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Fix an issue when nss fallback routines are used in a multithreaded application.

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Reviewed by:        bushman
Approved by:        dfr (mentor)
This commit is contained in:
Zachary Loafman 2009-05-27 17:01:59 +00:00
parent f72c0c2e5c
commit 6d72217368
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=192911
2 changed files with 24 additions and 4 deletions
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1
lib/libc/include/nss_tls.h
View File

@ -67,6 +67,7 @@ name##_getstate(struct name##_state **p) \
*p = calloc(1, sizeof(**p)); \
if (*p == NULL) \
return (ENOMEM); \
memset(*p, 0, sizeof(**p)); \
rv = _pthread_setspecific(name##_state_key, *p); \
if (rv != 0) { \
free(*p); \

27
lib/libc/net/nsdispatch.c
View File

@ -80,12 +80,14 @@ __FBSDID("$FreeBSD$");
#define _NS_PRIVATE
#include <nsswitch.h>
#include <pthread.h>
#include <pthread_np.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "un-namespace.h"
#include "nss_tls.h"
#include "libc_private.h"
#ifdef NS_CACHING
#include "nscache.h"
@ -143,7 +145,11 @@ static void *nss_cache_cycle_prevention_func = NULL;
* which in turn calls nsdispatch, which should call fallback
* function) are not supported
*/
static int fallback_dispatch = 0;
struct fb_state {
int fb_dispatch;
};
static void fb_endstate(void *);
NSS_TLS_HANDLING(fb);
/*
* Attempt to spew relatively uniform messages to syslog.
@ -598,6 +604,11 @@ nss_method_lookup(const char *source, const char *database,
return (NULL);
}
static void
fb_endstate(void *p)
{
free(p);
}
__weak_reference(_nsdispatch, nsdispatch);
@ -611,6 +622,7 @@ _nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
nss_method method, fb_method;
void *mdata;
int isthreaded, serrno, i, result, srclistsize;
struct fb_state *st;
#ifdef NS_CACHING
nss_cache_data cache_data;
@ -630,12 +642,19 @@ _nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
goto fin;
}
}
result = fb_getstate(&st);
if (result != 0) {
result = NS_UNAVAIL;
goto fin;
}
result = nss_configure();
if (result != 0) {
result = NS_UNAVAIL;
goto fin;
}
if (fallback_dispatch == 0) {
if (st->fb_dispatch == 0) {
dbt = vector_search(&database, _nsmap, _nsmapsize, sizeof(*_nsmap),
string_compare);
fb_method = nss_method_lookup(NSSRC_FALLBACK, database,
@ -702,12 +721,12 @@ _nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
break;
} else {
if (fb_method != NULL) {
fallback_dispatch = 1;
st->fb_dispatch = 1;
va_start(ap, defaults);
result = fb_method(retval,
(void *)srclist[i].name, ap);
va_end(ap);
fallback_dispatch = 0;
st->fb_dispatch = 0;
} else
nss_log(LOG_DEBUG, "%s, %s, %s, not found, "
"and no fallback provided",