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Merge patch series "riscv: Improve KASAN coverage to fix unit tests"

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Samuel Holland <samuel.holland@sifive.com> says:

This series fixes two areas where uninstrumented assembly routines
caused gaps in KASAN coverage on RISC-V, which were caught by KUnit
tests. The KASAN KUnit test suite passes after applying this series.

This series fixes the following test failures:
  # kasan_strings: EXPECTATION FAILED at mm/kasan/kasan_test.c:1520
  KASAN failure expected in "kasan_int_result = strcmp(ptr, "2")", but none occurred
  # kasan_strings: EXPECTATION FAILED at mm/kasan/kasan_test.c:1524
  KASAN failure expected in "kasan_int_result = strlen(ptr)", but none occurred
  not ok 60 kasan_strings
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1531
  KASAN failure expected in "set_bit(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1533
  KASAN failure expected in "clear_bit(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1535
  KASAN failure expected in "clear_bit_unlock(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1536
  KASAN failure expected in "__clear_bit_unlock(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1537
  KASAN failure expected in "change_bit(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1543
  KASAN failure expected in "test_and_set_bit(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1545
  KASAN failure expected in "test_and_set_bit_lock(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1546
  KASAN failure expected in "test_and_clear_bit(nr, addr)", but none occurred
  # kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan_test.c:1548
  KASAN failure expected in "test_and_change_bit(nr, addr)", but none occurred
  not ok 61 kasan_bitops_generic

Samuel Holland (2):
  riscv: Omit optimized string routines when using KASAN
  riscv: Enable bitops instrumentation

arch/riscv/include/asm/bitops.h | 43 ++++++++++++++++++---------------
 arch/riscv/include/asm/string.h |  2 ++
 arch/riscv/kernel/riscv_ksyms.c |  3 ---
 arch/riscv/lib/Makefile         |  2 ++
 arch/riscv/lib/strcmp.S         |  1 +
 arch/riscv/lib/strlen.S         |  1 +
 arch/riscv/lib/strncmp.S        |  1 +
 arch/riscv/purgatory/Makefile   |  2 ++
 8 files changed, 32 insertions(+), 23 deletions(-)

* b4-shazam-merge:
  riscv: Enable bitops instrumentation
  riscv: Omit optimized string routines when using KASAN

Link: https://lore.kernel.org/r/20240801033725.28816-1-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt 2024-09-19 01:10:44 -07:00
commit 5835437609
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
8 changed files with 32 additions and 23 deletions
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43
arch/riscv/include/asm/bitops.h
View File

@ -222,44 +222,44 @@ static __always_inline int variable_fls(unsigned int x)
#define __NOT(x) (~(x))
/**
* test_and_set_bit - Set a bit and return its old value
* arch_test_and_set_bit - Set a bit and return its old value
* @nr: Bit to set
* @addr: Address to count from
*
* This operation may be reordered on other architectures than x86.
*/
static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
static inline int arch_test_and_set_bit(int nr, volatile unsigned long *addr)
{
return __test_and_op_bit(or, __NOP, nr, addr);
}
/**
* test_and_clear_bit - Clear a bit and return its old value
* arch_test_and_clear_bit - Clear a bit and return its old value
* @nr: Bit to clear
* @addr: Address to count from
*
* This operation can be reordered on other architectures other than x86.
*/
static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
static inline int arch_test_and_clear_bit(int nr, volatile unsigned long *addr)
{
return __test_and_op_bit(and, __NOT, nr, addr);
}
/**
* test_and_change_bit - Change a bit and return its old value
* arch_test_and_change_bit - Change a bit and return its old value
* @nr: Bit to change
* @addr: Address to count from
*
* This operation is atomic and cannot be reordered.
* It also implies a memory barrier.
*/
static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
static inline int arch_test_and_change_bit(int nr, volatile unsigned long *addr)
{
return __test_and_op_bit(xor, __NOP, nr, addr);
}
/**
* set_bit - Atomically set a bit in memory
* arch_set_bit - Atomically set a bit in memory
* @nr: the bit to set
* @addr: the address to start counting from
*
@ -270,13 +270,13 @@ static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
* Note that @nr may be almost arbitrarily large; this function is not
* restricted to acting on a single-word quantity.
*/
static inline void set_bit(int nr, volatile unsigned long *addr)
static inline void arch_set_bit(int nr, volatile unsigned long *addr)
{
__op_bit(or, __NOP, nr, addr);
}
/**
* clear_bit - Clears a bit in memory
* arch_clear_bit - Clears a bit in memory
* @nr: Bit to clear
* @addr: Address to start counting from
*
@ -284,13 +284,13 @@ static inline void set_bit(int nr, volatile unsigned long *addr)
* on non x86 architectures, so if you are writing portable code,
* make sure not to rely on its reordering guarantees.
*/
static inline void clear_bit(int nr, volatile unsigned long *addr)
static inline void arch_clear_bit(int nr, volatile unsigned long *addr)
{
__op_bit(and, __NOT, nr, addr);
}
/**
* change_bit - Toggle a bit in memory
* arch_change_bit - Toggle a bit in memory
* @nr: Bit to change
* @addr: Address to start counting from
*
@ -298,40 +298,40 @@ static inline void clear_bit(int nr, volatile unsigned long *addr)
* Note that @nr may be almost arbitrarily large; this function is not
* restricted to acting on a single-word quantity.
*/
static inline void change_bit(int nr, volatile unsigned long *addr)
static inline void arch_change_bit(int nr, volatile unsigned long *addr)
{
__op_bit(xor, __NOP, nr, addr);
}
/**
* test_and_set_bit_lock - Set a bit and return its old value, for lock
* arch_test_and_set_bit_lock - Set a bit and return its old value, for lock
* @nr: Bit to set
* @addr: Address to count from
*
* This operation is atomic and provides acquire barrier semantics.
* It can be used to implement bit locks.
*/
static inline int test_and_set_bit_lock(
static inline int arch_test_and_set_bit_lock(
unsigned long nr, volatile unsigned long *addr)
{
return __test_and_op_bit_ord(or, __NOP, nr, addr, .aq);
}
/**
* clear_bit_unlock - Clear a bit in memory, for unlock
* arch_clear_bit_unlock - Clear a bit in memory, for unlock
* @nr: the bit to set
* @addr: the address to start counting from
*
* This operation is atomic and provides release barrier semantics.
*/
static inline void clear_bit_unlock(
static inline void arch_clear_bit_unlock(
unsigned long nr, volatile unsigned long *addr)
{
__op_bit_ord(and, __NOT, nr, addr, .rl);
}
/**
* __clear_bit_unlock - Clear a bit in memory, for unlock
* arch___clear_bit_unlock - Clear a bit in memory, for unlock
* @nr: the bit to set
* @addr: the address to start counting from
*
@ -345,13 +345,13 @@ static inline void clear_bit_unlock(
* non-atomic property here: it's a lot more instructions and we still have to
* provide release semantics anyway.
*/
static inline void __clear_bit_unlock(
static inline void arch___clear_bit_unlock(
unsigned long nr, volatile unsigned long *addr)
{
clear_bit_unlock(nr, addr);
arch_clear_bit_unlock(nr, addr);
}
static inline bool xor_unlock_is_negative_byte(unsigned long mask,
static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask,
volatile unsigned long *addr)
{
unsigned long res;
@ -369,6 +369,9 @@ static inline bool xor_unlock_is_negative_byte(unsigned long mask,
#undef __NOT
#undef __AMO
#include <asm-generic/bitops/instrumented-atomic.h>
#include <asm-generic/bitops/instrumented-lock.h>
#include <asm-generic/bitops/non-atomic.h>
#include <asm-generic/bitops/le.h>
#include <asm-generic/bitops/ext2-atomic.h>

2
arch/riscv/include/asm/string.h
View File

@ -19,6 +19,7 @@ extern asmlinkage void *__memcpy(void *, const void *, size_t);
extern asmlinkage void *memmove(void *, const void *, size_t);
extern asmlinkage void *__memmove(void *, const void *, size_t);
#if !(defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
#define __HAVE_ARCH_STRCMP
extern asmlinkage int strcmp(const char *cs, const char *ct);
@ -27,6 +28,7 @@ extern asmlinkage __kernel_size_t strlen(const char *);
#define __HAVE_ARCH_STRNCMP
extern asmlinkage int strncmp(const char *cs, const char *ct, size_t count);
#endif
/* For those files which don't want to check by kasan. */
#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)

3
arch/riscv/kernel/riscv_ksyms.c
View File

@ -12,9 +12,6 @@
EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(strcmp);
EXPORT_SYMBOL(strlen);
EXPORT_SYMBOL(strncmp);
EXPORT_SYMBOL(__memset);
EXPORT_SYMBOL(__memcpy);
EXPORT_SYMBOL(__memmove);

2
arch/riscv/lib/Makefile
View File

@ -3,9 +3,11 @@ lib-y += delay.o
lib-y += memcpy.o
lib-y += memset.o
lib-y += memmove.o
ifeq ($(CONFIG_KASAN_GENERIC)$(CONFIG_KASAN_SW_TAGS),)
lib-y += strcmp.o
lib-y += strlen.o
lib-y += strncmp.o
endif
lib-y += csum.o
ifeq ($(CONFIG_MMU), y)
lib-$(CONFIG_RISCV_ISA_V) += uaccess_vector.o

1
arch/riscv/lib/strcmp.S
View File

@ -121,3 +121,4 @@ strcmp_zbb:
#endif
SYM_FUNC_END(strcmp)
SYM_FUNC_ALIAS(__pi_strcmp, strcmp)
EXPORT_SYMBOL(strcmp)

1
arch/riscv/lib/strlen.S
View File

@ -131,3 +131,4 @@ strlen_zbb:
#endif
SYM_FUNC_END(strlen)
SYM_FUNC_ALIAS(__pi_strlen, strlen)
EXPORT_SYMBOL(strlen)

1
arch/riscv/lib/strncmp.S
View File

@ -137,3 +137,4 @@ strncmp_zbb:
#endif
SYM_FUNC_END(strncmp)
SYM_FUNC_ALIAS(__pi_strncmp, strncmp)
EXPORT_SYMBOL(strncmp)

2
arch/riscv/purgatory/Makefile
View File

@ -1,7 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o
ifeq ($(CONFIG_KASAN_GENERIC)$(CONFIG_KASAN_SW_TAGS),)
purgatory-y += strcmp.o strlen.o strncmp.o
endif
targets += $(purgatory-y)
PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))