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-rw-r--r--erts/emulator/beam/beam_load.c262
1 files changed, 152 insertions, 110 deletions
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c
index 4427defe0c..d8434c098e 100644
--- a/erts/emulator/beam/beam_load.c
+++ b/erts/emulator/beam/beam_load.c
@@ -254,6 +254,7 @@ typedef struct LoaderState {
char* file_name; /* Name of file we are reading (usually chunk name). */
byte* file_p; /* Current pointer within file. */
unsigned file_left; /* Number of bytes left in file. */
+ ErlDrvBinary* bin; /* Binary holding BEAM file (or NULL) */
/*
* The following are used mainly for diagnostics.
@@ -499,8 +500,10 @@ static void free_state(LoaderState* stp);
static Eterm insert_new_code(Process *c_p, ErtsProcLocks c_p_locks,
Eterm group_leader, Eterm module,
BeamInstr* code, Uint size);
+static int init_iff_file(LoaderState* stp, byte* code, Uint size);
static int scan_iff_file(LoaderState* stp, Uint* chunk_types,
Uint num_types, Uint num_mandatory);
+static int verify_chunks(LoaderState* stp);
static int load_atom_table(LoaderState* stp);
static int load_import_table(LoaderState* stp);
static int read_export_table(LoaderState* stp);
@@ -630,40 +633,23 @@ erts_prepare_loading(LoaderState* stp, Process *c_p, Eterm group_leader,
Eterm* modp, byte* code, Uint unloaded_size)
{
Eterm retval = am_badfile;
- ErlDrvBinary* bin = NULL;
stp->module = *modp;
stp->group_leader = group_leader;
- /*
- * Check if the module is compressed (or possibly invalid/corrupted).
- */
- if ( !(unloaded_size >= 4 &&
- code[0] == 'F' && code[1] == 'O' &&
- code[2] == 'R' && code[3] == '1') ) {
- bin = (ErlDrvBinary *)
- erts_gzinflate_buffer((char*)code, unloaded_size);
- if (bin == NULL) {
- goto load_error;
- }
- code = (byte*)bin->orig_bytes;
- unloaded_size = bin->orig_size;
- }
+#if defined(LOAD_MEMORY_HARD_DEBUG) && defined(DEBUG)
+ erts_fprintf(stderr,"Loading a module\n");
+#endif
/*
* Scan the IFF file.
*/
-#if defined(LOAD_MEMORY_HARD_DEBUG) && defined(DEBUG)
- erts_fprintf(stderr,"Loading a module\n");
-#endif
-
CHKALLOC();
CHKBLK(ERTS_ALC_T_CODE,stp->code);
- stp->file_name = "IFF header for Beam file";
- stp->file_p = code;
- stp->file_left = unloaded_size;
- if (!scan_iff_file(stp, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY)) {
+ if (!init_iff_file(stp, code, unloaded_size) ||
+ !scan_iff_file(stp, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY) ||
+ !verify_chunks(stp)) {
goto load_error;
}
@@ -787,9 +773,6 @@ erts_prepare_loading(LoaderState* stp, Process *c_p, Eterm group_leader,
retval = NIL;
load_error:
- if (bin) {
- driver_free_binary(bin);
- }
if (retval != NIL) {
free_state(stp);
}
@@ -864,6 +847,7 @@ erts_alloc_loader_state(void)
LoaderState* stp;
stp = erts_alloc(ERTS_ALC_T_LOADER_TMP, sizeof(LoaderState));
+ stp->bin = NULL;
stp->function = THE_NON_VALUE; /* Function not known yet */
stp->arity = 0;
stp->specific_op = -1;
@@ -897,6 +881,9 @@ erts_alloc_loader_state(void)
static void
free_state(LoaderState* stp)
{
+ if (stp->bin != 0) {
+ driver_free_binary(stp->bin);
+ }
if (stp->code != 0) {
erts_free(ERTS_ALC_T_CODE, stp->code);
}
@@ -956,6 +943,7 @@ free_state(LoaderState* stp)
if (stp->fname != 0) {
erts_free(ERTS_ALC_T_LOADER_TMP, stp->fname);
}
+
erts_free(ERTS_ALC_T_LOADER_TMP, stp);
}
@@ -1011,23 +999,47 @@ insert_new_code(Process *c_p, ErtsProcLocks c_p_locks,
}
static int
-scan_iff_file(LoaderState* stp, Uint* chunk_types, Uint num_types, Uint num_mandatory)
+init_iff_file(LoaderState* stp, byte* code, Uint size)
{
- MD5_CTX context;
+ Uint form_id = MakeIffId('F', 'O', 'R', '1');
Uint id;
Uint count;
- int i;
+
+ if (size < 4) {
+ goto load_error;
+ }
/*
- * The binary must start with an IFF 'FOR1' chunk.
+ * Check if the module is compressed (or possibly invalid/corrupted).
*/
+ if (MakeIffId(code[0], code[1], code[2], code[3]) != form_id) {
+ stp->bin = (ErlDrvBinary *) erts_gzinflate_buffer((char*)code, size);
+ if (stp->bin == NULL) {
+ goto load_error;
+ }
+ code = (byte*)stp->bin->orig_bytes;
+ size = stp->bin->orig_size;
+ if (size < 4) {
+ goto load_error;
+ }
+ }
- GetInt(stp, 4, id);
- if (id != MakeIffId('F', 'O', 'R', '1')) {
+ /*
+ * The binary must start with an IFF 'FOR1' chunk.
+ */
+ if (MakeIffId(code[0], code[1], code[2], code[3]) != form_id) {
LoadError0(stp, "not a BEAM file: no IFF 'FOR1' chunk");
}
/*
+ * Initialize our "virtual file system".
+ */
+
+ stp->file_name = "IFF header for Beam file";
+ stp->file_p = code + 4;
+ stp->file_left = size - 4;
+
+ /*
* Retrieve the chunk size and verify it. If the size is equal to
* or less than the size of the binary, it is ok and we will use it
* as the limit for the logical file size.
@@ -1048,6 +1060,21 @@ scan_iff_file(LoaderState* stp, Uint* chunk_types, Uint num_types, Uint num_mand
if (id != MakeIffId('B', 'E', 'A', 'M')) {
LoadError0(stp, "not a BEAM file: IFF form type is not 'BEAM'");
}
+ return 1;
+
+ load_error:
+ return 0;
+}
+
+/*
+ * Scan the IFF file. The header should have been verified by init_iff_file().
+ */
+static int
+scan_iff_file(LoaderState* stp, Uint* chunk_types, Uint num_types, Uint num_mandatory)
+{
+ Uint count;
+ Uint id;
+ int i;
/*
* Initialize the chunks[] array in the state.
@@ -1104,17 +1131,25 @@ scan_iff_file(LoaderState* stp, Uint* chunk_types, Uint num_types, Uint num_mand
stp->file_p += count;
stp->file_left -= count;
}
+ return 1;
- /*
- * At this point, we have read the entire IFF file, and we
- * know that it is syntactically correct.
- *
- * Now check that it contains all mandatory chunks. At the
- * same time calculate the MD5 for the module.
- */
+ load_error:
+ return 0;
+}
+
+/*
+ * Verify that all mandatory chunks are present and calculate
+ * MD5 for the module.
+ */
+
+static int
+verify_chunks(LoaderState* stp)
+{
+ int i;
+ MD5_CTX context;
MD5Init(&context);
- for (i = 0; i < num_mandatory; i++) {
+ for (i = 0; i < NUM_MANDATORY; i++) {
if (stp->chunks[i].start != NULL) {
MD5Update(&context, stp->chunks[i].start, stp->chunks[i].size);
} else {
@@ -1124,41 +1159,49 @@ scan_iff_file(LoaderState* stp, Uint* chunk_types, Uint num_types, Uint num_mand
LoadError1(stp, "mandatory chunk of type '%s' not found\n", sbuf);
}
}
- if (LITERAL_CHUNK < num_types) {
- if (stp->chunks[LAMBDA_CHUNK].start != 0) {
- byte* start = stp->chunks[LAMBDA_CHUNK].start;
- Uint left = stp->chunks[LAMBDA_CHUNK].size;
- /*
- * The idea here is to ignore the OldUniq field for the fun; it is
- * based on the old broken hash function, which can be different
- * on little endian and big endian machines.
- */
- if (left >= 4) {
- static byte zero[4];
- MD5Update(&context, start, 4);
- start += 4;
- left -= 4;
+ /*
+ * If there is a lambda chunk, include parts of it in the MD5.
+ */
+ if (stp->chunks[LAMBDA_CHUNK].start != 0) {
+ byte* start = stp->chunks[LAMBDA_CHUNK].start;
+ Uint left = stp->chunks[LAMBDA_CHUNK].size;
+
+ /*
+ * The idea here is to ignore the OldUniq field for the fun; it is
+ * based on the old broken hash function, which can be different
+ * on little endian and big endian machines.
+ */
+ if (left >= 4) {
+ static byte zero[4];
+ MD5Update(&context, start, 4);
+ start += 4;
+ left -= 4;
- while (left >= 24) {
- /* Include: Function Arity Index NumFree */
- MD5Update(&context, start, 20);
- /* Set to zero: OldUniq */
- MD5Update(&context, zero, 4);
- start += 24;
- left -= 24;
- }
- }
- /* Can't happen for a correct 'FunT' chunk */
- if (left > 0) {
- MD5Update(&context, start, left);
+ while (left >= 24) {
+ /* Include: Function Arity Index NumFree */
+ MD5Update(&context, start, 20);
+ /* Set to zero: OldUniq */
+ MD5Update(&context, zero, 4);
+ start += 24;
+ left -= 24;
}
}
- if (stp->chunks[LITERAL_CHUNK].start != 0) {
- MD5Update(&context, stp->chunks[LITERAL_CHUNK].start,
- stp->chunks[LITERAL_CHUNK].size);
+ /* Can't happen for a correct 'FunT' chunk */
+ if (left > 0) {
+ MD5Update(&context, start, left);
}
}
+
+
+ /*
+ * If there is a literal chunk, include it in the MD5.
+ */
+ if (stp->chunks[LITERAL_CHUNK].start != 0) {
+ MD5Update(&context, stp->chunks[LITERAL_CHUNK].start,
+ stp->chunks[LITERAL_CHUNK].size);
+ }
+
MD5Final(stp->mod_md5, &context);
return 1;
@@ -5407,7 +5450,7 @@ code_get_chunk_2(BIF_ALIST_2)
Process* p = BIF_P;
Eterm Bin = BIF_ARG_1;
Eterm Chunk = BIF_ARG_2;
- LoaderState state;
+ LoaderState* stp;
Uint chunk = 0;
ErlSubBin* sb;
Uint offset;
@@ -5419,15 +5462,16 @@ code_get_chunk_2(BIF_ALIST_2)
Eterm real_bin;
byte* temp_alloc = NULL;
+ stp = erts_alloc_loader_state();
if ((start = erts_get_aligned_binary_bytes(Bin, &temp_alloc)) == NULL) {
error:
erts_free_aligned_binary_bytes(temp_alloc);
+ if (stp) {
+ free_state(stp);
+ }
BIF_ERROR(p, BADARG);
}
- state.module = THE_NON_VALUE; /* Suppress diagnostiscs */
- state.file_name = "IFF header for Beam file";
- state.file_p = start;
- state.file_left = binary_size(Bin);
+ stp->module = THE_NON_VALUE; /* Suppress diagnostics */
for (i = 0; i < 4; i++) {
Eterm* chunkp;
Eterm num;
@@ -5445,25 +5489,30 @@ code_get_chunk_2(BIF_ALIST_2)
if (is_not_nil(Chunk)) {
goto error;
}
- if (!scan_iff_file(&state, &chunk, 1, 1)) {
- erts_free_aligned_binary_bytes(temp_alloc);
- return am_undefined;
+ if (!init_iff_file(stp, start, binary_size(Bin)) ||
+ !scan_iff_file(stp, &chunk, 1, 1) ||
+ stp->chunks[0].start == NULL) {
+ res = am_undefined;
+ goto done;
}
ERTS_GET_REAL_BIN(Bin, real_bin, offset, bitoffs, bitsize);
if (bitoffs) {
- res = new_binary(p, state.chunks[0].start, state.chunks[0].size);
+ res = new_binary(p, stp->chunks[0].start, stp->chunks[0].size);
} else {
sb = (ErlSubBin *) HAlloc(p, ERL_SUB_BIN_SIZE);
sb->thing_word = HEADER_SUB_BIN;
sb->orig = real_bin;
- sb->size = state.chunks[0].size;
+ sb->size = stp->chunks[0].size;
sb->bitsize = 0;
sb->bitoffs = 0;
- sb->offs = offset + (state.chunks[0].start - start);
+ sb->offs = offset + (stp->chunks[0].start - start);
sb->is_writable = 0;
res = make_binary(sb);
}
+
+ done:
erts_free_aligned_binary_bytes(temp_alloc);
+ free_state(stp);
return res;
}
@@ -5476,21 +5525,29 @@ code_module_md5_1(BIF_ALIST_1)
{
Process* p = BIF_P;
Eterm Bin = BIF_ARG_1;
- LoaderState state;
+ LoaderState* stp;
+ byte* bytes;
byte* temp_alloc = NULL;
+ Eterm res;
- if ((state.file_p = erts_get_aligned_binary_bytes(Bin, &temp_alloc)) == NULL) {
+ stp = erts_alloc_loader_state();
+ if ((bytes = erts_get_aligned_binary_bytes(Bin, &temp_alloc)) == NULL) {
+ free_state(stp);
BIF_ERROR(p, BADARG);
}
- state.module = THE_NON_VALUE; /* Suppress diagnostiscs */
- state.file_name = "IFF header for Beam file";
- state.file_left = binary_size(Bin);
-
- if (!scan_iff_file(&state, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY)) {
- return am_undefined;
+ stp->module = THE_NON_VALUE; /* Suppress diagnostiscs */
+ if (!init_iff_file(stp, bytes, binary_size(Bin)) ||
+ !scan_iff_file(stp, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY) ||
+ !verify_chunks(stp)) {
+ res = am_undefined;
+ goto done;
}
+ res = new_binary(p, stp->mod_md5, sizeof(stp->mod_md5));
+
+ done:
erts_free_aligned_binary_bytes(temp_alloc);
- return new_binary(p, state.mod_md5, sizeof(state.mod_md5));
+ free_state(stp);
+ return res;
}
#define WORDS_PER_FUNCTION 6
@@ -5776,7 +5833,6 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info)
int code_size;
int rval;
int i;
- ErlDrvBinary* bin = NULL;
byte* temp_alloc = NULL;
byte* bytes;
Uint size;
@@ -5809,29 +5865,17 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info)
size = binary_size(Beam);
/*
- * Uncompressed if needed.
- */
- if (!(size >= 4 && bytes[0] == 'F' && bytes[1] == 'O' &&
- bytes[2] == 'R' && bytes[3] == '1')) {
- bin = (ErlDrvBinary *) erts_gzinflate_buffer((char*)bytes, size);
- if (bin == NULL) {
- goto error;
- }
- bytes = (byte*)bin->orig_bytes;
- size = bin->orig_size;
- }
-
- /*
* Scan the Beam binary and read the interesting sections.
*/
- stp->file_name = "IFF header for Beam file";
- stp->file_p = bytes;
- stp->file_left = size;
stp->module = Mod;
stp->group_leader = p->group_leader;
stp->num_functions = n;
- if (!scan_iff_file(stp, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY)) {
+ if (!init_iff_file(stp, bytes, size)) {
+ goto error;
+ }
+ if (!scan_iff_file(stp, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY) ||
+ !verify_chunks(stp)) {
goto error;
}
define_file(stp, "code chunk header", CODE_CHUNK);
@@ -5986,13 +6030,11 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info)
if (patch_funentries(Patchlist)) {
erts_free_aligned_binary_bytes(temp_alloc);
free_state(stp);
- if (bin != NULL) {
- driver_free_binary(bin);
- }
return Mod;
}
error:
+ erts_free_aligned_binary_bytes(temp_alloc);
free_state(stp);
BIF_ERROR(p, BADARG);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 01:44:31 +0000