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include: ssp: round out fortification of current set of headers

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ssp/ssp.h needed some improvements:
 - `len` isn't always a size_t, it may need casted
 - In some cases we may want to use a len that isn't specified as a
    parameter (e.g., L_ctermid), so __ssp_redirect() should be more
    flexible.
 - In other cases we may want additional checking, so pull all of the
    declaration bits out of __ssp_redirect_raw() so that some functions
    can implement the body themselves.

strlcat/strlcpy should be the last of the fortified functions that get
their own __*_chk symbols, and these cases are only done to be
consistent with the rest of the str*() set.

Reviewed by:	markj
Sponsored by:	Klara, Inc.
Sponsored by:	Stormshield
Differential Revision:	https://reviews.freebsd.org/D45679
This commit is contained in:
Kyle Evans 2024-07-13 00:16:10 -05:00
parent c10d567ea0
commit cf8e5289a1
37 changed files with 3663 additions and 62 deletions
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16
include/ssp/ssp.h
View File

@ -67,21 +67,25 @@
#define __ssp_bos0(ptr) __builtin_object_size(ptr, 0)
#define __ssp_check(buf, len, bos) \
if (bos(buf) != (size_t)-1 && len > bos(buf)) \
if (bos(buf) != (size_t)-1 && (size_t)len > bos(buf)) \
__chk_fail()
#define __ssp_redirect_raw(rtype, fun, symbol, args, call, cond, bos) \
#define __ssp_redirect_raw_impl(rtype, fun, symbol, args) \
rtype __ssp_real_(fun) args __RENAME(symbol); \
__ssp_inline rtype fun args __RENAME(__ssp_protected_ ## fun); \
__ssp_inline rtype fun args { \
__ssp_inline rtype fun args
#define __ssp_redirect_raw(rtype, fun, symbol, args, call, cond, bos, len) \
__ssp_redirect_raw_impl(rtype, fun, symbol, args) { \
if (cond) \
__ssp_check(__buf, __len, bos); \
__ssp_check(__buf, len, bos); \
return __ssp_real_(fun) call; \
}
#define __ssp_redirect(rtype, fun, args, call) \
__ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos)
__ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos, __len)
#define __ssp_redirect0(rtype, fun, args, call) \
__ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos0)
__ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos0, __len)
#include <machine/_stdint.h>

18
include/ssp/stdio.h
View File

@ -37,6 +37,24 @@
#include <ssp/ssp.h>
__BEGIN_DECLS
#if __SSP_FORTIFY_LEVEL > 0
#if __POSIX_VISIBLE
__ssp_redirect_raw(char *, ctermid, ctermid, (char *__buf), (__buf),
__buf != NULL, __ssp_bos, L_ctermid);
#if __BSD_VISIBLE
__ssp_redirect_raw(char *, ctermid_r, ctermid_r, (char *__buf), (__buf),
__buf != NULL, __ssp_bos, L_ctermid);
#endif /* __BSD_VISIBLE */
#endif /* __POSIX_VISIBLE */
__ssp_redirect(size_t, fread, (void *__restrict __buf, size_t __len,
size_t __nmemb, FILE *__restrict __fp), (__buf, __len, __nmemb, __fp));
__ssp_redirect(size_t, fread_unlocked, (void *__restrict __buf, size_t __len,
size_t __nmemb, FILE *__restrict __fp), (__buf, __len, __nmemb, __fp));
__ssp_redirect(char *, gets_s, (char *__buf, rsize_t __len), (__buf, __len));
__ssp_redirect_raw(char *, tmpnam, tmpnam, (char *__buf), (__buf), 1,
__ssp_bos, L_tmpnam);
#endif
int __sprintf_chk(char *__restrict, int, size_t, const char *__restrict, ...)
__printflike(4, 5);
int __vsprintf_chk(char *__restrict, int, size_t, const char *__restrict,

22
include/ssp/string.h
View File

@ -45,7 +45,9 @@ char *__stpncpy_chk(char *, const char *, size_t, size_t);
char *__strcat_chk(char *, const char *, size_t);
char *__strcpy_chk(char *, const char *, size_t);
char *__strncat_chk(char *, const char *, size_t, size_t);
size_t __strlcat_chk(char *, const char *, size_t, size_t);
char *__strncpy_chk(char *, const char *, size_t, size_t);
size_t __strlcpy_chk(char *, const char *, size_t, size_t);
__END_DECLS
#if __SSP_FORTIFY_LEVEL > 0
@ -110,8 +112,24 @@ __ssp_bos_icheck2_restrict(stpcpy, char *, const char *)
__ssp_bos_icheck3_restrict(stpncpy, char *, const char *)
__ssp_bos_icheck2_restrict(strcpy, char *, const char *)
__ssp_bos_icheck2_restrict(strcat, char *, const char *)
__ssp_redirect0(int, strerror_r, (int __errnum, char *__buf, size_t __len),
(__errnum, __buf, __len));
__ssp_bos_icheck3_restrict(strncpy, char *, const char *)
__ssp_bos_icheck3_restrict(strncat, char *, const char *)
__ssp_redirect_raw_impl(void *, mempcpy, mempcpy,
(void *__restrict buf, const void *__restrict src, size_t len))
{
const size_t slen = __ssp_bos(buf);
if (len > slen)
__chk_fail();
if (__ssp_overlap(src, buf, len))
__chk_fail();
return (__ssp_real(mempcpy)(buf, src, len));
}
__END_DECLS
#define memcpy(dst, src, len) __ssp_bos_check3(memcpy, dst, src, len)
@ -122,7 +140,11 @@ __END_DECLS
#define stpncpy(dst, src, len) __ssp_bos_check3(stpncpy, dst, src, len)
#define strcpy(dst, src) __ssp_bos_check2(strcpy, dst, src)
#define strcat(dst, src) __ssp_bos_check2(strcat, dst, src)
#define strlcpy(dst, src, dstlen) \
__strlcpy_chk(dst, src, dstlen, __ssp_bos(dst))
#define strncpy(dst, src, len) __ssp_bos_check3(strncpy, dst, src, len)
#define strlcat(dst, src, dstlen) \
__strlcat_chk(dst, src, dstlen, __ssp_bos(dst))
#define strncat(dst, src, len) __ssp_bos_check3(strncat, dst, src, len)
#endif /* __SSP_FORTIFY_LEVEL > 0 */

5
include/ssp/strings.h
View File

@ -63,5 +63,10 @@
#define bzero(dst, len) _ssp_bzero(__ssp_var(dstv), dst, __ssp_var(lenv), len)
__BEGIN_DECLS
__ssp_redirect(void, explicit_bzero, (void *__buf, size_t __len),
(__buf, __len));
__END_DECLS
#endif /* __SSP_FORTIFY_LEVEL > 0 */
#endif /* _SSP_STRINGS_H_ */

36
include/ssp/unistd.h
View File

@ -43,14 +43,46 @@ __BEGIN_DECLS
#define _FORTIFY_SOURCE_read read
#endif
__ssp_redirect0(ssize_t, _FORTIFY_SOURCE_read, (int __fd, void *__buf,
__ssp_inline size_t
__ssp_gid_bos(const void *ptr)
{
size_t ptrsize = __ssp_bos(ptr);
if (ptrsize == (size_t)-1)
return (ptrsize);
return (ptrsize / sizeof(gid_t));
}
__ssp_redirect_raw(int, getgrouplist, getgrouplist,
(const char *__name, gid_t __base, gid_t *__buf, int *__lenp),
(__name, __base, __buf, __lenp), 1, __ssp_gid_bos, *__lenp);
__ssp_redirect_raw(int, getgroups, getgroups, (int __len, gid_t *__buf),
(__len, __buf), 1, __ssp_gid_bos, __len);
__ssp_redirect(int, getloginclass, (char *__buf, size_t __len),
(__buf, __len));
__ssp_redirect(ssize_t, _FORTIFY_SOURCE_read, (int __fd, void *__buf,
size_t __len), (__fd, __buf, __len));
__ssp_redirect(ssize_t, pread, (int __fd, void *__buf, size_t __len,
off_t __offset), (__fd, __buf, __len, __offset));
__ssp_redirect(ssize_t, readlink, (const char *__restrict __path, \
char *__restrict __buf, size_t __len), (__path, __buf, __len));
__ssp_redirect(ssize_t, readlinkat, (int __fd, const char *__restrict __path,
char *__restrict __buf, size_t __len), (__fd, __path, __buf, __len));
__ssp_redirect_raw(char *, getcwd, getcwd, (char *__buf, size_t __len),
(__buf, __len), __buf != 0, __ssp_bos);
(__buf, __len), __buf != 0, __ssp_bos, __len);
__ssp_redirect(int, getdomainname, (char *__buf, int __len), (__buf, __len));
__ssp_redirect(int, getentropy, (void *__buf, size_t __len), (__buf, __len));
__ssp_redirect(int, gethostname, (char *__buf, size_t __len), (__buf, __len));
__ssp_redirect(int, getlogin_r, (char *__buf, size_t __len), (__buf, __len));
__ssp_redirect(int, ttyname_r, (int __fd, char *__buf, size_t __len),
(__fd, __buf, __len));
__END_DECLS

37
include/stdio.h
View File

@ -238,6 +238,21 @@ __END_DECLS
#define stdout __stdoutp
#define stderr __stderrp
/*
* Functions defined in all versions of POSIX 1003.1.
*/
#if __BSD_VISIBLE || (__POSIX_VISIBLE && __POSIX_VISIBLE <= 199506)
#define L_cuserid 17 /* size for cuserid(3); MAXLOGNAME, legacy */
#endif
#if __POSIX_VISIBLE
#define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */
#endif /* __POSIX_VISIBLE */
#if !defined(_STANDALONE) && defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
#include <ssp/stdio.h>
#endif
__BEGIN_DECLS
#ifdef _XLOCALE_H_
#include <xlocale/_stdio.h>
@ -252,7 +267,7 @@ int ferror(FILE *);
int fflush(FILE *);
int fgetc(FILE *);
int fgetpos(FILE * __restrict, fpos_t * __restrict);
char *fgets(char * __restrict, int, FILE * __restrict);
char *(fgets)(char * __restrict, int, FILE * __restrict);
FILE *fopen(const char * __restrict, const char * __restrict);
int fprintf(FILE * __restrict, const char * __restrict, ...);
int fputc(int, FILE *);
@ -280,7 +295,7 @@ void rewind(FILE *);
int scanf(const char * __restrict, ...);
void setbuf(FILE * __restrict, char * __restrict);
int setvbuf(FILE * __restrict, char * __restrict, int, size_t);
int sprintf(char * __restrict, const char * __restrict, ...);
int (sprintf)(char * __restrict, const char * __restrict, ...);
int sscanf(const char * __restrict, const char * __restrict, ...);
FILE *tmpfile(void);
char *tmpnam(char *);
@ -288,13 +303,13 @@ int ungetc(int, FILE *);
int vfprintf(FILE * __restrict, const char * __restrict,
__va_list);
int vprintf(const char * __restrict, __va_list);
int vsprintf(char * __restrict, const char * __restrict,
int (vsprintf)(char * __restrict, const char * __restrict,
__va_list);
#if __ISO_C_VISIBLE >= 1999 || __POSIX_VISIBLE >= 199506
int snprintf(char * __restrict, size_t, const char * __restrict,
int (snprintf)(char * __restrict, size_t, const char * __restrict,
...) __printflike(3, 4);
int vsnprintf(char * __restrict, size_t, const char * __restrict,
int (vsnprintf)(char * __restrict, size_t, const char * __restrict,
__va_list) __printflike(3, 0);
#endif
#if __ISO_C_VISIBLE >= 1999
@ -305,16 +320,7 @@ int vsscanf(const char * __restrict, const char * __restrict, __va_list)
__scanflike(2, 0);
#endif
/*
* Functions defined in all versions of POSIX 1003.1.
*/
#if __BSD_VISIBLE || (__POSIX_VISIBLE && __POSIX_VISIBLE <= 199506)
#define L_cuserid 17 /* size for cuserid(3); MAXLOGNAME, legacy */
#endif
#if __POSIX_VISIBLE
#define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */
char *ctermid(char *);
FILE *fdopen(int, const char *);
int fileno(FILE *);
@ -530,7 +536,4 @@ extern int __isthreaded;
__END_DECLS
__NULLABILITY_PRAGMA_POP
#if !defined(_STANDALONE) && defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
#include <ssp/stdio.h>
#endif
#endif /* !_STDIO_H_ */

29
include/string.h
View File

@ -49,6 +49,10 @@ typedef __size_t size_t;
#define _SIZE_T_DECLARED
#endif
#if !defined(_STANDALONE) && defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
#include <ssp/string.h>
#endif
__BEGIN_DECLS
#if __XSI_VISIBLE >= 600
void *memccpy(void * __restrict, const void * __restrict, int, size_t);
@ -58,23 +62,23 @@ void *memchr(const void *, int, size_t) __pure;
void *memrchr(const void *, int, size_t) __pure;
#endif
int memcmp(const void *, const void *, size_t) __pure;
void *memcpy(void * __restrict, const void * __restrict, size_t);
void *(memcpy)(void * __restrict, const void * __restrict, size_t);
#if __BSD_VISIBLE
void *memmem(const void *, size_t, const void *, size_t) __pure;
#endif
void *memmove(void *, const void *, size_t);
void *(memmove)(void *, const void *, size_t);
#if __BSD_VISIBLE
void *mempcpy(void * __restrict, const void * __restrict, size_t);
#endif
void *memset(void *, int, size_t);
void *(memset)(void *, int, size_t);
#if __POSIX_VISIBLE >= 200809
char *stpcpy(char * __restrict, const char * __restrict);
char *stpncpy(char * __restrict, const char * __restrict, size_t);
char *(stpcpy)(char * __restrict, const char * __restrict);
char *(stpncpy)(char * __restrict, const char * __restrict, size_t);
#endif
#if __BSD_VISIBLE
char *strcasestr(const char *, const char *) __pure;
#endif
char *strcat(char * __restrict, const char * __restrict);
char *(strcat)(char * __restrict, const char * __restrict);
char *strchr(const char *, int) __pure;
#if __BSD_VISIBLE
char *strchrnul(const char*, int) __pure;
@ -82,7 +86,7 @@ int strverscmp(const char *, const char *) __pure;
#endif
int strcmp(const char *, const char *) __pure;
int strcoll(const char *, const char *);
char *strcpy(char * __restrict, const char * __restrict);
char *(strcpy)(char * __restrict, const char * __restrict);
size_t strcspn(const char *, const char *) __pure;
#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
char *strdup(const char *) __malloc_like;
@ -92,8 +96,8 @@ char *strerror(int);
int strerror_r(int, char *, size_t);
#endif
#if __BSD_VISIBLE
size_t strlcat(char * __restrict, const char * __restrict, size_t);
size_t strlcpy(char * __restrict, const char * __restrict, size_t);
size_t (strlcat)(char * __restrict, const char * __restrict, size_t);
size_t (strlcpy)(char * __restrict, const char * __restrict, size_t);
#endif
size_t strlen(const char *) __pure;
#if __BSD_VISIBLE
@ -105,9 +109,9 @@ typedef __mode_t mode_t;
void strmode(mode_t, char *);
#endif
char *strncat(char * __restrict, const char * __restrict, size_t);
char *(strncat)(char * __restrict, const char * __restrict, size_t);
int strncmp(const char *, const char *, size_t) __pure;
char *strncpy(char * __restrict, const char * __restrict, size_t);
char *(strncpy)(char * __restrict, const char * __restrict, size_t);
#if __POSIX_VISIBLE >= 200809
char *strndup(const char *, size_t) __malloc_like;
size_t strnlen(const char *, size_t) __pure;
@ -168,7 +172,4 @@ errno_t memset_s(void *, rsize_t, int, rsize_t);
#endif /* __EXT1_VISIBLE */
__END_DECLS
#if !defined(_STANDALONE) && defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
#include <ssp/string.h>
#endif
#endif /* _STRING_H_ */

11
include/strings.h
View File

@ -37,11 +37,15 @@ typedef __size_t size_t;
#define _SIZE_T_DECLARED
#endif
#if !defined(_STANDALONE) && defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
#include <ssp/strings.h>
#endif
__BEGIN_DECLS
#if __BSD_VISIBLE || __POSIX_VISIBLE <= 200112
int bcmp(const void *, const void *, size_t) __pure; /* LEGACY */
void bcopy(const void *, void *, size_t); /* LEGACY */
void bzero(void *, size_t); /* LEGACY */
void (bcopy)(const void *, void *, size_t); /* LEGACY */
void (bzero)(void *, size_t); /* LEGACY */
#endif
#if __BSD_VISIBLE
void explicit_bzero(void *, size_t);
@ -68,7 +72,4 @@ int strncasecmp(const char *, const char *, size_t) __pure;
#endif
__END_DECLS
#if !defined(_STANDALONE) && defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
#include <ssp/strings.h>
#endif
#endif /* _STRINGS_H_ */

2
lib/libc/amd64/string/strlcat.c
View File

@ -8,6 +8,8 @@
#include <string.h>
#undef strlcat /* FORTIFY_SOURCE */
void *__memchr(const void *, int, size_t);
size_t __strlcpy(char *restrict, const char *restrict, size_t);

5
lib/libc/gen/ctermid.c
View File

@ -34,11 +34,12 @@
#include <paths.h>
#include <stdio.h>
#include <string.h>
#include <ssp/ssp.h>
#define LEN_PATH_DEV (sizeof(_PATH_DEV) - 1)
char *
ctermid(char *s)
__ssp_real(ctermid)(char *s)
{
static char def[sizeof(_PATH_DEV) + SPECNAMELEN];
struct stat sb;
@ -62,7 +63,7 @@ ctermid(char *s)
}
char *
ctermid_r(char *s)
__ssp_real(ctermid_r)(char *s)
{
return (s != NULL ? ctermid(s) : NULL);

3
lib/libc/gen/getdomainname.c
View File

@ -33,9 +33,10 @@
#include <sys/sysctl.h>
#include <unistd.h>
#include <ssp/ssp.h>
int
getdomainname(char *name, int namelen)
__ssp_real(getdomainname)(char *name, int namelen)
{
int mib[2];
size_t size;

3
lib/libc/gen/getentropy.c
View File

@ -35,6 +35,7 @@
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <ssp/ssp.h>
#include "libc_private.h"
@ -105,7 +106,7 @@ getentropy_fallback(void *buf, size_t buflen)
}
int
getentropy(void *buf, size_t buflen)
__ssp_real(getentropy)(void *buf, size_t buflen)
{
ssize_t rd;
bool have_getrandom;

3
lib/libc/gen/getgrouplist.c
View File

@ -37,11 +37,12 @@
#include <grp.h>
#include <string.h>
#include <unistd.h>
#include <ssp/ssp.h>
extern int __getgroupmembership(const char *, gid_t, gid_t *, int, int *);
int
getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
__ssp_real(getgrouplist)(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
{
return __getgroupmembership(uname, agroup, groups, *grpcnt, grpcnt);
}

3
lib/libc/gen/gethostname.c
View File

@ -34,9 +34,10 @@
#include <errno.h>
#include <unistd.h>
#include <ssp/ssp.h>
int
gethostname(char *name, size_t namelen)
__ssp_real(gethostname)(char *name, size_t namelen)
{
int mib[2];

3
lib/libc/gen/getlogin.c
View File

@ -37,6 +37,7 @@
#include <unistd.h>
#include "namespace.h"
#include <pthread.h>
#include <ssp/ssp.h>
#include "un-namespace.h"
#include "libc_private.h"
@ -54,7 +55,7 @@ getlogin(void)
}
int
getlogin_r(char *logname, size_t namelen)
__ssp_real(getlogin_r)(char *logname, size_t namelen)
{
char tmpname[MAXLOGNAME];
int len;

3
lib/libc/gen/ttyname.c
View File

@ -42,6 +42,7 @@
#include <paths.h>
#include <errno.h>
#include "reentrant.h"
#include <ssp/ssp.h>
#include "un-namespace.h"
#include "libc_private.h"
@ -53,7 +54,7 @@ static thread_key_t ttyname_key;
static int ttyname_keycreated = 0;
int
ttyname_r(int fd, char *buf, size_t len)
__ssp_real(ttyname_r)(int fd, char *buf, size_t len)
{
size_t used;

4
lib/libc/secure/Makefile.inc
View File

@ -6,8 +6,8 @@
# _FORTIFY_SOURCE
SRCS+= fgets_chk.c memcpy_chk.c memmove_chk.c memset_chk.c \
snprintf_chk.c sprintf_chk.c stpcpy_chk.c stpncpy_chk.c \
strcat_chk.c strcpy_chk.c strncat_chk.c strncpy_chk.c \
vsnprintf_chk.c vsprintf_chk.c
strcat_chk.c strcpy_chk.c strlcat_chk.c strncat_chk.c strlcpy_chk.c \
strncpy_chk.c vsnprintf_chk.c vsprintf_chk.c
CFLAGS.snprintf_chk.c+= -Wno-unused-parameter
CFLAGS.sprintf_chk.c+= -Wno-unused-parameter

2
lib/libc/secure/Symbol.map
View File

@ -15,7 +15,9 @@ FBSD_1.8 {
__stpncpy_chk;
__strcat_chk;
__strcpy_chk;
__strlcat_chk;
__strncat_chk;
__strlcpy_chk;
__strncpy_chk;
__vsnprintf_chk;
__vsprintf_chk;

70
lib/libc/secure/strlcat_chk.c Normal file
View File

@ -0,0 +1,70 @@
/* $OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $ */
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <ssp/string.h>
/*
* Appends src to string dst of size dsize (unlike strncat, dsize is the
* full size of dst, not space left). At most dsize-1 characters
* will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
* Returns strlen(src) + MIN(dsize, strlen(initial dst)).
* If retval >= dsize, truncation occurred.
*/
size_t
__strlcat_chk(char * __restrict dst, const char * __restrict src, size_t dsize,
size_t dbufsize)
{
const char *odst = dst;
const char *osrc = src;
size_t n = dsize;
size_t dlen;
if (dsize > dbufsize)
__chk_fail();
/* Find the end of dst and adjust bytes left but don't go past end. */
while (n-- != 0 && *dst != '\0') {
dst++;
}
dlen = dst - odst;
n = dsize - dlen;
if (n-- == 0)
return (dlen + strlen(src));
while (*src != '\0') {
if (n != 0) {
if (dbufsize-- == 0)
__chk_fail();
*dst++ = *src;
n--;
}
src++;
}
if (dbufsize-- == 0)
__chk_fail();
*dst = '\0';
return (dlen + (src - osrc)); /* count does not include NUL */
}

43
lib/libc/secure/strlcpy_chk.c Normal file
View File

@ -0,0 +1,43 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024, Klara, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <string.h>
#include <ssp/string.h>
#undef strlcpy
size_t
__strlcpy_chk(char * __restrict dst, const char * __restrict src, size_t dsize,
size_t dbufsize)
{
if (dsize > dbufsize)
__chk_fail();
return (strlcpy(dst, src, dsize));
}

4
lib/libc/stdio/fread.c
View File

@ -37,6 +37,7 @@
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <ssp/ssp.h>
#include "un-namespace.h"
#include "local.h"
#include "libc_private.h"
@ -46,7 +47,8 @@
*/
size_t
fread(void * __restrict buf, size_t size, size_t count, FILE * __restrict fp)
__ssp_real(fread)(void * __restrict buf, size_t size, size_t count,
FILE * __restrict fp)
{
size_t ret;

3
lib/libc/stdio/gets_s.c
View File

@ -39,6 +39,7 @@
#include <unistd.h>
#include <stdint.h>
#include <stdio.h>
#include <ssp/ssp.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "local.h"
@ -77,7 +78,7 @@ _gets_s(char *buf, rsize_t n)
/* ISO/IEC 9899:2011 K.3.7.4.1 */
char *
gets_s(char *buf, rsize_t n)
__ssp_real(gets_s)(char *buf, rsize_t n)
{
char *ret;
if (buf == NULL) {

3
lib/libc/stdio/tmpnam.c
View File

@ -36,6 +36,7 @@
#include <stdio.h>
#include <unistd.h>
#include <ssp/ssp.h>
__warn_references(tmpnam,
"warning: tmpnam() possibly used unsafely; consider using mkstemp()");
@ -43,7 +44,7 @@ __warn_references(tmpnam,
extern char *_mktemp(char *);
char *
tmpnam(char *s)
__ssp_real(tmpnam)(char *s)
{
static u_long tmpcount;
static char buf[L_tmpnam];

4
lib/libc/string/mempcpy.c
View File

@ -29,9 +29,11 @@
*/
#include <string.h>
#include <ssp/ssp.h>
void *
mempcpy(void *__restrict dst, const void *__restrict src, size_t len)
__ssp_real(mempcpy)(void *__restrict dst, const void *__restrict src,
size_t len)
{
return ((char *)memcpy(dst, src, len) + len);
}

4
lib/libc/string/strerror.c
View File

@ -38,6 +38,8 @@
#include <string.h>
#include <stdio.h>
#include <ssp/ssp.h>
#include "errlst.h"
#include "../locale/xlocale_private.h"
#include "libc_private.h"
@ -114,7 +116,7 @@ __strerror_rl(int errnum, char *strerrbuf, size_t buflen, locale_t locale)
}
int
strerror_r(int errnum, char *strerrbuf, size_t buflen)
__ssp_real(strerror_r)(int errnum, char *strerrbuf, size_t buflen)
{
return (__strerror_rl(errnum, strerrbuf, buflen, __get_locale()));
}

2
lib/libc/string/strlcat.c
View File

@ -19,6 +19,8 @@
#include <sys/types.h>
#include <string.h>
#undef strlcat /* FORTIFY_SOURCE */
/*
* Appends src to string dst of size dsize (unlike strncat, dsize is the
* full size of dst, not space left). At most dsize-1 characters

2
lib/libc/string/strlcpy.c
View File

@ -19,6 +19,8 @@
#include <sys/types.h>
#include <string.h>
#undef strlcpy /* FORTIFY_SOURCE */
/*
* Copy string src to buffer dst of size dsize. At most dsize-1
* chars will be copied. Always NUL terminates (unless dsize == 0).

2
lib/libc/string/strncpy.c
View File

@ -34,6 +34,8 @@
#include <string.h>
#undef strncpy /* FORTIFY_SOURCE */
/*
* Copy src to dst, truncating or null-padding to always copy n bytes.
* Return dst.

990
lib/libc/tests/secure/fortify_stdio_test.c
View File

File diff suppressed because it is too large Load Diff

478
lib/libc/tests/secure/fortify_string_test.c
View File

@ -20,6 +20,23 @@
#include <unistd.h>
#include <atf-c.h>
static FILE * __unused
new_fp(size_t __len)
{
static char fpbuf[LINE_MAX];
FILE *fp;
ATF_REQUIRE(__len <= sizeof(fpbuf));
memset(fpbuf, 'A', sizeof(fpbuf) - 1);
fpbuf[sizeof(fpbuf) - 1] = '\0';
fp = fmemopen(fpbuf, sizeof(fpbuf), "rb");
ATF_REQUIRE(fp != NULL);
return (fp);
}
/*
* Create a new symlink to use for readlink(2) style tests, we'll just use a
* random target name to have something interesting to look at.
@ -79,6 +96,22 @@ disable_coredumps(void)
_exit(EX_OSERR);
}
/*
* Replaces stdin with a file that we can actually read from, for tests where
* we want a FILE * or fd that we can get data from.
*/
static void __unused
replace_stdin(void)
{
int fd;
fd = new_tmpfile();
(void)dup2(fd, STDIN_FILENO);
if (fd != STDIN_FILENO)
close(fd);
}
ATF_TC_WITHOUT_HEAD(memcpy_before_end);
ATF_TC_BODY(memcpy_before_end, tc)
{
@ -211,6 +244,138 @@ monitor:
}
ATF_TC_WITHOUT_HEAD(mempcpy_before_end);
ATF_TC_BODY(mempcpy_before_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
char src[__len + 10];
mempcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(mempcpy_end);
ATF_TC_BODY(mempcpy_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
char src[__len + 10];
mempcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(mempcpy_heap_before_end);
ATF_TC_BODY(mempcpy_heap_before_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
char src[__len + 10];
__stack.__buf = malloc(__bufsz);
mempcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(mempcpy_heap_end);
ATF_TC_BODY(mempcpy_heap_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
char src[__len + 10];
__stack.__buf = malloc(__bufsz);
mempcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(mempcpy_heap_after_end);
ATF_TC_BODY(mempcpy_heap_after_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 + 1;
const size_t __idx __unused = __len - 1;
pid_t __child;
int __status;
char src[__len + 10];
__child = fork();
ATF_REQUIRE(__child >= 0);
if (__child > 0)
goto monitor;
/* Child */
disable_coredumps();
__stack.__buf = malloc(__bufsz);
mempcpy(__stack.__buf, src, __len);
_exit(EX_SOFTWARE); /* Should have aborted. */
monitor:
while (waitpid(__child, &__status, 0) != __child) {
ATF_REQUIRE_EQ(EINTR, errno);
}
if (!WIFSIGNALED(__status)) {
switch (WEXITSTATUS(__status)) {
case EX_SOFTWARE:
atf_tc_fail("FORTIFY_SOURCE failed to abort");
break;
case EX_OSERR:
atf_tc_fail("setrlimit(2) failed");
break;
default:
atf_tc_fail("child exited with status %d",
WEXITSTATUS(__status));
}
} else {
ATF_REQUIRE_EQ(SIGABRT, WTERMSIG(__status));
}
#undef BUF
}
ATF_TC_WITHOUT_HEAD(memmove_before_end);
ATF_TC_BODY(memmove_before_end, tc)
{
@ -917,6 +1082,155 @@ monitor:
}
ATF_TC_WITHOUT_HEAD(strlcat_before_end);
ATF_TC_BODY(strlcat_before_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
char src[__len];
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcat(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcat_end);
ATF_TC_BODY(strlcat_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
char src[__len];
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcat(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcat_heap_before_end);
ATF_TC_BODY(strlcat_heap_before_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
char src[__len];
__stack.__buf = malloc(__bufsz);
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcat(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcat_heap_end);
ATF_TC_BODY(strlcat_heap_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
char src[__len];
__stack.__buf = malloc(__bufsz);
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcat(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcat_heap_after_end);
ATF_TC_BODY(strlcat_heap_after_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 + 1;
const size_t __idx __unused = __len - 1;
pid_t __child;
int __status;
char src[__len];
__child = fork();
ATF_REQUIRE(__child >= 0);
if (__child > 0)
goto monitor;
/* Child */
disable_coredumps();
__stack.__buf = malloc(__bufsz);
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcat(__stack.__buf, src, __len);
_exit(EX_SOFTWARE); /* Should have aborted. */
monitor:
while (waitpid(__child, &__status, 0) != __child) {
ATF_REQUIRE_EQ(EINTR, errno);
}
if (!WIFSIGNALED(__status)) {
switch (WEXITSTATUS(__status)) {
case EX_SOFTWARE:
atf_tc_fail("FORTIFY_SOURCE failed to abort");
break;
case EX_OSERR:
atf_tc_fail("setrlimit(2) failed");
break;
default:
atf_tc_fail("child exited with status %d",
WEXITSTATUS(__status));
}
} else {
ATF_REQUIRE_EQ(SIGABRT, WTERMSIG(__status));
}
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strncat_before_end);
ATF_TC_BODY(strncat_before_end, tc)
{
@ -1215,6 +1529,155 @@ monitor:
}
ATF_TC_WITHOUT_HEAD(strlcpy_before_end);
ATF_TC_BODY(strlcpy_before_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
char src[__len];
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcpy_end);
ATF_TC_BODY(strlcpy_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
char src[__len];
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcpy_heap_before_end);
ATF_TC_BODY(strlcpy_heap_before_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
char src[__len];
__stack.__buf = malloc(__bufsz);
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcpy_heap_end);
ATF_TC_BODY(strlcpy_heap_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
char src[__len];
__stack.__buf = malloc(__bufsz);
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcpy(__stack.__buf, src, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strlcpy_heap_after_end);
ATF_TC_BODY(strlcpy_heap_after_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 + 1;
const size_t __idx __unused = __len - 1;
pid_t __child;
int __status;
char src[__len];
__child = fork();
ATF_REQUIRE(__child >= 0);
if (__child > 0)
goto monitor;
/* Child */
disable_coredumps();
__stack.__buf = malloc(__bufsz);
memset(__stack.__buf, 0, __len);
memset(src, 'A', __len - 1);
src[__len - 1] = '\0';
strlcpy(__stack.__buf, src, __len);
_exit(EX_SOFTWARE); /* Should have aborted. */
monitor:
while (waitpid(__child, &__status, 0) != __child) {
ATF_REQUIRE_EQ(EINTR, errno);
}
if (!WIFSIGNALED(__status)) {
switch (WEXITSTATUS(__status)) {
case EX_SOFTWARE:
atf_tc_fail("FORTIFY_SOURCE failed to abort");
break;
case EX_OSERR:
atf_tc_fail("setrlimit(2) failed");
break;
default:
atf_tc_fail("child exited with status %d",
WEXITSTATUS(__status));
}
} else {
ATF_REQUIRE_EQ(SIGABRT, WTERMSIG(__status));
}
#undef BUF
}
ATF_TC_WITHOUT_HEAD(strncpy_before_end);
ATF_TC_BODY(strncpy_before_end, tc)
{
@ -1371,6 +1834,11 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, memcpy_heap_before_end);
ATF_TP_ADD_TC(tp, memcpy_heap_end);
ATF_TP_ADD_TC(tp, memcpy_heap_after_end);
ATF_TP_ADD_TC(tp, mempcpy_before_end);
ATF_TP_ADD_TC(tp, mempcpy_end);
ATF_TP_ADD_TC(tp, mempcpy_heap_before_end);
ATF_TP_ADD_TC(tp, mempcpy_heap_end);
ATF_TP_ADD_TC(tp, mempcpy_heap_after_end);
ATF_TP_ADD_TC(tp, memmove_before_end);
ATF_TP_ADD_TC(tp, memmove_end);
ATF_TP_ADD_TC(tp, memmove_heap_before_end);
@ -1396,6 +1864,11 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, strcat_heap_before_end);
ATF_TP_ADD_TC(tp, strcat_heap_end);
ATF_TP_ADD_TC(tp, strcat_heap_after_end);
ATF_TP_ADD_TC(tp, strlcat_before_end);
ATF_TP_ADD_TC(tp, strlcat_end);
ATF_TP_ADD_TC(tp, strlcat_heap_before_end);
ATF_TP_ADD_TC(tp, strlcat_heap_end);
ATF_TP_ADD_TC(tp, strlcat_heap_after_end);
ATF_TP_ADD_TC(tp, strncat_before_end);
ATF_TP_ADD_TC(tp, strncat_end);
ATF_TP_ADD_TC(tp, strncat_heap_before_end);
@ -1406,6 +1879,11 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, strcpy_heap_before_end);
ATF_TP_ADD_TC(tp, strcpy_heap_end);
ATF_TP_ADD_TC(tp, strcpy_heap_after_end);
ATF_TP_ADD_TC(tp, strlcpy_before_end);
ATF_TP_ADD_TC(tp, strlcpy_end);
ATF_TP_ADD_TC(tp, strlcpy_heap_before_end);
ATF_TP_ADD_TC(tp, strlcpy_heap_end);
ATF_TP_ADD_TC(tp, strlcpy_heap_after_end);
ATF_TP_ADD_TC(tp, strncpy_before_end);
ATF_TP_ADD_TC(tp, strncpy_end);
ATF_TP_ADD_TC(tp, strncpy_heap_before_end);

165
lib/libc/tests/secure/fortify_strings_test.c
View File

@ -20,6 +20,23 @@
#include <unistd.h>
#include <atf-c.h>
static FILE * __unused
new_fp(size_t __len)
{
static char fpbuf[LINE_MAX];
FILE *fp;
ATF_REQUIRE(__len <= sizeof(fpbuf));
memset(fpbuf, 'A', sizeof(fpbuf) - 1);
fpbuf[sizeof(fpbuf) - 1] = '\0';
fp = fmemopen(fpbuf, sizeof(fpbuf), "rb");
ATF_REQUIRE(fp != NULL);
return (fp);
}
/*
* Create a new symlink to use for readlink(2) style tests, we'll just use a
* random target name to have something interesting to look at.
@ -79,6 +96,22 @@ disable_coredumps(void)
_exit(EX_OSERR);
}
/*
* Replaces stdin with a file that we can actually read from, for tests where
* we want a FILE * or fd that we can get data from.
*/
static void __unused
replace_stdin(void)
{
int fd;
fd = new_tmpfile();
(void)dup2(fd, STDIN_FILENO);
if (fd != STDIN_FILENO)
close(fd);
}
ATF_TC_WITHOUT_HEAD(bcopy_before_end);
ATF_TC_BODY(bcopy_before_end, tc)
{
@ -338,6 +371,133 @@ monitor:
}
ATF_TC_WITHOUT_HEAD(explicit_bzero_before_end);
ATF_TC_BODY(explicit_bzero_before_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
explicit_bzero(__stack.__buf, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(explicit_bzero_end);
ATF_TC_BODY(explicit_bzero_end, tc)
{
#define BUF &__stack.__buf
struct {
uint8_t padding_l;
unsigned char __buf[42];
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(__stack.__buf);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
explicit_bzero(__stack.__buf, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(explicit_bzero_heap_before_end);
ATF_TC_BODY(explicit_bzero_heap_before_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 - 1;
const size_t __idx __unused = __len - 1;
__stack.__buf = malloc(__bufsz);
explicit_bzero(__stack.__buf, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(explicit_bzero_heap_end);
ATF_TC_BODY(explicit_bzero_heap_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42;
const size_t __idx __unused = __len - 1;
__stack.__buf = malloc(__bufsz);
explicit_bzero(__stack.__buf, __len);
#undef BUF
}
ATF_TC_WITHOUT_HEAD(explicit_bzero_heap_after_end);
ATF_TC_BODY(explicit_bzero_heap_after_end, tc)
{
#define BUF __stack.__buf
struct {
uint8_t padding_l;
unsigned char * __buf;
uint8_t padding_r;
} __stack;
const size_t __bufsz __unused = sizeof(*__stack.__buf) * (42);
const size_t __len = 42 + 1;
const size_t __idx __unused = __len - 1;
pid_t __child;
int __status;
__child = fork();
ATF_REQUIRE(__child >= 0);
if (__child > 0)
goto monitor;
/* Child */
disable_coredumps();
__stack.__buf = malloc(__bufsz);
explicit_bzero(__stack.__buf, __len);
_exit(EX_SOFTWARE); /* Should have aborted. */
monitor:
while (waitpid(__child, &__status, 0) != __child) {
ATF_REQUIRE_EQ(EINTR, errno);
}
if (!WIFSIGNALED(__status)) {
switch (WEXITSTATUS(__status)) {
case EX_SOFTWARE:
atf_tc_fail("FORTIFY_SOURCE failed to abort");
break;
case EX_OSERR:
atf_tc_fail("setrlimit(2) failed");
break;
default:
atf_tc_fail("child exited with status %d",
WEXITSTATUS(__status));
}
} else {
ATF_REQUIRE_EQ(SIGABRT, WTERMSIG(__status));
}
#undef BUF
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, bcopy_before_end);
@ -350,5 +510,10 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, bzero_heap_before_end);
ATF_TP_ADD_TC(tp, bzero_heap_end);
ATF_TP_ADD_TC(tp, bzero_heap_after_end);
ATF_TP_ADD_TC(tp, explicit_bzero_before_end);
ATF_TP_ADD_TC(tp, explicit_bzero_end);
ATF_TP_ADD_TC(tp, explicit_bzero_heap_before_end);
ATF_TP_ADD_TC(tp, explicit_bzero_heap_end);
ATF_TP_ADD_TC(tp, explicit_bzero_heap_after_end);
return (atf_no_error());
}

1462
lib/libc/tests/secure/fortify_unistd_test.c
View File

File diff suppressed because it is too large Load Diff

271
lib/libc/tests/secure/generate-fortify-tests.lua
View File

@ -96,6 +96,10 @@ local printf_init = [[
srcvar[sizeof(srcvar) - 1] = '\0';
]]
local stdio_init = [[
replace_stdin();
]]
local string_stackvars = "\tchar src[__len];\n"
local string_init = [[
memset(__stack.__buf, 0, __len);
@ -130,6 +134,53 @@ local string_init = [[
local all_tests = {
stdio = {
-- <stdio.h>
{
func = "ctermid",
bufsize = "L_ctermid",
arguments = {
"__buf",
},
exclude = excludes_stack_overflow,
},
{
func = "ctermid_r",
bufsize = "L_ctermid",
arguments = {
"__buf",
},
exclude = excludes_stack_overflow,
},
{
func = "fread",
arguments = {
"__buf",
"__len",
"1",
"stdin",
},
exclude = excludes_stack_overflow,
init = stdio_init,
},
{
func = "fread_unlocked",
arguments = {
"__buf",
"__len",
"1",
"stdin",
},
exclude = excludes_stack_overflow,
init = stdio_init,
},
{
func = "gets_s",
arguments = {
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
init = stdio_init,
},
{
func = "sprintf",
arguments = {
@ -155,6 +206,27 @@ local all_tests = {
stackvars = printf_stackvars,
init = printf_init,
},
{
func = "tmpnam",
bufsize = "L_tmpnam",
arguments = {
"__buf",
},
exclude = excludes_stack_overflow,
},
{
func = "fgets",
arguments = {
"__buf",
"__len",
"fp",
},
exclude = excludes_stack_overflow,
stackvars = "\tFILE *fp;\n",
init = [[
fp = new_fp(__len);
]],
},
},
string = {
-- <string.h>
@ -168,6 +240,16 @@ local all_tests = {
exclude = excludes_stack_overflow,
stackvars = "\tchar src[__len + 10];\n",
},
{
func = "mempcpy",
arguments = {
"__buf",
"src",
"__len",
},
exclude = excludes_stack_overflow,
stackvars = "\tchar src[__len + 10];\n",
},
{
func = "memmove",
arguments = {
@ -220,6 +302,17 @@ local all_tests = {
init = string_init,
uses_len = true,
},
{
func = "strlcat",
arguments = {
"__buf",
"src",
"__len",
},
exclude = excludes_stack_overflow,
stackvars = string_stackvars,
init = string_init,
},
{
func = "strncat",
arguments = {
@ -242,6 +335,17 @@ local all_tests = {
init = string_init,
uses_len = true,
},
{
func = "strlcpy",
arguments = {
"__buf",
"src",
"__len",
},
exclude = excludes_stack_overflow,
stackvars = string_stackvars,
init = string_init,
},
{
func = "strncpy",
arguments = {
@ -274,6 +378,14 @@ local all_tests = {
},
exclude = excludes_stack_overflow,
},
{
func = "explicit_bzero",
arguments = {
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
},
},
unistd = {
-- <unistd.h>
@ -286,6 +398,53 @@ local all_tests = {
},
exclude = excludes_stack_overflow,
},
{
func = "getgrouplist",
bufsize = "4",
buftype = "gid_t[]",
arguments = {
"\"root\"",
"0",
"__buf",
"&intlen",
},
exclude = excludes_stack_overflow,
stackvars = "\tint intlen = (int)__len;\n",
uses_len = true,
},
{
func = "getgroups",
bufsize = "4",
buftype = "gid_t[]",
arguments = {
"__len",
"__buf",
},
exclude = excludes_stack_overflow,
},
{
func = "getloginclass",
arguments = {
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
},
{
func = "pread",
bufsize = "41",
arguments = {
"fd",
"__buf",
"__len",
"0",
},
exclude = excludes_stack_overflow,
stackvars = "\tint fd;\n",
init = [[
fd = new_tmpfile(); /* Cannot fail */
]],
},
{
func = "read",
bufsize = "41",
@ -313,6 +472,85 @@ local all_tests = {
path = new_symlink(__len); /* Cannot fail */
]],
},
{
func = "readlinkat",
arguments = {
"AT_FDCWD",
"path",
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
stackvars = "\tconst char *path;\n",
init = [[
path = new_symlink(__len); /* Cannot fail */
]],
},
{
func = "getdomainname",
bufsize = "4",
arguments = {
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
stackvars = "\tchar sysdomain[256];\n",
early_init = [[
(void)getdomainname(sysdomain, __len);
if (strlen(sysdomain) <= __len)
atf_tc_skip("domain name too short for testing");
]]
},
{
func = "getentropy",
arguments = {
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
},
{
func = "gethostname",
bufsize = "4",
arguments = {
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
stackvars = [[
char syshost[256];
int error;
]],
early_init = [[
error = gethostname(syshost, __len);
if (error != 0 || strlen(syshost) <= __len)
atf_tc_skip("hostname too short for testing");
]]
},
{
func = "getlogin_r",
bufsize = "MAXLOGNAME + 1",
arguments = {
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
},
{
func = "ttyname_r",
arguments = {
"fd",
"__buf",
"__len",
},
exclude = excludes_stack_overflow,
stackvars = "\tint fd;\n",
early_init = [[
fd = STDIN_FILENO;
if (!isatty(fd))
atf_tc_skip("stdin is not an fd");
]]
},
},
}
@ -620,6 +858,23 @@ end
fh:write([[
static FILE * __unused
new_fp(size_t __len)
{
static char fpbuf[LINE_MAX];
FILE *fp;
ATF_REQUIRE(__len <= sizeof(fpbuf));
memset(fpbuf, 'A', sizeof(fpbuf) - 1);
fpbuf[sizeof(fpbuf) - 1] = '\0';
fp = fmemopen(fpbuf, sizeof(fpbuf), "rb");
ATF_REQUIRE(fp != NULL);
return (fp);
}
/*
* Create a new symlink to use for readlink(2) style tests, we'll just use a
* random target name to have something interesting to look at.
@ -679,6 +934,22 @@ disable_coredumps(void)
_exit(EX_OSERR);
}
/*
* Replaces stdin with a file that we can actually read from, for tests where
* we want a FILE * or fd that we can get data from.
*/
static void __unused
replace_stdin(void)
{
int fd;
fd = new_tmpfile();
(void)dup2(fd, STDIN_FILENO);
if (fd != STDIN_FILENO)
close(fd);
}
]])
for _, def in pairs(tests) do

4
lib/libutil/tests/trimdomain-nodomain_test.c
View File

@ -32,6 +32,8 @@
#include <string.h>
#include <unistd.h>
#include <ssp/ssp.h>
#define TESTDOMAIN ""
#define TESTHOST "testhost"
#define TESTFQDN "testhost" TESTDOMAIN
@ -45,7 +47,7 @@ int tests = 0;
* oddly configured systems.
*/
int
gethostname(char *name, size_t namelen)
__ssp_real(gethostname)(char *name, size_t namelen)
{
if (strlcpy(name, TESTFQDN, namelen) > namelen) {
errno = ENAMETOOLONG;

4
lib/libutil/tests/trimdomain_test.c
View File

@ -32,6 +32,8 @@
#include <string.h>
#include <unistd.h>
#include <ssp/ssp.h>
#define TESTDOMAIN ".domain.example.com"
#define TESTHOST "testhost"
#define TESTFQDN "testhost" TESTDOMAIN
@ -45,7 +47,7 @@ int tests = 0;
* oddly configured systems.
*/
int
gethostname(char *name, size_t namelen)
__ssp_real(gethostname)(char *name, size_t namelen)
{
if (strlcpy(name, TESTFQDN, namelen) > namelen) {
errno = ENAMETOOLONG;

3
sys/libkern/explicit_bzero.c
View File

@ -9,6 +9,7 @@
#include <sys/libkern.h>
#else
#include <string.h>
#include <ssp/ssp.h>
#endif /* _KERNEL */
__attribute__((weak)) void __explicit_bzero_hook(void *, size_t);
@ -19,7 +20,7 @@ __explicit_bzero_hook(void *buf, size_t len)
}
void
explicit_bzero(void *buf, size_t len)
__ssp_real(explicit_bzero)(void *buf, size_t len)
{
memset(buf, 0, len);
__explicit_bzero_hook(buf, len);

6
sys/sys/libkern.h
View File

@ -337,4 +337,10 @@ signed_extend32(uint32_t bitmap, int lsb, int width)
#define FNM_IGNORECASE FNM_CASEFOLD
#define FNM_FILE_NAME FNM_PATHNAME
#if __has_include(<ssp/ssp.h>)
#include <ssp/ssp.h> /* __ssp_real */
#else
#define __ssp_real(fun) fun
#endif
#endif /* !_SYS_LIBKERN_H_ */