Re: [PATCH] srp_daemon: Avoid extra permissions for the lock file

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On 2020-08-19 07:17, Sergey Gorenko wrote:
> There is no need to create a world-writable lock file.
> It's enough to have an RW permission for the file owner only.
> 
> Signed-off-by: Sergey Gorenko <sergeygo@xxxxxxxxxx>
> Reviewed-by: Max Gurtovoy <mgurtovoy@xxxxxxxxxx>
> ---
>  srp_daemon/srp_daemon.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/srp_daemon/srp_daemon.c b/srp_daemon/srp_daemon.c
> index f14d9f56c9f2..fcf94537cebb 100644
> --- a/srp_daemon/srp_daemon.c
> +++ b/srp_daemon/srp_daemon.c
> @@ -142,7 +142,6 @@ static int check_process_uniqueness(struct config_t *conf)
>  		return -1;
>  	}
>  
> -	fchmod(fd, S_IRUSR|S_IRGRP|S_IROTH|S_IWUSR|S_IWGRP|S_IWOTH);
>  	if (0 != lockf(fd, F_TLOCK, 0)) {
>  		pr_err("failed to lock %s (errno: %d). possibly another "
>  		       "srp_daemon is locking it\n", path, errno);

I think the fchmod() call was introduced by commit ee138ce1e40d ("Cause
srp_daemon launch to fail if another srp_daemon is already working on the
same HCA port."). Has it been verified that with this change applied that
mechanism still works?

Anyway, please add a reference to that commit in the patch description.

Thanks,

Bart.






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