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Use IFNAMSIZ instead of a magic value for the length of an interface

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name.

Prevent the kernel from potentially overflowing the interface name
variable.  The size argument of strlcpy is complex because the name is
not null-terminated in sdl_data.
This commit is contained in:
Brooks Davis 2004-01-27 01:43:14 +00:00
parent 37c2cbe308
commit a4fa9864bf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=125060
2 changed files with 5 additions and 4 deletions
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7
sbin/ifconfig/ifconfig.c
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@ -113,7 +113,7 @@ struct in6_aliasreq in6_addreq =
struct sockaddr_in netmask;
struct netrange at_nr; /* AppleTalk net range */
char name[32];
char name[IFNAMSIZ];
int flags;
int setaddr;
int setipdst;
@ -596,8 +596,9 @@ main(int argc, char *argv[])
addrcount++;
next += nextifm->ifm_msglen;
}
strncpy(name, sdl->sdl_data, sdl->sdl_nlen);
name[sdl->sdl_nlen] = '\0';
strlcpy(name, sdl->sdl_data,
sizeof(name) <= sdl->sdl_nlen ?
sizeof(name) : sdl->sdl_nlen + 1);
if (all || namesonly) {
if (uponly)

2
sbin/ifconfig/ifconfig.h
View File

@ -36,7 +36,7 @@
extern struct ifreq ifr;
extern char name[32]; /* name of interface */
extern char name[IFNAMSIZ]; /* name of interface */
extern int allmedia;
extern int supmedia;
struct afswtch;