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lkdtm: Convert to refcount_t testing

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Since we'll be using refcount_t instead of atomic_t for refcounting,
change the LKDTM tests to reflect the new interface and test conditions.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Hans Liljestrand <ishkamiel@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: arnd@arndb.de
Cc: dhowells@redhat.com
Cc: dwindsor@gmail.com
Cc: elena.reshetova@intel.com
Cc: gregkh@linuxfoundation.org
Cc: h.peter.anvin@intel.com
Cc: kernel-hardening@lists.openwall.com
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1486164412-7338-3-git-send-email-keescook@chromium.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kees Cook 2017-02-03 15:26:50 -08:00 committed by Ingo Molnar
parent 10383aea2f
commit ff86b30010
3 changed files with 85 additions and 18 deletions
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8
drivers/misc/lkdtm.h
View file

@ -19,8 +19,12 @@ void lkdtm_SOFTLOCKUP(void);
void lkdtm_HARDLOCKUP(void);
void lkdtm_SPINLOCKUP(void);
void lkdtm_HUNG_TASK(void);
void lkdtm_ATOMIC_UNDERFLOW(void);
void lkdtm_ATOMIC_OVERFLOW(void);
void lkdtm_REFCOUNT_SATURATE_INC(void);
void lkdtm_REFCOUNT_SATURATE_ADD(void);
void lkdtm_REFCOUNT_ZERO_DEC(void);
void lkdtm_REFCOUNT_ZERO_INC(void);
void lkdtm_REFCOUNT_ZERO_SUB(void);
void lkdtm_REFCOUNT_ZERO_ADD(void);
void lkdtm_CORRUPT_LIST_ADD(void);
void lkdtm_CORRUPT_LIST_DEL(void);

87
drivers/misc/lkdtm_bugs.c
View file

@ -6,6 +6,7 @@
*/
#include "lkdtm.h"
#include <linux/list.h>
#include <linux/refcount.h>
#include <linux/sched.h>
struct lkdtm_list {
@ -129,28 +130,86 @@ void lkdtm_HUNG_TASK(void)
schedule();
}
void lkdtm_ATOMIC_UNDERFLOW(void)
void lkdtm_REFCOUNT_SATURATE_INC(void)
{
atomic_t under = ATOMIC_INIT(INT_MIN);
refcount_t over = REFCOUNT_INIT(UINT_MAX - 1);
pr_info("attempting good atomic increment\n");
atomic_inc(&under);
atomic_dec(&under);
pr_info("attempting good refcount decrement\n");
refcount_dec(&over);
refcount_inc(&over);
pr_info("attempting bad atomic underflow\n");
atomic_dec(&under);
pr_info("attempting bad refcount inc overflow\n");
refcount_inc(&over);
refcount_inc(&over);
if (refcount_read(&over) == UINT_MAX)
pr_err("Correctly stayed saturated, but no BUG?!\n");
else
pr_err("Fail: refcount wrapped\n");
}
void lkdtm_ATOMIC_OVERFLOW(void)
void lkdtm_REFCOUNT_SATURATE_ADD(void)
{
atomic_t over = ATOMIC_INIT(INT_MAX);
refcount_t over = REFCOUNT_INIT(UINT_MAX - 1);
pr_info("attempting good atomic decrement\n");
atomic_dec(&over);
atomic_inc(&over);
pr_info("attempting good refcount decrement\n");
refcount_dec(&over);
refcount_inc(&over);
pr_info("attempting bad atomic overflow\n");
atomic_inc(&over);
pr_info("attempting bad refcount add overflow\n");
refcount_add(2, &over);
if (refcount_read(&over) == UINT_MAX)
pr_err("Correctly stayed saturated, but no BUG?!\n");
else
pr_err("Fail: refcount wrapped\n");
}
void lkdtm_REFCOUNT_ZERO_DEC(void)
{
refcount_t zero = REFCOUNT_INIT(1);
pr_info("attempting bad refcount decrement to zero\n");
refcount_dec(&zero);
if (refcount_read(&zero) == 0)
pr_err("Stayed at zero, but no BUG?!\n");
else
pr_err("Fail: refcount went crazy\n");
}
void lkdtm_REFCOUNT_ZERO_SUB(void)
{
refcount_t zero = REFCOUNT_INIT(1);
pr_info("attempting bad refcount subtract past zero\n");
if (!refcount_sub_and_test(2, &zero))
pr_info("wrap attempt was noticed\n");
if (refcount_read(&zero) == 1)
pr_err("Correctly stayed above 0, but no BUG?!\n");
else
pr_err("Fail: refcount wrapped\n");
}
void lkdtm_REFCOUNT_ZERO_INC(void)
{
refcount_t zero = REFCOUNT_INIT(0);
pr_info("attempting bad refcount increment from zero\n");
refcount_inc(&zero);
if (refcount_read(&zero) == 0)
pr_err("Stayed at zero, but no BUG?!\n");
else
pr_err("Fail: refcount went past zero\n");
}
void lkdtm_REFCOUNT_ZERO_ADD(void)
{
refcount_t zero = REFCOUNT_INIT(0);
pr_info("attempting bad refcount addition from zero\n");
refcount_add(2, &zero);
if (refcount_read(&zero) == 0)
pr_err("Stayed at zero, but no BUG?!\n");
else
pr_err("Fail: refcount went past zero\n");
}
void lkdtm_CORRUPT_LIST_ADD(void)

8
drivers/misc/lkdtm_core.c
View file

@ -220,8 +220,12 @@ struct crashtype crashtypes[] = {
CRASHTYPE(WRITE_RO),
CRASHTYPE(WRITE_RO_AFTER_INIT),
CRASHTYPE(WRITE_KERN),
CRASHTYPE(ATOMIC_UNDERFLOW),
CRASHTYPE(ATOMIC_OVERFLOW),
CRASHTYPE(REFCOUNT_SATURATE_INC),
CRASHTYPE(REFCOUNT_SATURATE_ADD),
CRASHTYPE(REFCOUNT_ZERO_DEC),
CRASHTYPE(REFCOUNT_ZERO_INC),
CRASHTYPE(REFCOUNT_ZERO_SUB),
CRASHTYPE(REFCOUNT_ZERO_ADD),
CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
CRASHTYPE(USERCOPY_HEAP_FLAG_TO),