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NSS: Replace exported NSS lookup functions with stubs [BZ #21962]
Commit 384ca55174 from 2007 added this to
nss/XXX-lookup.c:
+#ifndef NO_COMPAT
+int
+internal_function attribute_compat_text_section
+DB_COMPAT_FCT (service_user **ni, const char *fct_name, void **fctp)
+{
+ return DB_LOOKUP_FCT (ni, fct_name, NULL, fctp);
+}
+#endif
That is, it adds a pseudo-compat function with an internal_function
attribute. The function it was supposed to replace did not have the
attribute:
extern int DB_LOOKUP_FCT (service_user **ni, const char *fct_name,
- void **fctp) internal_function;
+ const char *fct2_name, void **fctp)
+ internal_function;
This changed the calling convention on i386 for the following
functions in the public ABI:
__nss_passwd_lookup
__nss_group_lookup
__nss_hosts_lookup
This commit replaces the functions with always-failing stubs,
with true compat symbols. Due to a happy accident, the calling
convention of the stub is identical for the internal_function
and non-internal_function case on i386.
In addition, this commit auto-generates the __nss_*_lookup2
function declarations as part of <nsswitch.h>.
This commit is contained in:
Florian Weimer
parent
2a124c6163
commit
c88ffc239e
26
ChangeLog
26
ChangeLog
@ -1,3 +1,29 @@
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2017-08-14 Florian Weimer <fweimer@redhat.com>
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[BZ #21962]
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NSS: Create stubs for accidentally exported lookup functions.
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* grp/initgroups.c (__nss_group_lookup, __nss_lookup_function):
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Remove declaration.
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* inet/ether_hton.c (__nss_ethers_lookup): Likewise.
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(ether_hostton): Call __nss_ethers_lookup2 instead.
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* inet/ether_ntoh.c (__nss_ethers_lookup): Remove declaration.
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(ether_ntohost): Call __nss_ethers_lookup2 instead.
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* inet/getnetgrent_r.c (__nss_netgroup_lookup): Remove declaration.
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(setup): Call __nss_netgroup_lookup2 instead.
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* nss/Makefile (routines): Add compat-lookup.
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* nss/Versions (GLIBC_2.27): Add symbol version.
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* nss/XXX-lookup (DB_LOOKUP_FCT): Remove declaration. Now provided by <nsswitch.h>.
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(DB_COMPAT_FCT): Remove.
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* nss/compat-lookup.c: New file.
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* nss/nsswitch.h: Generate __nss_*_lookup2 function prototypes
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from databases.def.
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* nss/service-lookup.c (NO_COMPAT): Remove definition.
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* sunrpc/netname.c (__nss_publickey_lookup): Remove declaration.
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(netname2user): Call __nss_publickey_lookup2 instead.
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* sunrpc/publickey.c (__nss_publickey_lookup): Remove declaration.
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(getpublickey, getsecretkey): Call __nss_publickey_lookup2
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instead.
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2017-08-14 Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Sergei Trofimovich <slyfox@inbox.ru>
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@ -36,11 +36,6 @@ typedef enum nss_status (*initgroups_dyn_function) (const char *, gid_t,
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long int *, long int *,
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gid_t **, long int, int *);
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/* The lookup function for the first entry of this service. */
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extern int __nss_group_lookup (service_user **nip, const char *name,
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void **fctp);
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extern void *__nss_lookup_function (service_user *ni, const char *fct_name);
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extern service_user *__nss_group_database attribute_hidden;
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service_user *__nss_initgroups_database;
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static bool use_initgroups_entry;
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@ -27,11 +27,6 @@
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typedef int (*lookup_function) (const char *, struct etherent *, char *, int,
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int *);
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/* The lookup function for the first entry of this service. */
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extern int __nss_ethers_lookup (service_user **nip, const char *name,
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void **fctp) internal_function;
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int
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ether_hostton (const char *hostname, struct ether_addr *addr)
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{
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@ -49,7 +44,7 @@ ether_hostton (const char *hostname, struct ether_addr *addr)
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if (startp == NULL)
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{
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no_more = __nss_ethers_lookup (&nip, "gethostton_r", &fct.ptr);
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no_more = __nss_ethers_lookup2 (&nip, "gethostton_r", NULL, &fct.ptr);
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if (no_more)
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startp = (service_user *) -1;
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else
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@ -28,11 +28,6 @@
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typedef int (*lookup_function) (const struct ether_addr *, struct etherent *,
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char *, size_t, int *);
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/* The lookup function for the first entry of this service. */
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extern int __nss_ethers_lookup (service_user **nip, const char *name,
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void **fctp) internal_function;
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int
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ether_ntohost (char *hostname, const struct ether_addr *addr)
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{
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@ -50,7 +45,7 @@ ether_ntohost (char *hostname, const struct ether_addr *addr)
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if (startp == NULL)
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{
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no_more = __nss_ethers_lookup (&nip, "getntohost_r", &fct.ptr);
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no_more = __nss_ethers_lookup2 (&nip, "getntohost_r", NULL, &fct.ptr);
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if (no_more)
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startp = (service_user *) -1;
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else
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@ -36,10 +36,6 @@ __libc_lock_define_initialized (static, lock)
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kept in this structure. */
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static struct __netgrent dataset;
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/* The lookup function for the first entry of this service. */
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extern int __nss_netgroup_lookup (service_user **nipp, const char *name,
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void **fctp) internal_function;
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/* Set up NIP to run through the services. Return nonzero if there are no
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services (left). */
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static int
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@ -54,7 +50,7 @@ setup (void **fctp, service_user **nipp)
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{
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/* Executing this more than once at the same time must yield the
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same result every time. So we need no locking. */
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no_more = __nss_netgroup_lookup (nipp, "setnetgrent", fctp);
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no_more = __nss_netgroup_lookup2 (nipp, "setnetgrent", NULL, fctp);
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startp = no_more ? (service_user *) -1 : *nipp;
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#ifdef PTR_MANGLE
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PTR_MANGLE (startp);
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@ -27,7 +27,8 @@ headers := nss.h
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# This is the trivial part which goes into libc itself.
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routines = nsswitch getnssent getnssent_r digits_dots \
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valid_field valid_list_field rewrite_field \
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$(addsuffix -lookup,$(databases))
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$(addsuffix -lookup,$(databases)) \
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compat-lookup
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# These are the databases that go through nss dispatch.
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# Caution: if you add a database here, you must add its real name
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@ -7,6 +7,8 @@ libc {
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GLIBC_2.2.2 {
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__nss_hostname_digits_dots;
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}
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GLIBC_2.27 {
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}
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GLIBC_PRIVATE {
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_nss_files_parse_grent; _nss_files_parse_pwent; _nss_files_parse_spent;
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__nss_disable_nscd; __nss_lookup_function; _nss_files_parse_sgent;
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@ -34,7 +34,6 @@
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\*******************************************************************/
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#define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
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#define DB_COMPAT_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
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#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
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#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
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@ -55,10 +54,6 @@
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service_user *DATABASE_NAME_SYMBOL attribute_hidden;
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extern int DB_LOOKUP_FCT (service_user **ni, const char *fct_name,
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const char *fct2_name, void **fctp);
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libc_hidden_proto (DB_LOOKUP_FCT)
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int
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DB_LOOKUP_FCT (service_user **ni, const char *fct_name, const char *fct2_name,
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void **fctp)
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@ -73,13 +68,3 @@ DB_LOOKUP_FCT (service_user **ni, const char *fct_name, const char *fct2_name,
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return __nss_lookup (ni, fct_name, fct2_name, fctp);
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}
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libc_hidden_def (DB_LOOKUP_FCT)
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#ifndef NO_COMPAT
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int
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attribute_compat_text_section
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DB_COMPAT_FCT (service_user **ni, const char *fct_name, void **fctp)
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{
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return DB_LOOKUP_FCT (ni, fct_name, NULL, fctp);
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}
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#endif
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42
nss/compat-lookup.c
Normal file
42
nss/compat-lookup.c
Normal file
@ -0,0 +1,42 @@
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/* Compatibility stubs of accidentally exported __nss_*_lookup functions.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_27)
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# include <errno.h>
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# include <nsswitch.h>
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/* On i386, the function calling convention changed from the standard
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ABI calling convention to three register parameters in glibc 2.8.
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The following error-returning stub happens to be compatible with
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glibc 2.7 and earlier and glibc 2.8 and later, even on i386. */
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int
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attribute_compat_text_section
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__nss_passwd_lookup (service_user **ni, const char *fct_name, void **fctp)
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{
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__set_errno (ENOSYS);
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return -1;
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}
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compat_symbol (libc, __nss_passwd_lookup, __nss_passwd_lookup, GLIBC_2_0);
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strong_alias (__nss_passwd_lookup, __nss_group_lookup)
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compat_symbol (libc, __nss_group_lookup, __nss_group_lookup, GLIBC_2_0);
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strong_alias (__nss_passwd_lookup, __nss_hosts_lookup)
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compat_symbol (libc, __nss_hosts_lookup, __nss_hosts_lookup, GLIBC_2_0);
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#endif /* SHLIB_COMPAT */
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@ -219,4 +219,12 @@ libc_hidden_proto (__nss_hostname_digits_dots)
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#define MAX_NR_ALIASES 48
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#define MAX_NR_ADDRS 48
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/* Prototypes for __nss_*_lookup2 functions. */
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#define DEFINE_DATABASE(arg) \
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int __nss_##arg##_lookup2 (service_user **, const char *, \
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const char *, void **); \
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libc_hidden_proto (__nss_##arg##_lookup2)
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#include "databases.def"
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#undef DEFINE_DATABASE
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#endif /* nsswitch.h */
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@ -17,6 +17,5 @@
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<http://www.gnu.org/licenses/>. */
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#define DATABASE_NAME services
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#define NO_COMPAT
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#include "XXX-lookup.c"
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@ -140,9 +140,6 @@ libc_hidden_nolink_sunrpc (getnetname, GLIBC_2_1)
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/* Type of the lookup function for netname2user. */
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typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1],
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uid_t *, gid_t *, int *, gid_t *);
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/* The lookup function for the first entry of this service. */
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extern int __nss_publickey_lookup (service_user ** nip, const char *name,
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void **fctp) internal_function;
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int
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netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp,
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@ -161,7 +158,7 @@ netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp,
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if (startp == NULL)
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{
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no_more = __nss_publickey_lookup (&nip, "netname2user", &fct.ptr);
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no_more = __nss_publickey_lookup2 (&nip, "netname2user", NULL, &fct.ptr);
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if (no_more)
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startp = (service_user *) - 1;
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else
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@ -31,11 +31,6 @@ typedef int (*public_function) (const char *, char *, int *);
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/* Type of the lookup function for the secret key. */
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typedef int (*secret_function) (const char *, char *, const char *, int *);
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/* The lookup function for the first entry of this service. */
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extern int __nss_publickey_lookup (service_user **nip, const char *name,
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void **fctp) internal_function;
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int
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getpublickey (const char *name, char *key)
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{
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@ -52,7 +47,7 @@ getpublickey (const char *name, char *key)
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if (startp == NULL)
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{
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no_more = __nss_publickey_lookup (&nip, "getpublickey", &fct.ptr);
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no_more = __nss_publickey_lookup2 (&nip, "getpublickey", NULL, &fct.ptr);
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if (no_more)
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startp = (service_user *) -1;
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else
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@ -95,7 +90,7 @@ getsecretkey (const char *name, char *key, const char *passwd)
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if (startp == NULL)
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{
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no_more = __nss_publickey_lookup (&nip, "getsecretkey", &fct.ptr);
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no_more = __nss_publickey_lookup2 (&nip, "getsecretkey", NULL, &fct.ptr);
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if (no_more)
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startp = (service_user *) -1;
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else
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