- Linux-kselftest-mirror - lists.linaro.org

[RESEND][PATCH 0/6] Add _opts variant for bpf_*_get_fd_by_id()

by Roberto Sassu

From: Roberto Sassu <roberto.sassu(a)huawei.com> NOTE: resending with libbpf_get_fd_opts test added to deny list for s390x. Add the _opts variant for bpf_*_get_fd_by_id() functions, to be able to pass to the kernel more options, when requesting a fd of an eBPF object to the kernel. Pass the options through a newly introduced structure, bpf_get_fd_opts, which currently contains open_flags (the other two members are for compatibility and for padding). open_flags allows the caller to request specific permissions to access a map (e.g. read-only). This is useful for example in the situation where a map is write-protected. Besides patches 2-6, which introduce the new variants and the data structure, patch 1 fixes the LIBBPF_1.0.0 declaration in libbpf.map. Roberto Sassu (6): libbpf: Fix LIBBPF_1.0.0 declaration in libbpf.map libbpf: Define bpf_get_fd_opts and introduce bpf_map_get_fd_by_id_opts() libbpf: Introduce bpf_prog_get_fd_by_id_opts() libbpf: Introduce bpf_btf_get_fd_by_id_opts() libbpf: Introduce bpf_link_get_fd_by_id_opts() selftests/bpf: Add tests for _opts variants of bpf_*_get_fd_by_id() tools/lib/bpf/bpf.c | 47 +++++++++- tools/lib/bpf/bpf.h | 16 ++++ tools/lib/bpf/libbpf.map | 6 +- tools/testing/selftests/bpf/DENYLIST.s390x | 1 + .../bpf/prog_tests/libbpf_get_fd_opts.c | 88 +++++++++++++++++++ .../bpf/progs/test_libbpf_get_fd_opts.c | 36 ++++++++ 6 files changed, 189 insertions(+), 5 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/libbpf_get_fd_opts.c create mode 100644 tools/testing/selftests/bpf/progs/test_libbpf_get_fd_opts.c -- 2.25.1

2 years, 4 months

2
11
0 0

[PATCH v3 2/3] selftests/x86/mxcsr: Test the MXCSR state write via ptrace

by Chang S. Bae

The ptrace buffer is in the non-compacted format. The MXCSR state should be written to the target thread when either SSE or AVX component is enabled. Write an MXCSR value to the target and read back. Then it is validated with the XRSTOR/XSAVE result on the current. Signed-off-by: Chang S. Bae <chang.seok.bae(a)intel.com> Cc: x86(a)kernel.org Cc: linux-kernel(a)vger.kernel.org Cc: linux-kselftest(a)vger.kernel.org --- If this is acceptable, I will also follow up to move some of the helper functions to a .h file from this and other test cases because duplicating what is shareable should be avoided. --- tools/testing/selftests/x86/Makefile | 2 +- tools/testing/selftests/x86/mxcsr.c | 200 +++++++++++++++++++++++++++ 2 files changed, 201 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/x86/mxcsr.c diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile index 0388c4d60af0..621c47960be3 100644 --- a/tools/testing/selftests/x86/Makefile +++ b/tools/testing/selftests/x86/Makefile @@ -13,7 +13,7 @@ CAN_BUILD_WITH_NOPIE := $(shell ./check_cc.sh "$(CC)" trivial_program.c -no-pie) TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt test_mremap_vdso \ check_initial_reg_state sigreturn iopl ioperm \ test_vsyscall mov_ss_trap \ - syscall_arg_fault fsgsbase_restore sigaltstack + syscall_arg_fault fsgsbase_restore sigaltstack mxcsr TARGETS_C_32BIT_ONLY := entry_from_vm86 test_syscall_vdso unwind_vdso \ test_FCMOV test_FCOMI test_FISTTP \ vdso_restorer diff --git a/tools/testing/selftests/x86/mxcsr.c b/tools/testing/selftests/x86/mxcsr.c new file mode 100644 index 000000000000..7c318c48b4be --- /dev/null +++ b/tools/testing/selftests/x86/mxcsr.c @@ -0,0 +1,200 @@ +// SPDX-License-Identifier: GPL-2.0 + +#define _GNU_SOURCE +#include <err.h> +#include <elf.h> +#include <stdbool.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <x86intrin.h> + +#include <sys/ptrace.h> +#include <sys/syscall.h> +#include <sys/wait.h> +#include <sys/uio.h> + +#include "../kselftest.h" /* For __cpuid_count() */ + +#define LEGACY_STATE_SIZE 24 +#define MXCSR_SIZE 8 +#define STSTATE_SIZE 8*16 +#define XMM_SIZE 16*16 +#define PADDING_SIZE 96 +#define XSAVE_HDR_SIZE 64 + +struct xsave_buffer { + uint8_t legacy_state[LEGACY_STATE_SIZE]; + uint8_t mxcsr[MXCSR_SIZE]; + uint8_t st_state[STSTATE_SIZE]; + uint8_t xmm_state[XMM_SIZE]; + uint8_t padding[PADDING_SIZE]; + uint8_t header[XSAVE_HDR_SIZE]; + uint8_t extended[0]; +}; + +#ifdef __x86_64__ +#define REX_PREFIX "0x48, " +#else +#define REX_PREFIX +#endif + +#define XSAVE ".byte " REX_PREFIX "0x0f,0xae,0x27" +#define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f" + +static inline uint64_t xgetbv(uint32_t index) +{ + uint32_t eax, edx; + + asm volatile("xgetbv" + : "=a" (eax), "=d" (edx) + : "c" (index)); + return eax + ((uint64_t)edx << 32); +} + +static inline void xsave(struct xsave_buffer *xbuf, uint64_t rfbm) +{ + uint32_t rfbm_lo = rfbm; + uint32_t rfbm_hi = rfbm >> 32; + + asm volatile(XSAVE :: "D" (xbuf), "a" (rfbm_lo), "d" (rfbm_hi) : "memory"); +} + +static inline void xrstor(struct xsave_buffer *xbuf, uint64_t rfbm) +{ + uint32_t rfbm_lo = rfbm; + uint32_t rfbm_hi = rfbm >> 32; + + asm volatile(XRSTOR :: "D" (xbuf), "a" (rfbm_lo), "d" (rfbm_hi)); +} + +static inline void clear_xstate_header(struct xsave_buffer *xbuf) +{ + memset(&xbuf->header, 0, sizeof(xbuf->header)); +} + +static inline uint32_t get_mxcsr(struct xsave_buffer *xbuf) +{ + return *((uint32_t *)xbuf->mxcsr); +} + +static inline void set_mxcsr(struct xsave_buffer *xbuf, uint32_t val) +{ + *((uint32_t *)xbuf->mxcsr) = val; +} + +#define XFEATURE_MASK_SSE 0x2 +#define XFEATURE_MASK_YMM 0x4 + +#define CPUID_LEAF1_ECX_XSAVE_MASK (1 << 26) +#define CPUID_LEAF1_ECX_OSXSAVE_MASK (1 << 27) +#define CPUID_LEAF_XSTATE 0xd +#define CPUID_SUBLEAF_XSTATE_USER 0x0 +#define CPUID_SUBLEAF_XSTATE_EXT 0x1 + +static bool xsave_availability(void) +{ + uint32_t eax, ebx, ecx, edx; + + __cpuid_count(1, 0, eax, ebx, ecx, edx); + if (!(ecx & CPUID_LEAF1_ECX_XSAVE_MASK)) + return false; + if (!(ecx & CPUID_LEAF1_ECX_OSXSAVE_MASK)) + return false; + return true; +} + +static uint32_t get_xbuf_size(void) +{ + uint32_t eax, ebx, ecx, edx; + + __cpuid_count(CPUID_LEAF_XSTATE, CPUID_SUBLEAF_XSTATE_USER, + eax, ebx, ecx, edx); + return ebx; +} + +static void ptrace_get(pid_t pid, struct iovec *iov) +{ + memset(iov->iov_base, 0, iov->iov_len); + + if (ptrace(PTRACE_GETREGSET, pid, (uint32_t)NT_X86_XSTATE, iov)) + err(1, "TRACE_GETREGSET"); +} + +static void ptrace_set(pid_t pid, struct iovec *iov) +{ + if (ptrace(PTRACE_SETREGSET, pid, (uint32_t)NT_X86_XSTATE, iov)) + err(1, "TRACE_SETREGSET"); +} + +int main(void) +{ + struct xsave_buffer *xbuf; + uint32_t xbuf_size; + struct iovec iov; + uint32_t mxcsr; + pid_t child; + int status; + + if (!xsave_availability()) + printf("[SKIP]\tSkip as XSAVE not available.\n"); + + xbuf_size = get_xbuf_size(); + if (!xbuf_size) + printf("[SKIP]\tSkip as XSAVE not available.\n"); + + if (!(xgetbv(0) & (XFEATURE_MASK_SSE | XFEATURE_MASK_YMM))) + printf("[SKIP]\tSkip as SSE state not available.\n"); + + xbuf = aligned_alloc(64, xbuf_size); + if (!xbuf) + err(1, "aligned_alloc()"); + + iov.iov_base = xbuf; + iov.iov_len = xbuf_size; + + child = fork(); + if (child < 0) { + err(1, "fork()"); + } else if (!child) { + if (ptrace(PTRACE_TRACEME, 0, NULL, NULL)) + err(1, "PTRACE_TRACEME"); + + raise(SIGTRAP); + _exit(0); + } + + wait(&status); + + if (WSTOPSIG(status) != SIGTRAP) + err(1, "raise(SIGTRAP)"); + + printf("[RUN]\tTest the MXCSR state write via ptrace().\n"); + + /* Set a benign value */ + set_mxcsr(xbuf, 0xabc); + /* The MXCSR state should be loaded regardless of XSTATE_BV */ + clear_xstate_header(xbuf); + + /* Write the MXCSR state both locally and remotely. */ + xrstor(xbuf, XFEATURE_MASK_SSE); + ptrace_set(child, &iov); + + /* Read the MXCSR state back for both */ + xsave(xbuf, XFEATURE_MASK_SSE); + mxcsr = get_mxcsr(xbuf); + ptrace_get(child, &iov); + + /* Cross-check with each other */ + if (mxcsr == get_mxcsr(xbuf)) + printf("[OK]\tThe written state was read back correctly.\n"); + else + printf("[FAIL]\tThe write (or read) was incorrect.\n"); + + ptrace(PTRACE_DETACH, child, NULL, NULL); + wait(&status); + if (!WIFEXITED(status) || WEXITSTATUS(status)) + err(1, "PTRACE_DETACH"); + + free(xbuf); +} -- 2.17.1

2 years, 4 months

1
0
0 0

[PATCH v2 0/4] Some improvements of resctrl selftest

by Shaopeng Tan

Hello, The aim of this patch series is to improve the resctrl selftest. Without these fixes, some unnecessary processing will be executed and test results will be confusing. There is no behavior change in test themselves. [patch 1] Make write_schemata() run to set up shemata with 100% allocation on first run in MBM test. [patch 2] The MBA test result message is always output as "ok", make output message to be "not ok" if MBA check result is failed. [patch 3] Before exiting each test CMT/CAT/MBM/MBA, clear test result files function cat/cmt/mbm/mba_test_cleanup() are called twice. Delete once. [patch 4] When a child process is created by fork(), the buffer of the parent process is also copied. Flush the buffer before executing fork(). This patch series is based on Linux v6.0-rc7 Difference from v1: [patch 1] Make write_schemata() always be called, and use resctrl_val_param->num_of_runs instead of static num_of_runs. [patch 2] Add Reviewed-by tag. [patch 3] Remove cat/cmt/mbm/mba_test_cleanup() from run_cmt/mbm/mba_test() and modify changelog. [patch 4] Add Reviewed-by tag. Notice that I dropped the one patch from v1 in this series ("[PATCH 4/5] selftests/resctrl: Kill the child process before exiting the parent process if an exception occurs"). This is because the bug will take some time to fix, I will submit it separately in the future. Shaopeng Tan (4): selftests/resctrl: Fix set up shemata with 100% allocation on first run in MBM test. selftests/resctrl: Return MBA check result and make it to output message selftests/resctrl: Remove duplicate codes that clear each test result file selftests/resctrl: Flush stdout file buffer before executing fork() tools/testing/selftests/resctrl/cat_test.c | 1 + tools/testing/selftests/resctrl/mba_test.c | 8 ++++---- tools/testing/selftests/resctrl/mbm_test.c | 6 +++--- tools/testing/selftests/resctrl/resctrl_tests.c | 4 ---- tools/testing/selftests/resctrl/resctrl_val.c | 1 + tools/testing/selftests/resctrl/resctrlfs.c | 1 + 6 files changed, 10 insertions(+), 11 deletions(-) -- 2.27.0

2 years, 4 months

2
6
0 0

[PATCH] kunit: tool: Don't download risc-v opensbi firmware with wget

by David Gow

When running a RISC-V test kernel under QEMU, we need an OpenSBI BIOS file. In the original QEMU support patchset, kunit_tool would optionally download this file from GitHub if it didn't exist, using wget. These days, it can usually be found in the distro's qemu-system-riscv package, and is located in /usr/share/qemu on all the distros I tried (Debian, Arch, OpenSUSE). Use this file, and thereby don't do any downloading in kunit_tool. In addition, we used to shell out to whatever 'wget' was in the path, which could have potentially been used to trick the developer into running another binary. By not using wget at all, we nicely sidestep this issue. Cc: Xu Panda <xu.panda(a)zte.com.cn> Fixes: 87c9c1631788 ("kunit: tool: add support for QEMU") Reported-by: Zeal Robot <zealci(a)zte.com.cn> Signed-off-by: David Gow <davidgow(a)google.com> --- This is a replacement for "kunit: tool: use absolute path for wget": https://lore.kernel.org/linux-kselftest/20220922083610.235936-1-xu.panda@zt… Instead of just changing the path to wget, it removes the download option completely and grabs the opensbi-riscv64-generic-fw_dynamic.bin from the /usr/share/qemu directory, where the distro package manager should have put it. I _think_ this should be okay to treat as a fix: we were always grabbing this from the QEMU GitHub repository, so it should be widely available. And if you want to treat the wget use as a security issue, getting rid of it everywhere would be nice. Thoughts? -- David --- tools/testing/kunit/qemu_configs/riscv.py | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/tools/testing/kunit/qemu_configs/riscv.py b/tools/testing/kunit/qemu_configs/riscv.py index 6207be146d26..12a1d525978a 100644 --- a/tools/testing/kunit/qemu_configs/riscv.py +++ b/tools/testing/kunit/qemu_configs/riscv.py @@ -3,17 +3,13 @@ import os import os.path import sys -GITHUB_OPENSBI_URL = 'https://github.com/qemu/qemu/raw/master/pc-bios/opensbi-riscv64-generic-fw_…' -OPENSBI_FILE = os.path.basename(GITHUB_OPENSBI_URL) +OPENSBI_FILE = 'opensbi-riscv64-generic-fw_dynamic.bin' +OPENSBI_PATH = '/usr/share/qemu/' + OPENSBI_FILE -if not os.path.isfile(OPENSBI_FILE): - print('\n\nOpenSBI file is not in the current working directory.\n' - 'Would you like me to download it for you from:\n' + GITHUB_OPENSBI_URL + ' ?\n') - response = input('yes/[no]: ') - if response.strip() == 'yes': - os.system('wget ' + GITHUB_OPENSBI_URL) - else: - sys.exit() +if not os.path.isfile(OPENSBI_PATH): + print('\n\nOpenSBI bios was not found in "' + OPENSBI_PATH + '".\n' + 'Please ensure that qemu-system-riscv is installed, or edit the path in "qemu_configs/riscv.py"\n') + sys.exit() QEMU_ARCH = QemuArchParams(linux_arch='riscv', kconfig=''' @@ -29,4 +25,4 @@ CONFIG_SERIAL_EARLYCON_RISCV_SBI=y''', extra_qemu_params=[ '-machine', 'virt', '-cpu', 'rv64', - '-bios', 'opensbi-riscv64-generic-fw_dynamic.bin']) + '-bios', OPENSBI_PATH]) -- 2.37.3.998.g577e59143f-goog

2 years, 4 months

3
2
0 0

[PATCH v2 1/5] kunit: string-stream: Simplify resource use

by Daniel Latypov

From: David Gow <davidgow(a)google.com> Currently, KUnit's string streams are themselves "KUnit resources". This is redundant since the stream itself is already allocated with kunit_kzalloc() and will thus be freed automatically at the end of the test. string-stream is only used internally within KUnit, and isn't using the extra features that resources provide like reference counting, being able to locate them dynamically as "test-local variables", etc. Indeed, the resource's refcount is never incremented when the pointer is returned. The fact that it's always manually destroyed is more evidence that the reference counting is unused. Signed-off-by: David Gow <davidgow(a)google.com> Signed-off-by: Daniel Latypov <dlatypov(a)google.com> --- v1 -> v2: no changes --- lib/kunit/string-stream.c | 90 +++++++-------------------------------- lib/kunit/string-stream.h | 2 +- lib/kunit/test.c | 2 +- 3 files changed, 18 insertions(+), 76 deletions(-) diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c index 141789ca8949..a2496abef152 100644 --- a/lib/kunit/string-stream.c +++ b/lib/kunit/string-stream.c @@ -12,64 +12,31 @@ #include "string-stream.h" -struct string_stream_fragment_alloc_context { - struct kunit *test; - int len; - gfp_t gfp; -}; -static int string_stream_fragment_init(struct kunit_resource *res, - void *context) +static struct string_stream_fragment *alloc_string_stream_fragment( + struct kunit *test, int len, gfp_t gfp) { - struct string_stream_fragment_alloc_context *ctx = context; struct string_stream_fragment *frag; - frag = kunit_kzalloc(ctx->test, sizeof(*frag), ctx->gfp); + frag = kunit_kzalloc(test, sizeof(*frag), gfp); if (!frag) - return -ENOMEM; + return ERR_PTR(-ENOMEM); - frag->test = ctx->test; - frag->fragment = kunit_kmalloc(ctx->test, ctx->len, ctx->gfp); + frag->test = test; + frag->fragment = kunit_kmalloc(test, len, gfp); if (!frag->fragment) - return -ENOMEM; + return ERR_PTR(-ENOMEM); - res->data = frag; - - return 0; + return frag; } -static void string_stream_fragment_free(struct kunit_resource *res) +static void string_stream_fragment_destroy(struct string_stream_fragment *frag) { - struct string_stream_fragment *frag = res->data; - list_del(&frag->node); kunit_kfree(frag->test, frag->fragment); kunit_kfree(frag->test, frag); } -static struct string_stream_fragment *alloc_string_stream_fragment( - struct kunit *test, int len, gfp_t gfp) -{ - struct string_stream_fragment_alloc_context context = { - .test = test, - .len = len, - .gfp = gfp - }; - - return kunit_alloc_resource(test, - string_stream_fragment_init, - string_stream_fragment_free, - gfp, - &context); -} - -static int string_stream_fragment_destroy(struct string_stream_fragment *frag) -{ - return kunit_destroy_resource(frag->test, - kunit_resource_instance_match, - frag); -} - int string_stream_vadd(struct string_stream *stream, const char *fmt, va_list args) @@ -169,48 +136,23 @@ struct string_stream_alloc_context { gfp_t gfp; }; -static int string_stream_init(struct kunit_resource *res, void *context) +struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp) { struct string_stream *stream; - struct string_stream_alloc_context *ctx = context; - stream = kunit_kzalloc(ctx->test, sizeof(*stream), ctx->gfp); + stream = kunit_kzalloc(test, sizeof(*stream), gfp); if (!stream) - return -ENOMEM; + return ERR_PTR(-ENOMEM); - res->data = stream; - stream->gfp = ctx->gfp; - stream->test = ctx->test; + stream->gfp = gfp; + stream->test = test; INIT_LIST_HEAD(&stream->fragments); spin_lock_init(&stream->lock); - return 0; + return stream; } -static void string_stream_free(struct kunit_resource *res) +void string_stream_destroy(struct string_stream *stream) { - struct string_stream *stream = res->data; - string_stream_clear(stream); } - -struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp) -{ - struct string_stream_alloc_context context = { - .test = test, - .gfp = gfp - }; - - return kunit_alloc_resource(test, - string_stream_init, - string_stream_free, - gfp, - &context); -} - -int string_stream_destroy(struct string_stream *stream) -{ - return kunit_destroy_resource(stream->test, - kunit_resource_instance_match, - stream); -} diff --git a/lib/kunit/string-stream.h b/lib/kunit/string-stream.h index 43f9508a55b4..494dee0f24bd 100644 --- a/lib/kunit/string-stream.h +++ b/lib/kunit/string-stream.h @@ -46,6 +46,6 @@ int string_stream_append(struct string_stream *stream, bool string_stream_is_empty(struct string_stream *stream); -int string_stream_destroy(struct string_stream *stream); +void string_stream_destroy(struct string_stream *stream); #endif /* _KUNIT_STRING_STREAM_H */ diff --git a/lib/kunit/test.c b/lib/kunit/test.c index b73d5bb5c473..0fb2771ca03e 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -267,7 +267,7 @@ static void kunit_fail(struct kunit *test, const struct kunit_loc *loc, kunit_print_string_stream(test, stream); - WARN_ON(string_stream_destroy(stream)); + string_stream_destroy(stream); } static void __noreturn kunit_abort(struct kunit *test) base-commit: 94681e289bf5d10c9db9db143d1a22d8717205c5 -- 2.37.1.359.gd136c6c3e2-goog

2 years, 4 months

3
10
0 0

[PATCH v1 0/9] KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg

by Janis Schoetterl-Glausch

User space can use the MEM_OP ioctl to make storage key checked reads and writes to the guest, however, it has no way of performing atomic, key checked, accesses to the guest. Extend the MEM_OP ioctl in order to allow for this, by adding a cmpxchg mode. For now, support this mode for absolute accesses only. This mode can be use, for example, to set the device-state-change indicator and the adapter-local-summary indicator atomically. Janis Schoetterl-Glausch (9): s390/uaccess: Add storage key checked cmpxchg access to user space KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg Documentation: KVM: s390: Describe KVM_S390_MEMOP_F_CMPXCHG KVM: s390: selftest: memop: Pass mop_desc via pointer KVM: s390: selftest: memop: Replace macros by functions KVM: s390: selftest: memop: Add bad address test KVM: s390: selftest: memop: Add cmpxchg tests KVM: s390: selftest: memop: Fix typo KVM: s390: selftest: memop: Fix wrong address being used in test Documentation/virt/kvm/api.rst | 18 +- include/uapi/linux/kvm.h | 5 + arch/s390/include/asm/uaccess.h | 187 ++++++ arch/s390/kvm/gaccess.h | 4 + arch/s390/kvm/gaccess.c | 56 ++ arch/s390/kvm/kvm-s390.c | 50 +- tools/testing/selftests/kvm/s390x/memop.c | 704 +++++++++++++++++----- 7 files changed, 874 insertions(+), 150 deletions(-) base-commit: f76349cf41451c5c42a99f18a9163377e4b364ff -- 2.34.1

2 years, 4 months

5
21
0 0

[PATCH RESEND] selftests/ftrace: func_event_triggers: fix typo in user message

by Randy Dunlap

Correct typo of "it's" to "it". Signed-off-by: Randy Dunlap <rdunlap(a)infradead.org> Cc: Steven Rostedt <rostedt(a)goodmis.org> Cc: Ingo Molnar <mingo(a)redhat.com> Cc: Shuah Khan <shuah(a)kernel.org> Cc: linux-kselftest(a)vger.kernel.org --- tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- linux-next-20211224.orig/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc +++ linux-next-20211224/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc @@ -85,7 +85,7 @@ run_enable_disable() { echo $check_disable > $EVENT_ENABLE done sleep $SLEEP_TIME - echo " make sure it's still works" + echo " make sure it still works" test_event_enabled $check_enable_star reset_ftrace_filter

2 years, 4 months

2
1
0 0

[PATCH 0/6] Add _opts variant for bpf_*_get_fd_by_id()

by Roberto Sassu

From: Roberto Sassu <roberto.sassu(a)huawei.com> Add the _opts variant for bpf_*_get_fd_by_id() functions, to be able to pass to the kernel more options, when requesting a fd of an eBPF object to the kernel. Pass the options through a newly introduced structure, bpf_get_fd_opts, which currently contains open_flags (the other two members are for compatibility and for padding). open_flags allows the caller to request specific permissions to access a map (e.g. read-only). This is useful for example in the situation where a map is write-protected. Besides patches 2-6, which introduce the new variants and the data structure, patch 1 fixes the LIBBPF_1.0.0 declaration in libbpf.map. Roberto Sassu (6): libbpf: Fix LIBBPF_1.0.0 declaration in libbpf.map libbpf: Define bpf_get_fd_opts and introduce bpf_map_get_fd_by_id_opts() libbpf: Introduce bpf_prog_get_fd_by_id_opts() libbpf: Introduce bpf_btf_get_fd_by_id_opts() libbpf: Introduce bpf_link_get_fd_by_id_opts() selftests/bpf: Add tests for _opts variants of bpf_*_get_fd_by_id() tools/lib/bpf/bpf.c | 47 +++++++++- tools/lib/bpf/bpf.h | 16 ++++ tools/lib/bpf/libbpf.map | 6 +- .../bpf/prog_tests/libbpf_get_fd_opts.c | 88 +++++++++++++++++++ .../bpf/progs/test_libbpf_get_fd_opts.c | 36 ++++++++ 5 files changed, 188 insertions(+), 5 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/libbpf_get_fd_opts.c create mode 100644 tools/testing/selftests/bpf/progs/test_libbpf_get_fd_opts.c -- 2.25.1

2 years, 4 months

1
6
0 0

Hi

by Ann Ghallagher

Hi Dear, Nice to meet you, hope you’re enjoying a blissful day? I'm Ann Ghallagher. I'm a U.S. Army officer from the United States of America, I am supportive and caring, I like swimming and cooking am gentle although I am a soldier but I'm kind, wanting to get a good friend, I would like to establish mutual friendship with you.I want to make a deal with you so if you are interested contact my email (annghallaghe(a)gmail.com) or should I tell you about the deal here? Regards, Ann

2 years, 4 months

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[PATCH v6 1/2] x86/fpu: Allow PKRU to be (once again) written by ptrace.

by Kyle Huey

From: Kyle Huey <me(a)kylehuey.com> When management of the PKRU register was moved away from XSTATE, emulation of PKRU's existence in XSTATE was added for reading PKRU through ptrace, but not for writing PKRU through ptrace. This can be seen by running gdb and executing `p $pkru`, `set $pkru = 42`, and `p $pkru`. On affected kernels (5.14+) the write to the PKRU register (which gdb performs through ptrace) is ignored. There are three APIs that write PKRU: sigreturn, PTRACE_SETREGSET with NT_X86_XSTATE, and KVM_SET_XSAVE. sigreturn still uses XRSTOR to write to PKRU. KVM_SET_XSAVE has its own special handling to make PKRU writes take effect (in fpu_copy_uabi_to_guest_fpstate). Push that down into copy_uabi_to_xstate and have PTRACE_SETREGSET with NT_X86_XSTATE pass in a pointer to the appropriate PKRU slot. copy_sigframe_from_user_to_xstate depends on copy_uabi_to_xstate populating the PKRU field in the task's XSTATE so that __fpu_restore_sig can do a XRSTOR from it, so continue doing that. This also adds code to initialize the PKRU value to the hardware init value (namely 0) if the PKRU bit is not set in the XSTATE header provided to ptrace, to match XRSTOR. Fixes: e84ba47e313d ("x86/fpu: Hook up PKRU into ptrace()") Signed-off-by: Kyle Huey <me(a)kylehuey.com> Cc: Dave Hansen <dave.hansen(a)linux.intel.com> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: Borislav Petkov <bp(a)suse.de> Cc: stable(a)vger.kernel.org # 5.14+ --- arch/x86/kernel/fpu/core.c | 20 +++++++++----------- arch/x86/kernel/fpu/regset.c | 2 +- arch/x86/kernel/fpu/signal.c | 2 +- arch/x86/kernel/fpu/xstate.c | 25 ++++++++++++++++++++----- arch/x86/kernel/fpu/xstate.h | 4 ++-- 5 files changed, 33 insertions(+), 20 deletions(-) diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 3b28c5b25e12..c273669e8a00 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -391,8 +391,6 @@ int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, { struct fpstate *kstate = gfpu->fpstate; const union fpregs_state *ustate = buf; - struct pkru_state *xpkru; - int ret; if (!cpu_feature_enabled(X86_FEATURE_XSAVE)) { if (ustate->xsave.header.xfeatures & ~XFEATURE_MASK_FPSSE) @@ -406,16 +404,16 @@ int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, if (ustate->xsave.header.xfeatures & ~xcr0) return -EINVAL; - ret = copy_uabi_from_kernel_to_xstate(kstate, ustate); - if (ret) - return ret; + /* + * Nullify @vpkru to preserve its current value if PKRU's bit isn't set + * in the header. KVM's odd ABI is to leave PKRU untouched in this + * case (all other components are eventually re-initialized). + * (Not clear that this is actually necessary for compat). + */ + if (!(ustate->xsave.header.xfeatures & XFEATURE_MASK_PKRU)) + vpkru = NULL; - /* Retrieve PKRU if not in init state */ - if (kstate->regs.xsave.header.xfeatures & XFEATURE_MASK_PKRU) { - xpkru = get_xsave_addr(&kstate->regs.xsave, XFEATURE_PKRU); - *vpkru = xpkru->pkru; - } - return 0; + return copy_uabi_from_kernel_to_xstate(kstate, ustate, vpkru); } EXPORT_SYMBOL_GPL(fpu_copy_uabi_to_guest_fpstate); #endif /* CONFIG_KVM */ diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c index 75ffaef8c299..6d056b68f4ed 100644 --- a/arch/x86/kernel/fpu/regset.c +++ b/arch/x86/kernel/fpu/regset.c @@ -167,7 +167,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset, } fpu_force_restore(fpu); - ret = copy_uabi_from_kernel_to_xstate(fpu->fpstate, kbuf ?: tmpbuf); + ret = copy_uabi_from_kernel_to_xstate(fpu->fpstate, kbuf ?: tmpbuf, &target->thread.pkru); out: vfree(tmpbuf); diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c index 91d4b6de58ab..558076dbde5b 100644 --- a/arch/x86/kernel/fpu/signal.c +++ b/arch/x86/kernel/fpu/signal.c @@ -396,7 +396,7 @@ static bool __fpu_restore_sig(void __user *buf, void __user *buf_fx, fpregs = &fpu->fpstate->regs; if (use_xsave() && !fx_only) { - if (copy_sigframe_from_user_to_xstate(fpu->fpstate, buf_fx)) + if (copy_sigframe_from_user_to_xstate(tsk, buf_fx)) return false; } else { if (__copy_from_user(&fpregs->fxsave, buf_fx, diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index c8340156bfd2..8f14981a3936 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -1197,7 +1197,7 @@ static int copy_from_buffer(void *dst, unsigned int offset, unsigned int size, static int copy_uabi_to_xstate(struct fpstate *fpstate, const void *kbuf, - const void __user *ubuf) + const void __user *ubuf, u32 *pkru) { struct xregs_state *xsave = &fpstate->regs.xsave; unsigned int offset, size; @@ -1246,6 +1246,21 @@ static int copy_uabi_to_xstate(struct fpstate *fpstate, const void *kbuf, } } + /* + * Update the user protection key storage. Allow KVM to + * pass in a NULL pkru pointer if the mask bit is unset + * for its legacy ABI behavior. + */ + if (pkru) + *pkru = 0; + + if (hdr.xfeatures & XFEATURE_MASK_PKRU) { + struct pkru_state *xpkru; + + xpkru = __raw_xsave_addr(xsave, XFEATURE_PKRU); + *pkru = xpkru->pkru; + } + /* * The state that came in from userspace was user-state only. * Mask all the user states out of 'xfeatures': @@ -1264,9 +1279,9 @@ static int copy_uabi_to_xstate(struct fpstate *fpstate, const void *kbuf, * Convert from a ptrace standard-format kernel buffer to kernel XSAVE[S] * format and copy to the target thread. Used by ptrace and KVM. */ -int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf) +int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf, u32 *pkru) { - return copy_uabi_to_xstate(fpstate, kbuf, NULL); + return copy_uabi_to_xstate(fpstate, kbuf, NULL, pkru); } /* @@ -1274,10 +1289,10 @@ int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf) * XSAVE[S] format and copy to the target thread. This is called from the * sigreturn() and rt_sigreturn() system calls. */ -int copy_sigframe_from_user_to_xstate(struct fpstate *fpstate, +int copy_sigframe_from_user_to_xstate(struct task_struct *tsk, const void __user *ubuf) { - return copy_uabi_to_xstate(fpstate, NULL, ubuf); + return copy_uabi_to_xstate(tsk->thread.fpu.fpstate, NULL, ubuf, &tsk->thread.pkru); } static bool validate_independent_components(u64 mask) diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h index 5ad47031383b..a4ecb04d8d64 100644 --- a/arch/x86/kernel/fpu/xstate.h +++ b/arch/x86/kernel/fpu/xstate.h @@ -46,8 +46,8 @@ extern void __copy_xstate_to_uabi_buf(struct membuf to, struct fpstate *fpstate, u32 pkru_val, enum xstate_copy_mode copy_mode); extern void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk, enum xstate_copy_mode mode); -extern int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf); -extern int copy_sigframe_from_user_to_xstate(struct fpstate *fpstate, const void __user *ubuf); +extern int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf, u32 *pkru); +extern int copy_sigframe_from_user_to_xstate(struct task_struct *tsk, const void __user *ubuf); extern void fpu__init_cpu_xstate(void); -- 2.37.2 Changelog since v5: - Avoids a second copy from the uabi buffer as suggested. - Preserves old KVM_SET_XSAVE behavior where leaving the PKRU bit in the XSTATE header results in PKRU remaining unchanged instead of reinitializing it. - Fixed up patch metadata as requested. Changelog since v4: - Selftest additionally checks PKRU readbacks through ptrace. - Selftest flips all PKRU bits (except the default key). Changelog since v3: - The v3 patch is now part 1 of 2. - Adds a selftest in part 2 of 2. Changelog since v2: - Removed now unused variables in fpu_copy_uabi_to_guest_fpstate Changelog since v1: - Handles the error case of copy_to_buffer().

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