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nisplus: Correct pwent parsing issue and resulting build error [BZ #23266]

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Copy and null-terminate NIS+ password file UID and GID entries whose
length is non-zero and are not terminated, in addition to empty ones,
fixing a bug and a compilation issue causing an error with GCC 8:

nss_nisplus/nisplus-parser.c: In function '_nss_nisplus_parse_pwent':
nss_nisplus/nisplus-parser.c:90:7: error: 'strncpy' destination unchanged after copying no bytes [-Werror=stringop-truncation]
       strncpy (first_unused, numstr, len);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nss_nisplus/nisplus-parser.c:106:7: error: 'strncpy' destination unchanged after copying no bytes [-Werror=stringop-truncation]
       strncpy (first_unused, numstr, len);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

introduced with commit ac05397075:

commit ac05397075
Author: Ulrich Drepper <drepper@redhat.com>
Date:   Sun Apr 30 07:01:26 2006 +0000

	* nis/nss_nisplus/nisplus-parser.c: Minor optimizations and
	cleanups.  Avoid copying data if it can be used in the old place.

(no mailing list reference available).  Obviously regardless of the
recently added compiler diagnostics causing a build error this code has
been long non-functional, so I guess NIS+ servers have been supplying
strings that are non-empty and have already been null-terminated.
Which in turn made it unnecessary to make a null-terminated copy,
masking this bug.

	[BZ #23266]
	* nis/nss_nisplus/nisplus-parser.c (_nss_nisplus_parse_pwent):
	Copy and null-terminate entries that are not terminated, in
	addition to empty ones.
This commit is contained in:
Maciej W. Rozycki 2018-06-27 21:12:16 +01:00
parent c49e18222e
commit 780684eb04
2 changed files with 9 additions and 2 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2018-06-27 Maciej W. Rozycki <macro@mips.com>
[BZ #23266]
* nis/nss_nisplus/nisplus-parser.c (_nss_nisplus_parse_pwent):
Copy and null-terminate entries that are not terminated, in
addition to empty ones.
2018-06-27 Florian Weimer <fweimer@redhat.com>
[BZ #18023]

4
nis/nss_nisplus/nisplus-parser.c
View File

@ -82,7 +82,7 @@ _nss_nisplus_parse_pwent (nis_result *result, struct passwd *pw,
char *numstr = NISOBJVAL (2, obj);
len = NISOBJLEN (2, obj);
if (len == 0 && numstr[len - 1] != '\0')
if (len == 0 || numstr[len - 1] != '\0')
{
if (len >= room_left)
goto no_more_room;
@ -98,7 +98,7 @@ _nss_nisplus_parse_pwent (nis_result *result, struct passwd *pw,
numstr = NISOBJVAL (3, obj);
len = NISOBJLEN (3, obj);
if (len == 0 && numstr[len - 1] != '\0')
if (len == 0 || numstr[len - 1] != '\0')
{
if (len >= room_left)
goto no_more_room;