ubsan: Fix nasty -Wbuiltin-declaration-mismatch GCC-9 warnings

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>

diff --git a/lib/ubsan.c b/lib/ubsan.c
index e4162f59a81ccacda275cd218193fb2ad34d71d3..1e9e2ab2553969403e2f725145b2e6873c0d2e3c 100644 (file)
--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -86,11 +86,13 @@ static bool is_inline_int(struct type_descriptor *type)
        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_descriptor *type, unsigned long val)
        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 type_descriptor *type, unsigned long val)
 }
 
 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 *flags)
        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 overflow_data *data, unsigned long lhs,
 }
 
 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 overflow_data *data,
 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_overflow);
 
 
 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(struct type_mismatch_data_common *data,
 }
 
 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_mismatch_data *data,
                .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(struct type_mismatch_data_v1 *data,
                .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_positive(struct vla_bound_data *data,
 }
 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 out_of_bounds_data *data,
 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(struct unreachable_data *data)
 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];