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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-26 22:19:04 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-26 22:19:04 +0300
commit4be240b18aa67b1144af546bea2d7cad1b75c19b (patch)
treef95b3ca5c3f5de5b634da578b55f85d2ae89c5de
parent3f7282139fe1594be464b90141d56738e7a0ea8a (diff)
parent281d0c962752fb40866dd8d4cade68656f34bd1f (diff)
downloadlinux-4be240b18aa67b1144af546bea2d7cad1b75c19b.tar.xz
Merge tag 'memcpy-v5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull FORTIFY_SOURCE updates from Kees Cook: "This series consists of two halves: - strict compile-time buffer size checking under FORTIFY_SOURCE for the memcpy()-family of functions (for extensive details and rationale, see the first commit) - enabling FORTIFY_SOURCE for Clang, which has had many overlapping bugs that we've finally worked past" * tag 'memcpy-v5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: fortify: Add Clang support fortify: Make sure strlen() may still be used as a constant expression fortify: Use __diagnose_as() for better diagnostic coverage fortify: Make pointer arguments const Compiler Attributes: Add __diagnose_as for Clang Compiler Attributes: Add __overloadable for Clang Compiler Attributes: Add __pass_object_size for Clang fortify: Replace open-coded __gnu_inline attribute fortify: Update compile-time tests for Clang 14 fortify: Detect struct member overflows in memset() at compile-time fortify: Detect struct member overflows in memmove() at compile-time fortify: Detect struct member overflows in memcpy() at compile-time
-rw-r--r--arch/x86/boot/compressed/misc.c3
-rw-r--r--arch/x86/lib/memcpy_32.c1
-rw-r--r--include/linux/compiler_attributes.h39
-rw-r--r--include/linux/fortify-string.h238
-rw-r--r--lib/Makefile3
-rw-r--r--lib/string_helpers.c6
-rw-r--r--lib/test_fortify/read_overflow2_field-memcpy.c5
-rw-r--r--lib/test_fortify/read_overflow2_field-memmove.c5
-rw-r--r--lib/test_fortify/write_overflow_field-memcpy.c5
-rw-r--r--lib/test_fortify/write_overflow_field-memmove.c5
-rw-r--r--lib/test_fortify/write_overflow_field-memset.c5
-rw-r--r--scripts/test_fortify.sh8
-rw-r--r--security/Kconfig5
13 files changed, 272 insertions, 56 deletions
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index a4339cb2d247..1cdcaf34ee36 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -37,10 +37,11 @@
* try to define their own functions if these are not defined as macros.
*/
#define memzero(s, n) memset((s), 0, (n))
+#ifndef memmove
#define memmove memmove
-
/* Functions used by the included decompressor code below. */
void *memmove(void *dest, const void *src, size_t n);
+#endif
/*
* This is set up by the setup-routine at boot-time
diff --git a/arch/x86/lib/memcpy_32.c b/arch/x86/lib/memcpy_32.c
index 3a6e6cfe8c35..ef3af7ff2c8a 100644
--- a/arch/x86/lib/memcpy_32.c
+++ b/arch/x86/lib/memcpy_32.c
@@ -4,6 +4,7 @@
#undef memcpy
#undef memset
+#undef memmove
__visible void *memcpy(void *to, const void *from, size_t n)
{
diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
index 37e260020221..445e80517cab 100644
--- a/include/linux/compiler_attributes.h
+++ b/include/linux/compiler_attributes.h
@@ -101,6 +101,19 @@
#endif
/*
+ * Optional: not supported by gcc
+ * Optional: only supported since clang >= 14.0
+ * Optional: not supported by icc
+ *
+ * clang: https://clang.llvm.org/docs/AttributeReference.html#diagnose_as_builtin
+ */
+#if __has_attribute(__diagnose_as_builtin__)
+# define __diagnose_as(builtin...) __attribute__((__diagnose_as_builtin__(builtin)))
+#else
+# define __diagnose_as(builtin...)
+#endif
+
+/*
* Don't. Just don't. See commit 771c035372a0 ("deprecate the '__deprecated'
* attribute warnings entirely and for good") for more information.
*
@@ -258,12 +271,38 @@
#define __noreturn __attribute__((__noreturn__))
/*
+ * Optional: not supported by gcc.
+ * Optional: not supported by icc.
+ *
+ * clang: https://clang.llvm.org/docs/AttributeReference.html#overloadable
+ */
+#if __has_attribute(__overloadable__)
+# define __overloadable __attribute__((__overloadable__))
+#else
+# define __overloadable
+#endif
+
+/*
* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-packed-type-attribute
* clang: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-packed-variable-attribute
*/
#define __packed __attribute__((__packed__))
/*
+ * Note: the "type" argument should match any __builtin_object_size(p, type) usage.
+ *
+ * Optional: not supported by gcc.
+ * Optional: not supported by icc.
+ *
+ * clang: https://clang.llvm.org/docs/AttributeReference.html#pass-object-size-pass-dynamic-object-size
+ */
+#if __has_attribute(__pass_object_size__)
+# define __pass_object_size(type) __attribute__((__pass_object_size__(type)))
+#else
+# define __pass_object_size(type)
+#endif
+
+/*
* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-pure-function-attribute
*/
#define __pure __attribute__((__pure__))
diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h
index a6cd6815f249..295637a66c46 100644
--- a/include/linux/fortify-string.h
+++ b/include/linux/fortify-string.h
@@ -2,13 +2,17 @@
#ifndef _LINUX_FORTIFY_STRING_H_
#define _LINUX_FORTIFY_STRING_H_
-#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))
+#include <linux/const.h>
+
+#define __FORTIFY_INLINE extern __always_inline __gnu_inline __overloadable
#define __RENAME(x) __asm__(#x)
void fortify_panic(const char *name) __noreturn __cold;
void __read_overflow(void) __compiletime_error("detected read beyond size of object (1st parameter)");
void __read_overflow2(void) __compiletime_error("detected read beyond size of object (2nd parameter)");
+void __read_overflow2_field(size_t avail, size_t wanted) __compiletime_warning("detected read beyond size of field (2nd parameter); maybe use struct_group()?");
void __write_overflow(void) __compiletime_error("detected write beyond size of object (1st parameter)");
+void __write_overflow_field(size_t avail, size_t wanted) __compiletime_warning("detected write beyond size of field (1st parameter); maybe use struct_group()?");
#define __compiletime_strlen(p) \
({ \
@@ -48,7 +52,17 @@ extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size)
#define __underlying_strncpy __builtin_strncpy
#endif
-__FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size)
+/*
+ * Clang's use of __builtin_object_size() within inlines needs hinting via
+ * __pass_object_size(). The preference is to only ever use type 1 (member
+ * size, rather than struct size), but there remain some stragglers using
+ * type 0 that will be converted in the future.
+ */
+#define POS __pass_object_size(1)
+#define POS0 __pass_object_size(0)
+
+__FORTIFY_INLINE __diagnose_as(__builtin_strncpy, 1, 2, 3)
+char *strncpy(char * const POS p, const char *q, __kernel_size_t size)
{
size_t p_size = __builtin_object_size(p, 1);
@@ -59,7 +73,8 @@ __FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size)
return __underlying_strncpy(p, q, size);
}
-__FORTIFY_INLINE char *strcat(char *p, const char *q)
+__FORTIFY_INLINE __diagnose_as(__builtin_strcat, 1, 2)
+char *strcat(char * const POS p, const char *q)
{
size_t p_size = __builtin_object_size(p, 1);
@@ -71,7 +86,7 @@ __FORTIFY_INLINE char *strcat(char *p, const char *q)
}
extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
-__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
+__FORTIFY_INLINE __kernel_size_t strnlen(const char * const POS p, __kernel_size_t maxlen)
{
size_t p_size = __builtin_object_size(p, 1);
size_t p_len = __compiletime_strlen(p);
@@ -91,8 +106,16 @@ __FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
return ret;
}
-/* defined after fortified strnlen to reuse it. */
-__FORTIFY_INLINE __kernel_size_t strlen(const char *p)
+/*
+ * Defined after fortified strnlen to reuse it. However, it must still be
+ * possible for strlen() to be used on compile-time strings for use in
+ * static initializers (i.e. as a constant expression).
+ */
+#define strlen(p) \
+ __builtin_choose_expr(__is_constexpr(__builtin_strlen(p)), \
+ __builtin_strlen(p), __fortify_strlen(p))
+__FORTIFY_INLINE __diagnose_as(__builtin_strlen, 1)
+__kernel_size_t __fortify_strlen(const char * const POS p)
{
__kernel_size_t ret;
size_t p_size = __builtin_object_size(p, 1);
@@ -108,7 +131,7 @@ __FORTIFY_INLINE __kernel_size_t strlen(const char *p)
/* defined after fortified strlen to reuse it */
extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy);
-__FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size)
+__FORTIFY_INLINE size_t strlcpy(char * const POS p, const char * const POS q, size_t size)
{
size_t p_size = __builtin_object_size(p, 1);
size_t q_size = __builtin_object_size(q, 1);
@@ -135,7 +158,7 @@ __FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size)
/* defined after fortified strnlen to reuse it */
extern ssize_t __real_strscpy(char *, const char *, size_t) __RENAME(strscpy);
-__FORTIFY_INLINE ssize_t strscpy(char *p, const char *q, size_t size)
+__FORTIFY_INLINE ssize_t strscpy(char * const POS p, const char * const POS q, size_t size)
{
size_t len;
/* Use string size rather than possible enclosing struct size. */
@@ -181,7 +204,8 @@ __FORTIFY_INLINE ssize_t strscpy(char *p, const char *q, size_t size)
}
/* defined after fortified strlen and strnlen to reuse them */
-__FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count)
+__FORTIFY_INLINE __diagnose_as(__builtin_strncat, 1, 2, 3)
+char *strncat(char * const POS p, const char * const POS q, __kernel_size_t count)
{
size_t p_len, copy_len;
size_t p_size = __builtin_object_size(p, 1);
@@ -198,51 +222,161 @@ __FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count)
return p;
}
-__FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size)
+__FORTIFY_INLINE void fortify_memset_chk(__kernel_size_t size,
+ const size_t p_size,
+ const size_t p_size_field)
{
- size_t p_size = __builtin_object_size(p, 0);
-
- if (__builtin_constant_p(size) && p_size < size)
- __write_overflow();
- if (p_size < size)
- fortify_panic(__func__);
- return __underlying_memset(p, c, size);
-}
-
-__FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- size_t q_size = __builtin_object_size(q, 0);
-
if (__builtin_constant_p(size)) {
- if (p_size < size)
+ /*
+ * Length argument is a constant expression, so we
+ * can perform compile-time bounds checking where
+ * buffer sizes are known.
+ */
+
+ /* Error when size is larger than enclosing struct. */
+ if (p_size > p_size_field && p_size < size)
__write_overflow();
- if (q_size < size)
- __read_overflow2();
+
+ /* Warn when write size is larger than dest field. */
+ if (p_size_field < size)
+ __write_overflow_field(p_size_field, size);
}
- if (p_size < size || q_size < size)
- fortify_panic(__func__);
- return __underlying_memcpy(p, q, size);
+ /*
+ * At this point, length argument may not be a constant expression,
+ * so run-time bounds checking can be done where buffer sizes are
+ * known. (This is not an "else" because the above checks may only
+ * be compile-time warnings, and we want to still warn for run-time
+ * overflows.)
+ */
+
+ /*
+ * Always stop accesses beyond the struct that contains the
+ * field, when the buffer's remaining size is known.
+ * (The -1 test is to optimize away checks where the buffer
+ * lengths are unknown.)
+ */
+ if (p_size != (size_t)(-1) && p_size < size)
+ fortify_panic("memset");
}
-__FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- size_t q_size = __builtin_object_size(q, 0);
+#define __fortify_memset_chk(p, c, size, p_size, p_size_field) ({ \
+ size_t __fortify_size = (size_t)(size); \
+ fortify_memset_chk(__fortify_size, p_size, p_size_field), \
+ __underlying_memset(p, c, __fortify_size); \
+})
+/*
+ * __builtin_object_size() must be captured here to avoid evaluating argument
+ * side-effects further into the macro layers.
+ */
+#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
+ __builtin_object_size(p, 0), __builtin_object_size(p, 1))
+
+/*
+ * To make sure the compiler can enforce protection against buffer overflows,
+ * memcpy(), memmove(), and memset() must not be used beyond individual
+ * struct members. If you need to copy across multiple members, please use
+ * struct_group() to create a named mirror of an anonymous struct union.
+ * (e.g. see struct sk_buff.) Read overflow checking is currently only
+ * done when a write overflow is also present, or when building with W=1.
+ *
+ * Mitigation coverage matrix
+ * Bounds checking at:
+ * +-------+-------+-------+-------+
+ * | Compile time | Run time |
+ * memcpy() argument sizes: | write | read | write | read |
+ * dest source length +-------+-------+-------+-------+
+ * memcpy(known, known, constant) | y | y | n/a | n/a |
+ * memcpy(known, unknown, constant) | y | n | n/a | V |
+ * memcpy(known, known, dynamic) | n | n | B | B |
+ * memcpy(known, unknown, dynamic) | n | n | B | V |
+ * memcpy(unknown, known, constant) | n | y | V | n/a |
+ * memcpy(unknown, unknown, constant) | n | n | V | V |
+ * memcpy(unknown, known, dynamic) | n | n | V | B |
+ * memcpy(unknown, unknown, dynamic) | n | n | V | V |
+ * +-------+-------+-------+-------+
+ *
+ * y = perform deterministic compile-time bounds checking
+ * n = cannot perform deterministic compile-time bounds checking
+ * n/a = no run-time bounds checking needed since compile-time deterministic
+ * B = can perform run-time bounds checking (currently unimplemented)
+ * V = vulnerable to run-time overflow (will need refactoring to solve)
+ *
+ */
+__FORTIFY_INLINE void fortify_memcpy_chk(__kernel_size_t size,
+ const size_t p_size,
+ const size_t q_size,
+ const size_t p_size_field,
+ const size_t q_size_field,
+ const char *func)
+{
if (__builtin_constant_p(size)) {
- if (p_size < size)
+ /*
+ * Length argument is a constant expression, so we
+ * can perform compile-time bounds checking where
+ * buffer sizes are known.
+ */
+
+ /* Error when size is larger than enclosing struct. */
+ if (p_size > p_size_field && p_size < size)
__write_overflow();
- if (q_size < size)
+ if (q_size > q_size_field && q_size < size)
__read_overflow2();
+
+ /* Warn when write size argument larger than dest field. */
+ if (p_size_field < size)
+ __write_overflow_field(p_size_field, size);
+ /*
+ * Warn for source field over-read when building with W=1
+ * or when an over-write happened, so both can be fixed at
+ * the same time.
+ */
+ if ((IS_ENABLED(KBUILD_EXTRA_WARN1) || p_size_field < size) &&
+ q_size_field < size)
+ __read_overflow2_field(q_size_field, size);
}
- if (p_size < size || q_size < size)
- fortify_panic(__func__);
- return __underlying_memmove(p, q, size);
+ /*
+ * At this point, length argument may not be a constant expression,
+ * so run-time bounds checking can be done where buffer sizes are
+ * known. (This is not an "else" because the above checks may only
+ * be compile-time warnings, and we want to still warn for run-time
+ * overflows.)
+ */
+
+ /*
+ * Always stop accesses beyond the struct that contains the
+ * field, when the buffer's remaining size is known.
+ * (The -1 test is to optimize away checks where the buffer
+ * lengths are unknown.)
+ */
+ if ((p_size != (size_t)(-1) && p_size < size) ||
+ (q_size != (size_t)(-1) && q_size < size))
+ fortify_panic(func);
}
+#define __fortify_memcpy_chk(p, q, size, p_size, q_size, \
+ p_size_field, q_size_field, op) ({ \
+ size_t __fortify_size = (size_t)(size); \
+ fortify_memcpy_chk(__fortify_size, p_size, q_size, \
+ p_size_field, q_size_field, #op); \
+ __underlying_##op(p, q, __fortify_size); \
+})
+
+/*
+ * __builtin_object_size() must be captured here to avoid evaluating argument
+ * side-effects further into the macro layers.
+ */
+#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
+ __builtin_object_size(p, 0), __builtin_object_size(q, 0), \
+ __builtin_object_size(p, 1), __builtin_object_size(q, 1), \
+ memcpy)
+#define memmove(p, q, s) __fortify_memcpy_chk(p, q, s, \
+ __builtin_object_size(p, 0), __builtin_object_size(q, 0), \
+ __builtin_object_size(p, 1), __builtin_object_size(q, 1), \
+ memmove)
+
extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan);
-__FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size)
+__FORTIFY_INLINE void *memscan(void * const POS0 p, int c, __kernel_size_t size)
{
size_t p_size = __builtin_object_size(p, 0);
@@ -253,7 +387,8 @@ __FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size)
return __real_memscan(p, c, size);
}
-__FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size)
+__FORTIFY_INLINE __diagnose_as(__builtin_memcmp, 1, 2, 3)
+int memcmp(const void * const POS0 p, const void * const POS0 q, __kernel_size_t size)
{
size_t p_size = __builtin_object_size(p, 0);
size_t q_size = __builtin_object_size(q, 0);
@@ -269,7 +404,8 @@ __FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size)
return __underlying_memcmp(p, q, size);
}
-__FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size)
+__FORTIFY_INLINE __diagnose_as(__builtin_memchr, 1, 2, 3)
+void *memchr(const void * const POS0 p, int c, __kernel_size_t size)
{
size_t p_size = __builtin_object_size(p, 0);
@@ -281,7 +417,7 @@ __FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size)
}
void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv);
-__FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size)
+__FORTIFY_INLINE void *memchr_inv(const void * const POS0 p, int c, size_t size)
{
size_t p_size = __builtin_object_size(p, 0);
@@ -293,7 +429,7 @@ __FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size)
}
extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup);
-__FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp)
+__FORTIFY_INLINE void *kmemdup(const void * const POS0 p, size_t size, gfp_t gfp)
{
size_t p_size = __builtin_object_size(p, 0);
@@ -304,13 +440,15 @@ __FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp)
return __real_kmemdup(p, size, gfp);
}
-/* defined after fortified strlen and memcpy to reuse them */
-__FORTIFY_INLINE char *strcpy(char *p, const char *q)
+/* Defined after fortified strlen to reuse it. */
+__FORTIFY_INLINE __diagnose_as(__builtin_strcpy, 1, 2)
+char *strcpy(char * const POS p, const char * const POS q)
{
size_t p_size = __builtin_object_size(p, 1);
size_t q_size = __builtin_object_size(q, 1);
size_t size;
+ /* If neither buffer size is known, immediately give up. */
if (p_size == (size_t)-1 && q_size == (size_t)-1)
return __underlying_strcpy(p, q);
size = strlen(q) + 1;
@@ -320,20 +458,20 @@ __FORTIFY_INLINE char *strcpy(char *p, const char *q)
/* Run-time check for dynamic size overflow. */
if (p_size < size)
fortify_panic(__func__);
- memcpy(p, q, size);
+ __underlying_memcpy(p, q, size);
return p;
}
/* Don't use these outside the FORITFY_SOURCE implementation */
#undef __underlying_memchr
#undef __underlying_memcmp
-#undef __underlying_memcpy
-#undef __underlying_memmove
-#undef __underlying_memset
#undef __underlying_strcat
#undef __underlying_strcpy
#undef __underlying_strlen
#undef __underlying_strncat
#undef __underlying_strncpy
+#undef POS
+#undef POS0
+
#endif /* _LINUX_FORTIFY_STRING_H_ */
diff --git a/lib/Makefile b/lib/Makefile
index df001b876930..6b9ffc1bd1ee 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -377,7 +377,8 @@ TEST_FORTIFY_LOG = test_fortify.log
quiet_cmd_test_fortify = TEST $@
cmd_test_fortify = $(CONFIG_SHELL) $(srctree)/scripts/test_fortify.sh \
$< $@ "$(NM)" $(CC) $(c_flags) \
- $(call cc-disable-warning,fortify-source)
+ $(call cc-disable-warning,fortify-source) \
+ -DKBUILD_EXTRA_WARN1
targets += $(TEST_FORTIFY_LOGS)
clean-files += $(TEST_FORTIFY_LOGS)
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 90f9f1b7afec..4f877e9551d5 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -968,6 +968,12 @@ void memcpy_and_pad(void *dest, size_t dest_len, const void *src, size_t count,
EXPORT_SYMBOL(memcpy_and_pad);
#ifdef CONFIG_FORTIFY_SOURCE
+/* These are placeholders for fortify compile-time warnings. */
+void __read_overflow2_field(size_t avail, size_t wanted) { }
+EXPORT_SYMBOL(__read_overflow2_field);
+void __write_overflow_field(size_t avail, size_t wanted) { }
+EXPORT_SYMBOL(__write_overflow_field);
+
void fortify_panic(const char *name)
{
pr_emerg("detected buffer overflow in %s\n", name);
diff --git a/lib/test_fortify/read_overflow2_field-memcpy.c b/lib/test_fortify/read_overflow2_field-memcpy.c
new file mode 100644
index 000000000000..de9569266223
--- /dev/null
+++ b/lib/test_fortify/read_overflow2_field-memcpy.c
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST \
+ memcpy(large, instance.buf, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"
diff --git a/lib/test_fortify/read_overflow2_field-memmove.c b/lib/test_fortify/read_overflow2_field-memmove.c
new file mode 100644
index 000000000000..6cc2724c8f62
--- /dev/null
+++ b/lib/test_fortify/read_overflow2_field-memmove.c
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST \
+ memmove(large, instance.buf, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"
diff --git a/lib/test_fortify/write_overflow_field-memcpy.c b/lib/test_fortify/write_overflow_field-memcpy.c
new file mode 100644
index 000000000000..28cc81058dd3
--- /dev/null
+++ b/lib/test_fortify/write_overflow_field-memcpy.c
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST \
+ memcpy(instance.buf, large, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"
diff --git a/lib/test_fortify/write_overflow_field-memmove.c b/lib/test_fortify/write_overflow_field-memmove.c
new file mode 100644
index 000000000000..377fcf9bb2fd
--- /dev/null
+++ b/lib/test_fortify/write_overflow_field-memmove.c
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST \
+ memmove(instance.buf, large, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"
diff --git a/lib/test_fortify/write_overflow_field-memset.c b/lib/test_fortify/write_overflow_field-memset.c
new file mode 100644
index 000000000000..2331da26909e
--- /dev/null
+++ b/lib/test_fortify/write_overflow_field-memset.c
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST \
+ memset(instance.buf, 0x42, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"
diff --git a/scripts/test_fortify.sh b/scripts/test_fortify.sh
index a4da365508f0..c2688ab8281d 100644
--- a/scripts/test_fortify.sh
+++ b/scripts/test_fortify.sh
@@ -46,8 +46,12 @@ if "$@" -Werror -c "$IN" -o "$OUT".o 2> "$TMP" ; then
status="warning: unsafe ${FUNC}() usage lacked '$WANT' symbol in $IN"
fi
else
- # If the build failed, check for the warning in the stderr (gcc).
- if ! grep -q -m1 "error: call to .\b${WANT}\b." "$TMP" ; then
+ # If the build failed, check for the warning in the stderr.
+ # GCC:
+ # ./include/linux/fortify-string.h:316:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
+ # Clang 14:
+ # ./include/linux/fortify-string.h:316:4: error: call to __write_overflow_field declared with 'warning' attribute: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
+ if ! grep -Eq -m1 "error: call to .?\b${WANT}\b.?" "$TMP" ; then
status="warning: unsafe ${FUNC}() usage lacked '$WANT' warning in $IN"
fi
fi
diff --git a/security/Kconfig b/security/Kconfig
index 0b847f435beb..1d2d71cc1f36 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -177,9 +177,10 @@ config HARDENED_USERCOPY_PAGESPAN
config FORTIFY_SOURCE
bool "Harden common str/mem functions against buffer overflows"
depends on ARCH_HAS_FORTIFY_SOURCE
- # https://bugs.llvm.org/show_bug.cgi?id=50322
# https://bugs.llvm.org/show_bug.cgi?id=41459
- depends on !CC_IS_CLANG
+ depends on !CC_IS_CLANG || CLANG_VERSION >= 120001
+ # https://github.com/llvm/llvm-project/issues/53645
+ depends on !CC_IS_CLANG || !X86_32
help
Detect overflows of buffers in common string and memory functions
where the compiler can determine and validate the buffer sizes.