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-rw-r--r--erts/emulator/beam/beam_emu.c1
-rw-r--r--erts/emulator/beam/erl_nif.c104
-rw-r--r--erts/emulator/beam/erl_nif.h2
-rw-r--r--erts/emulator/beam/erl_nif_api_funcs.h4
-rw-r--r--erts/emulator/beam/global.h6
5 files changed, 88 insertions, 29 deletions
diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c
index 6de423ecf8..b21fd3038f 100644
--- a/erts/emulator/beam/beam_emu.c
+++ b/erts/emulator/beam/beam_emu.c
@@ -5309,7 +5309,6 @@ save_stacktrace(Process* c_p, BeamInstr* pc, Eterm* reg, BifFunction bf,
ASSERT(c_p->current);
s->current = c_p->current;
a = s->current[2];
- ASSERT(s->current[2] <= 3);
}
/* Save first stack entry */
ASSERT(pc);
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index 41a9e17c86..2790020117 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -51,6 +51,16 @@ struct erl_module_nif {
int is_orphan; /* if erlang module has been purged */
};
+#ifdef DEBUG
+# define READONLY_CHECK
+#endif
+#ifdef READONLY_CHECK
+# define ADD_READONLY_CHECK(ENV,PTR,SIZE) add_readonly_check(ENV,PTR,SIZE)
+static void add_readonly_check(ErlNifEnv*, unsigned char* ptr, unsigned sz);
+#else
+# define ADD_READONLY_CHECK(ENV,PTR,SIZE) ((void)0)
+#endif
+
#define MIN_HEAP_FRAG_SZ 200
static Eterm* alloc_heap_heavy(ErlNifEnv* env, unsigned need, Eterm* hp);
@@ -106,6 +116,13 @@ static void pre_nif_noproc(ErlNifEnv* env, struct erl_module_nif* mod_nif)
env->tmp_obj_list = NULL;
}
+/* Temporary object header, auto-deallocated when NIF returns. */
+struct enif_tmp_obj_t {
+ struct enif_tmp_obj_t* next;
+ void (*dtor)(struct enif_tmp_obj_t*);
+ /*char data[];*/
+};
+
static ERTS_INLINE void free_tmp_objs(ErlNifEnv* env)
{
while (env->tmp_obj_list != NULL) {
@@ -176,7 +193,6 @@ static void disable_halloc(ErlNifEnv* env)
}
}
-
void* enif_priv_data(ErlNifEnv* env)
{
return env->mod_nif->priv_data;
@@ -257,6 +273,7 @@ int enif_inspect_binary(ErlNifEnv* env, Eterm bin_term, ErlNifBinary* bin)
bin->bin_term = bin_term;
bin->size = binary_size(bin_term);
bin->ref_bin = NULL;
+ ADD_READONLY_CHECK(env, bin->data, bin->size);
return 1;
}
@@ -293,6 +310,7 @@ int enif_inspect_iolist_as_binary(ErlNifEnv* env, Eterm term, ErlNifBinary* bin)
bin->bin_term = THE_NON_VALUE;
bin->ref_bin = NULL;
io_list_to_buf(term, (char*) bin->data, sz);
+ ADD_READONLY_CHECK(env, bin->data, bin->size);
return 1;
}
@@ -357,6 +375,15 @@ void enif_release_binary(ErlNifEnv* env, ErlNifBinary* bin)
#endif
}
+unsigned char* enif_make_new_binary(ErlNifEnv* env, unsigned size,
+ ERL_NIF_TERM* termp)
+{
+ enable_halloc(env);
+ *termp = new_binary(env->proc, NULL, size);
+ disable_halloc(env);
+ return binary_bytes(*termp);
+}
+
int enif_is_identical(ErlNifEnv* env, Eterm lhs, Eterm rhs)
{
return EQ(lhs,rhs);
@@ -991,21 +1018,6 @@ static BeamInstr** get_func_pp(BeamInstr* mod_code, Eterm f_atom, unsigned arity
return NULL;
}
-/*static void refresh_cached_nif_data(BeamInstr* mod_code,
- struct erl_module_nif* mod_nif)
-{
- int i;
- for (i=0; i < mod_nif->entry->num_of_funcs; i++) {
- Eterm f_atom;
- ErlNifFunc* func = &mod_nif->entry->funcs[i];
- BeamInstr* code_ptr;
-
- erts_atom_get(func->name, sys_strlen(func->name), &f_atom);
- code_ptr = *get_func_pp(mod_code, f_atom, func->arity);
- code_ptr[5+2] = ((BeamInstr) mod_nif->priv_data;
- }
-}*/
-
static Eterm mkatom(const char *str)
{
return am_atom_put(str, sys_strlen(str));
@@ -1097,7 +1109,7 @@ BIF_RETTYPE load_nif_2(BIF_ALIST_2)
static const char bad_lib[] = "bad_lib";
static const char reload[] = "reload";
static const char upgrade[] = "upgrade";
- char lib_name[256]; /* BUGBUG: Max-length? */
+ char* lib_name = NULL;
void* handle = NULL;
void* init_func;
ErlNifEntry* entry = NULL;
@@ -1112,9 +1124,14 @@ BIF_RETTYPE load_nif_2(BIF_ALIST_2)
int veto;
struct erl_module_nif* lib = NULL;
- len = intlist_to_buf(BIF_ARG_1, lib_name, sizeof(lib_name)-1);
- if (len < 1) {
- /*erts_fprintf(stderr, "Invalid library path name '%T'\r\n", BIF_ARG_1);*/
+ len = list_length(BIF_ARG_1);
+ if (len < 0) {
+ BIF_ERROR(BIF_P, BADARG);
+ }
+ lib_name = (char *) erts_alloc(ERTS_ALC_T_TMP, len + 1);
+
+ if (intlist_to_buf(BIF_ARG_1, lib_name, len) != len) {
+ erts_free(ERTS_ALC_T_TMP, lib_name);
BIF_ERROR(BIF_P, BADARG);
}
lib_name[len] = '\0';
@@ -1305,6 +1322,7 @@ BIF_RETTYPE load_nif_2(BIF_ALIST_2)
erts_smp_release_system();
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
+ erts_free(ERTS_ALC_T_TMP, lib_name);
BIF_RET(ret);
}
@@ -1358,3 +1376,49 @@ void erl_nif_init()
resource_type_list.name[0] = '\0';
}
+#ifdef READONLY_CHECK
+/* Use checksums to assert that NIFs do not write into inspected binaries
+*/
+static void readonly_check_dtor(struct enif_tmp_obj_t*);
+static unsigned calc_checksum(unsigned char* ptr, unsigned size);
+
+struct readonly_check_t
+{
+ struct enif_tmp_obj_t hdr;
+ unsigned char* ptr;
+ unsigned size;
+ unsigned checksum;
+};
+static void add_readonly_check(ErlNifEnv* env, unsigned char* ptr, unsigned sz)
+{
+ struct readonly_check_t* obj = erts_alloc(ERTS_ALC_T_TMP,
+ sizeof(struct readonly_check_t));
+ obj->hdr.next = env->tmp_obj_list;
+ env->tmp_obj_list = &obj->hdr;
+ obj->hdr.dtor = &readonly_check_dtor;
+ obj->ptr = ptr;
+ obj->size = sz;
+ obj->checksum = calc_checksum(ptr, sz);
+}
+static void readonly_check_dtor(struct enif_tmp_obj_t* o)
+{
+ struct readonly_check_t* obj = (struct readonly_check_t*) o;
+ unsigned chksum = calc_checksum(obj->ptr, obj->size);
+ if (chksum != obj->checksum) {
+ fprintf(stderr, "\r\nReadonly data written by NIF, checksums differ"
+ " %x != %x\r\nABORTING\r\n", chksum, obj->checksum);
+ abort();
+ }
+ erts_free(ERTS_ALC_T_TMP, obj);
+}
+static unsigned calc_checksum(unsigned char* ptr, unsigned size)
+{
+ unsigned i, sum = 0;
+ for (i=0; i<size; i++) {
+ sum ^= ptr[i] << ((i % 4)*8);
+ }
+ return sum;
+}
+
+#endif /* READONLY_CHECK */
+
diff --git a/erts/emulator/beam/erl_nif.h b/erts/emulator/beam/erl_nif.h
index d0f6424724..a345837569 100644
--- a/erts/emulator/beam/erl_nif.h
+++ b/erts/emulator/beam/erl_nif.h
@@ -30,7 +30,7 @@
** 1.0: R13B04
*/
#define ERL_NIF_MAJOR_VERSION 1
-#define ERL_NIF_MINOR_VERSION 0
+#define ERL_NIF_MINOR_VERSION 1
#include <stdlib.h>
diff --git a/erts/emulator/beam/erl_nif_api_funcs.h b/erts/emulator/beam/erl_nif_api_funcs.h
index ec07a976b2..fe8d2664e1 100644
--- a/erts/emulator/beam/erl_nif_api_funcs.h
+++ b/erts/emulator/beam/erl_nif_api_funcs.h
@@ -105,6 +105,8 @@ ERL_NIF_API_FUNC_DECL(void,enif_release_resource,(ErlNifEnv*, void* obj));
ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_resource,(ErlNifEnv*, void* obj));
ERL_NIF_API_FUNC_DECL(int,enif_get_resource,(ErlNifEnv*, ERL_NIF_TERM term, ErlNifResourceType* type, void** objp));
ERL_NIF_API_FUNC_DECL(unsigned,enif_sizeof_resource,(ErlNifEnv*, void* obj));
+ERL_NIF_API_FUNC_DECL(unsigned char*,enif_make_new_binary,(ErlNifEnv*,unsigned size,ERL_NIF_TERM* termp));
+
/*
** Add last to keep compatibility on Windows!!!
*/
@@ -195,7 +197,7 @@ ERL_NIF_API_FUNC_DECL(unsigned,enif_sizeof_resource,(ErlNifEnv*, void* obj));
# define enif_make_resource ERL_NIF_API_FUNC_MACRO(enif_make_resource)
# define enif_get_resource ERL_NIF_API_FUNC_MACRO(enif_get_resource)
# define enif_sizeof_resource ERL_NIF_API_FUNC_MACRO(enif_sizeof_resource)
-
+# define enif_make_new_binary ERL_NIF_API_FUNC_MACRO(enif_make_new_binary)
#endif
#ifndef enif_make_list1
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index cefdf80fb4..fbb40e4202 100644
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -76,12 +76,6 @@ typedef struct line_buf { /* Buffer used in line oriented I/O */
The rest is the overflow buffer. */
} LineBuf;
-/* Temporary object header, auto-deallocated when NIF returns. */
-struct enif_tmp_obj_t {
- struct enif_tmp_obj_t* next;
- void (*dtor)(struct enif_tmp_obj_t*);
- /*char data[];*/
-};
struct enif_environment_t /* ErlNifEnv */
{
struct erl_module_nif* mod_nif;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 13:06:45 +0000