Revision 5f4fc6d440d77a2cf74fe4ea56955674ac7e35e7 authored by Linus Torvalds on 19 July 2019, 17:06:06 UTC, committed by Linus Torvalds on 19 July 2019, 17:06:06 UTC
Pull networking fixes from David Miller: 1) Fix AF_XDP cq entry leak, from Ilya Maximets. 2) Fix handling of PHY power-down on RTL8411B, from Heiner Kallweit. 3) Add some new PCI IDs to iwlwifi, from Ihab Zhaika. 4) Fix handling of neigh timers wrt. entries added by userspace, from Lorenzo Bianconi. 5) Various cases of missing of_node_put(), from Nishka Dasgupta. 6) The new NET_ACT_CT needs to depend upon NF_NAT, from Yue Haibing. 7) Various RDS layer fixes, from Gerd Rausch. 8) Fix some more fallout from TCQ_F_CAN_BYPASS generalization, from Cong Wang. 9) Fix FIB source validation checks over loopback, also from Cong Wang. 10) Use promisc for unsupported number of filters, from Justin Chen. 11) Missing sibling route unlink on failure in ipv6, from Ido Schimmel. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (90 commits) tcp: fix tcp_set_congestion_control() use from bpf hook ag71xx: fix return value check in ag71xx_probe() ag71xx: fix error return code in ag71xx_probe() usb: qmi_wwan: add D-Link DWM-222 A2 device ID bnxt_en: Fix VNIC accounting when enabling aRFS on 57500 chips. net: dsa: sja1105: Fix missing unlock on error in sk_buff() gve: replace kfree with kvfree selftests/bpf: fix test_xdp_noinline on s390 selftests/bpf: fix "valid read map access into a read-only array 1" on s390 net/mlx5: Replace kfree with kvfree MAINTAINERS: update netsec driver ipv6: Unlink sibling route in case of failure liquidio: Replace vmalloc + memset with vzalloc udp: Fix typo in net/ipv4/udp.c net: bcmgenet: use promisc for unsupported filters ipv6: rt6_check should return NULL if 'from' is NULL tipc: initialize 'validated' field of received packets selftests: add a test case for rp_filter fib: relax source validation check for loopback packets mlxsw: spectrum: Do not process learned records with a dummy FID ...
asn1_decoder.c
// SPDX-License-Identifier: GPL-2.0-or-later
/* Decoder for ASN.1 BER/DER/CER encoded bytestream
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/asn1_decoder.h>
#include <linux/asn1_ber_bytecode.h>
static const unsigned char asn1_op_lengths[ASN1_OP__NR] = {
/* OPC TAG JMP ACT */
[ASN1_OP_MATCH] = 1 + 1,
[ASN1_OP_MATCH_OR_SKIP] = 1 + 1,
[ASN1_OP_MATCH_ACT] = 1 + 1 + 1,
[ASN1_OP_MATCH_ACT_OR_SKIP] = 1 + 1 + 1,
[ASN1_OP_MATCH_JUMP] = 1 + 1 + 1,
[ASN1_OP_MATCH_JUMP_OR_SKIP] = 1 + 1 + 1,
[ASN1_OP_MATCH_ANY] = 1,
[ASN1_OP_MATCH_ANY_OR_SKIP] = 1,
[ASN1_OP_MATCH_ANY_ACT] = 1 + 1,
[ASN1_OP_MATCH_ANY_ACT_OR_SKIP] = 1 + 1,
[ASN1_OP_COND_MATCH_OR_SKIP] = 1 + 1,
[ASN1_OP_COND_MATCH_ACT_OR_SKIP] = 1 + 1 + 1,
[ASN1_OP_COND_MATCH_JUMP_OR_SKIP] = 1 + 1 + 1,
[ASN1_OP_COND_MATCH_ANY] = 1,
[ASN1_OP_COND_MATCH_ANY_OR_SKIP] = 1,
[ASN1_OP_COND_MATCH_ANY_ACT] = 1 + 1,
[ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP] = 1 + 1,
[ASN1_OP_COND_FAIL] = 1,
[ASN1_OP_COMPLETE] = 1,
[ASN1_OP_ACT] = 1 + 1,
[ASN1_OP_MAYBE_ACT] = 1 + 1,
[ASN1_OP_RETURN] = 1,
[ASN1_OP_END_SEQ] = 1,
[ASN1_OP_END_SEQ_OF] = 1 + 1,
[ASN1_OP_END_SET] = 1,
[ASN1_OP_END_SET_OF] = 1 + 1,
[ASN1_OP_END_SEQ_ACT] = 1 + 1,
[ASN1_OP_END_SEQ_OF_ACT] = 1 + 1 + 1,
[ASN1_OP_END_SET_ACT] = 1 + 1,
[ASN1_OP_END_SET_OF_ACT] = 1 + 1 + 1,
};
/*
* Find the length of an indefinite length object
* @data: The data buffer
* @datalen: The end of the innermost containing element in the buffer
* @_dp: The data parse cursor (updated before returning)
* @_len: Where to return the size of the element.
* @_errmsg: Where to return a pointer to an error message on error
*/
static int asn1_find_indefinite_length(const unsigned char *data, size_t datalen,
size_t *_dp, size_t *_len,
const char **_errmsg)
{
unsigned char tag, tmp;
size_t dp = *_dp, len, n;
int indef_level = 1;
next_tag:
if (unlikely(datalen - dp < 2)) {
if (datalen == dp)
goto missing_eoc;
goto data_overrun_error;
}
/* Extract a tag from the data */
tag = data[dp++];
if (tag == ASN1_EOC) {
/* It appears to be an EOC. */
if (data[dp++] != 0)
goto invalid_eoc;
if (--indef_level <= 0) {
*_len = dp - *_dp;
*_dp = dp;
return 0;
}
goto next_tag;
}
if (unlikely((tag & 0x1f) == ASN1_LONG_TAG)) {
do {
if (unlikely(datalen - dp < 2))
goto data_overrun_error;
tmp = data[dp++];
} while (tmp & 0x80);
}
/* Extract the length */
len = data[dp++];
if (len <= 0x7f)
goto check_length;
if (unlikely(len == ASN1_INDEFINITE_LENGTH)) {
/* Indefinite length */
if (unlikely((tag & ASN1_CONS_BIT) == ASN1_PRIM << 5))
goto indefinite_len_primitive;
indef_level++;
goto next_tag;
}
n = len - 0x80;
if (unlikely(n > sizeof(len) - 1))
goto length_too_long;
if (unlikely(n > datalen - dp))
goto data_overrun_error;
len = 0;
for (; n > 0; n--) {
len <<= 8;
len |= data[dp++];
}
check_length:
if (len > datalen - dp)
goto data_overrun_error;
dp += len;
goto next_tag;
length_too_long:
*_errmsg = "Unsupported length";
goto error;
indefinite_len_primitive:
*_errmsg = "Indefinite len primitive not permitted";
goto error;
invalid_eoc:
*_errmsg = "Invalid length EOC";
goto error;
data_overrun_error:
*_errmsg = "Data overrun error";
goto error;
missing_eoc:
*_errmsg = "Missing EOC in indefinite len cons";
error:
*_dp = dp;
return -1;
}
/**
* asn1_ber_decoder - Decoder BER/DER/CER ASN.1 according to pattern
* @decoder: The decoder definition (produced by asn1_compiler)
* @context: The caller's context (to be passed to the action functions)
* @data: The encoded data
* @datalen: The size of the encoded data
*
* Decode BER/DER/CER encoded ASN.1 data according to a bytecode pattern
* produced by asn1_compiler. Action functions are called on marked tags to
* allow the caller to retrieve significant data.
*
* LIMITATIONS:
*
* To keep down the amount of stack used by this function, the following limits
* have been imposed:
*
* (1) This won't handle datalen > 65535 without increasing the size of the
* cons stack elements and length_too_long checking.
*
* (2) The stack of constructed types is 10 deep. If the depth of non-leaf
* constructed types exceeds this, the decode will fail.
*
* (3) The SET type (not the SET OF type) isn't really supported as tracking
* what members of the set have been seen is a pain.
*/
int asn1_ber_decoder(const struct asn1_decoder *decoder,
void *context,
const unsigned char *data,
size_t datalen)
{
const unsigned char *machine = decoder->machine;
const asn1_action_t *actions = decoder->actions;
size_t machlen = decoder->machlen;
enum asn1_opcode op;
unsigned char tag = 0, csp = 0, jsp = 0, optag = 0, hdr = 0;
const char *errmsg;
size_t pc = 0, dp = 0, tdp = 0, len = 0;
int ret;
unsigned char flags = 0;
#define FLAG_INDEFINITE_LENGTH 0x01
#define FLAG_MATCHED 0x02
#define FLAG_LAST_MATCHED 0x04 /* Last tag matched */
#define FLAG_CONS 0x20 /* Corresponds to CONS bit in the opcode tag
* - ie. whether or not we are going to parse
* a compound type.
*/
#define NR_CONS_STACK 10
unsigned short cons_dp_stack[NR_CONS_STACK];
unsigned short cons_datalen_stack[NR_CONS_STACK];
unsigned char cons_hdrlen_stack[NR_CONS_STACK];
#define NR_JUMP_STACK 10
unsigned char jump_stack[NR_JUMP_STACK];
if (datalen > 65535)
return -EMSGSIZE;
next_op:
pr_debug("next_op: pc=\e[32m%zu\e[m/%zu dp=\e[33m%zu\e[m/%zu C=%d J=%d\n",
pc, machlen, dp, datalen, csp, jsp);
if (unlikely(pc >= machlen))
goto machine_overrun_error;
op = machine[pc];
if (unlikely(pc + asn1_op_lengths[op] > machlen))
goto machine_overrun_error;
/* If this command is meant to match a tag, then do that before
* evaluating the command.
*/
if (op <= ASN1_OP__MATCHES_TAG) {
unsigned char tmp;
/* Skip conditional matches if possible */
if ((op & ASN1_OP_MATCH__COND && flags & FLAG_MATCHED) ||
(op & ASN1_OP_MATCH__SKIP && dp == datalen)) {
flags &= ~FLAG_LAST_MATCHED;
pc += asn1_op_lengths[op];
goto next_op;
}
flags = 0;
hdr = 2;
/* Extract a tag from the data */
if (unlikely(datalen - dp < 2))
goto data_overrun_error;
tag = data[dp++];
if (unlikely((tag & 0x1f) == ASN1_LONG_TAG))
goto long_tag_not_supported;
if (op & ASN1_OP_MATCH__ANY) {
pr_debug("- any %02x\n", tag);
} else {
/* Extract the tag from the machine
* - Either CONS or PRIM are permitted in the data if
* CONS is not set in the op stream, otherwise CONS
* is mandatory.
*/
optag = machine[pc + 1];
flags |= optag & FLAG_CONS;
/* Determine whether the tag matched */
tmp = optag ^ tag;
tmp &= ~(optag & ASN1_CONS_BIT);
pr_debug("- match? %02x %02x %02x\n", tag, optag, tmp);
if (tmp != 0) {
/* All odd-numbered tags are MATCH_OR_SKIP. */
if (op & ASN1_OP_MATCH__SKIP) {
pc += asn1_op_lengths[op];
dp--;
goto next_op;
}
goto tag_mismatch;
}
}
flags |= FLAG_MATCHED;
len = data[dp++];
if (len > 0x7f) {
if (unlikely(len == ASN1_INDEFINITE_LENGTH)) {
/* Indefinite length */
if (unlikely(!(tag & ASN1_CONS_BIT)))
goto indefinite_len_primitive;
flags |= FLAG_INDEFINITE_LENGTH;
if (unlikely(2 > datalen - dp))
goto data_overrun_error;
} else {
int n = len - 0x80;
if (unlikely(n > 2))
goto length_too_long;
if (unlikely(n > datalen - dp))
goto data_overrun_error;
hdr += n;
for (len = 0; n > 0; n--) {
len <<= 8;
len |= data[dp++];
}
if (unlikely(len > datalen - dp))
goto data_overrun_error;
}
} else {
if (unlikely(len > datalen - dp))
goto data_overrun_error;
}
if (flags & FLAG_CONS) {
/* For expected compound forms, we stack the positions
* of the start and end of the data.
*/
if (unlikely(csp >= NR_CONS_STACK))
goto cons_stack_overflow;
cons_dp_stack[csp] = dp;
cons_hdrlen_stack[csp] = hdr;
if (!(flags & FLAG_INDEFINITE_LENGTH)) {
cons_datalen_stack[csp] = datalen;
datalen = dp + len;
} else {
cons_datalen_stack[csp] = 0;
}
csp++;
}
pr_debug("- TAG: %02x %zu%s\n",
tag, len, flags & FLAG_CONS ? " CONS" : "");
tdp = dp;
}
/* Decide how to handle the operation */
switch (op) {
case ASN1_OP_MATCH:
case ASN1_OP_MATCH_OR_SKIP:
case ASN1_OP_MATCH_ACT:
case ASN1_OP_MATCH_ACT_OR_SKIP:
case ASN1_OP_MATCH_ANY:
case ASN1_OP_MATCH_ANY_OR_SKIP:
case ASN1_OP_MATCH_ANY_ACT:
case ASN1_OP_MATCH_ANY_ACT_OR_SKIP:
case ASN1_OP_COND_MATCH_OR_SKIP:
case ASN1_OP_COND_MATCH_ACT_OR_SKIP:
case ASN1_OP_COND_MATCH_ANY:
case ASN1_OP_COND_MATCH_ANY_OR_SKIP:
case ASN1_OP_COND_MATCH_ANY_ACT:
case ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP:
if (!(flags & FLAG_CONS)) {
if (flags & FLAG_INDEFINITE_LENGTH) {
size_t tmp = dp;
ret = asn1_find_indefinite_length(
data, datalen, &tmp, &len, &errmsg);
if (ret < 0)
goto error;
}
pr_debug("- LEAF: %zu\n", len);
}
if (op & ASN1_OP_MATCH__ACT) {
unsigned char act;
if (op & ASN1_OP_MATCH__ANY)
act = machine[pc + 1];
else
act = machine[pc + 2];
ret = actions[act](context, hdr, tag, data + dp, len);
if (ret < 0)
return ret;
}
if (!(flags & FLAG_CONS))
dp += len;
pc += asn1_op_lengths[op];
goto next_op;
case ASN1_OP_MATCH_JUMP:
case ASN1_OP_MATCH_JUMP_OR_SKIP:
case ASN1_OP_COND_MATCH_JUMP_OR_SKIP:
pr_debug("- MATCH_JUMP\n");
if (unlikely(jsp == NR_JUMP_STACK))
goto jump_stack_overflow;
jump_stack[jsp++] = pc + asn1_op_lengths[op];
pc = machine[pc + 2];
goto next_op;
case ASN1_OP_COND_FAIL:
if (unlikely(!(flags & FLAG_MATCHED)))
goto tag_mismatch;
pc += asn1_op_lengths[op];
goto next_op;
case ASN1_OP_COMPLETE:
if (unlikely(jsp != 0 || csp != 0)) {
pr_err("ASN.1 decoder error: Stacks not empty at completion (%u, %u)\n",
jsp, csp);
return -EBADMSG;
}
return 0;
case ASN1_OP_END_SET:
case ASN1_OP_END_SET_ACT:
if (unlikely(!(flags & FLAG_MATCHED)))
goto tag_mismatch;
/* fall through */
case ASN1_OP_END_SEQ:
case ASN1_OP_END_SET_OF:
case ASN1_OP_END_SEQ_OF:
case ASN1_OP_END_SEQ_ACT:
case ASN1_OP_END_SET_OF_ACT:
case ASN1_OP_END_SEQ_OF_ACT:
if (unlikely(csp <= 0))
goto cons_stack_underflow;
csp--;
tdp = cons_dp_stack[csp];
hdr = cons_hdrlen_stack[csp];
len = datalen;
datalen = cons_datalen_stack[csp];
pr_debug("- end cons t=%zu dp=%zu l=%zu/%zu\n",
tdp, dp, len, datalen);
if (datalen == 0) {
/* Indefinite length - check for the EOC. */
datalen = len;
if (unlikely(datalen - dp < 2))
goto data_overrun_error;
if (data[dp++] != 0) {
if (op & ASN1_OP_END__OF) {
dp--;
csp++;
pc = machine[pc + 1];
pr_debug("- continue\n");
goto next_op;
}
goto missing_eoc;
}
if (data[dp++] != 0)
goto invalid_eoc;
len = dp - tdp - 2;
} else {
if (dp < len && (op & ASN1_OP_END__OF)) {
datalen = len;
csp++;
pc = machine[pc + 1];
pr_debug("- continue\n");
goto next_op;
}
if (dp != len)
goto cons_length_error;
len -= tdp;
pr_debug("- cons len l=%zu d=%zu\n", len, dp - tdp);
}
if (op & ASN1_OP_END__ACT) {
unsigned char act;
if (op & ASN1_OP_END__OF)
act = machine[pc + 2];
else
act = machine[pc + 1];
ret = actions[act](context, hdr, 0, data + tdp, len);
if (ret < 0)
return ret;
}
pc += asn1_op_lengths[op];
goto next_op;
case ASN1_OP_MAYBE_ACT:
if (!(flags & FLAG_LAST_MATCHED)) {
pc += asn1_op_lengths[op];
goto next_op;
}
/* fall through */
case ASN1_OP_ACT:
ret = actions[machine[pc + 1]](context, hdr, tag, data + tdp, len);
if (ret < 0)
return ret;
pc += asn1_op_lengths[op];
goto next_op;
case ASN1_OP_RETURN:
if (unlikely(jsp <= 0))
goto jump_stack_underflow;
pc = jump_stack[--jsp];
flags |= FLAG_MATCHED | FLAG_LAST_MATCHED;
goto next_op;
default:
break;
}
/* Shouldn't reach here */
pr_err("ASN.1 decoder error: Found reserved opcode (%u) pc=%zu\n",
op, pc);
return -EBADMSG;
data_overrun_error:
errmsg = "Data overrun error";
goto error;
machine_overrun_error:
errmsg = "Machine overrun error";
goto error;
jump_stack_underflow:
errmsg = "Jump stack underflow";
goto error;
jump_stack_overflow:
errmsg = "Jump stack overflow";
goto error;
cons_stack_underflow:
errmsg = "Cons stack underflow";
goto error;
cons_stack_overflow:
errmsg = "Cons stack overflow";
goto error;
cons_length_error:
errmsg = "Cons length error";
goto error;
missing_eoc:
errmsg = "Missing EOC in indefinite len cons";
goto error;
invalid_eoc:
errmsg = "Invalid length EOC";
goto error;
length_too_long:
errmsg = "Unsupported length";
goto error;
indefinite_len_primitive:
errmsg = "Indefinite len primitive not permitted";
goto error;
tag_mismatch:
errmsg = "Unexpected tag";
goto error;
long_tag_not_supported:
errmsg = "Long tag not supported";
error:
pr_debug("\nASN1: %s [m=%zu d=%zu ot=%02x t=%02x l=%zu]\n",
errmsg, pc, dp, optag, tag, len);
return -EBADMSG;
}
EXPORT_SYMBOL_GPL(asn1_ber_decoder);
MODULE_LICENSE("GPL");
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