Re: [PATCH v9 1/8] overflow: Move and add few utility macros into overflow

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On 24.08.2022 10:45, Gwan-gyeong Mun wrote:
It moves overflows_type utility macro into overflow header from i915_utils
header. The overflows_type can be used to catch the truncaion (overflow)
between different data types. And it adds check_assign() macro which
performs an assigning source value into destination ptr along with an
overflow check. overflow_type macro has been improved to handle the signbit
by gcc's built-in overflow check function. And it adds overflows_ptr()
helper macro for checking the overflows between a value and a pointer
type/value.

v3: Add is_type_unsigned() macro (Mauro)
     Modify overflows_type() macro to consider signed data types (Mauro)
     Fix the problem that safe_conversion() macro always returns true
v4: Fix kernel-doc markups
v6: Move macro addition location so that it can be used by other than drm
     subsystem (Jani, Mauro, Andi)
     Change is_type_unsigned to is_unsigned_type to have the same name form
     as is_signed_type macro
v8: Add check_assign() and remove safe_conversion() (Kees)
     Fix overflows_type() to use gcc's built-in overflow function (Andrzej)
     Add overflows_ptr() to allow overflow checking when assigning a value
     into a pointer variable (G.G.)
v9: Fix overflows_type() to use __builtin_add_overflow() instead of
     __builtin_add_overflow_p() (Andrzej)
     Fix overflows_ptr() to use overflows_type() with the unsigned long type
     (Andrzej)

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
Cc: Mauro Carvalho Chehab <mauro.chehab@xxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> (v5)
---

Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>

Regards
Andrzej



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