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glibc/glibc-rh1747502.patch

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commit 99135114ba23c3110b7e4e650fabdc5e639746b7
Author: DJ Delorie <dj@redhat.com>
Date: Fri Jun 28 18:30:00 2019 -0500
nss_db: fix endent wrt NULL mappings [BZ #24695] [BZ #24696]
nss_db allows for getpwent et al to be called without a set*ent,
but it only works once. After the last get*ent a set*ent is
required to restart, because the end*ent did not properly reset
the module. Resetting it to NULL allows for a proper restart.
If the database doesn't exist, however, end*ent erroniously called
munmap which set errno.
The test case runs "makedb" inside the testroot, so needs selinux
DSOs installed.
diff -rupN a/nss/Makefile b/nss/Makefile
--- a/nss/Makefile 2019-11-04 15:14:16.721221038 -0500
+++ b/nss/Makefile 2019-11-04 15:15:46.447544678 -0500
@@ -60,6 +60,10 @@ tests = test-netdb test-digits-dots ts
tst-nss-test5
xtests = bug-erange
+tests-container = \
+ tst-nss-db-endpwent \
+ tst-nss-db-endgrent
+
# Tests which need libdl
ifeq (yes,$(build-shared))
tests += tst-nss-files-hosts-erange
diff -rupN a/nss/nss_db/db-open.c b/nss/nss_db/db-open.c
--- a/nss/nss_db/db-open.c 2018-08-01 01:10:47.000000000 -0400
+++ b/nss/nss_db/db-open.c 2019-11-04 15:15:10.520213846 -0500
@@ -63,5 +63,9 @@ internal_setent (const char *file, struc
void
internal_endent (struct nss_db_map *mapping)
{
- munmap (mapping->header, mapping->len);
+ if (mapping->header != NULL)
+ {
+ munmap (mapping->header, mapping->len);
+ mapping->header = NULL;
+ }
}
diff -rupN a/nss/tst-nss-db-endgrent.c b/nss/tst-nss-db-endgrent.c
--- a/nss/tst-nss-db-endgrent.c 1969-12-31 19:00:00.000000000 -0500
+++ b/nss/tst-nss-db-endgrent.c 2019-11-04 15:15:10.526214069 -0500
@@ -0,0 +1,54 @@
+/* Test for endgrent changing errno for BZ #24696
+ Copyright (C) 2019 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdlib.h>
+#include <sys/types.h>
+#include <grp.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <support/check.h>
+#include <support/support.h>
+
+/* The following test verifies that if the db NSS Service is initialized
+ with no database (getgrent), that a subsequent closure (endgrent) does
+ not set errno. In the case of the db service it is not an error to close
+ the service and so it should not set errno. */
+
+static int
+do_test (void)
+{
+ /* Just make sure it's not there, although usually it won't be. */
+ unlink ("/var/db/group.db");
+
+ /* This, in conjunction with the testroot's nsswitch.conf, causes
+ the nss_db module to be "connected" and initialized - but the
+ testroot has no group.db, so no mapping will be created. */
+ getgrent ();
+
+ errno = 0;
+
+ /* Before the fix, this would call munmap (NULL) and set errno. */
+ endgrent ();
+
+ if (errno != 0)
+ FAIL_EXIT1 ("endgrent set errno to %d\n", errno);
+
+ return 0;
+}
+#include <support/test-driver.c>
diff -rupN a/nss/tst-nss-db-endgrent.root/etc/nsswitch.conf b/nss/tst-nss-db-endgrent.root/etc/nsswitch.conf
--- a/nss/tst-nss-db-endgrent.root/etc/nsswitch.conf 1969-12-31 19:00:00.000000000 -0500
+++ b/nss/tst-nss-db-endgrent.root/etc/nsswitch.conf 2019-11-04 15:15:10.539214550 -0500
@@ -0,0 +1 @@
+group : db files
diff -rupN a/nss/tst-nss-db-endpwent.c b/nss/tst-nss-db-endpwent.c
--- a/nss/tst-nss-db-endpwent.c 1969-12-31 19:00:00.000000000 -0500
+++ b/nss/tst-nss-db-endpwent.c 2019-11-04 15:15:10.545214772 -0500
@@ -0,0 +1,66 @@
+/* Test for endpwent->getpwent crash for BZ #24695
+ Copyright (C) 2019 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <pwd.h>
+
+#include <support/support.h>
+#include <support/check.h>
+
+/* It is entirely allowed to start with a getpwent call without
+ resetting the state of the service via a call to setpwent.
+ You can also call getpwent more times than you have entries in
+ the service, and it should not fail. This test iteratates the
+ database once, gets to the end, and then attempts a second
+ iteration to look for crashes. */
+
+static void
+try_it (void)
+{
+ struct passwd *pw;
+
+ /* setpwent is intentionally omitted here. The first call to
+ getpwent detects that it's first and initializes. The second
+ time try_it is called, this "first call" was not detected before
+ the fix, and getpwent would crash. */
+
+ while ((pw = getpwent ()) != NULL)
+ ;
+
+ /* We only care if this segfaults or not. */
+ endpwent ();
+}
+
+static int
+do_test (void)
+{
+ char *cmd;
+
+ cmd = xasprintf ("%s/makedb -o /var/db/passwd.db /var/db/passwd.in",
+ support_bindir_prefix);
+ system (cmd);
+ free (cmd);
+
+ try_it ();
+ try_it ();
+
+ return 0;
+}
+#include <support/test-driver.c>
diff -rupN a/nss/tst-nss-db-endpwent.root/etc/nsswitch.conf b/nss/tst-nss-db-endpwent.root/etc/nsswitch.conf
--- a/nss/tst-nss-db-endpwent.root/etc/nsswitch.conf 1969-12-31 19:00:00.000000000 -0500
+++ b/nss/tst-nss-db-endpwent.root/etc/nsswitch.conf 2019-11-04 15:15:10.556215180 -0500
@@ -0,0 +1 @@
+passwd: db
diff -rupN a/nss/tst-nss-db-endpwent.root/var/db/passwd.in b/nss/tst-nss-db-endpwent.root/var/db/passwd.in
--- a/nss/tst-nss-db-endpwent.root/var/db/passwd.in 1969-12-31 19:00:00.000000000 -0500
+++ b/nss/tst-nss-db-endpwent.root/var/db/passwd.in 2019-11-04 15:15:10.567215588 -0500
@@ -0,0 +1,4 @@
+.root root:x:0:0:root:/root:/bin/bash
+=0 root:x:0:0:root:/root:/bin/bash
+.bin bin:x:1:1:bin:/bin:/sbin/nologin
+=1 bin:x:1:1:bin:/bin:/sbin/nologin
diff -rupN a/support/Makefile b/support/Makefile
--- a/support/Makefile 2019-11-04 15:14:20.416357911 -0500
+++ b/support/Makefile 2019-11-04 15:15:10.574215847 -0500
@@ -180,6 +180,11 @@ LINKS_DSO_PROGRAM = links-dso-program
LDLIBS-links-dso-program = -lstdc++ -lgcc -lgcc_s $(libunwind)
endif
+ifeq (yes,$(have-selinux))
+LDLIBS-$(LINKS_DSO_PROGRAM) += -lselinux
+endif
+
+
LDLIBS-test-container = $(libsupport)
others += test-container
diff -rupN a/support/links-dso-program-c.c b/support/links-dso-program-c.c
--- a/support/links-dso-program-c.c 2019-11-04 15:14:17.073234077 -0500
+++ b/support/links-dso-program-c.c 2019-11-04 15:15:10.580216069 -0500
@@ -1,9 +1,26 @@
#include <stdio.h>
+/* makedb needs selinux dso's. */
+#ifdef HAVE_SELINUX
+# include <selinux/selinux.h>
+#endif
+
+/* The purpose of this file is to indicate to the build system which
+ shared objects need to be copied into the testroot, such as gcc or
+ selinux support libraries. This program is never executed, only
+ scanned for dependencies on shared objects, so the code below may
+ seem weird - it's written to survive gcc optimization and force
+ such dependencies.
+*/
+
int
main (int argc, char **argv)
{
/* Complexity to keep gcc from optimizing this away. */
printf ("This is a test %s.\n", argc > 1 ? argv[1] : "null");
+#ifdef HAVE_SELINUX
+ /* This exists to force libselinux.so to be required. */
+ printf ("selinux %d\n", is_selinux_enabled ());
+#endif
return 0;
}
diff -rupN a/support/links-dso-program.cc b/support/links-dso-program.cc
--- a/support/links-dso-program.cc 2019-11-04 15:14:17.079234300 -0500
+++ b/support/links-dso-program.cc 2019-11-04 15:15:10.587216328 -0500
@@ -1,11 +1,28 @@
#include <iostream>
+/* makedb needs selinux dso's. */
+#ifdef HAVE_SELINUX
+# include <selinux/selinux.h>
+#endif
+
using namespace std;
+/* The purpose of this file is to indicate to the build system which
+ shared objects need to be copied into the testroot, such as gcc or
+ selinux support libraries. This program is never executed, only
+ scanned for dependencies on shared objects, so the code below may
+ seem weird - it's written to survive gcc optimization and force
+ such dependencies.
+*/
+
int
main (int argc, char **argv)
{
/* Complexity to keep gcc from optimizing this away. */
cout << (argc > 1 ? argv[1] : "null");
+#ifdef HAVE_SELINUX
+ /* This exists to force libselinux.so to be required. */
+ cout << "selinux " << is_selinux_enabled ();
+#endif
return 0;
}
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