linux-kernel - Re: [PATCH v8 4/5] treewide: Switch memcpy() users of 'task->comm' to a more safer implementation

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Message-ID: <3dd2e56c-667c-63cd-2103-44265b34c45c@igalia.com>
Date: Fri, 22 Aug 2025 17:35:17 +0530
From: Bhupesh Sharma <bhsharma@...lia.com>
To: Steven Rostedt <rostedt@...dmis.org>, Bhupesh <bhupesh@...lia.com>
Cc: akpm@...ux-foundation.org, kernel-dev@...lia.com,
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 linux-perf-users@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-mm@...ck.org, oliver.sang@...el.com, lkp@...el.com,
 laoar.shao@...il.com, pmladek@...e.com, mathieu.desnoyers@...icios.com,
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 mgorman@...e.de, vschneid@...hat.com, linux-trace-kernel@...r.kernel.org,
 kees@...nel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH v8 4/5] treewide: Switch memcpy() users of 'task->comm' to
 a more safer implementation



On 8/21/25 10:13 PM, Steven Rostedt wrote:
> On Thu, 21 Aug 2025 15:51:51 +0530
> Bhupesh <bhupesh@...lia.com> wrote:
>
>> +static __always_inline void
>> +	__cstr_array_copy(char *dst, const char *src,
>> +			  __kernel_size_t size)
>> +{
>> +	memcpy(dst, src, size);
>> +	dst[size] = 0;
> Shouldn't this be: dst[size - 1] = 0;
>
> ?
>
> Perhaps also add:
>
> 	BUILD_BUG_ON(size == 0);
>
>
Ok, will add this in v9.

Thanks.