freebsd-dev/lib/libutil
Stefan Eßer 6c2596f00c Change getlocalbase() to not allocate any heap memory
After the commit of the current version, Scott Long pointed out, that an
attacker might be able to cause a use-after-free access if this function
returned the value of the sysctl variable "user.localbase" by freeing
the allocated memory without the cached address being cleared in the
library function.

To resolve this issue, I have proposed the originally suggested version
with a statically allocated buffer in a review (D27370). There was no
feedback on this review and after waiting for more than 2 weeks, the
potential security issue is fixed by this commit. (There was no security
risk in practice, since none of the programs converted to use this
function attempted to free the buffer. The address could only have
pointed into the heap if user.localbase was set to a non-default value,
into r/o data or the environment, else.)

This version uses a static buffer of size LOCALBASE_CTL_LEN, which
defaults to MAXPATHLEN. This does not increase the memory footprint
of the library at this time, since its data segment grows from less
than 7 KB to less than 8 KB, i.e. it will get two 4 KB pages on typical
architectures, anyway.

Compiling with LOCALBASE_CTL_LEN defined as 0 will remove the code
that accesses the sysctl variable, values between 1 and MAXPATHLEN-1
will limit the maximum size of the prefix. When built with such a
value and if too large a value has been configured in user.localbase,
the value defined as ILLEGAL_PREFIX will be returned to cause any
file operations on that result to fail. (Default value is "/dev/null/",
the review contained "/\177", but I assume that "/dev/null" exists and
can not be accessed as a directory. Any other string that can be assumed
not be a valid path prefix could be used.)

I do suggest to use LOCALBASE_CTL_LEN to size the in-kernel buffer for
the user.localbase variable, too. Doing this would guarantee that the
result always fit into the buffer in this library function (unless run
on a kernel built with a different buffer size.)

The function always returns a valid string, and only in case it is built
with a small static buffer and run on a system with too large a value in
user.localbase, the ILLEGAL_PREFIX will be returned, effectively causing
the created path to be non-existent.

Differential Revision:	https://reviews.freebsd.org/D27370
2020-12-12 11:23:52 +00:00
..
tests
_secure_path.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
_secure_path.c
auth.c
expand_number.3
expand_number.c
flopen.3
flopen.c
fparseln.3
fparseln.c
getlocalbase.3 Change getlocalbase() to not allocate any heap memory 2020-12-12 11:23:52 +00:00
getlocalbase.c Change getlocalbase() to not allocate any heap memory 2020-12-12 11:23:52 +00:00
gr_util.c libutil: remove extraneous ": " from error messages 2020-06-20 06:10:42 +00:00
hexdump.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
hexdump.c
humanize_number.3
humanize_number.c
kinfo_getallproc.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
kinfo_getallproc.c
kinfo_getfile.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
kinfo_getfile.c
kinfo_getproc.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
kinfo_getproc.c
kinfo_getvmmap.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
kinfo_getvmmap.c
kinfo_getvmobject.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
kinfo_getvmobject.c
kld.3
kld.c
libutil.h Add function getlocalbase() to libutil. 2020-11-18 19:44:30 +00:00
login_auth.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
login_auth.c
login_cap.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
login_cap.c
login_cap.h
login_class.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
login_class.c
login_crypt.c
login_ok.3 Fix a few mandoc issues 2020-10-09 19:12:44 +00:00
login_ok.c
login_times.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
login_times.c
login_tty.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
login_tty.c
login.conf.5 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
Makefile Add function getlocalbase() to libutil. 2020-11-18 19:44:30 +00:00
Makefile.depend
pidfile.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
pidfile.c Add CAP_EVENT to pidfiles. 2020-06-25 21:34:43 +00:00
property.3
property.c
pty.3
pty.c
pw_util.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
pw_util.c Make vipw error message less cryptic 2020-06-20 06:20:00 +00:00
quotafile.3
quotafile.c
realhostname_sa.3
realhostname.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
realhostname.c
stub.c
trimdomain.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
trimdomain.c
uucplock.3 libutil: Document function HISTORY within the manpages 2020-06-14 05:35:02 +00:00
uucplock.c