// SPDX-License-Identifier: GPL-2.0-only /* * System call table mapper * * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com> */ #include "syscalltbl.h" #include <stdlib.h> #include <linux/compiler.h> #include <linux/zalloc.h> #ifdef HAVE_SYSCALL_TABLE_SUPPORT #include <string.h> #include "string2.h" #if defined(__x86_64__) #include <asm/syscalls_64.c> const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID; static const char **syscalltbl_native = syscalltbl_x86_64; #elif defined(__s390x__) #include <asm/syscalls_64.c> const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID; static const char **syscalltbl_native = syscalltbl_s390_64; #elif defined(__powerpc64__) #include <asm/syscalls_64.c> const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID; static const char **syscalltbl_native = syscalltbl_powerpc_64; #elif defined(__powerpc__) #include <asm/syscalls_32.c> const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID; static const char **syscalltbl_native = syscalltbl_powerpc_32; #elif defined(__aarch64__) #include <asm/syscalls.c> const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID; static const char **syscalltbl_native = syscalltbl_arm64; #endif struct syscall { int id; const char *name; }; static int syscallcmpname(const void *vkey, const void *ventry) { const char *key = vkey; const struct syscall *entry = ventry; return strcmp(key, entry->name); } static int syscallcmp(const void *va, const void *vb) { const struct syscall *a = va, *b = vb; return strcmp(a->name, b->name); } static int syscalltbl__init_native(struct syscalltbl *tbl) { int nr_entries = 0, i, j; struct syscall *entries; for (i = 0; i <= syscalltbl_native_max_id; ++i) if (syscalltbl_native[i]) ++nr_entries; entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries); if (tbl->syscalls.entries == NULL) return -1; for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) { if (syscalltbl_native[i]) { entries[j].name = syscalltbl_native[i]; entries[j].id = i; ++j; } } qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp); tbl->syscalls.nr_entries = nr_entries; tbl->syscalls.max_id = syscalltbl_native_max_id; return 0; } struct syscalltbl *syscalltbl__new(void) { struct syscalltbl *tbl = malloc(sizeof(*tbl)); if (tbl) { if (syscalltbl__init_native(tbl)) { free(tbl); return NULL; } } return tbl; } void syscalltbl__delete(struct syscalltbl *tbl) { zfree(&tbl->syscalls.entries); free(tbl); } const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) { return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; } int syscalltbl__id(struct syscalltbl *tbl, const char *name) { struct syscall *sc = bsearch(name, tbl->syscalls.entries, tbl->syscalls.nr_entries, sizeof(*sc), syscallcmpname); return sc ? sc->id : -1; } int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx) { int i; struct syscall *syscalls = tbl->syscalls.entries; for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) { if (strglobmatch(syscalls[i].name, syscall_glob)) { *idx = i; return syscalls[i].id; } } return -1; } int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) { *idx = -1; return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); } #else /* HAVE_SYSCALL_TABLE_SUPPORT */ #include <libaudit.h> struct syscalltbl *syscalltbl__new(void) { struct syscalltbl *tbl = zalloc(sizeof(*tbl)); if (tbl) tbl->audit_machine = audit_detect_machine(); return tbl; } void syscalltbl__delete(struct syscalltbl *tbl) { free(tbl); } const char *syscalltbl__name(const struct syscalltbl *tbl, int id) { return audit_syscall_to_name(id, tbl->audit_machine); } int syscalltbl__id(struct syscalltbl *tbl, const char *name) { return audit_name_to_syscall(name, tbl->audit_machine); } int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, const char *syscall_glob __maybe_unused, int *idx __maybe_unused) { return -1; } int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) { return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); } #endif /* HAVE_SYSCALL_TABLE_SUPPORT */