linux-hardening - Re: [RFC][PATCH v3 2/3] Modify return value of nla

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 21 Oct 2020 16:48:37 -0700
From:   Kees Cook <keescook@...omium.org>
To:     laniel_francis@...vacyrequired.com
Cc:     linux-hardening@...r.kernel.org, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org
Subject: Re: [RFC][PATCH v3 2/3] Modify return value of nla_strlcpy to match
 that of strscpy.

On Tue, Oct 20, 2020 at 06:47:06PM +0200, laniel_francis@...vacyrequired.com wrote:
> From: Francis Laniel <laniel_francis@...vacyrequired.com>
> 
> nla_strlcpy now returns -E2BIG if src was truncated when written to dst.
> It also returns this error value if dstsize is 0 or higher than INT_MAX.
> 
> For example, if src is "foo\0" and dst is 3 bytes long, the result will be:
> 1. "foG" after memcpy (G means garbage).
> 2. "fo\0" after memset.
> 3. -E2BIG is returned because src was not completely written into dst.
> 
> The callers of nla_strlcpy were modified to take into account this modification.
> 
> Signed-off-by: Francis Laniel <laniel_francis@...vacyrequired.com>

This looks correct to me. Thanks for the respin!

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook