai@huawei.com/ Xu Kuohai (6): arm64: ftrace: Add ftrace direct call support ftrace: Fix deadloop caused by direct call in ftrace selftest bpf: Remove is_valid_bpf_tramp_flags() bpf, arm64: Impelment bpf_arch_text_poke() for arm64 bpf, arm64: bpf trampoline for arm64 selftests/bpf: Fix trivial typo in fentry_fexit.c arch/arm64/Kconfig | 2 + arch/arm64/include/asm/ftrace.h | 22 + arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kernel/entry-ftrace.S | 28 +- arch/arm64/net/bpf_jit.h | 1 + arch/arm64/net/bpf_jit_comp.c | 523 +++++++++++++++++- arch/x86/net/bpf_jit_comp.c | 20 - kernel/bpf/bpf_struct_ops.c | 3 + kernel/bpf/trampoline.c | 3 + kernel/trace/trace_selftest.c | 2 + .../selftests/bpf/prog_tests/fentry_fexit.c | 4 +- 11 files changed, 570 insertions(+), 39 deletions(-) -- 2.30.2

1 year, 11 months

5
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[PATCH 1/2] KVM: x86: emulator: Fix illegal LEA handling

by Michal Luczaj

The emulator mishandles LEA with register source operand. Even though such LEA is illegal, it can be encoded and fed to CPU. In which case real hardware throws #UD. The emulator, instead, returns address of x86_emulate_ctxt._regs. This info leak hurts host's kASLR. Tell the decoder that illegal LEA is not to be emulated. Signed-off-by: Michal Luczaj <mhal(a)rbox.co> --- What the emulator does for LEA is simply: case 0x8d: /* lea r16/r32, m */ ctxt->dst.val = ctxt->src.addr.mem.ea; break; And it makes sense if you assume that LEA's source operand is always memory. But because there is a race window between VM-exit and the decoder instruction fetch, emulator can be force fed an arbitrary opcode of choice. Including some that are simply illegal and would cause #UD in normal circumstances. Such as a LEA with a register-direct source operand -- for which the emulator sets `op->addr.reg`, but reads `op->addr.mem.ea`. union { unsigned long *reg; struct segmented_address { ulong ea; unsigned seg; } mem; ... } addr; Because `reg` and `mem` are in union, emulator reveals address in host's memory. I hope this patch is not considered an `instr_dual` abuse? arch/x86/kvm/emulate.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index f8382abe22ff..7c14706372d0 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4566,6 +4566,10 @@ static const struct mode_dual mode_dual_63 = { N, I(DstReg | SrcMem32 | ModRM | Mov, em_movsxd) }; +static const struct instr_dual instr_dual_8d = { + D(DstReg | SrcMem | ModRM | NoAccess), N +}; + static const struct opcode opcode_table[256] = { /* 0x00 - 0x07 */ F6ALU(Lock, em_add), @@ -4622,7 +4626,7 @@ static const struct opcode opcode_table[256] = { I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov), I2bv(DstReg | SrcMem | ModRM | Mov, em_mov), I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg), - D(ModRM | SrcMem | NoAccess | DstReg), + ID(0, &instr_dual_8d), I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm), G(0, group1A), /* 0x90 - 0x97 */ -- 2.32.0

1 year, 11 months

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[PATCH] docs/kselftest: Fix build commands in guidelines

by Muhammad Usama Anjum

Build commands start with "make". It is missing. Add "make" to the start of the build command. Fixes: 820636106342 ("docs/kselftest: add more guidelines for adding new tests") Signed-off-by: Muhammad Usama Anjum <usama.anjum(a)collabora.com> --- Documentation/dev-tools/kselftest.rst | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst index ee6467ca8293..9dd94c334f05 100644 --- a/Documentation/dev-tools/kselftest.rst +++ b/Documentation/dev-tools/kselftest.rst @@ -255,9 +255,9 @@ Contributing new tests (details) * All changes should pass:: - kselftest-{all,install,clean,gen_tar} - kselftest-{all,install,clean,gen_tar} O=abo_path - kselftest-{all,install,clean,gen_tar} O=rel_path + make kselftest-{all,install,clean,gen_tar} + make kselftest-{all,install,clean,gen_tar} O=abs_path + make kselftest-{all,install,clean,gen_tar} O=rel_path make -C tools/testing/selftests {all,install,clean,gen_tar} make -C tools/testing/selftests {all,install,clean,gen_tar} O=abs_path make -C tools/testing/selftests {all,install,clean,gen_tar} O=rel_path -- 2.30.2

1 year, 11 months

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[PATCH v2 net-next 0/3] ptp: Add adjust phase to support phase offset.

by vincent.cheng.xh＠renesas.com

From: Vincent Cheng <vincent.cheng.xh(a)renesas.com> This series adds adjust phase to the PTP Hardware Clock device interface. Some PTP hardware clocks have a write phase mode that has a built-in hardware filtering capability. The write phase mode utilizes a phase offset control word instead of a frequency offset control word. Add adjust phase function to take advantage of this capability. Changes since v1: - As suggested by Richard Cochran: 1. ops->adjphase is new so need to check for non-null function pointer. 2. Kernel coding style uses lower_case_underscores. 3. Use existing PTP clock API for delayed worker. Vincent Cheng (3): ptp: Add adjphase function to support phase offset control. ptp: Add adjust_phase to ptp_clock_caps capability. ptp: ptp_clockmatrix: Add adjphase() to support PHC write phase mode. drivers/ptp/ptp_chardev.c | 1 + drivers/ptp/ptp_clock.c | 3 ++ drivers/ptp/ptp_clockmatrix.c | 92 +++++++++++++++++++++++++++++++++++ drivers/ptp/ptp_clockmatrix.h | 8 ++- include/linux/ptp_clock_kernel.h | 6 ++- include/uapi/linux/ptp_clock.h | 4 +- tools/testing/selftests/ptp/testptp.c | 6 ++- 7 files changed, 114 insertions(+), 6 deletions(-) -- 2.7.4

1 year, 11 months

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[PATCH] mmc: sdhci-of-aspeed: test: Fix dependencies when KUNIT=m

by David Gow

While the sdhci-of-aspeed KUnit tests do work when builtin, and do work when KUnit itself is being built as a module, the two together break. This is because the KUnit tests (understandably) depend on KUnit, so a built-in test cannot build if KUnit is a module. Fix this by adding a dependency on (MMC_SDHCI_OF_ASPEED=m || KUNIT=y), which only excludes this one problematic configuration. This was reported on a nasty openrisc-randconfig run by the kernel test robot, though for some reason (compiler optimisations removing the test code?) I wasn't able to reproduce it locally on x86: https://lore.kernel.org/linux-mm/202207140122.fzhlf60k-lkp@intel.com/T/ Fixes: 291cd54e5b05 ("mmc: sdhci-of-aspeed: test: Use kunit_test_suite() macro") Reported-by: kernel test robot <lkp(a)intel.com> Signed-off-by: David Gow <davidgow(a)google.com> --- drivers/mmc/host/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 10c563999d3d..e63608834411 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -171,6 +171,7 @@ config MMC_SDHCI_OF_ASPEED config MMC_SDHCI_OF_ASPEED_TEST bool "Tests for the ASPEED SDHCI driver" if !KUNIT_ALL_TESTS depends on MMC_SDHCI_OF_ASPEED && KUNIT + depends on (MMC_SDHCI_OF_ASPEED=m || KUNIT=y) default KUNIT_ALL_TESTS help Enable KUnit tests for the ASPEED SDHCI driver. Select this -- 2.37.0.170.g444d1eabd0-goog

1 year, 11 months

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[PATCH v3 0/4] Introduce security_create_user_ns()

by Frederick Lawler

While creating a LSM BPF MAC policy to block user namespace creation, we used the LSM cred_prepare hook because that is the closest hook to prevent a call to create_user_ns(). The calls look something like this: cred = prepare_creds() security_prepare_creds() call_int_hook(cred_prepare, ... if (cred) create_user_ns(cred) We noticed that error codes were not propagated from this hook and introduced a patch [1] to propagate those errors. The discussion notes that security_prepare_creds() is not appropriate for MAC policies, and instead the hook is meant for LSM authors to prepare credentials for mutation. [2] Ultimately, we concluded that a better course of action is to introduce a new security hook for LSM authors. [3] This patch set first introduces a new security_create_user_ns() function and userns_create LSM hook, then marks the hook as sleepable in BPF. Links: 1. https://lore.kernel.org/all/20220608150942.776446-1-fred@cloudflare.com/ 2. https://lore.kernel.org/all/87y1xzyhub.fsf@email.froward.int.ebiederm.org/ 3. https://lore.kernel.org/all/9fe9cd9f-1ded-a179-8ded-5fde8960a586@cloudflare… Past discussions: V2: https://lore.kernel.org/all/20220707223228.1940249-1-fred@cloudflare.com/ V1: https://lore.kernel.org/all/20220621233939.993579-1-fred@cloudflare.com/ Changes since v2: - Rename create_user_ns hook to userns_create - Use user_namespace as an object opposed to a generic namespace object - s/domB_t/domA_t in commit message Changes since v1: - Add selftests/bpf: Add tests verifying bpf lsm create_user_ns hook patch - Add selinux: Implement create_user_ns hook patch - Change function signature of security_create_user_ns() to only take struct cred - Move security_create_user_ns() call after id mapping check in create_user_ns() - Update documentation to reflect changes Frederick Lawler (4): security, lsm: Introduce security_create_user_ns() bpf-lsm: Make bpf_lsm_userns_create() sleepable selftests/bpf: Add tests verifying bpf lsm userns_create hook selinux: Implement userns_create hook include/linux/lsm_hook_defs.h | 1 + include/linux/lsm_hooks.h | 4 + include/linux/security.h | 6 ++ kernel/bpf/bpf_lsm.c | 1 + kernel/user_namespace.c | 5 ++ security/security.c | 5 ++ security/selinux/hooks.c | 9 ++ security/selinux/include/classmap.h | 2 + .../selftests/bpf/prog_tests/deny_namespace.c | 88 +++++++++++++++++++ .../selftests/bpf/progs/test_deny_namespace.c | 39 ++++++++ 10 files changed, 160 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/deny_namespace.c create mode 100644 tools/testing/selftests/bpf/progs/test_deny_namespace.c -- 2.30.2

1 year, 11 months

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Linux-kselftest-mirror July 2022