This bug was fixed in the package nss - 2:3.55-1ubuntu3
---------------
nss (2:3.55-1ubuntu3) groovy; urgency=medium
* Fix FTBFS due to erroneous glibc out-of-bounds checking with gcc 10
(LP: #1897666)
- debian/patches/fix-ftbfs-glibc-invalid-oob-error.patch: Disable
non-null error checking on call to getcwd since this results in an
erroneous warning that causes the build to fail otherwise
-- Alex Murray <alex.mur...@canonical.com> Tue, 29 Sep 2020 10:39:29
+0930
** Changed in: nss (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1897666
Title:
FTBFS: nss for groovy ftbfs due to erroneous nonnull check arising
from glibc getcwd() annotation
Status in nss package in Ubuntu:
Fix Released
Bug description:
As per the archive test rebuild done recently by doko, nss FTBFS due
to a compiler warning raised by gcc-10 (and this fails the build due
to the use of -Werror in CFLAGS):
https://launchpad.net/ubuntu/+archive/test-
rebuild-20200925-groovy/+build/20033437
nsinstall.c: In function ‘main’:
nsinstall.c:70:16: error: argument 1 is null but the corresponding size
argument 2 value is 4096 [-Werror=nonnull]
70 | #define GETCWD getcwd
| ^
nsinstall.c:239:8: note: in expansion of macro ‘GETCWD’
239 | cwd = GETCWD(0, PATH_MAX);
| ^~~~~~
In file included from nsinstall.c:20:
/usr/include/unistd.h:520:14: note: in a call to function ‘getcwd’ declared
with attribute ‘write_only (1, 2)’
520 | extern char *getcwd (char *__buf, size_t __size) __THROW __wur
| ^~~~~~
nsinstall.c:70:16: error: argument 1 is null but the corresponding size
argument 2 value is 4096 [-Werror=nonnull]
70 | #define GETCWD getcwd
| ^
nsinstall.c:246:13: note: in expansion of macro ‘GETCWD’
246 | todir = GETCWD(0, PATH_MAX);
| ^~~~~~
In file included from nsinstall.c:20:
/usr/include/unistd.h:520:14: note: in a call to function ‘getcwd’ declared
with attribute ‘write_only (1, 2)’
520 | extern char *getcwd (char *__buf, size_t __size) __THROW __wur
| ^~~~~~
cc1: all warnings being treated as errors
According to the upstream bug report at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96832 this would appear
to be because of the annotation of getcwd() with the access attribute.
However, there seems to be some debate about the best way to resolve
this (whether in glibc or in the callers of getcwd, ie nss) for now I
propose to just disable this check via the use of gcc's #pragma
directive.
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