linux-kernel - Re: [PATCH] fix an endianness bug in ext4_encrypted_follow

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]

Message-ID: <1448566837.18647.16.camel@perches.com>
Date:	Thu, 26 Nov 2015 11:40:37 -0800
From:	Joe Perches <joe@...ches.com>
To:	Al Viro <viro@...IV.linux.org.uk>, Theodore Ts'o <tytso@....edu>,
	Julia Lawall <julia.lawall@...6.fr>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix an endianness bug in ext4_encrypted_follow_link()

(cc'ing Julia Lawall)

On Thu, 2015-11-26 at 15:27 +0000, Al Viro wrote:
> applying le32_to_cpu() to 16bit value is a bad idea...

Julia, perhaps you or your crew could produce a coccinelle test
for this class of error?

> diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
> index abe2401..e8e7af6 100644
> --- a/fs/ext4/symlink.c
> +++ b/fs/ext4/symlink.c
> @@ -52,7 +52,7 @@ static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cook
>  	/* Symlink is encrypted */
>  	sd = (struct ext4_encrypted_symlink_data *)caddr;
>  	cstr.name = sd->encrypted_path;
> -	cstr.len  = le32_to_cpu(sd->len);
> +	cstr.len  = le16_to_cpu(sd->len);
>  	if ((cstr.len +
>  	     sizeof(struct ext4_encrypted_symlink_data) - 1) >
>  	    max_size) {

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/