9a5467bf7b
Three errors resulting in kernel memory disclosure: 1/ The structures used for the netlink based crypto algorithm report API are located on the stack. As snprintf() does not fill the remainder of the buffer with null bytes, those stack bytes will be disclosed to users of the API. Switch to strncpy() to fix this. 2/ crypto_report_one() does not initialize all field of struct crypto_user_alg. Fix this to fix the heap info leak. 3/ For the module name we should copy only as many bytes as module_name() returns -- not as much as the destination buffer could hold. But the current code does not and therefore copies random data from behind the end of the module name, as the module name is always shorter than CRYPTO_MAX_ALG_NAME. Also switch to use strncpy() to copy the algorithm's name and driver_name. They are strings, after all. Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
120 lines
3 KiB
C
120 lines
3 KiB
C
/*
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* Cryptographic API.
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*
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* Partial (de)compression operations.
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*
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* Copyright 2008 Sony Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/crypto.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/cryptouser.h>
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#include <net/netlink.h>
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#include <crypto/compress.h>
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#include <crypto/internal/compress.h>
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#include "internal.h"
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static int crypto_pcomp_init(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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return 0;
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}
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static unsigned int crypto_pcomp_extsize(struct crypto_alg *alg)
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{
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return alg->cra_ctxsize;
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}
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static int crypto_pcomp_init_tfm(struct crypto_tfm *tfm)
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{
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return 0;
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}
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#ifdef CONFIG_NET
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static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_comp rpcomp;
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strncpy(rpcomp.type, "pcomp", sizeof(rpcomp.type));
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if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
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sizeof(struct crypto_report_comp), &rpcomp))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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#else
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static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
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{
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return -ENOSYS;
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}
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#endif
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static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
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{
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seq_printf(m, "type : pcomp\n");
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}
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static const struct crypto_type crypto_pcomp_type = {
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.extsize = crypto_pcomp_extsize,
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.init = crypto_pcomp_init,
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.init_tfm = crypto_pcomp_init_tfm,
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#ifdef CONFIG_PROC_FS
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.show = crypto_pcomp_show,
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#endif
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.report = crypto_pcomp_report,
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_MASK,
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.type = CRYPTO_ALG_TYPE_PCOMPRESS,
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.tfmsize = offsetof(struct crypto_pcomp, base),
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};
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struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
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u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_pcomp);
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int crypto_register_pcomp(struct pcomp_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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base->cra_type = &crypto_pcomp_type;
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base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
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base->cra_flags |= CRYPTO_ALG_TYPE_PCOMPRESS;
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return crypto_register_alg(base);
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}
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EXPORT_SYMBOL_GPL(crypto_register_pcomp);
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int crypto_unregister_pcomp(struct pcomp_alg *alg)
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{
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return crypto_unregister_alg(&alg->base);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_pcomp);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Partial (de)compression type");
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MODULE_AUTHOR("Sony Corporation");
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