[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH v4 1/5] qemu/compiler: Define QEMU_NONSTRING

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v4 1/5] qemu/compiler: Define QEMU_NONSTRING
Date: Sun, 30 Dec 2018 09:28:23 +1100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1

On 12/29/18 4:33 AM, Philippe Mathieu-Daudé wrote:
> GCC 8 introduced the -Wstringop-truncation checker to detect truncation by
> the strncat and strncpy functions (closely related to -Wstringop-overflow,
> which detect buffer overflow by string-modifying functions declared in
> <string.h>).
> In tandem of -Wstringop-truncation, the "nonstring" attribute was added:
>   The nonstring variable attribute specifies that an object or member
>   declaration with type array of char, signed char, or unsigned char,
>   or pointer to such a type is intended to store character arrays that
>   do not necessarily contain a terminating NUL. This is useful in detecting
>   uses of such arrays or pointers with functions that expect NUL-terminated
>   strings, and to avoid warnings when such an array or pointer is used as
>   an argument to a bounded string manipulation function such as strncpy.
>   From the GCC manual: 
> https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-nonstring-variable-attribute
> Add the QEMU_NONSTRING macro which checks if the compiler supports this
> attribute.
> Suggested-by: Michael S. Tsirkin <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>
> Reviewed-by: Michael S. Tsirkin <address@hidden>
> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
> ---

Reviewed-by: Richard Henderson <address@hidden>


reply via email to

[Prev in Thread] Current Thread [Next in Thread]