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lttng-filter-validator.c
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lttng-filter-validator.c
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/* SPDX-License-Identifier: MIT
*
* lttng-filter-validator.c
*
* LTTng modules filter bytecode validator.
*
* Copyright (C) 2010-2016 Mathieu Desnoyers <[email protected]>
*/
#include <linux/types.h>
#include <linux/jhash.h>
#include <linux/slab.h>
#include <wrapper/list.h>
#include <lttng-filter.h>
#define MERGE_POINT_TABLE_BITS 7
#define MERGE_POINT_TABLE_SIZE (1U << MERGE_POINT_TABLE_BITS)
/* merge point table node */
struct mp_node {
struct hlist_node node;
/* Context at merge point */
struct vstack stack;
unsigned long target_pc;
};
struct mp_table {
struct hlist_head mp_head[MERGE_POINT_TABLE_SIZE];
};
static
int lttng_hash_match(struct mp_node *mp_node, unsigned long key_pc)
{
if (mp_node->target_pc == key_pc)
return 1;
else
return 0;
}
static
int merge_points_compare(const struct vstack *stacka,
const struct vstack *stackb)
{
int i, len;
if (stacka->top != stackb->top)
return 1;
len = stacka->top + 1;
WARN_ON_ONCE(len < 0);
for (i = 0; i < len; i++) {
if (stacka->e[i].type != stackb->e[i].type)
return 1;
}
return 0;
}
static
int merge_point_add_check(struct mp_table *mp_table, unsigned long target_pc,
const struct vstack *stack)
{
struct mp_node *mp_node;
unsigned long hash = jhash_1word(target_pc, 0);
struct hlist_head *head;
struct mp_node *lookup_node;
int found = 0;
dbg_printk("Filter: adding merge point at offset %lu, hash %lu\n",
target_pc, hash);
mp_node = kzalloc(sizeof(struct mp_node), GFP_KERNEL);
if (!mp_node)
return -ENOMEM;
mp_node->target_pc = target_pc;
memcpy(&mp_node->stack, stack, sizeof(mp_node->stack));
head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)];
lttng_hlist_for_each_entry(lookup_node, head, node) {
if (lttng_hash_match(lookup_node, target_pc)) {
found = 1;
break;
}
}
if (found) {
/* Key already present */
dbg_printk("Filter: compare merge points for offset %lu, hash %lu\n",
target_pc, hash);
kfree(mp_node);
if (merge_points_compare(stack, &lookup_node->stack)) {
printk(KERN_WARNING "Merge points differ for offset %lu\n",
target_pc);
return -EINVAL;
}
} else {
hlist_add_head(&mp_node->node, head);
}
return 0;
}
/*
* Binary comparators use top of stack and top of stack -1.
*/
static
int bin_op_compare_check(struct vstack *stack, const filter_opcode_t opcode,
const char *str)
{
if (unlikely(!vstack_ax(stack) || !vstack_bx(stack)))
goto error_empty;
switch (vstack_ax(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_STRING:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_TYPE_UNKNOWN:
goto unknown;
case REG_STRING:
break;
case REG_STAR_GLOB_STRING:
if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) {
goto error_mismatch;
}
break;
case REG_S64:
goto error_mismatch;
}
break;
case REG_STAR_GLOB_STRING:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_TYPE_UNKNOWN:
goto unknown;
case REG_STRING:
if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) {
goto error_mismatch;
}
break;
case REG_STAR_GLOB_STRING:
case REG_S64:
goto error_mismatch;
}
break;
case REG_S64:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_TYPE_UNKNOWN:
goto unknown;
case REG_STRING:
case REG_STAR_GLOB_STRING:
goto error_mismatch;
case REG_S64:
break;
}
break;
case REG_TYPE_UNKNOWN:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_TYPE_UNKNOWN:
case REG_STRING:
case REG_STAR_GLOB_STRING:
case REG_S64:
goto unknown;
}
break;
}
return 0;
unknown:
return 1;
error_empty:
printk(KERN_WARNING "empty stack for '%s' binary operator\n", str);
return -EINVAL;
error_mismatch:
printk(KERN_WARNING "type mismatch for '%s' binary operator\n", str);
return -EINVAL;
error_type:
printk(KERN_WARNING "unknown type for '%s' binary operator\n", str);
return -EINVAL;
}
/*
* Binary bitwise operators use top of stack and top of stack -1.
* Return 0 if typing is known to match, 1 if typing is dynamic
* (unknown), negative error value on error.
*/
static
int bin_op_bitwise_check(struct vstack *stack, filter_opcode_t opcode,
const char *str)
{
if (unlikely(!vstack_ax(stack) || !vstack_bx(stack)))
goto error_empty;
switch (vstack_ax(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_TYPE_UNKNOWN:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_TYPE_UNKNOWN:
case REG_STRING:
case REG_STAR_GLOB_STRING:
case REG_S64:
goto unknown;
}
break;
case REG_S64:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_type;
case REG_TYPE_UNKNOWN:
goto unknown;
case REG_S64:
break;
}
break;
}
return 0;
unknown:
return 1;
error_empty:
printk(KERN_WARNING "empty stack for '%s' binary operator\n", str);
return -EINVAL;
error_type:
printk(KERN_WARNING "unknown type for '%s' binary operator\n", str);
return -EINVAL;
}
static
int validate_get_symbol(struct bytecode_runtime *bytecode,
const struct get_symbol *sym)
{
const char *str, *str_limit;
size_t len_limit;
if (sym->offset >= bytecode->p.bc->bc.len - bytecode->p.bc->bc.reloc_offset)
return -EINVAL;
str = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + sym->offset;
str_limit = bytecode->p.bc->bc.data + bytecode->p.bc->bc.len;
len_limit = str_limit - str;
if (strnlen(str, len_limit) == len_limit)
return -EINVAL;
return 0;
}
/*
* Validate bytecode range overflow within the validation pass.
* Called for each instruction encountered.
*/
static
int bytecode_validate_overflow(struct bytecode_runtime *bytecode,
char *start_pc, char *pc)
{
int ret = 0;
switch (*(filter_opcode_t *) pc) {
case FILTER_OP_UNKNOWN:
default:
{
printk(KERN_WARNING "unknown bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
break;
}
case FILTER_OP_RETURN:
case FILTER_OP_RETURN_S64:
{
if (unlikely(pc + sizeof(struct return_op)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
/* binary */
case FILTER_OP_MUL:
case FILTER_OP_DIV:
case FILTER_OP_MOD:
case FILTER_OP_PLUS:
case FILTER_OP_MINUS:
case FILTER_OP_EQ_DOUBLE:
case FILTER_OP_NE_DOUBLE:
case FILTER_OP_GT_DOUBLE:
case FILTER_OP_LT_DOUBLE:
case FILTER_OP_GE_DOUBLE:
case FILTER_OP_LE_DOUBLE:
/* Floating point */
case FILTER_OP_EQ_DOUBLE_S64:
case FILTER_OP_NE_DOUBLE_S64:
case FILTER_OP_GT_DOUBLE_S64:
case FILTER_OP_LT_DOUBLE_S64:
case FILTER_OP_GE_DOUBLE_S64:
case FILTER_OP_LE_DOUBLE_S64:
case FILTER_OP_EQ_S64_DOUBLE:
case FILTER_OP_NE_S64_DOUBLE:
case FILTER_OP_GT_S64_DOUBLE:
case FILTER_OP_LT_S64_DOUBLE:
case FILTER_OP_GE_S64_DOUBLE:
case FILTER_OP_LE_S64_DOUBLE:
case FILTER_OP_LOAD_FIELD_REF_DOUBLE:
case FILTER_OP_GET_CONTEXT_REF_DOUBLE:
case FILTER_OP_LOAD_DOUBLE:
case FILTER_OP_CAST_DOUBLE_TO_S64:
case FILTER_OP_UNARY_PLUS_DOUBLE:
case FILTER_OP_UNARY_MINUS_DOUBLE:
case FILTER_OP_UNARY_NOT_DOUBLE:
{
printk(KERN_WARNING "unsupported bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
break;
}
case FILTER_OP_EQ:
case FILTER_OP_NE:
case FILTER_OP_GT:
case FILTER_OP_LT:
case FILTER_OP_GE:
case FILTER_OP_LE:
case FILTER_OP_EQ_STRING:
case FILTER_OP_NE_STRING:
case FILTER_OP_GT_STRING:
case FILTER_OP_LT_STRING:
case FILTER_OP_GE_STRING:
case FILTER_OP_LE_STRING:
case FILTER_OP_EQ_STAR_GLOB_STRING:
case FILTER_OP_NE_STAR_GLOB_STRING:
case FILTER_OP_EQ_S64:
case FILTER_OP_NE_S64:
case FILTER_OP_GT_S64:
case FILTER_OP_LT_S64:
case FILTER_OP_GE_S64:
case FILTER_OP_LE_S64:
case FILTER_OP_BIT_RSHIFT:
case FILTER_OP_BIT_LSHIFT:
case FILTER_OP_BIT_AND:
case FILTER_OP_BIT_OR:
case FILTER_OP_BIT_XOR:
{
if (unlikely(pc + sizeof(struct binary_op)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
/* unary */
case FILTER_OP_UNARY_PLUS:
case FILTER_OP_UNARY_MINUS:
case FILTER_OP_UNARY_NOT:
case FILTER_OP_UNARY_PLUS_S64:
case FILTER_OP_UNARY_MINUS_S64:
case FILTER_OP_UNARY_NOT_S64:
case FILTER_OP_UNARY_BIT_NOT:
{
if (unlikely(pc + sizeof(struct unary_op)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
/* logical */
case FILTER_OP_AND:
case FILTER_OP_OR:
{
if (unlikely(pc + sizeof(struct logical_op)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
/* load field ref */
case FILTER_OP_LOAD_FIELD_REF:
{
printk(KERN_WARNING "Unknown field ref type\n");
ret = -EINVAL;
break;
}
/* get context ref */
case FILTER_OP_GET_CONTEXT_REF:
{
printk(KERN_WARNING "Unknown field ref type\n");
ret = -EINVAL;
break;
}
case FILTER_OP_LOAD_FIELD_REF_STRING:
case FILTER_OP_LOAD_FIELD_REF_SEQUENCE:
case FILTER_OP_LOAD_FIELD_REF_USER_STRING:
case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE:
case FILTER_OP_LOAD_FIELD_REF_S64:
case FILTER_OP_GET_CONTEXT_REF_STRING:
case FILTER_OP_GET_CONTEXT_REF_S64:
{
if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
/* load from immediate operand */
case FILTER_OP_LOAD_STRING:
case FILTER_OP_LOAD_STAR_GLOB_STRING:
{
struct load_op *insn = (struct load_op *) pc;
uint32_t str_len, maxlen;
if (unlikely(pc + sizeof(struct load_op)
> start_pc + bytecode->len)) {
ret = -ERANGE;
break;
}
maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op);
str_len = strnlen(insn->data, maxlen);
if (unlikely(str_len >= maxlen)) {
/* Final '\0' not found within range */
ret = -ERANGE;
}
break;
}
case FILTER_OP_LOAD_S64:
{
if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
case FILTER_OP_CAST_TO_S64:
case FILTER_OP_CAST_NOP:
{
if (unlikely(pc + sizeof(struct cast_op)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
/*
* Instructions for recursive traversal through composed types.
*/
case FILTER_OP_GET_CONTEXT_ROOT:
case FILTER_OP_GET_APP_CONTEXT_ROOT:
case FILTER_OP_GET_PAYLOAD_ROOT:
case FILTER_OP_LOAD_FIELD:
case FILTER_OP_LOAD_FIELD_S8:
case FILTER_OP_LOAD_FIELD_S16:
case FILTER_OP_LOAD_FIELD_S32:
case FILTER_OP_LOAD_FIELD_S64:
case FILTER_OP_LOAD_FIELD_U8:
case FILTER_OP_LOAD_FIELD_U16:
case FILTER_OP_LOAD_FIELD_U32:
case FILTER_OP_LOAD_FIELD_U64:
case FILTER_OP_LOAD_FIELD_STRING:
case FILTER_OP_LOAD_FIELD_SEQUENCE:
case FILTER_OP_LOAD_FIELD_DOUBLE:
if (unlikely(pc + sizeof(struct load_op)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
case FILTER_OP_GET_SYMBOL:
{
struct load_op *insn = (struct load_op *) pc;
struct get_symbol *sym = (struct get_symbol *) insn->data;
if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol)
> start_pc + bytecode->len)) {
ret = -ERANGE;
break;
}
ret = validate_get_symbol(bytecode, sym);
break;
}
case FILTER_OP_GET_SYMBOL_FIELD:
printk(KERN_WARNING "Unexpected get symbol field\n");
ret = -EINVAL;
break;
case FILTER_OP_GET_INDEX_U16:
if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
case FILTER_OP_GET_INDEX_U64:
if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64)
> start_pc + bytecode->len)) {
ret = -ERANGE;
}
break;
}
return ret;
}
static
unsigned long delete_all_nodes(struct mp_table *mp_table)
{
struct mp_node *mp_node;
struct hlist_node *tmp;
unsigned long nr_nodes = 0;
int i;
for (i = 0; i < MERGE_POINT_TABLE_SIZE; i++) {
struct hlist_head *head;
head = &mp_table->mp_head[i];
lttng_hlist_for_each_entry_safe(mp_node, tmp, head, node) {
kfree(mp_node);
nr_nodes++;
}
}
return nr_nodes;
}
/*
* Return value:
* >=0: success
* <0: error
*/
static
int validate_instruction_context(struct bytecode_runtime *bytecode,
struct vstack *stack,
char *start_pc,
char *pc)
{
int ret = 0;
const filter_opcode_t opcode = *(filter_opcode_t *) pc;
switch (opcode) {
case FILTER_OP_UNKNOWN:
default:
{
printk(KERN_WARNING "unknown bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
goto end;
}
case FILTER_OP_RETURN:
case FILTER_OP_RETURN_S64:
{
goto end;
}
/* binary */
case FILTER_OP_MUL:
case FILTER_OP_DIV:
case FILTER_OP_MOD:
case FILTER_OP_PLUS:
case FILTER_OP_MINUS:
/* Floating point */
case FILTER_OP_EQ_DOUBLE:
case FILTER_OP_NE_DOUBLE:
case FILTER_OP_GT_DOUBLE:
case FILTER_OP_LT_DOUBLE:
case FILTER_OP_GE_DOUBLE:
case FILTER_OP_LE_DOUBLE:
case FILTER_OP_EQ_DOUBLE_S64:
case FILTER_OP_NE_DOUBLE_S64:
case FILTER_OP_GT_DOUBLE_S64:
case FILTER_OP_LT_DOUBLE_S64:
case FILTER_OP_GE_DOUBLE_S64:
case FILTER_OP_LE_DOUBLE_S64:
case FILTER_OP_EQ_S64_DOUBLE:
case FILTER_OP_NE_S64_DOUBLE:
case FILTER_OP_GT_S64_DOUBLE:
case FILTER_OP_LT_S64_DOUBLE:
case FILTER_OP_GE_S64_DOUBLE:
case FILTER_OP_LE_S64_DOUBLE:
case FILTER_OP_UNARY_PLUS_DOUBLE:
case FILTER_OP_UNARY_MINUS_DOUBLE:
case FILTER_OP_UNARY_NOT_DOUBLE:
case FILTER_OP_LOAD_FIELD_REF_DOUBLE:
case FILTER_OP_LOAD_DOUBLE:
case FILTER_OP_CAST_DOUBLE_TO_S64:
case FILTER_OP_GET_CONTEXT_REF_DOUBLE:
{
printk(KERN_WARNING "unsupported bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
goto end;
}
case FILTER_OP_EQ:
{
ret = bin_op_compare_check(stack, opcode, "==");
if (ret < 0)
goto end;
break;
}
case FILTER_OP_NE:
{
ret = bin_op_compare_check(stack, opcode, "!=");
if (ret < 0)
goto end;
break;
}
case FILTER_OP_GT:
{
ret = bin_op_compare_check(stack, opcode, ">");
if (ret < 0)
goto end;
break;
}
case FILTER_OP_LT:
{
ret = bin_op_compare_check(stack, opcode, "<");
if (ret < 0)
goto end;
break;
}
case FILTER_OP_GE:
{
ret = bin_op_compare_check(stack, opcode, ">=");
if (ret < 0)
goto end;
break;
}
case FILTER_OP_LE:
{
ret = bin_op_compare_check(stack, opcode, "<=");
if (ret < 0)
goto end;
break;
}
case FILTER_OP_EQ_STRING:
case FILTER_OP_NE_STRING:
case FILTER_OP_GT_STRING:
case FILTER_OP_LT_STRING:
case FILTER_OP_GE_STRING:
case FILTER_OP_LE_STRING:
{
if (!vstack_ax(stack) || !vstack_bx(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
if (vstack_ax(stack)->type != REG_STRING
|| vstack_bx(stack)->type != REG_STRING) {
printk(KERN_WARNING "Unexpected register type for string comparator\n");
ret = -EINVAL;
goto end;
}
break;
}
case FILTER_OP_EQ_STAR_GLOB_STRING:
case FILTER_OP_NE_STAR_GLOB_STRING:
{
if (!vstack_ax(stack) || !vstack_bx(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING
&& vstack_bx(stack)->type != REG_STAR_GLOB_STRING) {
printk(KERN_WARNING "Unexpected register type for globbing pattern comparator\n");
ret = -EINVAL;
goto end;
}
break;
}
case FILTER_OP_EQ_S64:
case FILTER_OP_NE_S64:
case FILTER_OP_GT_S64:
case FILTER_OP_LT_S64:
case FILTER_OP_GE_S64:
case FILTER_OP_LE_S64:
{
if (!vstack_ax(stack) || !vstack_bx(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
if (vstack_ax(stack)->type != REG_S64
|| vstack_bx(stack)->type != REG_S64) {
printk(KERN_WARNING "Unexpected register type for s64 comparator\n");
ret = -EINVAL;
goto end;
}
break;
}
case FILTER_OP_BIT_RSHIFT:
ret = bin_op_bitwise_check(stack, opcode, ">>");
if (ret < 0)
goto end;
break;
case FILTER_OP_BIT_LSHIFT:
ret = bin_op_bitwise_check(stack, opcode, "<<");
if (ret < 0)
goto end;
break;
case FILTER_OP_BIT_AND:
ret = bin_op_bitwise_check(stack, opcode, "&");
if (ret < 0)
goto end;
break;
case FILTER_OP_BIT_OR:
ret = bin_op_bitwise_check(stack, opcode, "|");
if (ret < 0)
goto end;
break;
case FILTER_OP_BIT_XOR:
ret = bin_op_bitwise_check(stack, opcode, "^");
if (ret < 0)
goto end;
break;
/* unary */
case FILTER_OP_UNARY_PLUS:
case FILTER_OP_UNARY_MINUS:
case FILTER_OP_UNARY_NOT:
{
if (!vstack_ax(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
switch (vstack_ax(stack)->type) {
default:
case REG_DOUBLE:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STRING:
case REG_STAR_GLOB_STRING:
printk(KERN_WARNING "Unary op can only be applied to numeric or floating point registers\n");
ret = -EINVAL;
goto end;
case REG_S64:
case REG_TYPE_UNKNOWN:
break;
}
break;
}
case FILTER_OP_UNARY_BIT_NOT:
{
if (!vstack_ax(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
switch (vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STRING:
case REG_STAR_GLOB_STRING:
case REG_DOUBLE:
printk(KERN_WARNING "Unary bitwise op can only be applied to numeric registers\n");
ret = -EINVAL;
goto end;
case REG_S64:
break;
case REG_TYPE_UNKNOWN:
break;
}
break;
}
case FILTER_OP_UNARY_PLUS_S64:
case FILTER_OP_UNARY_MINUS_S64:
case FILTER_OP_UNARY_NOT_S64:
{
if (!vstack_ax(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
if (vstack_ax(stack)->type != REG_S64) {
printk(KERN_WARNING "Invalid register type\n");
ret = -EINVAL;
goto end;
}
break;
}
/* logical */
case FILTER_OP_AND:
case FILTER_OP_OR:
{
struct logical_op *insn = (struct logical_op *) pc;
if (!vstack_ax(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
if (vstack_ax(stack)->type != REG_S64) {
printk(KERN_WARNING "Logical comparator expects S64 register\n");
ret = -EINVAL;
goto end;
}
dbg_printk("Validate jumping to bytecode offset %u\n",
(unsigned int) insn->skip_offset);
if (unlikely(start_pc + insn->skip_offset <= pc)) {
printk(KERN_WARNING "Loops are not allowed in bytecode\n");
ret = -EINVAL;
goto end;
}
break;
}
/* load field ref */
case FILTER_OP_LOAD_FIELD_REF:
{
printk(KERN_WARNING "Unknown field ref type\n");
ret = -EINVAL;
goto end;
}
case FILTER_OP_LOAD_FIELD_REF_STRING:
case FILTER_OP_LOAD_FIELD_REF_SEQUENCE:
case FILTER_OP_LOAD_FIELD_REF_USER_STRING:
case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE:
{
struct load_op *insn = (struct load_op *) pc;
struct field_ref *ref = (struct field_ref *) insn->data;
dbg_printk("Validate load field ref offset %u type string\n",
ref->offset);
break;
}
case FILTER_OP_LOAD_FIELD_REF_S64:
{
struct load_op *insn = (struct load_op *) pc;
struct field_ref *ref = (struct field_ref *) insn->data;
dbg_printk("Validate load field ref offset %u type s64\n",
ref->offset);
break;
}
/* load from immediate operand */
case FILTER_OP_LOAD_STRING:
case FILTER_OP_LOAD_STAR_GLOB_STRING:
{
break;
}
case FILTER_OP_LOAD_S64:
{
break;
}
case FILTER_OP_CAST_TO_S64:
{
struct cast_op *insn = (struct cast_op *) pc;
if (!vstack_ax(stack)) {
printk(KERN_WARNING "Empty stack\n");
ret = -EINVAL;
goto end;
}
switch (vstack_ax(stack)->type) {
default:
case REG_DOUBLE:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STRING:
case REG_STAR_GLOB_STRING:
printk(KERN_WARNING "Cast op can only be applied to numeric or floating point registers\n");
ret = -EINVAL;
goto end;
case REG_S64:
break;
}
if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) {
if (vstack_ax(stack)->type != REG_DOUBLE) {
printk(KERN_WARNING "Cast expects double\n");
ret = -EINVAL;
goto end;
}
}
break;
}
case FILTER_OP_CAST_NOP:
{
break;
}
/* get context ref */
case FILTER_OP_GET_CONTEXT_REF:
{
printk(KERN_WARNING "Unknown get context ref type\n");
ret = -EINVAL;
goto end;
}
case FILTER_OP_GET_CONTEXT_REF_STRING:
{
struct load_op *insn = (struct load_op *) pc;
struct field_ref *ref = (struct field_ref *) insn->data;
dbg_printk("Validate get context ref offset %u type string\n",
ref->offset);
break;
}
case FILTER_OP_GET_CONTEXT_REF_S64:
{
struct load_op *insn = (struct load_op *) pc;
struct field_ref *ref = (struct field_ref *) insn->data;
dbg_printk("Validate get context ref offset %u type s64\n",
ref->offset);
break;
}
/*
* Instructions for recursive traversal through composed types.
*/
case FILTER_OP_GET_CONTEXT_ROOT:
{
dbg_printk("Validate get context root\n");
break;
}
case FILTER_OP_GET_APP_CONTEXT_ROOT:
{
dbg_printk("Validate get app context root\n");
break;
}
case FILTER_OP_GET_PAYLOAD_ROOT:
{
dbg_printk("Validate get payload root\n");
break;
}
case FILTER_OP_LOAD_FIELD:
{
/*
* We tolerate that field type is unknown at validation,
* because we are performing the load specialization in
* a phase after validation.
*/
dbg_printk("Validate load field\n");
break;
}
case FILTER_OP_LOAD_FIELD_S8:
{
dbg_printk("Validate load field s8\n");
break;
}
case FILTER_OP_LOAD_FIELD_S16:
{
dbg_printk("Validate load field s16\n");
break;
}
case FILTER_OP_LOAD_FIELD_S32:
{
dbg_printk("Validate load field s32\n");
break;
}
case FILTER_OP_LOAD_FIELD_S64:
{
dbg_printk("Validate load field s64\n");
break;
}
case FILTER_OP_LOAD_FIELD_U8:
{