Subject: Re: [PATCH 0/2] friendlier handling of overflows in archive-tar

From: Junio C Hamano <[email-masked]>
Date: Tue, 21 Jun 2016 11:43:34 -0700

Jeff King <[email-masked]> writes:

> Junio, this is the jk/big-and-old-archive-tar topic.
>
> The interdiff is:
> ...
> diff --git a/archive-tar.c b/archive-tar.c
> index c7b85fd..ed562d4 100644
> --- a/archive-tar.c
> +++ b/archive-tar.c
> @@ -179,7 +179,7 @@ static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen)
>  
>  static inline unsigned long ustar_size(uintmax_t size)
>  {
> -	if (size < 077777777777UL)
> +	if (size <= 077777777777UL)
>  		return size;
>  	else
>  		return 0;
> @@ -187,7 +187,7 @@ static inline unsigned long ustar_size(uintmax_t size)
>  
>  static inline unsigned long ustar_mtime(time_t mtime)
>  {
> -	if (mtime < 077777777777UL)
> +	if (mtime <= 077777777777UL)
>  		return mtime;
>  	else
>  		return 0;
> @@ -299,7 +299,7 @@ static int write_tar_entry(struct archiver_args *args,
>  			memcpy(header.linkname, buffer, size);
>  	}
>  
> -	if (ustar_size(size) != size)
> +	if (S_ISREG(mode) && ustar_size(size) != size)
>  		strbuf_append_ext_header_uint(&ext_header, "size", size);
>  	if (ustar_mtime(args->time) != args->time)
>  		strbuf_append_ext_header_uint(&ext_header, "mtime", args->time);

Thanks.

By the way, I realized the naming mistake and the topic branch is
now named s/old/future/.  Size being big is one condition that needs
this fix, so is timestamp being from far future, not "old".