[PATCH 5.0 03/95] ubsan: Fix nasty -Wbuiltin-declaration-mismatch GCC-9 warnings

Greg Kroah-Hartman
2019-05-09T18:51:01Z

From: Andrey Ryabinin <aryabinin@virtuozzo.com>

commit f0996bc2978e02d2ea898101462b960f6119b18f upstream.

Building lib/ubsan.c with gcc-9 results in a ton of nasty warnings like
this one:

lib/ubsan.c warning: conflicting types for built-in function
‘__ubsan_handle_negate_overflow’; expected ‘void(void *, void *)’ [-Wbuiltin-declaration-mismatch]

The kernel's declarations of __ubsan_handle_*() often uses 'unsigned
long' types in parameters while GCC these parameters as 'void *' types,
hence the mismatch.

Fix this by using 'void *' to match GCC's declarations.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Fixes: c6d308534aef ("UBSAN: run-time undefined behavior sanity checker")
Cc: <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
lib/ubsan.c | 49 +++++++++++++++++++++++--------------------------
1 file changed, 23 insertions(+), 26 deletions(-)

--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -86,11 +86,13 @@ static bool is_inline_int(struct type_de
return bits <= inline_bits;
}

-static s_max get_signed_val(struct type_descriptor *type, unsigned long val)
+static s_max get_signed_val(struct type_descriptor *type, void *val)
{
if (is_inline_int(type)) {
unsigned extra_bits = sizeof(s_max)*8 - type_bit_width(type);
- return ((s_max)val) << extra_bits >> extra_bits;
+ unsigned long ulong_val = (unsigned long)val;
+
+ return ((s_max)ulong_val) << extra_bits >> extra_bits;
}

if (type_bit_width(type) == 64)
@@ -99,15 +101,15 @@ static s_max get_signed_val(struct type_
return *(s_max *)val;
}

-static bool val_is_negative(struct type_descriptor *type, unsigned long val)
+static bool val_is_negative(struct type_descriptor *type, void *val)
{
return type_is_signed(type) && get_signed_val(type, val) < 0;
}

-static u_max get_unsigned_val(struct type_descriptor *type, unsigned long val)
+static u_max get_unsigned_val(struct type_descriptor *type, void *val)
{
if (is_inline_int(type))
- return val;
+ return (unsigned long)val;

if (type_bit_width(type) == 64)
return *(u64 *)val;
@@ -116,7 +118,7 @@ static u_max get_unsigned_val(struct typ
}

static void val_to_string(char *str, size_t size, struct type_descriptor *type,
- unsigned long value)
+ void *value)
{
if (type_is_int(type)) {
if (type_bit_width(type) == 128) {
@@ -163,8 +165,8 @@ static void ubsan_epilogue(unsigned long
current->in_ubsan--;
}

-static void handle_overflow(struct overflow_data *data, unsigned long lhs,
- unsigned long rhs, char op)
+static void handle_overflow(struct overflow_data *data, void *lhs,
+ void *rhs, char op)
{

struct type_descriptor *type = data->type;
@@ -191,8 +193,7 @@ static void handle_overflow(struct overf
}

void __ubsan_handle_add_overflow(struct overflow_data *data,
- unsigned long lhs,
- unsigned long rhs)
+ void *lhs, void *rhs)
{

handle_overflow(data, lhs, rhs, '+');
@@ -200,23 +201,21 @@ void __ubsan_handle_add_overflow(struct
EXPORT_SYMBOL(__ubsan_handle_add_overflow);

void __ubsan_handle_sub_overflow(struct overflow_data *data,
- unsigned long lhs,
- unsigned long rhs)
+ void *lhs, void *rhs)
{
handle_overflow(data, lhs, rhs, '-');
}
EXPORT_SYMBOL(__ubsan_handle_sub_overflow);

void __ubsan_handle_mul_overflow(struct overflow_data *data,
- unsigned long lhs,
- unsigned long rhs)
+ void *lhs, void *rhs)
{
handle_overflow(data, lhs, rhs, '*');
}
EXPORT_SYMBOL(__ubsan_handle_mul_overflow);

void __ubsan_handle_negate_overflow(struct overflow_data *data,
- unsigned long old_val)
+ void *old_val)
{
unsigned long flags;
char old_val_str[VALUE_LENGTH];
@@ -237,8 +236,7 @@ EXPORT_SYMBOL(__ubsan_handle_negate_over

void __ubsan_handle_divrem_overflow(struct overflow_data *data,
- unsigned long lhs,
- unsigned long rhs)
+ void *lhs, void *rhs)
{
unsigned long flags;
char rhs_val_str[VALUE_LENGTH];
@@ -323,7 +321,7 @@ static void ubsan_type_mismatch_common(s
}

void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
- unsigned long ptr)
+ void *ptr)
{
struct type_mismatch_data_common common_data = {
.location = &data->location,
@@ -332,12 +330,12 @@ void __ubsan_handle_type_mismatch(struct
.type_check_kind = data->type_check_kind
};

- ubsan_type_mismatch_common(&common_data, ptr);
+ ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch);

void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
- unsigned long ptr)
+ void *ptr)
{

struct type_mismatch_data_common common_data = {
@@ -347,12 +345,12 @@ void __ubsan_handle_type_mismatch_v1(str
.type_check_kind = data->type_check_kind
};

- ubsan_type_mismatch_common(&common_data, ptr);
+ ubsan_type_mismatch_common(&common_data, (unsigned long)ptr);
}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);

void __ubsan_handle_vla_bound_not_positive(struct vla_bound_data *data,
- unsigned long bound)
+ void *bound)
{
unsigned long flags;
char bound_str[VALUE_LENGTH];
@@ -369,8 +367,7 @@ void __ubsan_handle_vla_bound_not_positi
}
EXPORT_SYMBOL(__ubsan_handle_vla_bound_not_positive);

-void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data,
- unsigned long index)
+void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
{
unsigned long flags;
char index_str[VALUE_LENGTH];
@@ -388,7 +385,7 @@ void __ubsan_handle_out_of_bounds(struct
EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);

void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
- unsigned long lhs, unsigned long rhs)
+ void *lhs, void *rhs)
{
unsigned long flags;
struct type_descriptor *rhs_type = data->rhs_type;
@@ -439,7 +436,7 @@ void __ubsan_handle_builtin_unreachable(
EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);

void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
- unsigned long val)
+ void *val)
{
unsigned long flags;
char val_str[VALUE_LENGTH];