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BZ#14498: fix infinite loop in nss_db_getservbyname

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nss_db uses nss_files code for services, but a continue on protocol
mismatch that doesn't affect nss_files skipped the code that advanced
to the next db entry.  Any one of these changes would suffice to fix
it, but fixing both makes them both safer to reuse elsewhere.

for  ChangeLog

	[BZ #14498]
	* NEWS: Fixed.
	* nss/nss_db/db-XXX.c (_nss_db_get##name##_r): Update hidx
	after parsing line but before break_if_match.
	* nss/nss_files/files-service (DB_LOOKUP): Don't "continue;"
	if there is a protocol mismatch.
This commit is contained in:
Alexandre Oliva 2014-11-21 03:29:56 -02:00
parent 8195921486
commit 4969890247
4 changed files with 24 additions and 9 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2014-11-21 Alexandre Oliva <aoliva@redhat.com>
[BZ #14498]
* NEWS: Fixed.
* nss/nss_db/db-XXX.c (_nss_db_get##name##_r): Update hidx
after parsing line but before break_if_match.
* nss/nss_files/files-service (DB_LOOKUP): Don't "continue;"
if there is a protocol mismatch.
2014-11-21 Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
* manual/sysinfo.texi (addmntent): It is actually MT-Safe,

8
NEWS
View File

@ -9,10 +9,10 @@ Version 2.21
* The following bugs are resolved with this release:
6652, 12926, 14132, 14138, 14171, 15215, 15884, 17266, 17344, 17363,
17370, 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522,
17555, 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585,
17589, 17594, 17616, 17625.
6652, 12926, 14132, 14138, 14171, 14498, 15215, 15884, 17266, 17344,
17363, 17370, 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508,
17522, 17555, 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584,
17585, 17589, 17594, 17616, 17625.
* CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
under certain input conditions resulting in the execution of a shell for

9
nss/nss_db/db-XXX.c
View File

@ -191,6 +191,12 @@ enum nss_status \
char *p = memcpy (buffer, valstr, len); \
\
int err = parse_line (p, result, data, buflen, errnop EXTRA_ARGS); \
\
/* Advance before break_if_match, lest it uses continue to skip
to the next entry. */ \
if ((hidx += hval2) >= header->dbs[i].hashsize) \
hidx -= header->dbs[i].hashsize; \
\
if (err > 0) \
{ \
status = NSS_STATUS_SUCCESS; \
@ -203,9 +209,6 @@ enum nss_status \
status = NSS_STATUS_TRYAGAIN; \
break; \
} \
\
if ((hidx += hval2) >= header->dbs[i].hashsize) \
hidx -= header->dbs[i].hashsize; \
} \
\
if (status == NSS_STATUS_NOTFOUND) \

7
nss/nss_files/files-service.c
View File

@ -44,8 +44,11 @@ DB_LOOKUP (servbyname, ':',
{
/* Must match both protocol (if specified) and name. */
if (proto != NULL && strcmp (result->s_proto, proto))
continue;
LOOKUP_NAME (s_name, s_aliases)
/* A continue statement here breaks nss_db, because it
bypasses advancing to the next db entry, and it
doesn't make nss_files any more efficient. */;
else
LOOKUP_NAME (s_name, s_aliases)
},
const char *name, const char *proto)