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netlink: add a basic parser of NETLINK_CRYPTO messages

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* netlink_crypto.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (decode_netlink_crypto): New prototype.
* netlink.c (netlink_decoders): Add NETLINK_CRYPTO.
* NEWS: Mention this.
This commit is contained in:
JingPiao Chen 2017-07-20 15:55:22 +08:00 committed by Dmitry V. Levin
parent 3754255061
commit 9da72b5251
5 changed files with 86 additions and 0 deletions
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1
Makefile.am
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@ -183,6 +183,7 @@ strace_SOURCES = \
net.c \
netlink.c \
netlink.h \
netlink_crypto.c \
netlink_sock_diag.h \
netlink_inet_diag.c \
netlink_netlink_diag.c \

1
NEWS
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@ -18,6 +18,7 @@ Noteworthy changes in release ?.?? (????-??-??)
* Implemented NETLINK_SELINUX protocol specific decoding.
* Implemented decoding of netlink message ack flags.
* Implemented decoding of nlmsgerr netlink attributes.
* Implemented basic protocol specific decoding of NETLINK_CRYPTO.
* Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
* Added decoding of arch_prctl syscall on x86.

1
defs.h
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@ -711,6 +711,7 @@ typedef bool (*netlink_decoder_t)(struct tcb *, const struct nlmsghdr *,
extern bool \
decode_netlink_ ## name(struct tcb *, const struct nlmsghdr *, \
kernel_ulong_t addr, unsigned int len)
DECL_NETLINK(crypto);
DECL_NETLINK(selinux);
DECL_NETLINK(sock_diag);

3
netlink.c
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@ -380,6 +380,9 @@ decode_nlmsgerr(struct tcb *const tcp,
}
static const netlink_decoder_t netlink_decoders[] = {
#ifdef HAVE_LINUX_CRYPTOUSER_H
[NETLINK_CRYPTO] = decode_netlink_crypto,
#endif
[NETLINK_SELINUX] = decode_netlink_selinux,
[NETLINK_SOCK_DIAG] = decode_netlink_sock_diag
};

80
netlink_crypto.c Normal file
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@ -0,0 +1,80 @@
/*
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2017 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "defs.h"
#ifdef HAVE_LINUX_CRYPTOUSER_H
# include "netlink.h"
# include "nlattr.h"
# include "print_fields.h"
# include <linux/cryptouser.h>
static void
decode_crypto_user_alg(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len)
{
struct crypto_user_alg alg;
if (len < sizeof(alg))
printstrn(tcp, addr, len);
else if (!umove_or_printaddr(tcp, addr, &alg)) {
PRINT_FIELD_CSTRING("{", alg, cru_name);
PRINT_FIELD_CSTRING(", ", alg, cru_driver_name);
PRINT_FIELD_CSTRING(", ", alg, cru_module_name);
PRINT_FIELD_X(", ", alg, cru_type);
PRINT_FIELD_X(", ", alg, cru_mask);
PRINT_FIELD_U(", ", alg, cru_refcnt);
PRINT_FIELD_X(", ", alg, cru_flags);
tprints("}");
}
}
bool
decode_netlink_crypto(struct tcb *const tcp,
const struct nlmsghdr *const nlmsghdr,
const kernel_ulong_t addr,
const unsigned int len)
{
switch (nlmsghdr->nlmsg_type) {
case CRYPTO_MSG_NEWALG:
case CRYPTO_MSG_DELALG:
case CRYPTO_MSG_UPDATEALG:
case CRYPTO_MSG_GETALG:
decode_crypto_user_alg(tcp, addr, len);
break;
default:
return false;
}
return true;
}
#endif /* HAVE_LINUX_CRYPTOUSER_H */