cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

syscalltbl.c (4526B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * System call table mapper
      4 *
      5 * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
      6 */
      7
      8#include "syscalltbl.h"
      9#include <stdlib.h>
     10#include <linux/compiler.h>
     11#include <linux/zalloc.h>
     12
     13#ifdef HAVE_SYSCALL_TABLE_SUPPORT
     14#include <string.h>
     15#include "string2.h"
     16
     17#if defined(__x86_64__)
     18#include <asm/syscalls_64.c>
     19const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
     20static const char **syscalltbl_native = syscalltbl_x86_64;
     21#elif defined(__s390x__)
     22#include <asm/syscalls_64.c>
     23const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
     24static const char **syscalltbl_native = syscalltbl_s390_64;
     25#elif defined(__powerpc64__)
     26#include <asm/syscalls_64.c>
     27const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
     28static const char **syscalltbl_native = syscalltbl_powerpc_64;
     29#elif defined(__powerpc__)
     30#include <asm/syscalls_32.c>
     31const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
     32static const char **syscalltbl_native = syscalltbl_powerpc_32;
     33#elif defined(__aarch64__)
     34#include <asm/syscalls.c>
     35const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
     36static const char **syscalltbl_native = syscalltbl_arm64;
     37#elif defined(__mips__)
     38#include <asm/syscalls_n64.c>
     39const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
     40static const char **syscalltbl_native = syscalltbl_mips_n64;
     41#endif
     42
     43struct syscall {
     44	int id;
     45	const char *name;
     46};
     47
     48static int syscallcmpname(const void *vkey, const void *ventry)
     49{
     50	const char *key = vkey;
     51	const struct syscall *entry = ventry;
     52
     53	return strcmp(key, entry->name);
     54}
     55
     56static int syscallcmp(const void *va, const void *vb)
     57{
     58	const struct syscall *a = va, *b = vb;
     59
     60	return strcmp(a->name, b->name);
     61}
     62
     63static int syscalltbl__init_native(struct syscalltbl *tbl)
     64{
     65	int nr_entries = 0, i, j;
     66	struct syscall *entries;
     67
     68	for (i = 0; i <= syscalltbl_native_max_id; ++i)
     69		if (syscalltbl_native[i])
     70			++nr_entries;
     71
     72	entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
     73	if (tbl->syscalls.entries == NULL)
     74		return -1;
     75
     76	for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
     77		if (syscalltbl_native[i]) {
     78			entries[j].name = syscalltbl_native[i];
     79			entries[j].id = i;
     80			++j;
     81		}
     82	}
     83
     84	qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
     85	tbl->syscalls.nr_entries = nr_entries;
     86	tbl->syscalls.max_id	 = syscalltbl_native_max_id;
     87	return 0;
     88}
     89
     90struct syscalltbl *syscalltbl__new(void)
     91{
     92	struct syscalltbl *tbl = malloc(sizeof(*tbl));
     93	if (tbl) {
     94		if (syscalltbl__init_native(tbl)) {
     95			free(tbl);
     96			return NULL;
     97		}
     98	}
     99	return tbl;
    100}
    101
    102void syscalltbl__delete(struct syscalltbl *tbl)
    103{
    104	zfree(&tbl->syscalls.entries);
    105	free(tbl);
    106}
    107
    108const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
    109{
    110	return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
    111}
    112
    113int syscalltbl__id(struct syscalltbl *tbl, const char *name)
    114{
    115	struct syscall *sc = bsearch(name, tbl->syscalls.entries,
    116				     tbl->syscalls.nr_entries, sizeof(*sc),
    117				     syscallcmpname);
    118
    119	return sc ? sc->id : -1;
    120}
    121
    122int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
    123{
    124	int i;
    125	struct syscall *syscalls = tbl->syscalls.entries;
    126
    127	for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
    128		if (strglobmatch(syscalls[i].name, syscall_glob)) {
    129			*idx = i;
    130			return syscalls[i].id;
    131		}
    132	}
    133
    134	return -1;
    135}
    136
    137int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
    138{
    139	*idx = -1;
    140	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
    141}
    142
    143#else /* HAVE_SYSCALL_TABLE_SUPPORT */
    144
    145#include <libaudit.h>
    146
    147struct syscalltbl *syscalltbl__new(void)
    148{
    149	struct syscalltbl *tbl = zalloc(sizeof(*tbl));
    150	if (tbl)
    151		tbl->audit_machine = audit_detect_machine();
    152	return tbl;
    153}
    154
    155void syscalltbl__delete(struct syscalltbl *tbl)
    156{
    157	free(tbl);
    158}
    159
    160const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
    161{
    162	return audit_syscall_to_name(id, tbl->audit_machine);
    163}
    164
    165int syscalltbl__id(struct syscalltbl *tbl, const char *name)
    166{
    167	return audit_name_to_syscall(name, tbl->audit_machine);
    168}
    169
    170int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
    171				  const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
    172{
    173	return -1;
    174}
    175
    176int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
    177{
    178	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
    179}
    180#endif /* HAVE_SYSCALL_TABLE_SUPPORT */