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Become maintainer, add hardening tests for use-after-free and atomic wrapping. 

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Merge tag 'lkdtm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into char-misc-testing

Kees writes:

Become maintainer, add hardening tests for use-after-free and atomic wrapping.
This commit is contained in:
Greg Kroah-Hartman 2016-03-01 16:51:19 -08:00
parent 449a97d07a 7c0ae5be82
commit d74e026ae5
15 changed files with 399 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/watchdog/watchdog-parameters.txt
View File

@ -400,3 +400,7 @@ wm8350_wdt:
nowayout: Watchdog cannot be stopped once started
(default=kernel config parameter)
-------------------------------------------------
sun4v_wdt:
timeout_ms: Watchdog timeout in milliseconds 1..180000, default=60000)
nowayout: Watchdog cannot be stopped once started
-------------------------------------------------

5
MAINTAINERS
View File

@ -6581,6 +6581,11 @@ F: samples/livepatch/
L: live-patching@vger.kernel.org
T: git git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching.git
LINUX KERNEL DUMP TEST MODULE (LKDTM)
M: Kees Cook <keescook@chromium.org>
S: Maintained
F: drivers/misc/lkdtm.c
LLC (802.2)
M: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
S: Maintained

6
arch/sparc/Makefile
View File

@ -24,7 +24,13 @@ LDFLAGS := -m elf32_sparc
export BITS := 32
UTS_MACHINE := sparc
# We are adding -Wa,-Av8 to KBUILD_CFLAGS to deal with a specs bug in some
# versions of gcc. Some gcc versions won't pass -Av8 to binutils when you
# give -mcpu=v8. This silently worked with older bintutils versions but
# does not any more.
KBUILD_CFLAGS += -m32 -mcpu=v8 -pipe -mno-fpu -fcall-used-g5 -fcall-used-g7
KBUILD_CFLAGS += -Wa,-Av8
KBUILD_AFLAGS += -m32 -Wa,-Av8
else

3
arch/sparc/include/uapi/asm/unistd.h
View File

@ -422,8 +422,9 @@
#define __NR_listen 354
#define __NR_setsockopt 355
#define __NR_mlock2 356
#define __NR_copy_file_range 357
#define NR_syscalls 357
#define NR_syscalls 358
/* Bitmask values returned from kern_features system call. */
#define KERN_FEATURE_MIXED_MODE_STACK 0x00000001

17
arch/sparc/kernel/entry.S
View File

@ -948,7 +948,24 @@ linux_syscall_trace:
cmp %o0, 0
bne 3f
mov -ENOSYS, %o0
/* Syscall tracing can modify the registers. */
ld [%sp + STACKFRAME_SZ + PT_G1], %g1
sethi %hi(sys_call_table), %l7
ld [%sp + STACKFRAME_SZ + PT_I0], %i0
or %l7, %lo(sys_call_table), %l7
ld [%sp + STACKFRAME_SZ + PT_I1], %i1
ld [%sp + STACKFRAME_SZ + PT_I2], %i2
ld [%sp + STACKFRAME_SZ + PT_I3], %i3
ld [%sp + STACKFRAME_SZ + PT_I4], %i4
ld [%sp + STACKFRAME_SZ + PT_I5], %i5
cmp %g1, NR_syscalls
bgeu 3f
mov -ENOSYS, %o0
sll %g1, 2, %l4
mov %i0, %o0
ld [%l7 + %l4], %l7
mov %i1, %o1
mov %i2, %o2
mov %i3, %o3

3
arch/sparc/kernel/hvcalls.S
View File

@ -338,8 +338,9 @@ ENTRY(sun4v_mach_set_watchdog)
mov %o1, %o4
mov HV_FAST_MACH_SET_WATCHDOG, %o5
ta HV_FAST_TRAP
brnz,a,pn %o4, 0f
stx %o1, [%o4]
retl
0: retl
nop
ENDPROC(sun4v_mach_set_watchdog)

2
arch/sparc/kernel/signal_64.c
View File

@ -52,7 +52,7 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs)
unsigned char fenab;
int err;
flush_user_windows();
synchronize_user_stack();
if (get_thread_wsaved() ||
(((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
(!__access_ok(ucp, sizeof(*ucp))))

1
arch/sparc/kernel/sparc_ksyms_64.c
View File

@ -37,6 +37,7 @@ EXPORT_SYMBOL(sun4v_niagara_getperf);
EXPORT_SYMBOL(sun4v_niagara_setperf);
EXPORT_SYMBOL(sun4v_niagara2_getperf);
EXPORT_SYMBOL(sun4v_niagara2_setperf);
EXPORT_SYMBOL(sun4v_mach_set_watchdog);
/* from hweight.S */
EXPORT_SYMBOL(__arch_hweight8);

36
arch/sparc/kernel/syscalls.S
View File

@ -158,7 +158,25 @@ linux_syscall_trace32:
add %sp, PTREGS_OFF, %o0
brnz,pn %o0, 3f
mov -ENOSYS, %o0
/* Syscall tracing can modify the registers. */
ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
sethi %hi(sys_call_table32), %l7
ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
or %l7, %lo(sys_call_table32), %l7
ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
cmp %g1, NR_syscalls
bgeu,pn %xcc, 3f
mov -ENOSYS, %o0
sll %g1, 2, %l4
srl %i0, 0, %o0
lduw [%l7 + %l4], %l7
srl %i4, 0, %o4
srl %i1, 0, %o1
srl %i2, 0, %o2
@ -170,7 +188,25 @@ linux_syscall_trace:
add %sp, PTREGS_OFF, %o0
brnz,pn %o0, 3f
mov -ENOSYS, %o0
/* Syscall tracing can modify the registers. */
ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
sethi %hi(sys_call_table64), %l7
ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
or %l7, %lo(sys_call_table64), %l7
ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
cmp %g1, NR_syscalls
bgeu,pn %xcc, 3f
mov -ENOSYS, %o0
sll %g1, 2, %l4
mov %i0, %o0
lduw [%l7 + %l4], %l7
mov %i1, %o1
mov %i2, %o2
mov %i3, %o3

2
arch/sparc/kernel/systbls_32.S
View File

@ -88,4 +88,4 @@ sys_call_table:
/*340*/ .long sys_ni_syscall, sys_kcmp, sys_finit_module, sys_sched_setattr, sys_sched_getattr
/*345*/ .long sys_renameat2, sys_seccomp, sys_getrandom, sys_memfd_create, sys_bpf
/*350*/ .long sys_execveat, sys_membarrier, sys_userfaultfd, sys_bind, sys_listen
/*355*/ .long sys_setsockopt, sys_mlock2
/*355*/ .long sys_setsockopt, sys_mlock2, sys_copy_file_range

4
arch/sparc/kernel/systbls_64.S
View File

@ -89,7 +89,7 @@ sys_call_table32:
/*340*/ .word sys_kern_features, sys_kcmp, sys_finit_module, sys_sched_setattr, sys_sched_getattr
.word sys32_renameat2, sys_seccomp, sys_getrandom, sys_memfd_create, sys_bpf
/*350*/ .word sys32_execveat, sys_membarrier, sys_userfaultfd, sys_bind, sys_listen
.word compat_sys_setsockopt, sys_mlock2
.word compat_sys_setsockopt, sys_mlock2, sys_copy_file_range
#endif /* CONFIG_COMPAT */
@ -170,4 +170,4 @@ sys_call_table:
/*340*/ .word sys_kern_features, sys_kcmp, sys_finit_module, sys_sched_setattr, sys_sched_getattr
.word sys_renameat2, sys_seccomp, sys_getrandom, sys_memfd_create, sys_bpf
/*350*/ .word sys64_execveat, sys_membarrier, sys_userfaultfd, sys_bind, sys_listen
.word sys_setsockopt, sys_mlock2
.word sys_setsockopt, sys_mlock2, sys_copy_file_range

122
drivers/misc/lkdtm.c
View File

@ -92,6 +92,9 @@ enum ctype {
CT_UNALIGNED_LOAD_STORE_WRITE,
CT_OVERWRITE_ALLOCATION,
CT_WRITE_AFTER_FREE,
CT_READ_AFTER_FREE,
CT_WRITE_BUDDY_AFTER_FREE,
CT_READ_BUDDY_AFTER_FREE,
CT_SOFTLOCKUP,
CT_HARDLOCKUP,
CT_SPINLOCKUP,
@ -104,6 +107,7 @@ enum ctype {
CT_ACCESS_USERSPACE,
CT_WRITE_RO,
CT_WRITE_KERN,
CT_WRAP_ATOMIC
};
static char* cp_name[] = {
@ -129,6 +133,9 @@ static char* cp_type[] = {
"UNALIGNED_LOAD_STORE_WRITE",
"OVERWRITE_ALLOCATION",
"WRITE_AFTER_FREE",
"READ_AFTER_FREE",
"WRITE_BUDDY_AFTER_FREE",
"READ_BUDDY_AFTER_FREE",
"SOFTLOCKUP",
"HARDLOCKUP",
"SPINLOCKUP",
@ -141,6 +148,7 @@ static char* cp_type[] = {
"ACCESS_USERSPACE",
"WRITE_RO",
"WRITE_KERN",
"WRAP_ATOMIC"
};
static struct jprobe lkdtm;
@ -409,12 +417,109 @@ static void lkdtm_do_action(enum ctype which)
break;
}
case CT_WRITE_AFTER_FREE: {
int *base, *again;
size_t len = 1024;
u32 *data = kmalloc(len, GFP_KERNEL);
/*
* The slub allocator uses the first word to store the free
* pointer in some configurations. Use the middle of the
* allocation to avoid running into the freelist
*/
size_t offset = (len / sizeof(*base)) / 2;
kfree(data);
base = kmalloc(len, GFP_KERNEL);
pr_info("Allocated memory %p-%p\n", base, &base[offset * 2]);
pr_info("Attempting bad write to freed memory at %p\n",
&base[offset]);
kfree(base);
base[offset] = 0x0abcdef0;
/* Attempt to notice the overwrite. */
again = kmalloc(len, GFP_KERNEL);
kfree(again);
if (again != base)
pr_info("Hmm, didn't get the same memory range.\n");
break;
}
case CT_READ_AFTER_FREE: {
int *base, *val, saw;
size_t len = 1024;
/*
* The slub allocator uses the first word to store the free
* pointer in some configurations. Use the middle of the
* allocation to avoid running into the freelist
*/
size_t offset = (len / sizeof(*base)) / 2;
base = kmalloc(len, GFP_KERNEL);
if (!base)
break;
val = kmalloc(len, GFP_KERNEL);
if (!val)
break;
*val = 0x12345678;
base[offset] = *val;
pr_info("Value in memory before free: %x\n", base[offset]);
kfree(base);
pr_info("Attempting bad read from freed memory\n");
saw = base[offset];
if (saw != *val) {
/* Good! Poisoning happened, so declare a win. */
pr_info("Memory correctly poisoned (%x)\n", saw);
BUG();
}
pr_info("Memory was not poisoned\n");
kfree(val);
break;
}
case CT_WRITE_BUDDY_AFTER_FREE: {
unsigned long p = __get_free_page(GFP_KERNEL);
if (!p)
break;
pr_info("Writing to the buddy page before free\n");
memset((void *)p, 0x3, PAGE_SIZE);
free_page(p);
schedule();
memset(data, 0x78, len);
pr_info("Attempting bad write to the buddy page after free\n");
memset((void *)p, 0x78, PAGE_SIZE);
/* Attempt to notice the overwrite. */
p = __get_free_page(GFP_KERNEL);
free_page(p);
schedule();
break;
}
case CT_READ_BUDDY_AFTER_FREE: {
unsigned long p = __get_free_page(GFP_KERNEL);
int saw, *val = kmalloc(1024, GFP_KERNEL);
int *base;
if (!p)
break;
if (!val)
break;
base = (int *)p;
*val = 0x12345678;
base[0] = *val;
pr_info("Value in memory before free: %x\n", base[0]);
free_page(p);
pr_info("Attempting to read from freed memory\n");
saw = base[0];
if (saw != *val) {
/* Good! Poisoning happened, so declare a win. */
pr_info("Memory correctly poisoned (%x)\n", saw);
BUG();
}
pr_info("Buddy page was not poisoned\n");
kfree(val);
break;
}
case CT_SOFTLOCKUP:
@ -528,6 +633,17 @@ static void lkdtm_do_action(enum ctype which)
do_overwritten();
break;
}
case CT_WRAP_ATOMIC: {
atomic_t under = ATOMIC_INIT(INT_MIN);
atomic_t over = ATOMIC_INIT(INT_MAX);
pr_info("attempting atomic underflow\n");
atomic_dec(&under);
pr_info("attempting atomic overflow\n");
atomic_inc(&over);
return;
}
case CT_NONE:
default:
break;

11
drivers/watchdog/Kconfig
View File

@ -1584,6 +1584,17 @@ config WATCHDOG_RIO
machines. The watchdog timeout period is normally one minute but
can be changed with a boot-time parameter.
config WATCHDOG_SUN4V
tristate "Sun4v Watchdog support"
select WATCHDOG_CORE
depends on SPARC64
help
Say Y here to support the hypervisor watchdog capability embedded
in the SPARC sun4v architecture.
To compile this driver as a module, choose M here. The module will
be called sun4v_wdt.
# XTENSA Architecture
# Xen Architecture

1
drivers/watchdog/Makefile
View File

@ -180,6 +180,7 @@ obj-$(CONFIG_SH_WDT) += shwdt.o
obj-$(CONFIG_WATCHDOG_RIO) += riowd.o
obj-$(CONFIG_WATCHDOG_CP1XXX) += cpwd.o
obj-$(CONFIG_WATCHDOG_SUN4V) += sun4v_wdt.o
# XTENSA Architecture

191
drivers/watchdog/sun4v_wdt.c Normal file
View File

@ -0,0 +1,191 @@
/*
* sun4v watchdog timer
* (c) Copyright 2016 Oracle Corporation
*
* Implement a simple watchdog driver using the built-in sun4v hypervisor
* watchdog support. If time expires, the hypervisor stops or bounces
* the guest domain.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/watchdog.h>
#include <asm/hypervisor.h>
#include <asm/mdesc.h>
#define WDT_TIMEOUT 60
#define WDT_MAX_TIMEOUT 31536000
#define WDT_MIN_TIMEOUT 1
#define WDT_DEFAULT_RESOLUTION_MS 1000 /* 1 second */
static unsigned int timeout;
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
__MODULE_STRING(WDT_TIMEOUT) ")");
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, S_IRUGO);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static int sun4v_wdt_stop(struct watchdog_device *wdd)
{
sun4v_mach_set_watchdog(0, NULL);
return 0;
}
static int sun4v_wdt_ping(struct watchdog_device *wdd)
{
int hverr;
/*
* HV watchdog timer will round up the timeout
* passed in to the nearest multiple of the
* watchdog resolution in milliseconds.
*/
hverr = sun4v_mach_set_watchdog(wdd->timeout * 1000, NULL);
if (hverr == HV_EINVAL)
return -EINVAL;
return 0;
}
static int sun4v_wdt_set_timeout(struct watchdog_device *wdd,
unsigned int timeout)
{
wdd->timeout = timeout;
return 0;
}
static const struct watchdog_info sun4v_wdt_ident = {
.options = WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE |
WDIOF_KEEPALIVEPING,
.identity = "sun4v hypervisor watchdog",
.firmware_version = 0,
};
static struct watchdog_ops sun4v_wdt_ops = {
.owner = THIS_MODULE,
.start = sun4v_wdt_ping,
.stop = sun4v_wdt_stop,
.ping = sun4v_wdt_ping,
.set_timeout = sun4v_wdt_set_timeout,
};
static struct watchdog_device wdd = {
.info = &sun4v_wdt_ident,
.ops = &sun4v_wdt_ops,
.min_timeout = WDT_MIN_TIMEOUT,
.max_timeout = WDT_MAX_TIMEOUT,
.timeout = WDT_TIMEOUT,
};
static int __init sun4v_wdt_init(void)
{
struct mdesc_handle *handle;
u64 node;
const u64 *value;
int err = 0;
unsigned long major = 1, minor = 1;
/*
* There are 2 properties that can be set from the control
* domain for the watchdog.
* watchdog-resolution
* watchdog-max-timeout
*
* We can expect a handle to be returned otherwise something
* serious is wrong. Correct to return -ENODEV here.
*/
handle = mdesc_grab();
if (!handle)
return -ENODEV;
node = mdesc_node_by_name(handle, MDESC_NODE_NULL, "platform");
err = -ENODEV;
if (node == MDESC_NODE_NULL)
goto out_release;
/*
* This is a safe way to validate if we are on the right
* platform.
*/
if (sun4v_hvapi_register(HV_GRP_CORE, major, &minor))
goto out_hv_unreg;
/* Allow value of watchdog-resolution up to 1s (default) */
value = mdesc_get_property(handle, node, "watchdog-resolution", NULL);
err = -EINVAL;
if (value) {
if (*value == 0 ||
*value > WDT_DEFAULT_RESOLUTION_MS)
goto out_hv_unreg;
}
value = mdesc_get_property(handle, node, "watchdog-max-timeout", NULL);
if (value) {
/*
* If the property value (in ms) is smaller than
* min_timeout, return -EINVAL.
*/
if (*value < wdd.min_timeout * 1000)
goto out_hv_unreg;
/*
* If the property value is smaller than
* default max_timeout then set watchdog max_timeout to
* the value of the property in seconds.
*/
if (*value < wdd.max_timeout * 1000)
wdd.max_timeout = *value / 1000;
}
watchdog_init_timeout(&wdd, timeout, NULL);
watchdog_set_nowayout(&wdd, nowayout);
err = watchdog_register_device(&wdd);
if (err)
goto out_hv_unreg;
pr_info("initialized (timeout=%ds, nowayout=%d)\n",
wdd.timeout, nowayout);
mdesc_release(handle);
return 0;
out_hv_unreg:
sun4v_hvapi_unregister(HV_GRP_CORE);
out_release:
mdesc_release(handle);
return err;
}
static void __exit sun4v_wdt_exit(void)
{
sun4v_hvapi_unregister(HV_GRP_CORE);
watchdog_unregister_device(&wdd);
}
module_init(sun4v_wdt_init);
module_exit(sun4v_wdt_exit);
MODULE_AUTHOR("Wim Coekaerts <wim.coekaerts@oracle.com>");
MODULE_DESCRIPTION("sun4v watchdog driver");
MODULE_LICENSE("GPL");