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Date: Fri, 1 May 2020 14:58:37 -0700
From: Kees Cook <keescook@...omium.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Julien Grall <julien.grall@....com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ubsan: fix gcc-10 warnings
On Wed, Apr 29, 2020 at 08:59:35PM +0200, Arnd Bergmann wrote:
> The latest compiler expects slightly different function prototypes
> for the ubsan helpers:
>
> lib/ubsan.c:192:6: error: conflicting types for built-in function '__ubsan_handle_add_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
> 192 | void __ubsan_handle_add_overflow(struct overflow_data *data,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> lib/ubsan.c:200:6: error: conflicting types for built-in function '__ubsan_handle_sub_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
> 200 | void __ubsan_handle_sub_overflow(struct overflow_data *data,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> lib/ubsan.c:207:6: error: conflicting types for built-in function '__ubsan_handle_mul_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
> 207 | void __ubsan_handle_mul_overflow(struct overflow_data *data,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> lib/ubsan.c:214:6: error: conflicting types for built-in function '__ubsan_handle_negate_overflow'; expected 'void(void *, void *)' [-Werror=builtin-declaration-mismatch]
> 214 | void __ubsan_handle_negate_overflow(struct overflow_data *data,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> lib/ubsan.c:234:6: error: conflicting types for built-in function '__ubsan_handle_divrem_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
> 234 | void __ubsan_handle_divrem_overflow(struct overflow_data *data,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Change the Linux implementation to match these, using a local
> typed pointer.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Thanks for that!
Reviewed-by: Kees Cook <keescook@...omium.org>
-Kees
> ---
> lib/ubsan.c | 33 +++++++++++++++++----------------
> 1 file changed, 17 insertions(+), 16 deletions(-)
>
> diff --git a/lib/ubsan.c b/lib/ubsan.c
> index f8c0ccf35f29..cb9af3f6b77e 100644
> --- a/lib/ubsan.c
> +++ b/lib/ubsan.c
> @@ -189,7 +189,7 @@ static void handle_overflow(struct overflow_data *data, void *lhs,
> ubsan_epilogue();
> }
>
> -void __ubsan_handle_add_overflow(struct overflow_data *data,
> +void __ubsan_handle_add_overflow(void *data,
> void *lhs, void *rhs)
> {
>
> @@ -197,23 +197,23 @@ void __ubsan_handle_add_overflow(struct overflow_data *data,
> }
> EXPORT_SYMBOL(__ubsan_handle_add_overflow);
>
> -void __ubsan_handle_sub_overflow(struct overflow_data *data,
> +void __ubsan_handle_sub_overflow(void *data,
> void *lhs, void *rhs)
> {
> handle_overflow(data, lhs, rhs, '-');
> }
> EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
>
> -void __ubsan_handle_mul_overflow(struct overflow_data *data,
> +void __ubsan_handle_mul_overflow(void *data,
> void *lhs, void *rhs)
> {
> handle_overflow(data, lhs, rhs, '*');
> }
> EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
>
> -void __ubsan_handle_negate_overflow(struct overflow_data *data,
> - void *old_val)
> +void __ubsan_handle_negate_overflow(void *_data, void *old_val)
> {
> + struct overflow_data *data = _data;
> char old_val_str[VALUE_LENGTH];
>
> if (suppress_report(&data->location))
> @@ -231,9 +231,9 @@ void __ubsan_handle_negate_overflow(struct overflow_data *data,
> EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
>
>
> -void __ubsan_handle_divrem_overflow(struct overflow_data *data,
> - void *lhs, void *rhs)
> +void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
> {
> + struct overflow_data *data = _data;
> char rhs_val_str[VALUE_LENGTH];
>
> if (suppress_report(&data->location))
> @@ -326,10 +326,9 @@ void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
> }
> EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
>
> -void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
> - void *ptr)
> +void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr)
> {
> -
> + struct type_mismatch_data_v1 *data = _data;
> struct type_mismatch_data_common common_data = {
> .location = &data->location,
> .type = data->type,
> @@ -341,8 +340,9 @@ void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
> }
> EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
>
> -void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
> +void __ubsan_handle_out_of_bounds(void *_data, void *index)
> {
> + struct out_of_bounds_data *data = _data;
> char index_str[VALUE_LENGTH];
>
> if (suppress_report(&data->location))
> @@ -357,9 +357,9 @@ void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
> }
> EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
>
> -void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
> - void *lhs, void *rhs)
> +void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
> {
> + struct shift_out_of_bounds_data *data = _data;
> struct type_descriptor *rhs_type = data->rhs_type;
> struct type_descriptor *lhs_type = data->lhs_type;
> char rhs_str[VALUE_LENGTH];
> @@ -399,8 +399,9 @@ void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
> EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
>
>
> -void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
> +void __ubsan_handle_builtin_unreachable(void *_data)
> {
> + struct unreachable_data *data = _data;
> ubsan_prologue(&data->location, "unreachable");
> pr_err("calling __builtin_unreachable()\n");
> ubsan_epilogue();
> @@ -408,9 +409,9 @@ 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,
> - void *val)
> +void __ubsan_handle_load_invalid_value(void *_data, void *val)
> {
> + struct invalid_value_data *data = _data;
> char val_str[VALUE_LENGTH];
>
> if (suppress_report(&data->location))
> --
> 2.26.0
>
--
Kees Cook
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