linux-kernel - Re: [PATCH] ubsan: add prototypes for internal functions

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Date:   Thu, 18 May 2023 01:43:43 +0000
From:   Fangrui Song <maskray@...gle.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     kasan-dev@...glegroups.com, Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Mukesh Ojha <quic_mojha@...cinc.com>,
        Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ubsan: add prototypes for internal functions

On 2023-05-17, Arnd Bergmann wrote:
>From: Arnd Bergmann <arnd@...db.de>
>
>Most of the functions in ubsan that are only called from generated
>code don't have a prototype, which W=1 builds warn about:
>
>lib/ubsan.c:226:6: error: no previous prototype for '__ubsan_handle_divrem_overflow' [-Werror=missing-prototypes]
>lib/ubsan.c:307:6: error: no previous prototype for '__ubsan_handle_type_mismatch' [-Werror=missing-prototypes]
>lib/ubsan.c:321:6: error: no previous prototype for '__ubsan_handle_type_mismatch_v1' [-Werror=missing-prototypes]
>lib/ubsan.c:335:6: error: no previous prototype for '__ubsan_handle_out_of_bounds' [-Werror=missing-prototypes]
>lib/ubsan.c:352:6: error: no previous prototype for '__ubsan_handle_shift_out_of_bounds' [-Werror=missing-prototypes]
>lib/ubsan.c:394:6: error: no previous prototype for '__ubsan_handle_builtin_unreachable' [-Werror=missing-prototypes]
>lib/ubsan.c:404:6: error: no previous prototype for '__ubsan_handle_load_invalid_value' [-Werror=missing-prototypes]
>
>Add prototypes for all of these to lib/ubsan.h, and remove the
>one that was already present in ubsan.c.
>
>Signed-off-by: Arnd Bergmann <arnd@...db.de>
>---
> lib/ubsan.c |  3 ---
> lib/ubsan.h | 11 +++++++++++
> 2 files changed, 11 insertions(+), 3 deletions(-)
>
>diff --git a/lib/ubsan.c b/lib/ubsan.c
>index e2cc4a799312..3f90810f9f42 100644
>--- a/lib/ubsan.c
>+++ b/lib/ubsan.c
>@@ -423,9 +423,6 @@ void __ubsan_handle_load_invalid_value(void *_data, void *val)
> }
> EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
>
>-void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
>-					 unsigned long align,
>-					 unsigned long offset);
> void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
> 					 unsigned long align,
> 					 unsigned long offset)
>diff --git a/lib/ubsan.h b/lib/ubsan.h
>index cc5cb94895a6..5d99ab81913b 100644
>--- a/lib/ubsan.h
>+++ b/lib/ubsan.h
>@@ -124,4 +124,15 @@ typedef s64 s_max;
> typedef u64 u_max;
> #endif
>
>+void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs);
>+void __ubsan_handle_type_mismatch(struct type_mismatch_data *data, void *ptr);
>+void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr);
>+void __ubsan_handle_out_of_bounds(void *_data, void *index);
>+void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs);
>+void __ubsan_handle_builtin_unreachable(void *_data);
>+void __ubsan_handle_load_invalid_value(void *_data, void *val);
>+void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
>+					 unsigned long align,
>+					 unsigned long offset);
>+
> #endif
>-- 
>2.39.2

Thanks. I've checked that these signatures match the definitions in
lib/ubsan.c and the order matches as well.

Reviewed-by: Fangrui Song <maskray@...gle.com>