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Use strlcpy in create_unix_sockaddr()

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Using strncpy meant that if listenaddress were ever >=
sizeof(sockaddr_un.sun_path), we would fail to nul-terminate
sun_path.  This isn't a big deal: we never read sun_path, and the
kernel is smart enough to reject the sockaddr_un if it isn't
nul-terminated.  Nonetheless, it's a dumb failure mode.  Instead, we
should reject addresses that don't fit in sockaddr_un.sun_path.

Coverity found this; it's CID 428.  Bugfix on 0.2.0.3-alpha.
This commit is contained in:
Nick Mathewson 2011-07-01 12:06:54 -04:00
parent 46297bc7bd
commit 959da6b7f2
2 changed files with 12 additions and 1 deletions
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5
changes/cid_428 Normal file
View File

@ -0,0 +1,5 @@
o Minor bugfixes:
- Always NUL-terminate the sun_path field of a sockaddr_un before
passing it to the kernel. (Not a security issue: kernels are
smart enough to reject bad sockaddr_uns.) Found by Coverity; CID
# 428. Bugfix on Tor 0.2.0.3-alpha.

8
src/or/connection.c
View File

@ -804,7 +804,13 @@ create_unix_sockaddr(const char *listenaddress, char **readable_address,
sockaddr = tor_malloc_zero(sizeof(struct sockaddr_un));
sockaddr->sun_family = AF_UNIX;
strncpy(sockaddr->sun_path, listenaddress, sizeof(sockaddr->sun_path));
if (strlcpy(sockaddr->sun_path, listenaddress, sizeof(sockaddr->sun_path))
>= sizeof(sockaddr->sun_path)) {
log_warn(LD_CONFIG, "Unix socket path '%s' is too long to fit.",
escaped(listenaddress));
tor_free(sockaddr);
return NULL;
}
if (readable_address)
*readable_address = tor_strdup(listenaddress);