lkdtm: Provide more complete coverage for REFCOUNT tests
The existing REFCOUNT_* LKDTM tests were designed only for testing a narrow portion of CONFIG_REFCOUNT_FULL. This moves the tests to their own file and expands their testing to poke each boundary condition. Since the protections (CONFIG_REFCOUNT_FULL and x86-fast) use different saturation values and reach-zero behavior, those have to be build-time set so the tests can actually validate things are happening at the right places. Notably, the x86-fast protection will fail REFCOUNT_INC_ZERO and REFCOUNT_ADD_ZERO since those conditions are not checked (only overflow is critical to protecting refcount_t). CONFIG_REFCOUNT_FULL will warn for each REFCOUNT_*_NEGATIVE test since it provides zero-pinning behaviors (which allows it to pass REFCOUNT_INC_ZERO and REFCOUNT_ADD_ZERO). Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook
parent
520eccdfe1
commit
95925c99b9
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@ -60,6 +60,7 @@ lkdtm-$(CONFIG_LKDTM) += lkdtm_core.o
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lkdtm-$(CONFIG_LKDTM) += lkdtm_bugs.o
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lkdtm-$(CONFIG_LKDTM) += lkdtm_heap.o
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lkdtm-$(CONFIG_LKDTM) += lkdtm_perms.o
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lkdtm-$(CONFIG_LKDTM) += lkdtm_refcount.o
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lkdtm-$(CONFIG_LKDTM) += lkdtm_rodata_objcopy.o
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lkdtm-$(CONFIG_LKDTM) += lkdtm_usercopy.o
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@ -19,12 +19,6 @@ void lkdtm_SOFTLOCKUP(void);
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void lkdtm_HARDLOCKUP(void);
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void lkdtm_SPINLOCKUP(void);
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void lkdtm_HUNG_TASK(void);
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void lkdtm_REFCOUNT_SATURATE_INC(void);
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void lkdtm_REFCOUNT_SATURATE_ADD(void);
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void lkdtm_REFCOUNT_ZERO_DEC(void);
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void lkdtm_REFCOUNT_ZERO_INC(void);
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void lkdtm_REFCOUNT_ZERO_SUB(void);
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void lkdtm_REFCOUNT_ZERO_ADD(void);
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void lkdtm_CORRUPT_LIST_ADD(void);
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void lkdtm_CORRUPT_LIST_DEL(void);
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void lkdtm_CORRUPT_USER_DS(void);
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@ -49,6 +43,25 @@ void lkdtm_EXEC_RODATA(void);
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void lkdtm_EXEC_USERSPACE(void);
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void lkdtm_ACCESS_USERSPACE(void);
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/* lkdtm_refcount.c */
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void lkdtm_REFCOUNT_INC_OVERFLOW(void);
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void lkdtm_REFCOUNT_ADD_OVERFLOW(void);
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void lkdtm_REFCOUNT_INC_NOT_ZERO_OVERFLOW(void);
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void lkdtm_REFCOUNT_ADD_NOT_ZERO_OVERFLOW(void);
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void lkdtm_REFCOUNT_DEC_ZERO(void);
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void lkdtm_REFCOUNT_DEC_NEGATIVE(void);
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void lkdtm_REFCOUNT_DEC_AND_TEST_NEGATIVE(void);
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void lkdtm_REFCOUNT_SUB_AND_TEST_NEGATIVE(void);
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void lkdtm_REFCOUNT_INC_ZERO(void);
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void lkdtm_REFCOUNT_ADD_ZERO(void);
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void lkdtm_REFCOUNT_INC_SATURATED(void);
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void lkdtm_REFCOUNT_DEC_SATURATED(void);
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void lkdtm_REFCOUNT_ADD_SATURATED(void);
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void lkdtm_REFCOUNT_INC_NOT_ZERO_SATURATED(void);
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void lkdtm_REFCOUNT_ADD_NOT_ZERO_SATURATED(void);
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void lkdtm_REFCOUNT_DEC_AND_TEST_SATURATED(void);
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void lkdtm_REFCOUNT_SUB_AND_TEST_SATURATED(void);
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/* lkdtm_rodata.c */
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void lkdtm_rodata_do_nothing(void);
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@ -6,7 +6,6 @@
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*/
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#include "lkdtm.h"
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#include <linux/list.h>
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#include <linux/refcount.h>
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/uaccess.h>
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@ -137,88 +136,6 @@ void lkdtm_HUNG_TASK(void)
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schedule();
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}
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void lkdtm_REFCOUNT_SATURATE_INC(void)
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{
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refcount_t over = REFCOUNT_INIT(UINT_MAX - 1);
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pr_info("attempting good refcount decrement\n");
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refcount_dec(&over);
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refcount_inc(&over);
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pr_info("attempting bad refcount inc overflow\n");
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refcount_inc(&over);
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refcount_inc(&over);
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if (refcount_read(&over) == UINT_MAX)
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pr_err("Correctly stayed saturated, but no BUG?!\n");
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else
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pr_err("Fail: refcount wrapped\n");
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}
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void lkdtm_REFCOUNT_SATURATE_ADD(void)
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{
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refcount_t over = REFCOUNT_INIT(UINT_MAX - 1);
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pr_info("attempting good refcount decrement\n");
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refcount_dec(&over);
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refcount_inc(&over);
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pr_info("attempting bad refcount add overflow\n");
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refcount_add(2, &over);
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if (refcount_read(&over) == UINT_MAX)
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pr_err("Correctly stayed saturated, but no BUG?!\n");
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else
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pr_err("Fail: refcount wrapped\n");
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}
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void lkdtm_REFCOUNT_ZERO_DEC(void)
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{
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refcount_t zero = REFCOUNT_INIT(1);
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pr_info("attempting bad refcount decrement to zero\n");
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refcount_dec(&zero);
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if (refcount_read(&zero) == 0)
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pr_err("Stayed at zero, but no BUG?!\n");
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else
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pr_err("Fail: refcount went crazy\n");
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}
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void lkdtm_REFCOUNT_ZERO_SUB(void)
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{
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refcount_t zero = REFCOUNT_INIT(1);
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pr_info("attempting bad refcount subtract past zero\n");
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if (!refcount_sub_and_test(2, &zero))
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pr_info("wrap attempt was noticed\n");
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if (refcount_read(&zero) == 1)
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pr_err("Correctly stayed above 0, but no BUG?!\n");
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else
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pr_err("Fail: refcount wrapped\n");
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}
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void lkdtm_REFCOUNT_ZERO_INC(void)
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{
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refcount_t zero = REFCOUNT_INIT(0);
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pr_info("attempting bad refcount increment from zero\n");
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refcount_inc(&zero);
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if (refcount_read(&zero) == 0)
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pr_err("Stayed at zero, but no BUG?!\n");
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else
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pr_err("Fail: refcount went past zero\n");
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}
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void lkdtm_REFCOUNT_ZERO_ADD(void)
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{
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refcount_t zero = REFCOUNT_INIT(0);
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pr_info("attempting bad refcount addition from zero\n");
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refcount_add(2, &zero);
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if (refcount_read(&zero) == 0)
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pr_err("Stayed at zero, but no BUG?!\n");
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else
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pr_err("Fail: refcount went past zero\n");
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}
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void lkdtm_CORRUPT_LIST_ADD(void)
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{
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/*
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@ -221,12 +221,23 @@ struct crashtype crashtypes[] = {
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CRASHTYPE(WRITE_RO),
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CRASHTYPE(WRITE_RO_AFTER_INIT),
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CRASHTYPE(WRITE_KERN),
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CRASHTYPE(REFCOUNT_SATURATE_INC),
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CRASHTYPE(REFCOUNT_SATURATE_ADD),
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CRASHTYPE(REFCOUNT_ZERO_DEC),
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CRASHTYPE(REFCOUNT_ZERO_INC),
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CRASHTYPE(REFCOUNT_ZERO_SUB),
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CRASHTYPE(REFCOUNT_ZERO_ADD),
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CRASHTYPE(REFCOUNT_INC_OVERFLOW),
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CRASHTYPE(REFCOUNT_ADD_OVERFLOW),
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CRASHTYPE(REFCOUNT_INC_NOT_ZERO_OVERFLOW),
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CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_OVERFLOW),
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CRASHTYPE(REFCOUNT_DEC_ZERO),
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CRASHTYPE(REFCOUNT_DEC_NEGATIVE),
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CRASHTYPE(REFCOUNT_DEC_AND_TEST_NEGATIVE),
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CRASHTYPE(REFCOUNT_SUB_AND_TEST_NEGATIVE),
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CRASHTYPE(REFCOUNT_INC_ZERO),
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CRASHTYPE(REFCOUNT_ADD_ZERO),
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CRASHTYPE(REFCOUNT_INC_SATURATED),
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CRASHTYPE(REFCOUNT_DEC_SATURATED),
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CRASHTYPE(REFCOUNT_ADD_SATURATED),
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CRASHTYPE(REFCOUNT_INC_NOT_ZERO_SATURATED),
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CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED),
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CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED),
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CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED),
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CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
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CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
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CRASHTYPE(USERCOPY_HEAP_FLAG_TO),
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@ -0,0 +1,356 @@
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/*
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* This is for all the tests related to refcount bugs (e.g. overflow,
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* underflow, reaching zero untested, etc).
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*/
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#include "lkdtm.h"
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#include <linux/refcount.h>
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#ifdef CONFIG_REFCOUNT_FULL
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#define REFCOUNT_MAX (UINT_MAX - 1)
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#define REFCOUNT_SATURATED UINT_MAX
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#else
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#define REFCOUNT_MAX INT_MAX
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#define REFCOUNT_SATURATED (INT_MIN / 2)
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#endif
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static void overflow_check(refcount_t *ref)
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{
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switch (refcount_read(ref)) {
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case REFCOUNT_SATURATED:
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pr_info("Overflow detected: saturated\n");
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break;
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case REFCOUNT_MAX:
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pr_warn("Overflow detected: unsafely reset to max\n");
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break;
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default:
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pr_err("Fail: refcount wrapped to %d\n", refcount_read(ref));
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}
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}
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/*
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* A refcount_inc() above the maximum value of the refcount implementation,
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* should at least saturate, and at most also WARN.
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*/
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void lkdtm_REFCOUNT_INC_OVERFLOW(void)
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{
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refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX - 1);
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pr_info("attempting good refcount_inc() without overflow\n");
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refcount_dec(&over);
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refcount_inc(&over);
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pr_info("attempting bad refcount_inc() overflow\n");
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refcount_inc(&over);
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refcount_inc(&over);
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overflow_check(&over);
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}
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/* refcount_add() should behave just like refcount_inc() above. */
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void lkdtm_REFCOUNT_ADD_OVERFLOW(void)
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{
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refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX - 1);
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pr_info("attempting good refcount_add() without overflow\n");
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refcount_dec(&over);
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refcount_dec(&over);
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refcount_dec(&over);
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refcount_dec(&over);
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refcount_add(4, &over);
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pr_info("attempting bad refcount_add() overflow\n");
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refcount_add(4, &over);
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overflow_check(&over);
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}
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/* refcount_inc_not_zero() should behave just like refcount_inc() above. */
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void lkdtm_REFCOUNT_INC_NOT_ZERO_OVERFLOW(void)
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{
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refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX);
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pr_info("attempting bad refcount_inc_not_zero() overflow\n");
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if (!refcount_inc_not_zero(&over))
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pr_warn("Weird: refcount_inc_not_zero() reported zero\n");
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overflow_check(&over);
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}
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/* refcount_add_not_zero() should behave just like refcount_inc() above. */
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void lkdtm_REFCOUNT_ADD_NOT_ZERO_OVERFLOW(void)
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{
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refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX);
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pr_info("attempting bad refcount_add_not_zero() overflow\n");
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if (!refcount_add_not_zero(6, &over))
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pr_warn("Weird: refcount_add_not_zero() reported zero\n");
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overflow_check(&over);
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}
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static void check_zero(refcount_t *ref)
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{
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switch (refcount_read(ref)) {
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case REFCOUNT_SATURATED:
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pr_info("Zero detected: saturated\n");
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break;
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case REFCOUNT_MAX:
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pr_warn("Zero detected: unsafely reset to max\n");
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break;
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case 0:
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pr_warn("Still at zero: refcount_inc/add() must not inc-from-0\n");
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break;
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default:
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pr_err("Fail: refcount went crazy: %d\n", refcount_read(ref));
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}
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}
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/*
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* A refcount_dec(), as opposed to a refcount_dec_and_test(), when it hits
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* zero it should either saturate (when inc-from-zero isn't protected)
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* or stay at zero (when inc-from-zero is protected) and should WARN for both.
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*/
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void lkdtm_REFCOUNT_DEC_ZERO(void)
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{
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refcount_t zero = REFCOUNT_INIT(2);
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pr_info("attempting good refcount_dec()\n");
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refcount_dec(&zero);
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pr_info("attempting bad refcount_dec() to zero\n");
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refcount_dec(&zero);
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check_zero(&zero);
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}
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static void check_negative(refcount_t *ref, int start)
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{
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/*
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* CONFIG_REFCOUNT_FULL refuses to move a refcount at all on an
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* over-sub, so we have to track our starting position instead of
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* looking only at zero-pinning.
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*/
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if (refcount_read(ref) == start) {
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pr_warn("Still at %d: refcount_inc/add() must not inc-from-0\n",
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start);
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return;
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}
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switch (refcount_read(ref)) {
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case REFCOUNT_SATURATED:
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pr_info("Negative detected: saturated\n");
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break;
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case REFCOUNT_MAX:
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pr_warn("Negative detected: unsafely reset to max\n");
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break;
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default:
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pr_err("Fail: refcount went crazy: %d\n", refcount_read(ref));
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}
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}
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/* A refcount_dec() going negative should saturate and may WARN. */
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void lkdtm_REFCOUNT_DEC_NEGATIVE(void)
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{
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refcount_t neg = REFCOUNT_INIT(0);
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pr_info("attempting bad refcount_dec() below zero\n");
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refcount_dec(&neg);
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check_negative(&neg, 0);
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}
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/*
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* A refcount_dec_and_test() should act like refcount_dec() above when
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* going negative.
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*/
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void lkdtm_REFCOUNT_DEC_AND_TEST_NEGATIVE(void)
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{
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refcount_t neg = REFCOUNT_INIT(0);
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pr_info("attempting bad refcount_dec_and_test() below zero\n");
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if (refcount_dec_and_test(&neg))
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pr_warn("Weird: refcount_dec_and_test() reported zero\n");
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check_negative(&neg, 0);
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}
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/*
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* A refcount_sub_and_test() should act like refcount_dec_and_test()
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* above when going negative.
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*/
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void lkdtm_REFCOUNT_SUB_AND_TEST_NEGATIVE(void)
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{
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refcount_t neg = REFCOUNT_INIT(3);
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pr_info("attempting bad refcount_sub_and_test() below zero\n");
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if (refcount_sub_and_test(5, &neg))
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pr_warn("Weird: refcount_sub_and_test() reported zero\n");
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check_negative(&neg, 3);
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}
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static void check_from_zero(refcount_t *ref)
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{
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switch (refcount_read(ref)) {
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case 0:
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pr_info("Zero detected: stayed at zero\n");
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break;
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case REFCOUNT_SATURATED:
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pr_info("Zero detected: saturated\n");
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break;
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case REFCOUNT_MAX:
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pr_warn("Zero detected: unsafely reset to max\n");
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break;
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default:
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pr_info("Fail: zero not detected, incremeted to %d\n",
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refcount_read(ref));
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}
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}
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/*
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* A refcount_inc() from zero should pin to zero or saturate and may WARN.
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* Only CONFIG_REFCOUNT_FULL provides this protection currently.
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*/
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void lkdtm_REFCOUNT_INC_ZERO(void)
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{
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refcount_t zero = REFCOUNT_INIT(0);
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pr_info("attempting safe refcount_inc_not_zero() from zero\n");
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if (!refcount_inc_not_zero(&zero)) {
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pr_info("Good: zero detected\n");
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if (refcount_read(&zero) == 0)
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pr_info("Correctly stayed at zero\n");
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else
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pr_err("Fail: refcount went past zero!\n");
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} else {
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pr_err("Fail: Zero not detected!?\n");
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}
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pr_info("attempting bad refcount_inc() from zero\n");
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refcount_inc(&zero);
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check_from_zero(&zero);
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}
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/*
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* A refcount_add() should act like refcount_inc() above when starting
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* at zero.
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*/
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void lkdtm_REFCOUNT_ADD_ZERO(void)
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{
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refcount_t zero = REFCOUNT_INIT(0);
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pr_info("attempting safe refcount_add_not_zero() from zero\n");
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if (!refcount_add_not_zero(3, &zero)) {
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pr_info("Good: zero detected\n");
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if (refcount_read(&zero) == 0)
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pr_info("Correctly stayed at zero\n");
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else
|
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pr_err("Fail: refcount went past zero\n");
|
||||
} else {
|
||||
pr_err("Fail: Zero not detected!?\n");
|
||||
}
|
||||
|
||||
pr_info("attempting bad refcount_add() from zero\n");
|
||||
refcount_add(3, &zero);
|
||||
|
||||
check_from_zero(&zero);
|
||||
}
|
||||
|
||||
static void check_saturated(refcount_t *ref)
|
||||
{
|
||||
switch (refcount_read(ref)) {
|
||||
case REFCOUNT_SATURATED:
|
||||
pr_info("Saturation detected: still saturated\n");
|
||||
break;
|
||||
case REFCOUNT_MAX:
|
||||
pr_warn("Saturation detected: unsafely reset to max\n");
|
||||
break;
|
||||
default:
|
||||
pr_err("Fail: refcount went crazy: %d\n", refcount_read(ref));
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* A refcount_inc() from a saturated value should at most warn about
|
||||
* being saturated already.
|
||||
*/
|
||||
void lkdtm_REFCOUNT_INC_SATURATED(void)
|
||||
{
|
||||
refcount_t sat = REFCOUNT_INIT(REFCOUNT_SATURATED);
|
||||
|
||||
pr_info("attempting bad refcount_inc() from saturated\n");
|
||||
refcount_inc(&sat);
|
||||
|
||||
check_saturated(&sat);
|
||||
}
|
||||
|
||||
/* Should act like refcount_inc() above from saturated. */
|
||||
void lkdtm_REFCOUNT_DEC_SATURATED(void)
|
||||
{
|
||||
refcount_t sat = REFCOUNT_INIT(REFCOUNT_SATURATED);
|
||||
|
||||
pr_info("attempting bad refcount_dec() from saturated\n");
|
||||
refcount_dec(&sat);
|
||||
|
||||
check_saturated(&sat);
|
||||
}
|
||||
|
||||
/* Should act like refcount_inc() above from saturated. */
|
||||
void lkdtm_REFCOUNT_ADD_SATURATED(void)
|
||||
{
|
||||
refcount_t sat = REFCOUNT_INIT(REFCOUNT_SATURATED);
|
||||
|
||||
pr_info("attempting bad refcount_dec() from saturated\n");
|
||||
refcount_add(8, &sat);
|
||||
|
||||
check_saturated(&sat);
|
||||
}
|
||||
|
||||
/* Should act like refcount_inc() above from saturated. */
|
||||
void lkdtm_REFCOUNT_INC_NOT_ZERO_SATURATED(void)
|
||||
{
|
||||
refcount_t sat = REFCOUNT_INIT(REFCOUNT_SATURATED);
|
||||
|
||||
pr_info("attempting bad refcount_inc_not_zero() from saturated\n");
|
||||
if (!refcount_inc_not_zero(&sat))
|
||||
pr_warn("Weird: refcount_inc_not_zero() reported zero\n");
|
||||
|
||||
check_saturated(&sat);
|
||||
}
|
||||
|
||||
/* Should act like refcount_inc() above from saturated. */
|
||||
void lkdtm_REFCOUNT_ADD_NOT_ZERO_SATURATED(void)
|
||||
{
|
||||
refcount_t sat = REFCOUNT_INIT(REFCOUNT_SATURATED);
|
||||
|
||||
pr_info("attempting bad refcount_add_not_zero() from saturated\n");
|
||||
if (!refcount_add_not_zero(7, &sat))
|
||||
pr_warn("Weird: refcount_add_not_zero() reported zero\n");
|
||||
|
||||
check_saturated(&sat);
|
||||
}
|
||||
|
||||
/* Should act like refcount_inc() above from saturated. */
|
||||
void lkdtm_REFCOUNT_DEC_AND_TEST_SATURATED(void)
|
||||
{
|
||||
refcount_t sat = REFCOUNT_INIT(REFCOUNT_SATURATED);
|
||||
|
||||
pr_info("attempting bad refcount_dec_and_test() from saturated\n");
|
||||
if (refcount_dec_and_test(&sat))
|
||||
pr_warn("Weird: refcount_dec_and_test() reported zero\n");
|
||||
|
||||
check_saturated(&sat);
|
||||
}
|
||||
|
||||
/* Should act like refcount_inc() above from saturated. */
|
||||
void lkdtm_REFCOUNT_SUB_AND_TEST_SATURATED(void)
|
||||
{
|
||||
refcount_t sat = REFCOUNT_INIT(REFCOUNT_SATURATED);
|
||||
|
||||
pr_info("attempting bad refcount_sub_and_test() from saturated\n");
|
||||
if (refcount_sub_and_test(8, &sat))
|
||||
pr_warn("Weird: refcount_sub_and_test() reported zero\n");
|
||||
|
||||
check_saturated(&sat);
|
||||
}
|
||||
Loading…
Reference in New Issue