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* nis/nis_error.c (nis_sperror_r): Let snprintf determine whether

Browse Source 
there is an overflow.
	* nis/nss_nisplus/nisplus-netgrp.c (_nss_nisplus_setnetgrent):
	Rewrite to use snprintf.
	* nis/nss_nisplus/nisplus-publickey.c (_nss_nisplus_netname2user):
	Likewise.
This commit is contained in:
Ulrich Drepper 2005-12-03 22:15:54 +00:00
parent 636e689e6f
commit 8e64faef03
7 changed files with 68 additions and 88 deletions
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6
ChangeLog
View File

@ -1,5 +1,7 @@
2005-12-03 Ulrich Drepper <drepper@redhat.com>
* nis/nis_error.c (nis_sperror_r): Let snprintf determine whether
there is an overflow.
* nis/nss_nisplus/nisplus-service.c: Fix locking to use
_nss_create_tablename. Avoid unnecessary copying, remove
unnecessary variables, general cleanup.
@ -17,6 +19,10 @@
general cleanup.
* nis/nss_nisplus/nisplus-alias.c: Fix locking to use
_nss_create_tablename. Avoid unnecessary copying, general cleanup.
* nis/nss_nisplus/nisplus-netgrp.c (_nss_nisplus_setnetgrent):
Rewrite to use snprintf.
* nis/nss_nisplus/nisplus-publickey.c (_nss_nisplus_netname2user):
Likewise.
2005-12-02 Ulrich Drepper <drepper@redhat.com>

15
nis/nis_error.c
View File

@ -1,4 +1,4 @@
/* Copyright (c) 1997, 1998, 1999, 2004 Free Software Foundation, Inc.
/* Copyright (c) 1997, 1998, 1999, 2004, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
@ -102,26 +102,21 @@ char *
nis_sperror_r (const nis_error status, const char *label,
char *buffer, size_t buflen)
{
const char *cptr;
cptr = nis_sperrno (status);
if ((strlen (cptr) + strlen (label) + 3) > buflen)
if (snprintf (buffer, buflen, "%s: %s", label, nis_sperrno (status))
>= buflen)
{
errno = ERANGE;
return NULL;
}
sprintf (buffer, "%s: %s", label, cptr);
return buffer;
return buffer;
}
libnsl_hidden_def (nis_sperror_r)
char *
nis_sperror (const nis_error status, const char *label)
{
static char buffer[NIS_MAXNAMELEN +1];
static char buffer[NIS_MAXNAMELEN + 1];
return nis_sperror_r (status, label, buffer, sizeof (buffer));
}

88
nis/nss_nisplus/nisplus-ethers.c
View File

@ -156,8 +156,6 @@ static enum nss_status
internal_nisplus_getetherent_r (struct etherent *ether, char *buffer,
size_t buflen, int *errnop)
{
int parse_res;
if (tablename_val == NULL)
{
enum nss_status status = _nss_create_tablename (errnop);
@ -167,6 +165,7 @@ internal_nisplus_getetherent_r (struct etherent *ether, char *buffer,
}
/* Get the next entry until we found a correct one. */
int parse_res;
do
{
nis_result *saved_result;
@ -180,11 +179,8 @@ internal_nisplus_getetherent_r (struct etherent *ether, char *buffer,
}
else
{
nis_result *res2;
res2 = nis_next_entry(tablename_val, &result->cookie);
saved_result = result;
result = res2;
result = nis_next_entry (tablename_val, &result->cookie);
if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
{
nis_freeresult (saved_result);
@ -200,13 +196,12 @@ internal_nisplus_getetherent_r (struct etherent *ether, char *buffer,
result = saved_result;
return NSS_STATUS_TRYAGAIN;
}
else
{
if (saved_result != NULL)
nis_freeresult (saved_result);
}
} while (!parse_res);
if (saved_result != NULL)
nis_freeresult (saved_result);
}
while (!parse_res);
return NSS_STATUS_SUCCESS;
}
@ -230,8 +225,6 @@ enum nss_status
_nss_nisplus_gethostton_r (const char *name, struct etherent *eth,
char *buffer, size_t buflen, int *errnop)
{
int parse_res;
if (tablename_val == NULL)
{
enum nss_status status = _nss_create_tablename (errnop);
@ -245,49 +238,47 @@ _nss_nisplus_gethostton_r (const char *name, struct etherent *eth,
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
else
char buf[strlen (name) + 9 + tablename_len];
int olderr = errno;
snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
if (result == NULL)
{
nis_result *result;
char buf[strlen (name) + 40 + tablename_len];
int olderr = errno;
*errnop = ENOMEM;
return NSS_STATUS_TRYAGAIN;
}
sprintf (buf, "[name=%s],%s", name, tablename_val);
if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
{
enum nss_status status = niserr2nss (result->status);
nis_freeresult (result);
return status;
}
result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
buflen, errnop);
if (__builtin_expect (parse_res < 1, 0))
{
__set_errno (olderr);
if (result == NULL)
if (parse_res == -1)
{
*errnop = ENOMEM;
nis_freeresult (result);
return NSS_STATUS_TRYAGAIN;
}
if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
{
enum nss_status status = niserr2nss (result->status);
nis_freeresult (result);
return status;
}
parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
buflen, errnop);
if (parse_res < 1)
{
__set_errno (olderr);
if (parse_res == -1)
{
nis_freeresult (result);
return NSS_STATUS_TRYAGAIN;
}
else
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
else
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nisplus_getntohost_r (const struct ether_addr *addr,
struct etherent *eth,
_nss_nisplus_getntohost_r (const struct ether_addr *addr, struct etherent *eth,
char *buffer, size_t buflen, int *errnop)
{
if (tablename_val == NULL)
@ -308,7 +299,6 @@ _nss_nisplus_getntohost_r (const struct ether_addr *addr,
return NSS_STATUS_UNAVAIL;
}
int parse_res;
char buf[26 + tablename_len];
snprintf (buf, sizeof (buf),
@ -334,8 +324,8 @@ _nss_nisplus_getntohost_r (const struct ether_addr *addr,
return status;
}
parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
buflen, errnop);
int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
buflen, errnop);
if (__builtin_expect (parse_res < 1, 0))
{
if (parse_res == -1)

7
nis/nss_nisplus/nisplus-netgrp.c
View File

@ -150,15 +150,14 @@ internal_endnetgrent (struct __netgrent *netgrp)
enum nss_status
_nss_nisplus_setnetgrent (const char *group, struct __netgrent *netgrp)
{
enum nss_status status;
char buf[strlen (group) + 30];
char buf[strlen (group) + 25];
if (group == NULL || group[0] == '\0')
return NSS_STATUS_UNAVAIL;
status = NSS_STATUS_SUCCESS;
enum nss_status status = NSS_STATUS_SUCCESS;
sprintf (buf, "[name=%s],netgroup.org_dir", group);
snprintf (buf, sizeof (buf), "[name=%s],netgroup.org_dir", group);
netgrp->data = (char *) nis_list (buf, EXPAND_NAME, NULL, NULL);

21
nis/nss_nisplus/nisplus-publickey.c
View File

@ -1,4 +1,4 @@
/* Copyright (c) 1997, 1999, 2001, 2003 Free Software Foundation, Inc.
/* Copyright (c) 1997, 1999, 2001, 2003, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
@ -37,7 +37,7 @@ _nss_nisplus_getpublickey (const char *netname, char *pkey, int *errnop)
{
nis_result *res;
enum nss_status retval;
char buf[NIS_MAXNAMELEN+2];
char buf[NIS_MAXNAMELEN + 2];
size_t slen;
char *domain, *cptr;
int len;
@ -120,7 +120,7 @@ _nss_nisplus_getsecretkey (const char *netname, char *skey, char *passwd,
{
nis_result *res;
enum nss_status retval;
char buf[NIS_MAXNAMELEN+2];
char buf[NIS_MAXNAMELEN + 2];
size_t slen;
char *domain, *cptr;
int len;
@ -154,7 +154,7 @@ _nss_nisplus_getsecretkey (const char *netname, char *skey, char *passwd,
buf[slen] = '\0';
}
res = nis_list (buf, USE_DGRAM+NO_AUTHINFO+FOLLOW_LINKS+FOLLOW_PATH,
res = nis_list (buf, USE_DGRAM | NO_AUTHINFO | FOLLOW_LINKS | FOLLOW_PATH,
NULL, NULL);
if (res == NULL)
@ -242,9 +242,9 @@ _nss_nisplus_netname2user (char netname[MAXNETNAMELEN + 1], uid_t *uidp,
{
char *domain;
nis_result *res;
char sname[NIS_MAXNAMELEN+2]; /* search criteria + table name */
char sname[NIS_MAXNAMELEN + 2]; /* search criteria + table name */
size_t slen;
char principal[NIS_MAXNAMELEN+1];
char principal[NIS_MAXNAMELEN + 1];
int len;
/* 1. Get home domain of user. */
@ -255,10 +255,6 @@ _nss_nisplus_netname2user (char netname[MAXNETNAMELEN + 1], uid_t *uidp,
++domain; /* skip '@' */
/* 2. Get user's nisplus principal name. */
if ((strlen (netname) + strlen (domain)+45) >
(size_t) NIS_MAXNAMELEN)
return NSS_STATUS_UNAVAIL;
slen = snprintf (sname, NIS_MAXNAMELEN,
"[auth_name=%s,auth_type=DES],cred.org_dir.%s",
netname, domain);
@ -339,8 +335,9 @@ _nss_nisplus_netname2user (char netname[MAXNETNAMELEN + 1], uid_t *uidp,
return NSS_STATUS_UNAVAIL;
}
slen = sprintf (sname, "[cname=%s,auth_type=LOCAL],cred.org_dir.%s",
principal, domain);
slen = snprintf (sname, sizeof (sname),
"[cname=%s,auth_type=LOCAL],cred.org_dir.%s",
principal, domain);
if (sname[slen - 1] != '.')
{

15
nis/nss_nisplus/nisplus-pwd.c
View File

@ -56,7 +56,12 @@ _nss_pwd_create_tablename (int *errnop)
atomic_write_barrier ();
pwd_tablename_val = p;
if (atomic_compare_and_exchange_bool_acq (&pwd_tablename_val, p, NULL))
{
/* Another thread already installed the value. */
free (p);
pwd_tablename_len = strlen (pwd_tablename_val);
}
}
return NSS_STATUS_SUCCESS;
@ -181,12 +186,8 @@ _nss_nisplus_getpwnam_r (const char *name, struct passwd *pw,
if (pwd_tablename_val == NULL)
{
__libc_lock_lock (lock);
enum nss_status status = _nss_pwd_create_tablename (errnop);
__libc_lock_unlock (lock);
if (status != NSS_STATUS_SUCCESS)
return status;
}
@ -248,12 +249,8 @@ _nss_nisplus_getpwuid_r (const uid_t uid, struct passwd *pw,
{
if (pwd_tablename_val == NULL)
{
__libc_lock_lock (lock);
enum nss_status status = _nss_pwd_create_tablename (errnop);
__libc_lock_unlock (lock);
if (status != NSS_STATUS_SUCCESS)
return status;
}

4
nis/nss_nisplus/nisplus-spwd.c
View File

@ -154,12 +154,8 @@ _nss_nisplus_getspnam_r (const char *name, struct spwd *sp,
if (pwd_tablename_val == NULL)
{
__libc_lock_lock (lock);
enum nss_status status = _nss_pwd_create_tablename (errnop);
__libc_lock_unlock (lock);
if (status != NSS_STATUS_SUCCESS)
return status;
}