diff options
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/mm/gup_longterm.c | 7 | ||||
| -rw-r--r-- | tools/testing/selftests/x86/Makefile | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/x86/sigtrap_loop.c | 101 | ||||
| -rw-r--r-- | tools/testing/vma/vma_internal.h | 16 |
4 files changed, 124 insertions, 2 deletions
diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c index 8a97ac5176a4..29047d2e0c49 100644 --- a/tools/testing/selftests/mm/gup_longterm.c +++ b/tools/testing/selftests/mm/gup_longterm.c @@ -298,8 +298,11 @@ static void run_with_memfd(test_fn fn, const char *desc) log_test_start("%s ... with memfd", desc); fd = memfd_create("test", 0); - if (fd < 0) + if (fd < 0) { ksft_print_msg("memfd_create() failed (%s)\n", strerror(errno)); + log_test_result(KSFT_SKIP); + return; + } fn(fd, pagesize); close(fd); @@ -366,6 +369,8 @@ static void run_with_memfd_hugetlb(test_fn fn, const char *desc, fd = memfd_create("test", flags); if (fd < 0) { ksft_print_msg("memfd_create() failed (%s)\n", strerror(errno)); + log_test_result(KSFT_SKIP); + return; } fn(fd, hugetlbsize); diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile index f703fcfe9f7c..83148875a12c 100644 --- a/tools/testing/selftests/x86/Makefile +++ b/tools/testing/selftests/x86/Makefile @@ -12,7 +12,7 @@ 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 \ + test_vsyscall mov_ss_trap sigtrap_loop \ syscall_arg_fault fsgsbase_restore sigaltstack TARGETS_C_BOTHBITS += nx_stack TARGETS_C_32BIT_ONLY := entry_from_vm86 test_syscall_vdso unwind_vdso \ diff --git a/tools/testing/selftests/x86/sigtrap_loop.c b/tools/testing/selftests/x86/sigtrap_loop.c new file mode 100644 index 000000000000..9d065479e89f --- /dev/null +++ b/tools/testing/selftests/x86/sigtrap_loop.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2025 Intel Corporation + */ +#define _GNU_SOURCE + +#include <err.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ucontext.h> + +#ifdef __x86_64__ +# define REG_IP REG_RIP +#else +# define REG_IP REG_EIP +#endif + +static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *), int flags) +{ + struct sigaction sa; + + memset(&sa, 0, sizeof(sa)); + sa.sa_sigaction = handler; + sa.sa_flags = SA_SIGINFO | flags; + sigemptyset(&sa.sa_mask); + + if (sigaction(sig, &sa, 0)) + err(1, "sigaction"); + + return; +} + +static void sigtrap(int sig, siginfo_t *info, void *ctx_void) +{ + ucontext_t *ctx = (ucontext_t *)ctx_void; + static unsigned int loop_count_on_same_ip; + static unsigned long last_trap_ip; + + if (last_trap_ip == ctx->uc_mcontext.gregs[REG_IP]) { + printf("\tTrapped at %016lx\n", last_trap_ip); + + /* + * If the same IP is hit more than 10 times in a row, it is + * _considered_ an infinite loop. + */ + if (++loop_count_on_same_ip > 10) { + printf("[FAIL]\tDetected SIGTRAP infinite loop\n"); + exit(1); + } + + return; + } + + loop_count_on_same_ip = 0; + last_trap_ip = ctx->uc_mcontext.gregs[REG_IP]; + printf("\tTrapped at %016lx\n", last_trap_ip); +} + +int main(int argc, char *argv[]) +{ + sethandler(SIGTRAP, sigtrap, 0); + + /* + * Set the Trap Flag (TF) to single-step the test code, therefore to + * trigger a SIGTRAP signal after each instruction until the TF is + * cleared. + * + * Because the arithmetic flags are not significant here, the TF is + * set by pushing 0x302 onto the stack and then popping it into the + * flags register. + * + * Four instructions in the following asm code are executed with the + * TF set, thus the SIGTRAP handler is expected to run four times. + */ + printf("[RUN]\tSIGTRAP infinite loop detection\n"); + asm volatile( +#ifdef __x86_64__ + /* + * Avoid clobbering the redzone + * + * Equivalent to "sub $128, %rsp", however -128 can be encoded + * in a single byte immediate while 128 uses 4 bytes. + */ + "add $-128, %rsp\n\t" +#endif + "push $0x302\n\t" + "popf\n\t" + "nop\n\t" + "nop\n\t" + "push $0x202\n\t" + "popf\n\t" +#ifdef __x86_64__ + "sub $-128, %rsp\n\t" +#endif + ); + + printf("[OK]\tNo SIGTRAP infinite loop detected\n"); + return 0; +} diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h index 4505b1c31be1..14718ca23a05 100644 --- a/tools/testing/vma/vma_internal.h +++ b/tools/testing/vma/vma_internal.h @@ -159,6 +159,14 @@ typedef __bitwise unsigned int vm_fault_t; #define ASSERT_EXCLUSIVE_WRITER(x) +/** + * swap - swap values of @a and @b + * @a: first value + * @b: second value + */ +#define swap(a, b) \ + do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) + struct kref { refcount_t refcount; }; @@ -1468,4 +1476,12 @@ static inline void fixup_hugetlb_reservations(struct vm_area_struct *vma) (void)vma; } +static inline void vma_set_file(struct vm_area_struct *vma, struct file *file) +{ + /* Changing an anonymous vma with this is illegal */ + get_file(file); + swap(vma->vm_file, file); + fput(file); +} + #endif /* __MM_VMA_INTERNAL_H */ |