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>
19  const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
20  static const char *const *syscalltbl_native = syscalltbl_x86_64;
21  #elif defined(__i386__)
22  #include <asm/syscalls_32.c>
23  const int syscalltbl_native_max_id = SYSCALLTBL_x86_MAX_ID;
24  static const char *const *syscalltbl_native = syscalltbl_x86;
25  #elif defined(__s390x__)
26  #include <asm/syscalls_64.c>
27  const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
28  static const char *const *syscalltbl_native = syscalltbl_s390_64;
29  #elif defined(__powerpc64__)
30  #include <asm/syscalls_64.c>
31  const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
32  static const char *const *syscalltbl_native = syscalltbl_powerpc_64;
33  #elif defined(__powerpc__)
34  #include <asm/syscalls_32.c>
35  const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
36  static const char *const *syscalltbl_native = syscalltbl_powerpc_32;
37  #elif defined(__aarch64__)
38  #include <asm/syscalls.c>
39  const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
40  static const char *const *syscalltbl_native = syscalltbl_arm64;
41  #elif defined(__mips__)
42  #include <asm/syscalls_n64.c>
43  const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
44  static const char *const *syscalltbl_native = syscalltbl_mips_n64;
45  #elif defined(__loongarch__)
46  #include <asm/syscalls.c>
47  const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID;
48  static const char *const *syscalltbl_native = syscalltbl_loongarch;
49  #else
50  const int syscalltbl_native_max_id = 0;
51  static const char *const syscalltbl_native[] = {
52  	[0] = "unknown",
53  };
54  #endif
55  
56  struct syscall {
57  	int id;
58  	const char *name;
59  };
60  
syscallcmpname(const void * vkey,const void * ventry)61  static int syscallcmpname(const void *vkey, const void *ventry)
62  {
63  	const char *key = vkey;
64  	const struct syscall *entry = ventry;
65  
66  	return strcmp(key, entry->name);
67  }
68  
syscallcmp(const void * va,const void * vb)69  static int syscallcmp(const void *va, const void *vb)
70  {
71  	const struct syscall *a = va, *b = vb;
72  
73  	return strcmp(a->name, b->name);
74  }
75  
syscalltbl__init_native(struct syscalltbl * tbl)76  static int syscalltbl__init_native(struct syscalltbl *tbl)
77  {
78  	int nr_entries = 0, i, j;
79  	struct syscall *entries;
80  
81  	for (i = 0; i <= syscalltbl_native_max_id; ++i)
82  		if (syscalltbl_native[i])
83  			++nr_entries;
84  
85  	entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
86  	if (tbl->syscalls.entries == NULL)
87  		return -1;
88  
89  	for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
90  		if (syscalltbl_native[i]) {
91  			entries[j].name = syscalltbl_native[i];
92  			entries[j].id = i;
93  			++j;
94  		}
95  	}
96  
97  	qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
98  	tbl->syscalls.nr_entries = nr_entries;
99  	tbl->syscalls.max_id	 = syscalltbl_native_max_id;
100  	return 0;
101  }
102  
syscalltbl__new(void)103  struct syscalltbl *syscalltbl__new(void)
104  {
105  	struct syscalltbl *tbl = malloc(sizeof(*tbl));
106  	if (tbl) {
107  		if (syscalltbl__init_native(tbl)) {
108  			free(tbl);
109  			return NULL;
110  		}
111  	}
112  	return tbl;
113  }
114  
syscalltbl__delete(struct syscalltbl * tbl)115  void syscalltbl__delete(struct syscalltbl *tbl)
116  {
117  	zfree(&tbl->syscalls.entries);
118  	free(tbl);
119  }
120  
syscalltbl__name(const struct syscalltbl * tbl __maybe_unused,int id)121  const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
122  {
123  	return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
124  }
125  
syscalltbl__id(struct syscalltbl * tbl,const char * name)126  int syscalltbl__id(struct syscalltbl *tbl, const char *name)
127  {
128  	struct syscall *sc = bsearch(name, tbl->syscalls.entries,
129  				     tbl->syscalls.nr_entries, sizeof(*sc),
130  				     syscallcmpname);
131  
132  	return sc ? sc->id : -1;
133  }
134  
syscalltbl__id_at_idx(struct syscalltbl * tbl,int idx)135  int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx)
136  {
137  	struct syscall *syscalls = tbl->syscalls.entries;
138  
139  	return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1;
140  }
141  
syscalltbl__strglobmatch_next(struct syscalltbl * tbl,const char * syscall_glob,int * idx)142  int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
143  {
144  	int i;
145  	struct syscall *syscalls = tbl->syscalls.entries;
146  
147  	for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
148  		if (strglobmatch(syscalls[i].name, syscall_glob)) {
149  			*idx = i;
150  			return syscalls[i].id;
151  		}
152  	}
153  
154  	return -1;
155  }
156  
syscalltbl__strglobmatch_first(struct syscalltbl * tbl,const char * syscall_glob,int * idx)157  int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
158  {
159  	*idx = -1;
160  	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
161  }
162  
163  #else /* HAVE_SYSCALL_TABLE_SUPPORT */
164  
165  #include <libaudit.h>
166  
syscalltbl__new(void)167  struct syscalltbl *syscalltbl__new(void)
168  {
169  	struct syscalltbl *tbl = zalloc(sizeof(*tbl));
170  	if (tbl)
171  		tbl->audit_machine = audit_detect_machine();
172  	return tbl;
173  }
174  
syscalltbl__delete(struct syscalltbl * tbl)175  void syscalltbl__delete(struct syscalltbl *tbl)
176  {
177  	free(tbl);
178  }
179  
syscalltbl__name(const struct syscalltbl * tbl,int id)180  const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
181  {
182  	return audit_syscall_to_name(id, tbl->audit_machine);
183  }
184  
syscalltbl__id(struct syscalltbl * tbl,const char * name)185  int syscalltbl__id(struct syscalltbl *tbl, const char *name)
186  {
187  	return audit_name_to_syscall(name, tbl->audit_machine);
188  }
189  
syscalltbl__id_at_idx(struct syscalltbl * tbl __maybe_unused,int idx)190  int syscalltbl__id_at_idx(struct syscalltbl *tbl __maybe_unused, int idx)
191  {
192  	return idx;
193  }
194  
syscalltbl__strglobmatch_next(struct syscalltbl * tbl __maybe_unused,const char * syscall_glob __maybe_unused,int * idx __maybe_unused)195  int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
196  				  const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
197  {
198  	return -1;
199  }
200  
syscalltbl__strglobmatch_first(struct syscalltbl * tbl,const char * syscall_glob,int * idx)201  int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
202  {
203  	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
204  }
205  #endif /* HAVE_SYSCALL_TABLE_SUPPORT */
206