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nss: fix nss_database_lookup2's alternate handling [BZ #27416]

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__nss_database_lookup2's extra arguments were left unused in the
nsswitch reloading patch set; this broke compat (default config
ignored) and shadow files (secondary name ignored) which relies on
these fallbacks.

This patch adds in the previous behavior by correcting the
initialization of the database list to reflect the fallbacks.  This
means that the nss_database_lookup2 interface no longer needs to be
passed the fallback info, so API and callers were adjusted.

Since all callers needed to be edited anyway, the calls were changed
from __nss_database_lookup2 to the faster __nss_database_get.  This
was an intended optimization which was deferred during the initial
lookup changes to avoid touching so many files.

The test case verifies that compat targets work (passwd) and that the
default configuration works (group).  Tested on x86-64.
This commit is contained in:
DJ Delorie
2021-02-15 21:34:23 -05:00
parent 24eb3be5db
commit 9b456c5da9
32 changed files with 252 additions and 105 deletions
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7
nss/nss_test.h
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@ -33,11 +33,13 @@
#include <pwd.h>
#include <grp.h>
#include <shadow.h>
#include <netdb.h>
typedef struct test_tables {
struct passwd *pwd_table;
struct group *grp_table;
struct spwd *spwd_table;
struct hostent *host_table;
} test_tables;
@ -46,10 +48,12 @@ extern void _nss_test2_init_hook (test_tables *) __attribute__((weak));
#define PWD_LAST() { .pw_name = NULL, .pw_uid = 0 }
#define GRP_LAST() { .gr_name = NULL, .gr_gid = 0 }
#define SPWD_LAST() { .sp_namp = NULL, .sp_pwdp = NULL }
#define HOST_LAST() { .h_name = NULL, .h_aliases = NULL, .h_length = 0, .h_addr_list = NULL }
#define PWD_ISLAST(p) ((p)->pw_name == NULL && (p)->pw_uid == 0)
#define GRP_ISLAST(g) ((g)->gr_name == NULL && (g)->gr_gid == 0)
#define SPWD_ISLAST(s) ((s)->sp_namp == NULL && (s)->sp_pwdp == 0)
#define HOST_ISLAST(h) ((h)->h_name == NULL && (h)->h_length == 0)
/* Macros to fill in the tables easily. */
@ -76,6 +80,9 @@ extern void _nss_test2_init_hook (test_tables *) __attribute__((weak));
{ .gr_name = (char *) n, .gr_passwd = (char *) "*", .gr_gid = u, \
.gr_mem = (char **) m }
#define SPWD(u) \
{ .sp_namp = (char *) "name" #u, .sp_pwdp = (char *) "passwd" #u }
#define HOST(u) \
{ .h_name = (char *) "name" #u, .h_aliases = NULL, .h_addrtype = u, \
.h_length = 4, \