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phonet: some signedness bugs 

Dan Rosenberg pointed out that there were some signed comparison bugs
in the phonet protocol.

http://marc.info/?l=full-disclosure&m=129424528425330&w=2

The problem is that we check for array overflows but "protocol" is
signed and we don't check for array underflows.  If you have already
have CAP_SYS_ADMIN then you could use the bugs to get root, or someone
could cause an oops by mistake.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2011-01-10 04:06:58 +00:00 committed by David S. Miller
parent c599bd6b9a
commit facb4edc1e
2 changed files with 5 additions and 5 deletions
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4
include/net/phonet/phonet.h
View File

@ -107,8 +107,8 @@ struct phonet_protocol {
int sock_type;
};
int phonet_proto_register(int protocol, struct phonet_protocol *pp);
void phonet_proto_unregister(int protocol, struct phonet_protocol *pp);
int phonet_proto_register(unsigned int protocol, struct phonet_protocol *pp);
void phonet_proto_unregister(unsigned int protocol, struct phonet_protocol *pp);
int phonet_sysctl_init(void);
void phonet_sysctl_exit(void);

6
net/phonet/af_phonet.c
View File

@ -37,7 +37,7 @@
/* Transport protocol registration */
static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
static struct phonet_protocol *phonet_proto_get(int protocol)
static struct phonet_protocol *phonet_proto_get(unsigned int protocol)
{
struct phonet_protocol *pp;
@ -458,7 +458,7 @@ static struct packet_type phonet_packet_type __read_mostly = {
static DEFINE_MUTEX(proto_tab_lock);
int __init_or_module phonet_proto_register(int protocol,
int __init_or_module phonet_proto_register(unsigned int protocol,
struct phonet_protocol *pp)
{
int err = 0;
@ -481,7 +481,7 @@ int __init_or_module phonet_proto_register(int protocol,
}
EXPORT_SYMBOL(phonet_proto_register);
void phonet_proto_unregister(int protocol, struct phonet_protocol *pp)
void phonet_proto_unregister(unsigned int protocol, struct phonet_protocol *pp)
{
mutex_lock(&proto_tab_lock);
BUG_ON(proto_tab[protocol] != pp);