mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-19 12:57:53 +00:00
65 lines
2.3 KiB
Diff
65 lines
2.3 KiB
Diff
commit f88759ea9bd3c8d8fef28f123ba9767cb0e421a3
|
|
Author: Joseph Myers <joseph@codesourcery.com>
|
|
Date: Wed Dec 21 23:44:01 2016 +0000
|
|
|
|
Fix nss_nisplus build with mainline GCC (bug 20978).
|
|
|
|
glibc build with current mainline GCC fails because
|
|
nis/nss_nisplus/nisplus-alias.c contains code
|
|
|
|
if (name != NULL)
|
|
{
|
|
*errnop = EINVAL;
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
|
|
char buf[strlen (name) + 9 + tablename_len];
|
|
|
|
producing an error about strlen being called on a pointer that is
|
|
always NULL (and a subsequent use of that pointer with a %s format in
|
|
snprintf).
|
|
|
|
As Andreas noted, the bogus conditional comes from a 1997 change:
|
|
|
|
- if (name == NULL || strlen(name) > 8)
|
|
- return NSS_STATUS_NOTFOUND;
|
|
- else
|
|
+ if (name != NULL || strlen(name) <= 8)
|
|
|
|
So the intention is clearly to return an error for NULL name.
|
|
|
|
This patch duly inverts the sense of the conditional. It fixes the
|
|
build with GCC mainline, and passes usual glibc testsuite testing for
|
|
x86_64. However, I have not tried any actual substantive nisplus
|
|
testing, do not have an environment for such testing, and do not know
|
|
whether it is possible that strlen (name) or tablename_len might be
|
|
large so that the VLA for buf is actually a security issue. However,
|
|
if it is a security issue, there are plenty of other similar instances
|
|
in the nisplus code (that haven't been hidden by a bogus comparison
|
|
with NULL) - and nis_table.c:__create_ib_request uses strdupa on the
|
|
string passed to nis_list, so a local fix in the caller wouldn't
|
|
suffice anyway (see bug 20987). (Calls to strdupa and other such
|
|
macros that use alloca must be considered equally questionable
|
|
regarding stack overflow issues as direct calls to alloca and VLA
|
|
declarations.)
|
|
|
|
[BZ #20978]
|
|
* nis/nss_nisplus/nisplus-alias.c (_nss_nisplus_getaliasbyname_r):
|
|
Compare name == NULL, not name != NULL.
|
|
|
|
---
|
|
nis/nss_nisplus/nisplus-alias.c | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
--- a/nis/nss_nisplus/nisplus-alias.c
|
|
+++ b/nis/nss_nisplus/nisplus-alias.c
|
|
@@ -291,7 +291,7 @@
|
|
return status;
|
|
}
|
|
|
|
- if (name != NULL)
|
|
+ if (name == NULL)
|
|
{
|
|
*errnop = EINVAL;
|
|
return NSS_STATUS_UNAVAIL;
|