* Lack of bounds checking in vms-alpha.c parse_module
@ 2022-12-12 8:58 Alan Modra
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From: Alan Modra @ 2022-12-12 8:58 UTC (permalink / raw)
To: binutils
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* vms-alpha.c (parse_module): Make length param bfd_size_type.
Delete length == -1 checks. Sanity check record_length.
Sanity check DST__K_MODBEG, DST__K_RTNBEG, DST__K_RTNEND lengths.
Sanity check DST__K_SOURCE and DST__K_LINE_NUM elements
before accessing.
(build_module_list): Pass dst_section size to parse_module.
diff --git a/bfd/vms-alpha.c b/bfd/vms-alpha.c
index c0eb5bc5a2a..3b63259cc81 100644
--- a/bfd/vms-alpha.c
+++ b/bfd/vms-alpha.c
@@ -4345,7 +4345,7 @@ new_module (bfd *abfd)
static bool
parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
- int length)
+ bfd_size_type length)
{
unsigned char *maxptr = ptr + length;
unsigned char *src_ptr, *pcl_ptr;
@@ -4366,7 +4366,7 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
return false;
module->line_table = curr_line;
- while (length == -1 || (ptr + 3) < maxptr)
+ while (ptr + 3 < maxptr)
{
/* The first byte is not counted in the recorded length. */
int rec_length = bfd_getl16 (ptr) + 1;
@@ -4374,15 +4374,19 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
vms_debug2 ((2, "DST record: leng %d, type %d\n", rec_length, rec_type));
- if (length == -1 && rec_type == DST__K_MODEND)
+ if (rec_length > maxptr - ptr)
+ break;
+ if (rec_type == DST__K_MODEND)
break;
switch (rec_type)
{
case DST__K_MODBEG:
+ if (rec_length <= DST_S_B_MODBEG_NAME)
+ break;
module->name
= _bfd_vms_save_counted_string (abfd, ptr + DST_S_B_MODBEG_NAME,
- maxptr - (ptr + DST_S_B_MODBEG_NAME));
+ rec_length - DST_S_B_MODBEG_NAME);
curr_pc = 0;
prev_pc = 0;
@@ -4396,13 +4400,15 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
break;
case DST__K_RTNBEG:
+ if (rec_length <= DST_S_B_RTNBEG_NAME)
+ break;
funcinfo = (struct funcinfo *)
bfd_zalloc (abfd, sizeof (struct funcinfo));
if (!funcinfo)
return false;
funcinfo->name
= _bfd_vms_save_counted_string (abfd, ptr + DST_S_B_RTNBEG_NAME,
- maxptr - (ptr + DST_S_B_RTNBEG_NAME));
+ rec_length - DST_S_B_RTNBEG_NAME);
funcinfo->low = bfd_getl32 (ptr + DST_S_L_RTNBEG_ADDRESS);
funcinfo->next = module->func_table;
module->func_table = funcinfo;
@@ -4412,6 +4418,8 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
break;
case DST__K_RTNEND:
+ if (rec_length < DST_S_L_RTNEND_SIZE + 4)
+ break;
if (!module->func_table)
return false;
module->func_table->high = module->func_table->low
@@ -4444,10 +4452,63 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
vms_debug2 ((3, "source info\n"));
- while (src_ptr < ptr + rec_length)
+ while (src_ptr - ptr < rec_length)
{
int cmd = src_ptr[0], cmd_length, data;
+ switch (cmd)
+ {
+ case DST__K_SRC_DECLFILE:
+ if (src_ptr - ptr + DST_S_B_SRC_DF_LENGTH >= rec_length)
+ cmd_length = 0x10000;
+ else
+ cmd_length = src_ptr[DST_S_B_SRC_DF_LENGTH] + 2;
+ break;
+
+ case DST__K_SRC_DEFLINES_B:
+ cmd_length = 2;
+ break;
+
+ case DST__K_SRC_DEFLINES_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_SRC_INCRLNUM_B:
+ cmd_length = 2;
+ break;
+
+ case DST__K_SRC_SETFILE:
+ cmd_length = 3;
+ break;
+
+ case DST__K_SRC_SETLNUM_L:
+ cmd_length = 5;
+ break;
+
+ case DST__K_SRC_SETLNUM_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_SRC_SETREC_L:
+ cmd_length = 5;
+ break;
+
+ case DST__K_SRC_SETREC_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_SRC_FORMFEED:
+ cmd_length = 1;
+ break;
+
+ default:
+ cmd_length = 2;
+ break;
+ }
+
+ if (src_ptr - ptr + cmd_length > rec_length)
+ break;
+
switch (cmd)
{
case DST__K_SRC_DECLFILE:
@@ -4472,7 +4533,6 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
module->file_table [fileid].name = filename;
module->file_table [fileid].srec = 1;
- cmd_length = src_ptr[DST_S_B_SRC_DF_LENGTH] + 2;
vms_debug2 ((4, "DST_S_C_SRC_DECLFILE: %d, %s\n",
fileid, module->file_table [fileid].name));
}
@@ -4489,7 +4549,6 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
srec->sfile = curr_srec->sfile;
curr_srec->next = srec;
curr_srec = srec;
- cmd_length = 2;
vms_debug2 ((4, "DST_S_C_SRC_DEFLINES_B: %d\n", data));
break;
@@ -4504,14 +4563,12 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
srec->sfile = curr_srec->sfile;
curr_srec->next = srec;
curr_srec = srec;
- cmd_length = 3;
vms_debug2 ((4, "DST_S_C_SRC_DEFLINES_W: %d\n", data));
break;
case DST__K_SRC_INCRLNUM_B:
data = src_ptr[DST_S_B_SRC_UNSBYTE];
curr_srec->line += data;
- cmd_length = 2;
vms_debug2 ((4, "DST_S_C_SRC_INCRLNUM_B: %d\n", data));
break;
@@ -4519,21 +4576,18 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
data = bfd_getl16 (src_ptr + DST_S_W_SRC_UNSWORD);
curr_srec->sfile = data;
curr_srec->srec = module->file_table[data].srec;
- cmd_length = 3;
vms_debug2 ((4, "DST_S_C_SRC_SETFILE: %d\n", data));
break;
case DST__K_SRC_SETLNUM_L:
data = bfd_getl32 (src_ptr + DST_S_L_SRC_UNSLONG);
curr_srec->line = data;
- cmd_length = 5;
vms_debug2 ((4, "DST_S_C_SRC_SETLNUM_L: %d\n", data));
break;
case DST__K_SRC_SETLNUM_W:
data = bfd_getl16 (src_ptr + DST_S_W_SRC_UNSWORD);
curr_srec->line = data;
- cmd_length = 3;
vms_debug2 ((4, "DST_S_C_SRC_SETLNUM_W: %d\n", data));
break;
@@ -4541,7 +4595,6 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
data = bfd_getl32 (src_ptr + DST_S_L_SRC_UNSLONG);
curr_srec->srec = data;
module->file_table[curr_srec->sfile].srec = data;
- cmd_length = 5;
vms_debug2 ((4, "DST_S_C_SRC_SETREC_L: %d\n", data));
break;
@@ -4549,19 +4602,16 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
data = bfd_getl16 (src_ptr + DST_S_W_SRC_UNSWORD);
curr_srec->srec = data;
module->file_table[curr_srec->sfile].srec = data;
- cmd_length = 3;
vms_debug2 ((4, "DST_S_C_SRC_SETREC_W: %d\n", data));
break;
case DST__K_SRC_FORMFEED:
- cmd_length = 1;
vms_debug2 ((4, "DST_S_C_SRC_FORMFEED\n"));
break;
default:
_bfd_error_handler (_("unknown source command %d"),
cmd);
- cmd_length = 2;
break;
}
@@ -4574,18 +4624,114 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
vms_debug2 ((3, "line info\n"));
- while (pcl_ptr < ptr + rec_length)
+ while (pcl_ptr - ptr < rec_length)
{
/* The command byte is signed so we must sign-extend it. */
int cmd = ((signed char *)pcl_ptr)[0], cmd_length, data;
+ switch (cmd)
+ {
+ case DST__K_DELTA_PC_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_DELTA_PC_L:
+ cmd_length = 5;
+ break;
+
+ case DST__K_INCR_LINUM:
+ cmd_length = 2;
+ break;
+
+ case DST__K_INCR_LINUM_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_INCR_LINUM_L:
+ cmd_length = 5;
+ break;
+
+ case DST__K_SET_LINUM_INCR:
+ cmd_length = 2;
+ break;
+
+ case DST__K_SET_LINUM_INCR_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_RESET_LINUM_INCR:
+ cmd_length = 1;
+ break;
+
+ case DST__K_BEG_STMT_MODE:
+ cmd_length = 1;
+ break;
+
+ case DST__K_END_STMT_MODE:
+ cmd_length = 1;
+ break;
+
+ case DST__K_SET_LINUM_B:
+ cmd_length = 2;
+ break;
+
+ case DST__K_SET_LINUM:
+ cmd_length = 3;
+ break;
+
+ case DST__K_SET_LINUM_L:
+ cmd_length = 5;
+ break;
+
+ case DST__K_SET_PC:
+ cmd_length = 2;
+ break;
+
+ case DST__K_SET_PC_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_SET_PC_L:
+ cmd_length = 5;
+ break;
+
+ case DST__K_SET_STMTNUM:
+ cmd_length = 2;
+ break;
+
+ case DST__K_TERM:
+ cmd_length = 2;
+ break;
+
+ case DST__K_TERM_W:
+ cmd_length = 3;
+ break;
+
+ case DST__K_TERM_L:
+ cmd_length = 5;
+ break;
+
+ case DST__K_SET_ABS_PC:
+ cmd_length = 5;
+ break;
+
+ default:
+ if (cmd <= 0)
+ cmd_length = 1;
+ else
+ cmd_length = 2;
+ break;
+ }
+
+ if (pcl_ptr - ptr + cmd_length > rec_length)
+ break;
+
switch (cmd)
{
case DST__K_DELTA_PC_W:
data = bfd_getl16 (pcl_ptr + DST_S_W_PCLINE_UNSWORD);
curr_pc += data;
curr_linenum += 1;
- cmd_length = 3;
vms_debug2 ((4, "DST__K_DELTA_PC_W: %d\n", data));
break;
@@ -4593,131 +4739,111 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
data = bfd_getl32 (pcl_ptr + DST_S_L_PCLINE_UNSLONG);
curr_pc += data;
curr_linenum += 1;
- cmd_length = 5;
vms_debug2 ((4, "DST__K_DELTA_PC_L: %d\n", data));
break;
case DST__K_INCR_LINUM:
data = pcl_ptr[DST_S_B_PCLINE_UNSBYTE];
curr_linenum += data;
- cmd_length = 2;
vms_debug2 ((4, "DST__K_INCR_LINUM: %d\n", data));
break;
case DST__K_INCR_LINUM_W:
data = bfd_getl16 (pcl_ptr + DST_S_W_PCLINE_UNSWORD);
curr_linenum += data;
- cmd_length = 3;
vms_debug2 ((4, "DST__K_INCR_LINUM_W: %d\n", data));
break;
case DST__K_INCR_LINUM_L:
data = bfd_getl32 (pcl_ptr + DST_S_L_PCLINE_UNSLONG);
curr_linenum += data;
- cmd_length = 5;
vms_debug2 ((4, "DST__K_INCR_LINUM_L: %d\n", data));
break;
case DST__K_SET_LINUM_INCR:
_bfd_error_handler
(_("%s not implemented"), "DST__K_SET_LINUM_INCR");
- cmd_length = 2;
break;
case DST__K_SET_LINUM_INCR_W:
_bfd_error_handler
(_("%s not implemented"), "DST__K_SET_LINUM_INCR_W");
- cmd_length = 3;
break;
case DST__K_RESET_LINUM_INCR:
_bfd_error_handler
(_("%s not implemented"), "DST__K_RESET_LINUM_INCR");
- cmd_length = 1;
break;
case DST__K_BEG_STMT_MODE:
_bfd_error_handler
(_("%s not implemented"), "DST__K_BEG_STMT_MODE");
- cmd_length = 1;
break;
case DST__K_END_STMT_MODE:
_bfd_error_handler
(_("%s not implemented"), "DST__K_END_STMT_MODE");
- cmd_length = 1;
break;
case DST__K_SET_LINUM_B:
data = pcl_ptr[DST_S_B_PCLINE_UNSBYTE];
curr_linenum = data;
- cmd_length = 2;
vms_debug2 ((4, "DST__K_SET_LINUM_B: %d\n", data));
break;
case DST__K_SET_LINUM:
data = bfd_getl16 (pcl_ptr + DST_S_W_PCLINE_UNSWORD);
curr_linenum = data;
- cmd_length = 3;
vms_debug2 ((4, "DST__K_SET_LINE_NUM: %d\n", data));
break;
case DST__K_SET_LINUM_L:
data = bfd_getl32 (pcl_ptr + DST_S_L_PCLINE_UNSLONG);
curr_linenum = data;
- cmd_length = 5;
vms_debug2 ((4, "DST__K_SET_LINUM_L: %d\n", data));
break;
case DST__K_SET_PC:
_bfd_error_handler
(_("%s not implemented"), "DST__K_SET_PC");
- cmd_length = 2;
break;
case DST__K_SET_PC_W:
_bfd_error_handler
(_("%s not implemented"), "DST__K_SET_PC_W");
- cmd_length = 3;
break;
case DST__K_SET_PC_L:
_bfd_error_handler
(_("%s not implemented"), "DST__K_SET_PC_L");
- cmd_length = 5;
break;
case DST__K_SET_STMTNUM:
_bfd_error_handler
(_("%s not implemented"), "DST__K_SET_STMTNUM");
- cmd_length = 2;
break;
case DST__K_TERM:
data = pcl_ptr[DST_S_B_PCLINE_UNSBYTE];
curr_pc += data;
- cmd_length = 2;
vms_debug2 ((4, "DST__K_TERM: %d\n", data));
break;
case DST__K_TERM_W:
data = bfd_getl16 (pcl_ptr + DST_S_W_PCLINE_UNSWORD);
curr_pc += data;
- cmd_length = 3;
vms_debug2 ((4, "DST__K_TERM_W: %d\n", data));
break;
case DST__K_TERM_L:
data = bfd_getl32 (pcl_ptr + DST_S_L_PCLINE_UNSLONG);
curr_pc += data;
- cmd_length = 5;
vms_debug2 ((4, "DST__K_TERM_L: %d\n", data));
break;
case DST__K_SET_ABS_PC:
data = bfd_getl32 (pcl_ptr + DST_S_L_PCLINE_UNSLONG);
curr_pc = data;
- cmd_length = 5;
vms_debug2 ((4, "DST__K_SET_ABS_PC: 0x%x\n", data));
break;
@@ -4726,15 +4852,11 @@ parse_module (bfd *abfd, struct module *module, unsigned char *ptr,
{
curr_pc -= cmd;
curr_linenum += 1;
- cmd_length = 1;
vms_debug2 ((4, "bump pc to 0x%lx and line to %d\n",
(unsigned long)curr_pc, curr_linenum));
}
else
- {
- _bfd_error_handler (_("unknown line command %d"), cmd);
- cmd_length = 2;
- }
+ _bfd_error_handler (_("unknown line command %d"), cmd);
break;
}
@@ -4864,7 +4986,8 @@ build_module_list (bfd *abfd)
return NULL;
module = new_module (abfd);
- if (!parse_module (abfd, module, PRIV (dst_section)->contents, -1))
+ if (!parse_module (abfd, module, PRIV (dst_section)->contents,
+ PRIV (dst_section)->size))
return NULL;
list = module;
}
--
Alan Modra
Australia Development Lab, IBM
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2022-12-12 8:58 Lack of bounds checking in vms-alpha.c parse_module Alan Modra
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