ce8614a312
Reference counters should use refcount_t rather than atomic_t, since the refcount_t implementation can prevent overflows, reducing the exploitability of reference leak bugs. crypto_alg.cra_refcount is a reference counter with the usual semantics, so switch it over to refcount_t. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/*
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* Scatterlist Cryptographic API.
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*
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* Procfs information.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/atomic.h>
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#include <linux/init.h>
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#include <linux/crypto.h>
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#include <linux/module.h> /* for module_name() */
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#include <linux/rwsem.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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down_read(&crypto_alg_sem);
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return seq_list_start(&crypto_alg_list, *pos);
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}
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static void *c_next(struct seq_file *m, void *p, loff_t *pos)
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{
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return seq_list_next(p, &crypto_alg_list, pos);
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}
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static void c_stop(struct seq_file *m, void *p)
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{
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up_read(&crypto_alg_sem);
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}
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static int c_show(struct seq_file *m, void *p)
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{
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struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
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seq_printf(m, "name : %s\n", alg->cra_name);
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seq_printf(m, "driver : %s\n", alg->cra_driver_name);
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seq_printf(m, "module : %s\n", module_name(alg->cra_module));
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seq_printf(m, "priority : %d\n", alg->cra_priority);
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seq_printf(m, "refcnt : %u\n", refcount_read(&alg->cra_refcnt));
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seq_printf(m, "selftest : %s\n",
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(alg->cra_flags & CRYPTO_ALG_TESTED) ?
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"passed" : "unknown");
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seq_printf(m, "internal : %s\n",
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(alg->cra_flags & CRYPTO_ALG_INTERNAL) ?
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"yes" : "no");
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if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
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seq_printf(m, "type : larval\n");
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seq_printf(m, "flags : 0x%x\n", alg->cra_flags);
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goto out;
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}
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if (alg->cra_type && alg->cra_type->show) {
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alg->cra_type->show(m, alg);
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goto out;
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}
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switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
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case CRYPTO_ALG_TYPE_CIPHER:
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seq_printf(m, "type : cipher\n");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "min keysize : %u\n",
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alg->cra_cipher.cia_min_keysize);
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seq_printf(m, "max keysize : %u\n",
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alg->cra_cipher.cia_max_keysize);
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break;
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case CRYPTO_ALG_TYPE_COMPRESS:
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seq_printf(m, "type : compression\n");
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break;
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default:
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seq_printf(m, "type : unknown\n");
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break;
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}
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out:
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seq_putc(m, '\n');
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return 0;
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}
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static const struct seq_operations crypto_seq_ops = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = c_show
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};
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static int crypto_info_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &crypto_seq_ops);
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}
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static const struct file_operations proc_crypto_ops = {
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.open = crypto_info_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release
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};
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void __init crypto_init_proc(void)
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{
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proc_create("crypto", 0, NULL, &proc_crypto_ops);
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}
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void __exit crypto_exit_proc(void)
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{
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remove_proc_entry("crypto", NULL);
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}
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