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Separate internal state between getXXent and getXXbyYY NSS calls (bug 18007)

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This commit is contained in:
Andreas Schwab 2015-03-25 16:35:46 +01:00
parent e1b6cb04f5
commit b13b96ca05
8 changed files with 122 additions and 185 deletions
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38
ChangeLog
View File

@ -1,3 +1,41 @@
2015-05-11 Andreas Schwab <schwab@suse.de>
[BZ #18007]
* nis/nss_compat/compat-grp.c (internal_endgrent): Don't call
nss_endgrent.
(_nss_compat_endgrent): Call nss_endgrent.
* nis/nss_compat/compat-pwd.c (internal_endpwent): Don't call
nss_endpwent.
(_nss_compat_endpwent): Call nss_endpwent.
* nis/nss_compat/compat-spwd.c (internal_setspent): Add parameter
needent, call nss_setspent only if non-zero.
(_nss_compat_setspent, _nss_compat_getspent_r): Pass non-zero.
(internal_endspent): Don't call nss_endspent.
(_nss_compat_endspent): Call nss_endspent.
* nss/nss_files/files-XXX.c (position, last_use, keep_stream):
Remove. All uses removed.
(internal_setent): Remove parameter stayopen, add parameter
stream. Use it instead of global variable.
(CONCAT(_nss_files_set,ENTNAME)): Pass global stream.
(internal_endent, internal_getent): Add parameter stream. Use it
instead of global variable.
(CONCAT(_nss_files_end,ENTNAME))
(CONCAT(_nss_files_get,ENTNAME_r)): Pass global stream.
(_nss_files_get##name##_r): Pass local stream. Remove locking.
* nss/nss_files/files-alias.c (position, last_use): Remove. All
uses removed.
(internal_setent, internal_endent): Add parameter stream. Use it
instead of global variable.
(_nss_files_setaliasent, _nss_files_endaliasent): Pass global
stream.
(get_next_alias): Add parameter stream.
(_nss_files_getaliasent_r): Pass global stream.
(_nss_files_getaliasbyname_r): Pass local stream. Remove locking.
* nss/nss_files/files-hosts.c (_nss_files_gethostbyname3_r)
(_nss_files_gethostbyname4_r): Pass local stream to
internal_setent, internal_getent and internal_endent. Remove
locking.
2015-05-11 Stefan Liebler <stli@linux.vnet.ibm.com>
* tst-strfmon1.c (tests): Update expected currency symbol.

7
NEWS
View File

@ -44,10 +44,9 @@ Version 2.22
Hat). These updates cause user visible changes, such as the fix for bug
17998.
* CVE-2014-8121 The NSS files backend would reset the file pointer used by
the get*ent functions if any of the query functions for the same database
are used during the iteration, causing a denial-of-service condition in
some applications.
* CVE-2014-8121 The NSS backends shared internal state between the getXXent
and getXXbyYY NSS calls for the same database, causing a denial-of-service
condition in some applications.
Version 2.21

6
nis/nss_compat/compat-grp.c
View File

@ -194,9 +194,6 @@ _nss_compat_setgrent (int stayopen)
static enum nss_status
internal_endgrent (ent_t *ent)
{
if (nss_endgrent)
nss_endgrent ();
if (ent->stream != NULL)
{
fclose (ent->stream);
@ -222,6 +219,9 @@ _nss_compat_endgrent (void)
__libc_lock_lock (lock);
if (nss_endgrent)
nss_endgrent ();
result = internal_endgrent (&ext_ent);
__libc_lock_unlock (lock);

6
nis/nss_compat/compat-pwd.c
View File

@ -311,9 +311,6 @@ _nss_compat_setpwent (int stayopen)
static enum nss_status
internal_endpwent (ent_t *ent)
{
if (nss_endpwent)
nss_endpwent ();
if (ent->stream != NULL)
{
fclose (ent->stream);
@ -346,6 +343,9 @@ _nss_compat_endpwent (void)
__libc_lock_lock (lock);
if (nss_endpwent)
nss_endpwent ();
result = internal_endpwent (&ext_ent);
__libc_lock_unlock (lock);

16
nis/nss_compat/compat-spwd.c
View File

@ -169,7 +169,7 @@ copy_spwd_changes (struct spwd *dest, struct spwd *src,
}
static enum nss_status
internal_setspent (ent_t *ent, int stayopen)
internal_setspent (ent_t *ent, int stayopen, int needent)
{
enum nss_status status = NSS_STATUS_SUCCESS;
@ -239,7 +239,7 @@ internal_setspent (ent_t *ent, int stayopen)
give_spwd_free (&ent->pwd);
if (status == NSS_STATUS_SUCCESS && nss_setspent)
if (needent && status == NSS_STATUS_SUCCESS && nss_setspent)
ent->setent_status = nss_setspent (stayopen);
return status;
@ -256,7 +256,7 @@ _nss_compat_setspent (int stayopen)
if (ni == NULL)
init_nss_interface ();
result = internal_setspent (&ext_ent, stayopen);
result = internal_setspent (&ext_ent, stayopen, 1);
__libc_lock_unlock (lock);
@ -267,9 +267,6 @@ _nss_compat_setspent (int stayopen)
static enum nss_status
internal_endspent (ent_t *ent)
{
if (nss_endspent)
nss_endspent ();
if (ent->stream != NULL)
{
fclose (ent->stream);
@ -303,6 +300,9 @@ _nss_compat_endspent (void)
__libc_lock_lock (lock);
if (nss_endspent)
nss_endspent ();
result = internal_endspent (&ext_ent);
__libc_lock_unlock (lock);
@ -658,7 +658,7 @@ _nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen,
init_nss_interface ();
if (ext_ent.stream == NULL)
result = internal_setspent (&ext_ent, 1);
result = internal_setspent (&ext_ent, 1, 1);
if (result == NSS_STATUS_SUCCESS)
result = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop);
@ -830,7 +830,7 @@ _nss_compat_getspnam_r (const char *name, struct spwd *pwd,
__libc_lock_unlock (lock);
result = internal_setspent (&ent, 0);
result = internal_setspent (&ent, 0, 0);
if (result == NSS_STATUS_SUCCESS)
result = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop);

109
nss/nss_files/files-XXX.c
View File

@ -60,24 +60,23 @@
/* Locks the static variables in this file. */
__libc_lock_define_initialized (static, lock)
/* Maintenance of the shared stream open on the database file. */
/* Maintenance of the stream open on the database file. For getXXent
operations the stream needs to be held open across calls, the other
getXXbyYY operations all use their own stream. */
static FILE *stream;
static fpos_t position;
static enum { nouse, getent, getby } last_use;
static int keep_stream;
/* Open database file if not already opened. */
static enum nss_status
internal_setent (int stayopen)
internal_setent (FILE **stream)
{
enum nss_status status = NSS_STATUS_SUCCESS;
if (stream == NULL)
if (*stream == NULL)
{
stream = fopen (DATAFILE, "rce");
*stream = fopen (DATAFILE, "rce");
if (stream == NULL)
if (*stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
@ -90,7 +89,7 @@ internal_setent (int stayopen)
int result;
int flags;
result = flags = fcntl (fileno (stream), F_GETFD, 0);
result = flags = fcntl (fileno (*stream), F_GETFD, 0);
if (result >= 0)
{
# ifdef O_CLOEXEC
@ -100,15 +99,15 @@ internal_setent (int stayopen)
# endif
{
flags |= FD_CLOEXEC;
result = fcntl (fileno (stream), F_SETFD, flags);
result = fcntl (fileno (*stream), F_SETFD, flags);
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (stream);
stream = NULL;
fclose (*stream);
*stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
}
@ -116,11 +115,7 @@ internal_setent (int stayopen)
}
}
else
rewind (stream);
/* Remember STAYOPEN flag. */
if (stream != NULL)
keep_stream |= stayopen;
rewind (*stream);
return status;
}
@ -134,16 +129,7 @@ CONCAT(_nss_files_set,ENTNAME) (int stayopen)
__libc_lock_lock (lock);
status = internal_setent (1);
if (status == NSS_STATUS_SUCCESS && fgetpos (stream, &position) < 0)
{
fclose (stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
last_use = getent;
status = internal_setent (&stream);
__libc_lock_unlock (lock);
@ -153,12 +139,12 @@ CONCAT(_nss_files_set,ENTNAME) (int stayopen)
/* Close the database file. */
static void
internal_endent (void)
internal_endent (FILE **stream)
{
if (stream != NULL)
if (*stream != NULL)
{
fclose (stream);
stream = NULL;
fclose (*stream);
*stream = NULL;
}
}
@ -169,10 +155,7 @@ CONCAT(_nss_files_end,ENTNAME) (void)
{
__libc_lock_lock (lock);
internal_endent ();
/* Reset STAYOPEN flag. */
keep_stream = 0;
internal_endent (&stream);
__libc_lock_unlock (lock);
@ -227,7 +210,7 @@ get_contents (char *linebuf, size_t len, FILE *stream)
/* Parsing the database file into `struct STRUCTURE' data structures. */
static enum nss_status
internal_getent (struct STRUCTURE *result,
internal_getent (FILE *stream, struct STRUCTURE *result,
char *buffer, size_t buflen, int *errnop H_ERRNO_PROTO
EXTRA_ARGS_DECL)
{
@ -300,45 +283,14 @@ CONCAT(_nss_files_get,ENTNAME_r) (struct STRUCTURE *result, char *buffer,
{
int save_errno = errno;
status = internal_setent (0);
status = internal_setent (&stream);
__set_errno (save_errno);
if (status == NSS_STATUS_SUCCESS && fgetpos (stream, &position) < 0)
{
fclose (stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
}
if (status == NSS_STATUS_SUCCESS)
{
/* If the last use was not by the getent function we need the
position the stream. */
if (last_use != getent)
{
if (fsetpos (stream, &position) < 0)
status = NSS_STATUS_UNAVAIL;
else
last_use = getent;
}
if (status == NSS_STATUS_SUCCESS)
{
status = internal_getent (result, buffer, buflen, errnop
H_ERRNO_ARG EXTRA_ARGS_VALUE);
/* Remember this position if we were successful. If the
operation failed we give the user a chance to repeat the
operation (perhaps the buffer was too small). */
if (status == NSS_STATUS_SUCCESS)
fgetpos (stream, &position);
else
/* We must make sure we reposition the stream the next call. */
last_use = nouse;
}
}
status = internal_getent (stream, result, buffer, buflen, errnop
H_ERRNO_ARG EXTRA_ARGS_VALUE);
__libc_lock_unlock (lock);
@ -364,27 +316,20 @@ _nss_files_get##name##_r (proto, \
size_t buflen, int *errnop H_ERRNO_PROTO) \
{ \
enum nss_status status; \
FILE *stream = NULL; \
\
__libc_lock_lock (lock); \
\
/* Reset file pointer to beginning or open file. */ \
status = internal_setent (keep_stream); \
/* Open file. */ \
status = internal_setent (&stream); \
\
if (status == NSS_STATUS_SUCCESS) \
{ \
/* Tell getent function that we have repositioned the file pointer. */ \
last_use = getby; \
\
while ((status = internal_getent (result, buffer, buflen, errnop \
while ((status = internal_getent (stream, result, buffer, buflen, errnop \
H_ERRNO_ARG EXTRA_ARGS_VALUE)) \
== NSS_STATUS_SUCCESS) \
{ break_if_match } \
\
if (! keep_stream) \
internal_endent (); \
internal_endent (&stream); \
} \
\
__libc_lock_unlock (lock); \
\
return status; \
}

90
nss/nss_files/files-alias.c
View File

@ -33,23 +33,23 @@
/* Locks the static variables in this file. */
__libc_lock_define_initialized (static, lock)
/* Maintenance of the shared stream open on the database file. */
/* Maintenance of the stream open on the database file. For getXXent
operations the stream needs to be held open across calls, the other
getXXbyYY operations all use their own stream. */
static FILE *stream;
static fpos_t position;
static enum { nouse, getent, getby } last_use;
static enum nss_status
internal_setent (void)
internal_setent (FILE **stream)
{
enum nss_status status = NSS_STATUS_SUCCESS;
if (stream == NULL)
if (*stream == NULL)
{
stream = fopen ("/etc/aliases", "rce");
*stream = fopen ("/etc/aliases", "rce");
if (stream == NULL)
if (*stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
@ -62,7 +62,7 @@ internal_setent (void)
int result;
int flags;
result = flags = fcntl (fileno (stream), F_GETFD, 0);
result = flags = fcntl (fileno (*stream), F_GETFD, 0);
if (result >= 0)
{
# ifdef O_CLOEXEC
@ -72,14 +72,14 @@ internal_setent (void)
# endif
{
flags |= FD_CLOEXEC;
result = fcntl (fileno (stream), F_SETFD, flags);
result = fcntl (fileno (*stream), F_SETFD, flags);
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (stream);
fclose (*stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
@ -88,7 +88,7 @@ internal_setent (void)
}
}
else
rewind (stream);
rewind (*stream);
return status;
}
@ -102,16 +102,7 @@ _nss_files_setaliasent (void)
__libc_lock_lock (lock);
status = internal_setent ();
if (status == NSS_STATUS_SUCCESS && fgetpos (stream, &position) < 0)
{
fclose (stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
last_use = getent;
status = internal_setent (&stream);
__libc_lock_unlock (lock);
@ -121,12 +112,12 @@ _nss_files_setaliasent (void)
/* Close the database file. */
static void
internal_endent (void)
internal_endent (FILE **stream)
{
if (stream != NULL)
if (*stream != NULL)
{
fclose (stream);
stream = NULL;
fclose (*stream);
*stream = NULL;
}
}
@ -137,7 +128,7 @@ _nss_files_endaliasent (void)
{
__libc_lock_lock (lock);
internal_endent ();
internal_endent (&stream);
__libc_lock_unlock (lock);
@ -146,7 +137,7 @@ _nss_files_endaliasent (void)
/* Parsing the database file into `struct aliasent' data structures. */
static enum nss_status
get_next_alias (const char *match, struct aliasent *result,
get_next_alias (FILE *stream, const char *match, struct aliasent *result,
char *buffer, size_t buflen, int *errnop)
{
enum nss_status status = NSS_STATUS_NOTFOUND;
@ -397,35 +388,16 @@ _nss_files_getaliasent_r (struct aliasent *result, char *buffer, size_t buflen,
/* Be prepared that the set*ent function was not called before. */
if (stream == NULL)
status = internal_setent ();
status = internal_setent (&stream);
if (status == NSS_STATUS_SUCCESS)
{
/* If the last use was not by the getent function we need the
position the stream. */
if (last_use != getent)
{
if (fsetpos (stream, &position) < 0)
status = NSS_STATUS_UNAVAIL;
else
last_use = getent;
}
result->alias_local = 1;
if (status == NSS_STATUS_SUCCESS)
{
result->alias_local = 1;
/* Read lines until we get a definite result. */
do
status = get_next_alias (NULL, result, buffer, buflen, errnop);
while (status == NSS_STATUS_RETURN);
/* If we successfully read an entry remember this position. */
if (status == NSS_STATUS_SUCCESS)
fgetpos (stream, &position);
else
last_use = nouse;
}
/* Read lines until we get a definite result. */
do
status = get_next_alias (stream, NULL, result, buffer, buflen, errnop);
while (status == NSS_STATUS_RETURN);
}
__libc_lock_unlock (lock);
@ -440,6 +412,7 @@ _nss_files_getaliasbyname_r (const char *name, struct aliasent *result,
{
/* Return next entry in host file. */
enum nss_status status = NSS_STATUS_SUCCESS;
FILE *stream = NULL;
if (name == NULL)
{
@ -447,11 +420,8 @@ _nss_files_getaliasbyname_r (const char *name, struct aliasent *result,
return NSS_STATUS_UNAVAIL;
}
__libc_lock_lock (lock);
/* Open the stream or rest it. */
status = internal_setent ();
last_use = getby;
/* Open the stream. */
status = internal_setent (&stream);
if (status == NSS_STATUS_SUCCESS)
{
@ -459,13 +429,11 @@ _nss_files_getaliasbyname_r (const char *name, struct aliasent *result,
/* Read lines until we get a definite result. */
do
status = get_next_alias (name, result, buffer, buflen, errnop);
status = get_next_alias (stream, name, result, buffer, buflen, errnop);
while (status == NSS_STATUS_RETURN);
}
internal_endent ();
__libc_lock_unlock (lock);
internal_endent (&stream);
return status;
}

35
nss/nss_files/files-hosts.c
View File

@ -120,14 +120,13 @@ _nss_files_gethostbyname3_r (const char *name, int af, struct hostent *result,
char *buffer, size_t buflen, int *errnop,
int *herrnop, int32_t *ttlp, char **canonp)
{
FILE *stream = NULL;
uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct hostent_data);
buffer += pad;
buflen = buflen > pad ? buflen - pad : 0;
__libc_lock_lock (lock);
/* Reset file pointer to beginning or open file. */
enum nss_status status = internal_setent (keep_stream);
/* Open file. */
enum nss_status status = internal_setent (&stream);
if (status == NSS_STATUS_SUCCESS)
{
@ -135,10 +134,7 @@ _nss_files_gethostbyname3_r (const char *name, int af, struct hostent *result,
addresses to IPv6 addresses really the right thing to do? */
int flags = ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0);
/* Tell getent function that we have repositioned the file pointer. */
last_use = getby;
while ((status = internal_getent (result, buffer, buflen, errnop,
while ((status = internal_getent (stream, result, buffer, buflen, errnop,
herrnop, af, flags))
== NSS_STATUS_SUCCESS)
{
@ -165,7 +161,7 @@ _nss_files_gethostbyname3_r (const char *name, int af, struct hostent *result,
bufferend = (char *) &result->h_aliases[naliases + 1];
again:
while ((status = internal_getent (&tmp_result_buf, tmp_buffer,
while ((status = internal_getent (stream, &tmp_result_buf, tmp_buffer,
tmp_buflen, errnop, herrnop, af,
flags))
== NSS_STATUS_SUCCESS)
@ -341,15 +337,12 @@ _nss_files_gethostbyname3_r (const char *name, int af, struct hostent *result,
free (tmp_buffer);
}
if (! keep_stream)
internal_endent ();
internal_endent (&stream);
}
if (canonp && status == NSS_STATUS_SUCCESS)
*canonp = result->h_name;
__libc_lock_unlock (lock);
return status;
}
@ -378,16 +371,13 @@ _nss_files_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
char *buffer, size_t buflen, int *errnop,
int *herrnop, int32_t *ttlp)
{
__libc_lock_lock (lock);
FILE *stream = NULL;
/* Reset file pointer to beginning or open file. */
enum nss_status status = internal_setent (keep_stream);
/* Open file. */
enum nss_status status = internal_setent (&stream);
if (status == NSS_STATUS_SUCCESS)
{
/* Tell getent function that we have repositioned the file pointer. */
last_use = getby;
bool any = false;
bool got_canon = false;
while (1)
@ -399,7 +389,7 @@ _nss_files_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
buflen = buflen > pad ? buflen - pad : 0;
struct hostent result;
status = internal_getent (&result, buffer, buflen, errnop,
status = internal_getent (stream, &result, buffer, buflen, errnop,
herrnop, AF_UNSPEC, 0);
if (status != NSS_STATUS_SUCCESS)
break;
@ -475,8 +465,7 @@ _nss_files_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
status = NSS_STATUS_SUCCESS;
}
if (! keep_stream)
internal_endent ();
internal_endent (&stream);
}
else if (status == NSS_STATUS_TRYAGAIN)
{
@ -489,7 +478,5 @@ _nss_files_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
*herrnop = NO_DATA;
}
__libc_lock_unlock (lock);
return status;
}