/
2014-07-10_aslr.patch
3218 lines (3030 loc) · 90.7 KB
/
2014-07-10_aslr.patch
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diff --git a/lib/libugidfw/ugidfw.c b/lib/libugidfw/ugidfw.c
index 0dc423d..070cd0e 100644
--- a/lib/libugidfw/ugidfw.c
+++ b/lib/libugidfw/ugidfw.c
@@ -36,6 +36,9 @@
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/sysctl.h>
#include <security/mac_bsdextended/mac_bsdextended.h>
@@ -44,6 +47,8 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
#include "ugidfw.h"
@@ -195,7 +200,7 @@ bsde_rule_to_string(struct mac_bsdextended_rule *rule, char *buf, size_t buflen)
cur += len;
}
if (rule->mbr_subject.mbs_flags & MBS_PRISON_DEFINED) {
- len = snprintf(cur, left, "jailid %d ",
+ len = snprintf(cur, left, "jailid %d ",
rule->mbr_subject.mbs_prison);
if (len < 0 || len > left)
goto truncated;
@@ -329,14 +334,19 @@ bsde_rule_to_string(struct mac_bsdextended_rule *rule, char *buf, size_t buflen)
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_FSID_DEFINED) {
- numfs = getmntinfo(&mntbuf, MNT_NOWAIT);
- for (i = 0; i < numfs; i++)
- if (memcmp(&(rule->mbr_object.mbo_fsid),
- &(mntbuf[i].f_fsid),
- sizeof(mntbuf[i].f_fsid)) == 0)
- break;
- len = snprintf(cur, left, "filesys %s ",
- i == numfs ? "???" : mntbuf[i].f_mntonname);
+ if (rule->mbr_object.mbo_inode == 0) {
+ numfs = getmntinfo(&mntbuf, MNT_NOWAIT);
+ for (i = 0; i < numfs; i++)
+ if (memcmp(&(rule->mbr_object.mbo_fsid),
+ &(mntbuf[i].f_fsid),
+ sizeof(mntbuf[i].f_fsid)) == 0)
+ break;
+ len = snprintf(cur, left, "filesys %s ",
+ i == numfs ? "???" : mntbuf[i].f_mntonname);
+ } else {
+ len = snprintf(cur, left, "filesys %s ",
+ rule->mbr_object.mbo_paxpath);
+ }
if (len < 0 || len > left)
goto truncated;
left -= len;
@@ -500,6 +510,33 @@ bsde_rule_to_string(struct mac_bsdextended_rule *rule, char *buf, size_t buflen)
cur += len;
}
+ if (rule->mbr_pax) {
+ len = snprintf(cur, left, " paxflags ");
+ if (len < 0 || len > left)
+ goto truncated;
+ left -= len;
+ cur += len;
+
+ if (rule->mbr_pax & MBI_FORCE_ASLR_ENABLED) {
+ len = snprintf(cur, left, "A");
+ if (len < 0 || len > left)
+ goto truncated;
+
+ left -= len;
+ cur += len;
+ }
+
+ if (rule->mbr_pax & MBI_FORCE_ASLR_DISABLED) {
+ len = snprintf(cur, left, "a");
+ if (len < 0 || len > left)
+ goto truncated;
+
+ left -= len;
+ cur += len;
+ }
+
+ }
+
return (0);
truncated:
@@ -507,8 +544,8 @@ truncated:
}
int
-bsde_parse_uidrange(char *spec, uid_t *min, uid_t *max,
- size_t buflen, char *errstr){
+bsde_parse_uidrange(char *spec, uid_t *min, uid_t *max, size_t buflen, char *errstr)
+{
struct passwd *pwd;
uid_t uid1, uid2;
char *spec1, *spec2, *endp;
@@ -556,8 +593,8 @@ bsde_parse_uidrange(char *spec, uid_t *min, uid_t *max,
}
int
-bsde_parse_gidrange(char *spec, gid_t *min, gid_t *max,
- size_t buflen, char *errstr){
+bsde_parse_gidrange(char *spec, gid_t *min, gid_t *max, size_t buflen, char *errstr)
+{
struct group *grp;
gid_t gid1, gid2;
char *spec1, *spec2, *endp;
@@ -759,17 +796,22 @@ bsde_parse_type(char *spec, int *type, size_t buflen, char *errstr)
len = snprintf(errstr, buflen, "Unknown type code: %c",
spec[i]);
return (-1);
- }
+ }
}
return (0);
}
int
-bsde_parse_fsid(char *spec, struct fsid *fsid, size_t buflen, char *errstr)
+bsde_parse_fsid(char *spec, struct fsid *fsid, ino_t *inode, size_t buflen, char *errstr)
{
size_t len;
struct statfs buf;
+ struct stat sb;
+ int fd, paxstatus;
+ size_t bufsz;
+
+ *inode = 0;
if (statfs(spec, &buf) < 0) {
len = snprintf(errstr, buflen, "Unable to get id for %s: %s",
@@ -779,6 +821,21 @@ bsde_parse_fsid(char *spec, struct fsid *fsid, size_t buflen, char *errstr)
*fsid = buf.f_fsid;
+ if (strcmp(buf.f_fstypename, "devfs") != 0) {
+ bufsz = sizeof(int);
+ if (!sysctlbyname("kern.features.aslr", &paxstatus, &bufsz,
+ NULL, 0)) {
+ fd = open(spec, O_RDONLY);
+ if (fd != -1) {
+ if (fstat(fd, &sb) == 0)
+ if(S_ISDIR(sb.st_mode) == 0)
+ *inode = sb.st_ino;
+
+ close(fd);
+ }
+ }
+ }
+
return (0);
}
@@ -852,13 +909,18 @@ bsde_parse_object(int argc, char *argv[],
return (-1);
}
if (bsde_parse_fsid(argv[current+1], &fsid,
- buflen, errstr) < 0)
+ &object->mbo_inode, buflen, errstr) < 0)
return (-1);
flags |= MBO_FSID_DEFINED;
if (nextnot) {
neg ^= MBO_FSID_DEFINED;
nextnot = 0;
}
+ if (object->mbo_inode)
+ snprintf(object->mbo_paxpath, MAXPATHLEN, "%s",
+ argv[current+1]);
+ else
+ memset(object->mbo_paxpath, 0x00, MAXPATHLEN);
current += 2;
} else if (strcmp(argv[current], "suid") == 0) {
flags |= MBO_SUID;
@@ -984,7 +1046,42 @@ bsde_parse_mode(int argc, char *argv[], mode_t *mode, size_t buflen,
len = snprintf(errstr, buflen, "Unknown mode letter: %c",
argv[0][i]);
return (-1);
- }
+ }
+ }
+
+ return (0);
+}
+
+int
+bsde_parse_paxflags(int argc, char *argv[], uint32_t *pax, size_t buflen, char *errstr)
+{
+ size_t len;
+ int i;
+
+ if (argc == 0) {
+ len = snprintf(errstr, buflen, "paxflags expects mode value");
+ return (-1);
+ }
+
+ if (argc != 1) {
+ len = snprintf(errstr, buflen, "'%s' unexpected", argv[1]);
+ return (-1);
+ }
+
+ *pax = 0;
+ for (i = 0; i < strlen(argv[0]); i++) {
+ switch (argv[0][i]) {
+ case 'A':
+ *pax |= MBI_FORCE_ASLR_ENABLED;
+ break;
+ case 'a':
+ *pax |= MBI_FORCE_ASLR_DISABLED;
+ break;
+ default:
+ len = snprintf(errstr, buflen, "Unknown mode letter: %c",
+ argv[0][i]);
+ return (-1);
+ }
}
return (0);
@@ -997,6 +1094,7 @@ bsde_parse_rule(int argc, char *argv[], struct mac_bsdextended_rule *rule,
int subject, subject_elements, subject_elements_length;
int object, object_elements, object_elements_length;
int mode, mode_elements, mode_elements_length;
+ int paxflags, paxflags_elements, paxflags_elements_length=0;
int error, i;
size_t len;
@@ -1037,11 +1135,23 @@ bsde_parse_rule(int argc, char *argv[], struct mac_bsdextended_rule *rule,
return (-1);
}
+ /* Search forward for paxflags */
+ paxflags = -1;
+ for (i = 1; i < argc; i++)
+ if (strcmp(argv[i], "paxflags") == 0)
+ paxflags = i;
+
+ if (paxflags >= 0) {
+ paxflags_elements = paxflags + 1;
+ paxflags_elements_length = argc - paxflags_elements;
+ }
+
subject_elements_length = object - subject - 1;
object_elements = object + 1;
object_elements_length = mode - object_elements;
mode_elements = mode + 1;
- mode_elements_length = argc - mode_elements;
+ mode_elements_length = argc - mode_elements -
+ (paxflags_elements_length ? paxflags_elements_length+1 : 0);
error = bsde_parse_subject(subject_elements_length,
argv + subject_elements, &rule->mbr_subject, buflen, errstr);
@@ -1058,6 +1168,13 @@ bsde_parse_rule(int argc, char *argv[], struct mac_bsdextended_rule *rule,
if (error)
return (-1);
+ if (paxflags >= 0) {
+ error = bsde_parse_paxflags(paxflags_elements_length, argv + paxflags_elements,
+ &rule->mbr_pax, buflen, errstr);
+ if (error)
+ return (-1);
+ }
+
return (0);
}
diff --git a/lib/libugidfw/ugidfw.h b/lib/libugidfw/ugidfw.h
index 5b7fcf2..cef469c 100644
--- a/lib/libugidfw/ugidfw.h
+++ b/lib/libugidfw/ugidfw.h
@@ -39,6 +39,8 @@ int bsde_rule_to_string(struct mac_bsdextended_rule *rule, char *buf,
size_t buflen);
int bsde_parse_mode(int argc, char *argv[], mode_t *mode, size_t buflen,
char *errstr);
+int bsde_parse_paxflags(int argc, char *argv[], uint32_t *pax, size_t buflen,
+ char *errstr);
int bsde_parse_rule(int argc, char *argv[],
struct mac_bsdextended_rule *rule, size_t buflen, char *errstr);
int bsde_parse_rule_string(const char *string,
diff --git a/sys/amd64/amd64/elf_machdep.c b/sys/amd64/amd64/elf_machdep.c
index fdc4d56..ffb5e31 100644
--- a/sys/amd64/amd64/elf_machdep.c
+++ b/sys/amd64/amd64/elf_machdep.c
@@ -26,12 +26,17 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include "opt_pax.h"
+
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/linker.h>
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
#include <sys/proc.h>
#include <sys/sysent.h>
#include <sys/imgact_elf.h>
@@ -81,6 +86,11 @@ struct sysentvec elf64_freebsd_sysvec = {
.sv_shared_page_base = SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init,
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h
index bda9722..5e83a8f 100644
--- a/sys/amd64/include/vmparam.h
+++ b/sys/amd64/include/vmparam.h
@@ -170,7 +170,7 @@
#define VM_MAXUSER_ADDRESS UVADDR(NUPML4E, 0, 0, 0)
#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
-#define USRSTACK SHAREDPAGE
+#define USRSTACK (SHAREDPAGE - 4*PAGE_SIZE)
#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
#define VM_MIN_ADDRESS (0)
diff --git a/sys/amd64/linux32/linux32_sysvec.c b/sys/amd64/linux32/linux32_sysvec.c
index c06ce11..f4f99f58 100644
--- a/sys/amd64/linux32/linux32_sysvec.c
+++ b/sys/amd64/linux32/linux32_sysvec.c
@@ -33,6 +33,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
+#include "opt_pax.h"
#ifndef COMPAT_FREEBSD32
#error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!"
@@ -84,6 +85,10 @@ __FBSDID("$FreeBSD$");
#include <compat/linux/linux_signal.h>
#include <compat/linux/linux_util.h>
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
MODULE_VERSION(linux, 1);
MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
@@ -1037,6 +1042,11 @@ struct sysentvec elf_linux_sysvec = {
.sv_shared_page_base = LINUX32_SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = linux_schedtail,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init32,
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
INIT_SYSENTVEC(elf_sysvec, &elf_linux_sysvec);
diff --git a/sys/arm/arm/elf_machdep.c b/sys/arm/arm/elf_machdep.c
index 8ef9bd4..26e37e6 100644
--- a/sys/arm/arm/elf_machdep.c
+++ b/sys/arm/arm/elf_machdep.c
@@ -26,6 +26,8 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include "opt_pax.h"
+
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
@@ -46,6 +48,10 @@ __FBSDID("$FreeBSD$");
#include <machine/elf.h>
#include <machine/md_var.h>
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
struct sysentvec elf32_freebsd_sysvec = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = sysent,
@@ -79,6 +85,11 @@ struct sysentvec elf32_freebsd_sysvec = {
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_schedtail = NULL,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init,
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
static Elf32_Brandinfo freebsd_brand_info = {
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index 815a9b7..e92453f 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -30,6 +30,7 @@ __FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include "opt_inet.h"
#include "opt_inet6.h"
+#include "opt_pax.h"
#define __ELF_WORD_SIZE 32
@@ -113,6 +114,10 @@ __FBSDID("$FreeBSD$");
FEATURE(compat_freebsd_32bit, "Compatible with 32-bit FreeBSD");
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
#ifndef __mips__
CTASSERT(sizeof(struct timeval32) == 8);
CTASSERT(sizeof(struct timespec32) == 8);
@@ -2766,6 +2771,10 @@ freebsd32_copyout_strings(struct image_params *imgp)
szsigcode = 0;
destp = (uintptr_t)arginfo;
+#ifdef PAX_ASLR
+ pax_aslr_stack(curthread, &destp);
+#endif
+
/*
* install sigcode
*/
diff --git a/sys/compat/ia32/ia32_sysvec.c b/sys/compat/ia32/ia32_sysvec.c
index 770bbbf..67ad330 100644
--- a/sys/compat/ia32/ia32_sysvec.c
+++ b/sys/compat/ia32/ia32_sysvec.c
@@ -29,6 +29,7 @@
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
+#include "opt_pax.h"
#define __ELF_WORD_SIZE 32
@@ -74,6 +75,10 @@ __FBSDID("$FreeBSD$");
#include <machine/pcb.h>
#include <machine/cpufunc.h>
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
CTASSERT(sizeof(struct ia32_mcontext) == 640);
CTASSERT(sizeof(struct ia32_ucontext) == 704);
CTASSERT(sizeof(struct ia32_sigframe) == 800);
@@ -136,6 +141,11 @@ struct sysentvec ia32_freebsd_sysvec = {
.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init32,
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index 6959425..bd6af74 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -2986,3 +2986,7 @@ options RANDOM_RWFILE # Read and write entropy cache
# Module to enable execution of application via emulators like QEMU
options IMAGACT_BINMISC
+
+# Address Space Layout Randomization (ASLR)
+options PAX_ASLR
+options PAX_SYSCTLS
diff --git a/sys/conf/files b/sys/conf/files
index 64101d1..71f8c1a 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -2908,6 +2908,9 @@ kern/kern_mtxpool.c standard
kern/kern_mutex.c standard
kern/kern_ntptime.c standard
kern/kern_osd.c standard
+kern/kern_pax.c optional pax_aslr
+kern/kern_pax_aslr.c optional pax_aslr
+kern/kern_pax_log.c optional pax_aslr
kern/kern_physio.c standard
kern/kern_pmc.c standard
kern/kern_poll.c optional device_polling
diff --git a/sys/conf/options b/sys/conf/options
index 8ec07e0..180f169 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -920,6 +920,12 @@ RACCT opt_global.h
# Resource Limits
RCTL opt_global.h
+# PaX - hardening options
+PAX_ASLR opt_pax.h
+PAX_ASLR_MAX_SEC opt_pax.h
+PAX_MPROTECT opt_pax.h
+PAX_SYSCTLS opt_pax.h
+
# Random number generator(s)
RANDOM_YARROW opt_random.h
RANDOM_FORTUNA opt_random.h
diff --git a/sys/i386/i386/elf_machdep.c b/sys/i386/i386/elf_machdep.c
index 034b4c4..9571252 100644
--- a/sys/i386/i386/elf_machdep.c
+++ b/sys/i386/i386/elf_machdep.c
@@ -26,6 +26,8 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include "opt_pax.h"
+
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
@@ -46,6 +48,10 @@ __FBSDID("$FreeBSD$");
#include <machine/elf.h>
#include <machine/md_var.h>
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
struct sysentvec elf32_freebsd_sysvec = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = sysent,
@@ -81,6 +87,11 @@ struct sysentvec elf32_freebsd_sysvec = {
.sv_shared_page_base = SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init,
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
diff --git a/sys/i386/ibcs2/ibcs2_sysvec.c b/sys/i386/ibcs2/ibcs2_sysvec.c
index 5d007c7..1bb9d89 100644
--- a/sys/i386/ibcs2/ibcs2_sysvec.c
+++ b/sys/i386/ibcs2/ibcs2_sysvec.c
@@ -31,6 +31,8 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include "opt_pax.h"
+
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
@@ -50,6 +52,10 @@ __FBSDID("$FreeBSD$");
#include <i386/ibcs2/ibcs2_syscall.h>
#include <i386/ibcs2/ibcs2_signal.h>
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
MODULE_VERSION(ibcs2, 1);
extern int bsd_to_ibcs2_errno[];
@@ -89,6 +95,11 @@ struct sysentvec ibcs2_svr3_sysvec = {
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = NULL,
.sv_schedtail = NULL,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init, /* XXXOP */
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
static int
diff --git a/sys/i386/linux/linux_sysvec.c b/sys/i386/linux/linux_sysvec.c
index 0ad6791..403070c 100644
--- a/sys/i386/linux/linux_sysvec.c
+++ b/sys/i386/linux/linux_sysvec.c
@@ -29,6 +29,8 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include "opt_pax.h"
+
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
@@ -72,6 +74,10 @@ __FBSDID("$FreeBSD$");
#include <compat/linux/linux_signal.h>
#include <compat/linux/linux_util.h>
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
MODULE_VERSION(linux, 1);
MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
@@ -974,6 +980,11 @@ struct sysentvec linux_sysvec = {
.sv_shared_page_base = LINUX_SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = linux_schedtail,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init, /* XXXOP */
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
@@ -1012,6 +1023,11 @@ struct sysentvec elf_linux_sysvec = {
.sv_shared_page_base = LINUX_SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = linux_schedtail,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init,
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
INIT_SYSENTVEC(elf_sysvec, &elf_linux_sysvec);
diff --git a/sys/kern/imgact_aout.c b/sys/kern/imgact_aout.c
index 3ae78de..aac03f1 100644
--- a/sys/kern/imgact_aout.c
+++ b/sys/kern/imgact_aout.c
@@ -27,6 +27,8 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include "opt_pax.h"
+
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/imgact.h>
@@ -62,6 +64,10 @@ __FBSDID("$FreeBSD$");
#include <compat/ia32/ia32_signal.h>
#endif
+#ifdef PAX_ASLR
+#include <sys/pax.h>
+#endif
+
static int exec_aout_imgact(struct image_params *imgp);
static int aout_fixup(register_t **stack_base, struct image_params *imgp);
@@ -99,6 +105,11 @@ struct sysentvec aout_sysvec = {
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_schedtail = NULL,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init, /* XXXOP */
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
#elif defined(__amd64__)
@@ -143,6 +154,11 @@ struct sysentvec aout_sysvec = {
.sv_set_syscall_retval = ia32_set_syscall_retval,
.sv_fetch_syscall_args = ia32_fetch_syscall_args,
.sv_syscallnames = freebsd32_syscallnames,
+#ifdef PAX_ASLR
+ .sv_pax_aslr_init = _pax_aslr_init32, /* XXXOP */
+#else
+ .sv_pax_aslr_init = NULL,
+#endif
};
#else
#error "Port me"
diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
index 6342119..fe2976d 100644
--- a/sys/kern/imgact_elf.c
+++ b/sys/kern/imgact_elf.c
@@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
#include "opt_capsicum.h"
#include "opt_compat.h"
#include "opt_core.h"
+#include "opt_pax.h"
#include <sys/param.h>
#include <sys/capsicum.h>
@@ -48,6 +49,7 @@ __FBSDID("$FreeBSD$");
#include <sys/mman.h>
#include <sys/namei.h>
#include <sys/pioctl.h>
+#include <sys/jail.h>
#include <sys/proc.h>
#include <sys/procfs.h>
#include <sys/racct.h>
@@ -81,6 +83,10 @@ __FBSDID("$FreeBSD$");
#include <machine/elf.h>
#include <machine/md_var.h>
+#if defined(PAX_ASLR)
+#include <sys/pax.h>
+#endif
+
#define ELF_NOTE_ROUNDSIZE 4
#define OLD_EI_BRAND 8
@@ -653,16 +659,16 @@ __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
hdr = (const Elf_Ehdr *)imgp->image_header;
if ((error = __elfN(check_header)(hdr)) != 0)
goto fail;
- if (hdr->e_type == ET_DYN)
+ if (hdr->e_type == ET_DYN) {
rbase = *addr;
- else if (hdr->e_type == ET_EXEC)
+ } else if (hdr->e_type == ET_EXEC) {
rbase = 0;
- else {
+ } else {
error = ENOEXEC;
goto fail;
}
- /* Only support headers that fit within first page for now */
+ /* Only support headers that fit within first page for now */
if ((hdr->e_phoff > PAGE_SIZE) ||
(u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
error = ENOEXEC;
@@ -787,16 +793,7 @@ __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
if (hdr->e_type == ET_DYN) {
if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
return (ENOEXEC);
- /*
- * Honour the base load address from the dso if it is
- * non-zero for some reason.
- */
- if (baddr == 0)
- et_dyn_addr = ET_DYN_LOAD_ADDR;
- else
- et_dyn_addr = 0;
- } else
- et_dyn_addr = 0;
+ }
sv = brand_info->sysvec;
if (interp != NULL && brand_info->interp_newpath != NULL)
newinterp = brand_info->interp_newpath;
@@ -817,6 +814,21 @@ __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
error = exec_new_vmspace(imgp, sv);
imgp->proc->p_sysent = sv;
+ et_dyn_addr = 0;
+ if (hdr->e_type == ET_DYN) {
+ /*
+ * Honour the base load address from the dso if it is
+ * non-zero for some reason.
+ */
+ if (baddr == 0) {
+ et_dyn_addr = ET_DYN_LOAD_ADDR;
+#ifdef PAX_ASLR
+ if (pax_aslr_active(NULL, imgp->proc))
+ et_dyn_addr += imgp->proc->p_vmspace->vm_aslr_delta_exec;
+#endif
+ }
+ }
+
vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
if (error)
return (error);
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 141d438..9301b57 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -410,6 +410,7 @@ struct sysentvec null_sysvec = {
.sv_fetch_syscall_args = null_fetch_syscall_args,
.sv_syscallnames = NULL,
.sv_schedtail = NULL,
+ .sv_pax_aslr_init = NULL,
};
/*
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index 489096b..81a451f 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -30,6 +30,7 @@ __FBSDID("$FreeBSD$");
#include "opt_capsicum.h"
#include "opt_hwpmc_hooks.h"
#include "opt_ktrace.h"
+#include "opt_pax.h"
#include "opt_vm.h"
#include <sys/param.h>
@@ -93,6 +94,10 @@ __FBSDID("$FreeBSD$");
dtrace_execexit_func_t dtrace_fasttrap_exec;
#endif
+#if defined(PAX_ASLR)
+#include <sys/pax.h>
+#endif
+
SDT_PROVIDER_DECLARE(proc);
SDT_PROBE_DEFINE1(proc, kernel, , exec, "char *");
SDT_PROBE_DEFINE1(proc, kernel, , exec__failure, "int");
@@ -402,6 +407,11 @@ do_execve(td, args, mac_p)
imgp->pagesizes = 0;
imgp->pagesizeslen = 0;
imgp->stack_prot = 0;
+ imgp->pax_flags = 0;
+
+#if defined(PAX_MPROTECT) || defined(PAX_ASLR)
+ pax_elf(imgp, 0);
+#endif
#ifdef MAC
error = mac_execve_enter(imgp, mac_p);
@@ -1065,6 +1075,10 @@ exec_new_vmspace(imgp, sv)
map = &vmspace->vm_map;
}
+#ifdef PAX_ASLR
+ pax_aslr_init(curthread, imgp);
+#endif
+
/* Map a shared page */
obj = sv->sv_shared_page_obj;
if (obj != NULL) {
@@ -1099,6 +1113,9 @@ exec_new_vmspace(imgp, sv)
*/
vmspace->vm_ssize = sgrowsiz >> PAGE_SHIFT;
vmspace->vm_maxsaddr = (char *)sv->sv_usrstack - ssiz;
+#ifdef PAX_ASLR
+ vmspace->vm_maxsaddr -= vmspace->vm_aslr_delta_stack;
+#endif
return (0);
}
@@ -1258,6 +1275,9 @@ exec_copyout_strings(imgp)
szsigcode = *(p->p_sysent->sv_szsigcode);
}
destp = (uintptr_t)arginfo;
+#ifdef PAX_ASLR
+ pax_aslr_stack(curthread, &destp);
+#endif
/*
* install sigcode
diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index 8135afb..9577013 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -513,6 +513,11 @@ do_fork(struct thread *td, int flags, struct proc *p2, struct thread *td2,
}
/*
+ * XXXOP: this is the right place?
+ */
+ p2->p_pax = p1->p_pax;
+
+ /*
* p_limit is copy-on-write. Bump its refcount.
*/
lim_fork(p1, p2);
diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c
index 47cd568..d9036bd 100644
--- a/sys/kern/kern_jail.c
+++ b/sys/kern/kern_jail.c
@@ -33,6 +33,7 @@ __FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_inet.h"
#include "opt_inet6.h"
+#include "opt_pax.h"
#include <sys/param.h>
#include <sys/types.h>
@@ -74,6 +75,10 @@ __FBSDID("$FreeBSD$");
#endif /* INET6 */
#endif /* DDB */
+#if defined(PAX_ASLR)
+#include <sys/pax.h>
+#endif
+
#include <security/mac/mac_framework.h>
#define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
@@ -117,6 +122,10 @@ struct prison prison0 = {
};
MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
+#if defined(PAX_ASLR)
+SYSINIT(pax, SI_SUB_PAX, SI_ORDER_MIDDLE, pax_init_prison, (void *) &prison0);
+#endif
+
/* allprison, allprison_racct and lastprid are protected by allprison_lock. */
struct sx allprison_lock;
SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
@@ -1307,6 +1316,10 @@ kern_jail_set(struct thread *td, struct uio *optuio, int flags)
goto done_releroot;
}
+#if defined(PAX_ASLR)
+ pax_init_prison(pr);
+#endif
+
mtx_lock(&pr->pr_mtx);
/*
* New prisons do not yet have a reference, because we do not
diff --git a/sys/kern/kern_pax.c b/sys/kern/kern_pax.c
new file mode 100644
index 0000000..1bd5ad0
--- /dev/null
+++ b/sys/kern/kern_pax.c
@@ -0,0 +1,214 @@
+/*-
+ * Copyright (c) 2006 Elad Efrat <elad@NetBSD.org>
+ * Copyright (c) 2013-2014, by Oliver Pinter <oliver.pntr at gmail.com>
+ * Copyright (c) 2014, by Shawn Webb <lattera at gmail.com>
+ * All rights reserved.
+ *
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_compat.h"
+#include "opt_pax.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/imgact.h>
+#include <sys/imgact_elf.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sysent.h>
+#include <sys/stat.h>
+#include <sys/proc.h>
+#include <sys/elf_common.h>
+#include <sys/mount.h>
+#include <sys/sysctl.h>
+#include <sys/vnode.h>
+#include <sys/queue.h>
+#include <sys/libkern.h>
+#include <sys/jail.h>
+
+#include <sys/mman.h>
+#include <sys/libkern.h>
+#include <sys/exec.h>
+#include <sys/kthread.h>
+
+#include <sys/syslimits.h>
+#include <sys/param.h>
+
+#include <vm/pmap.h>
+#include <vm/vm_map.h>
+#include <vm/vm_extern.h>
+
+#include <machine/elf.h>
+
+#include <sys/pax.h>
+
+#include <security/mac_bsdextended/mac_bsdextended.h>
+
+SYSCTL_NODE(_security, OID_AUTO, pax, CTLFLAG_RD, 0,
+ "PaX (exploit mitigation) features.");
+
+struct prison *
+pax_get_prison(struct thread *td, struct proc *proc)