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xt_SYSRQ: use new shash crypto API

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The "shash" API is not exactly new (Linux 2.6.27), but the "hash" API
was finally thrown out for Linux 4.6.
This commit is contained in:
Jan Engelhardt
2016-04-22 11:11:57 +02:00
parent e3114d60d5
commit 192243483a
1 changed files with 15 additions and 17 deletions
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32
extensions/xt_SYSRQ.c
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@@ -1,6 +1,6 @@
/*
* "SYSRQ" target extension for Xtables
* Copyright © Jan Engelhardt, 2008 - 2012
* Copyright Jan Engelhardt, 2016
*
* Based upon the ipt_SYSRQ idea by Marek Zalem <marek [at] terminus sk>
*
@@ -21,8 +21,7 @@
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/crypto.h>
#include <linux/scatterlist.h>
#include <crypto/hash.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include "compat_xtables.h"
@@ -50,7 +49,7 @@ MODULE_PARM_DESC(seqno, "sequence number for remote sysrq");
MODULE_PARM_DESC(debug, "debugging: 0=off, 1=on");
#ifdef WITH_CRYPTO
static struct crypto_hash *sysrq_tfm;
static struct crypto_shash *sysrq_tfm;
static int sysrq_digest_size;
static unsigned char *sysrq_digest_password;
static unsigned char *sysrq_digest;
@@ -75,8 +74,7 @@ static unsigned int sysrq_tg(const void *pdata, uint16_t len)
{
const char *data = pdata;
int i, n;
struct scatterlist sg[2];
struct hash_desc desc;
struct shash_desc desc;
int ret;
long new_seqno = 0;
@@ -117,15 +115,15 @@ static unsigned int sysrq_tg(const void *pdata, uint16_t len)
desc.tfm = sysrq_tfm;
desc.flags = 0;
ret = crypto_hash_init(&desc);
ret = crypto_shash_init(&desc);
if (ret != 0)
goto hash_fail;
sg_init_table(sg, 2);
sg_set_buf(&sg[0], data, n);
i = strlen(sysrq_digest_password);
sg_set_buf(&sg[1], sysrq_digest_password, i);
ret = crypto_hash_digest(&desc, sg, n + i, sysrq_digest);
if (ret != 0)
if (crypto_shash_update(&desc, data, n) != 0)
goto hash_fail;
if (crypto_shash_update(&desc, sysrq_digest_password,
strlen(sysrq_digest_password)) != 0)
goto hash_fail;
if (crypto_shash_final(&desc, sysrq_digest) != 0)
goto hash_fail;
for (i = 0; i < sysrq_digest_size; ++i) {
@@ -303,7 +301,7 @@ static void sysrq_crypto_exit(void)
{
#ifdef WITH_CRYPTO
if (sysrq_tfm)
crypto_free_hash(sysrq_tfm);
crypto_free_shash(sysrq_tfm);
if (sysrq_digest)
kfree(sysrq_digest);
if (sysrq_hexdigest)
@@ -319,7 +317,7 @@ static int __init sysrq_crypto_init(void)
struct timeval now;
int ret;
sysrq_tfm = crypto_alloc_hash(sysrq_hash, 0, CRYPTO_ALG_ASYNC);
sysrq_tfm = crypto_alloc_shash(sysrq_hash, 0, 0);
if (IS_ERR(sysrq_tfm)) {
printk(KERN_WARNING KBUILD_MODNAME
": Error: Could not find or load %s hash\n",
@@ -328,7 +326,7 @@ static int __init sysrq_crypto_init(void)
sysrq_tfm = NULL;
goto fail;
}
sysrq_digest_size = crypto_hash_digestsize(sysrq_tfm);
sysrq_digest_size = crypto_shash_digestsize(sysrq_tfm);
sysrq_digest = kmalloc(sysrq_digest_size, GFP_KERNEL);
ret = -ENOMEM;
if (sysrq_digest == NULL)
@@ -371,7 +369,7 @@ static void __exit sysrq_tg_exit(void)
module_init(sysrq_tg_init);
module_exit(sysrq_tg_exit);
MODULE_DESCRIPTION("Xtables: triggering SYSRQ remotely");
MODULE_AUTHOR("Jan Engelhardt ");
MODULE_AUTHOR("Jan Engelhardt");
MODULE_AUTHOR("John Haxby <john.haxby@oracle.com");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_SYSRQ");