linux-kernel - Re: [PATCH] replace strcpy with strscpy for safe copy

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Message-ID: <20251024093709.5115f8b0@pumpkin>
Date: Fri, 24 Oct 2025 09:37:09 +0100
From: David Laight <david.laight.linux@...il.com>
To: Biancaa Ramesh <biancaa2210329@....edu.in>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] replace strcpy with strscpy for safe copy

On Tue, 21 Oct 2025 20:27:00 +0530
Biancaa Ramesh <biancaa2210329@....edu.in> wrote:

A complete pile of bollocks....

> Signed-off-by: Biancaa Ramesh <biancaa2210329@....edu.in>
> ---
>  mm/shmem.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/mm/shmem.c b/mm/shmem.c
> index b9081b817d28..6e5a5d6fc7e9 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -657,17 +657,18 @@ static int shmem_parse_huge(const char *str)
>  	if (!str)
>  		return -EINVAL;
>  
> -	if (!strcmp(str, "never"))
> +	if (!strncmp(str,"never",strlen("never")+1)){
>  		huge = SHMEM_HUGE_NEVER;
> -	else if (!strcmp(str, "always"))
> +	}
> +	else if (!strncmp(str, "always", strlen("always") + 1))
>  		huge = SHMEM_HUGE_ALWAYS;
> -	else if (!strcmp(str, "within_size"))
> +	else if (!strncmp(str, "within_size",strlen("Within_size")+1))
>  		huge = SHMEM_HUGE_WITHIN_SIZE;
> -	else if (!strcmp(str, "advise"))
> +	else if (!strncmp(str,"advise",strlen("advise")+1))
>  		huge = SHMEM_HUGE_ADVISE;
> -	else if (!strcmp(str, "deny"))
> +	else if (!strncmp(str,"deny",strlen("deny")+1))
>  		huge = SHMEM_HUGE_DENY;
> -	else if (!strcmp(str, "force"))
> +	else if (!strncmp(str,"force",strlen("force")+1))
>  		huge = SHMEM_HUGE_FORCE;
>  	else
>  		return -EINVAL;
> @@ -5679,27 +5680,27 @@ static int __init setup_thp_shmem(char *str)
>  				goto err;
>  
>  			nr = end - start + 1;
> -			if (!strcmp(policy, "always")) {
> +			if (!strncmp(policy,"always",strlen("always")+1)){
>  				bitmap_set(&always, start, nr);
>  				bitmap_clear(&inherit, start, nr);
>  				bitmap_clear(&madvise, start, nr);
>  				bitmap_clear(&within_size, start, nr);
> -			} else if (!strcmp(policy, "advise")) {
> +			} else if (!strncmp(policy,"advise",strlen("advise")+1)){
>  				bitmap_set(&madvise, start, nr);
>  				bitmap_clear(&inherit, start, nr);
>  				bitmap_clear(&always, start, nr);
>  				bitmap_clear(&within_size, start, nr);
> -			} else if (!strcmp(policy, "inherit")) {
> +			} else if (!strncmp(policy,"inherit",strlen("inherit")+1)){
>  				bitmap_set(&inherit, start, nr);
>  				bitmap_clear(&madvise, start, nr);
>  				bitmap_clear(&always, start, nr);
>  				bitmap_clear(&within_size, start, nr);
> -			} else if (!strcmp(policy, "within_size")) {
> +			} else if (!strncmp(policy,"within_size",strlen("within_size")+1)){
>  				bitmap_set(&within_size, start, nr);
>  				bitmap_clear(&inherit, start, nr);
>  				bitmap_clear(&madvise, start, nr);
>  				bitmap_clear(&always, start, nr);
> -			} else if (!strcmp(policy, "never")) {
> +			} else if (!strncmp(policy,"never",strlen("never")+1)){
>  				bitmap_clear(&inherit, start, nr);
>  				bitmap_clear(&madvise, start, nr);
>  				bitmap_clear(&always, start, nr);