Author: des
Date: Tue Nov 4 23:29:29 2014
New Revision: 274106
URL: https://svnweb.freebsd.org/changeset/base/274106
Log:
[SA-14:25] Fix kernel stack disclosure in setlogin(2) / getlogin(2).
[SA-14:26] Fix remote command execution in ftp(1).
Approved by: so (des)
Modified:
head/contrib/tnftp/src/fetch.c
head/sys/kern/kern_prot.c
Modified: head/contrib/tnftp/src/fetch.c
==============================================================================
--- head/contrib/tnftp/src/fetch.c Tue Nov 4 23:10:58 2014
(r274105)
+++ head/contrib/tnftp/src/fetch.c Tue Nov 4 23:29:29 2014
(r274106)
@@ -547,7 +547,7 @@ fetch_url(const char *url, const char *p
url_decode(decodedpath);
if (outfile)
- savefile = ftp_strdup(outfile);
+ savefile = outfile;
else {
cp = strrchr(decodedpath, '/'); /* find savefile */
if (cp != NULL)
@@ -571,8 +571,7 @@ fetch_url(const char *url, const char *p
rangestart = rangeend = entitylen = -1;
mtime = -1;
if (restartautofetch) {
- if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
- stat(savefile, &sb) == 0)
+ if (stat(savefile, &sb) == 0)
restart_point = sb.st_size;
}
if (urltype == FILE_URL_T) { /* file:// URLs */
@@ -1098,17 +1097,25 @@ fetch_url(const char *url, const char *p
} /* end of ftp:// or http:// specific setup */
/* Open the output file. */
- if (strcmp(savefile, "-") == 0) {
- fout = stdout;
- } else if (*savefile == '|') {
- oldintp = xsignal(SIGPIPE, SIG_IGN);
- fout = popen(savefile + 1, "w");
- if (fout == NULL) {
- warn("Can't execute `%s'", savefile + 1);
- goto cleanup_fetch_url;
+
+ /*
+ * Only trust filenames with special meaning if they came from
+ * the command line
+ */
+ if (outfile == savefile) {
+ if (strcmp(savefile, "-") == 0) {
+ fout = stdout;
+ } else if (*savefile == '|') {
+ oldintp = xsignal(SIGPIPE, SIG_IGN);
+ fout = popen(savefile + 1, "w");
+ if (fout == NULL) {
+ warn("Can't execute `%s'", savefile + 1);
+ goto cleanup_fetch_url;
+ }
+ closefunc = pclose;
}
- closefunc = pclose;
- } else {
+ }
+ if (fout == NULL) {
if ((rangeend != -1 && rangeend <= restart_point) ||
(rangestart == -1 && filesize != -1 && filesize <=
restart_point)) {
/* already done */
@@ -1318,7 +1325,8 @@ fetch_url(const char *url, const char *p
(*closefunc)(fout);
if (res0)
freeaddrinfo(res0);
- FREEPTR(savefile);
+ if (savefile != outfile)
+ FREEPTR(savefile);
FREEPTR(uuser);
if (pass != NULL)
memset(pass, 0, strlen(pass));
Modified: head/sys/kern/kern_prot.c
==============================================================================
--- head/sys/kern/kern_prot.c Tue Nov 4 23:10:58 2014 (r274105)
+++ head/sys/kern/kern_prot.c Tue Nov 4 23:29:29 2014 (r274106)
@@ -2066,21 +2066,20 @@ struct getlogin_args {
int
sys_getlogin(struct thread *td, struct getlogin_args *uap)
{
- int error;
char login[MAXLOGNAME];
struct proc *p = td->td_proc;
+ size_t len;
if (uap->namelen > MAXLOGNAME)
uap->namelen = MAXLOGNAME;
PROC_LOCK(p);
SESS_LOCK(p->p_session);
- bcopy(p->p_session->s_login, login, uap->namelen);
+ len = strlcpy(login, p->p_session->s_login, uap->namelen) + 1;
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
- if (strlen(login) + 1 > uap->namelen)
+ if (len > uap->namelen)
return (ERANGE);
- error = copyout(login, uap->namebuf, uap->namelen);
- return (error);
+ return (copyout(login, uap->namebuf, len));
}
/*
@@ -2099,21 +2098,23 @@ sys_setlogin(struct thread *td, struct s
int error;
char logintmp[MAXLOGNAME];
+ CTASSERT(sizeof(p->p_session->s_login) >= sizeof(logintmp));
+
error = priv_check(td, PRIV_PROC_SETLOGIN);
if (error)
return (error);
error = copyinstr(uap->namebuf, logintmp, sizeof(logintmp), NULL);
- if (error == ENAMETOOLONG)
- error = EINVAL;
- else if (!error) {
- PROC_LOCK(p);
- SESS_LOCK(p->p_session);
- (void) memcpy(p->p_session->s_login, logintmp,
- sizeof(logintmp));
- SESS_UNLOCK(p->p_session);
- PROC_UNLOCK(p);
+ if (error != 0) {
+ if (error == ENAMETOOLONG)
+ error = EINVAL;
+ return (error);
}
- return (error);
+ PROC_LOCK(p);
+ SESS_LOCK(p->p_session);
+ strcpy(p->p_session->s_login, logintmp);
+ SESS_UNLOCK(p->p_session);
+ PROC_UNLOCK(p);
+ return (0);
}
void
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