linux-kernel - Re: [PATCH] Fix OOPS in show

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: <3ae72650708100523w45b4d5cbxf0ffbdc11cfb5e45@mail.gmail.com>
Date:	Fri, 10 Aug 2007 14:23:56 +0200
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Pavel Emelyanov" <xemul@...nvz.org>
Cc:	"Greg KH" <gregkh@...e.de>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>, devel@...nvz.org
Subject: Re: [PATCH] Fix OOPS in show_uevent()

On 8/10/07, Pavel Emelyanov <xemul@...nvz.org> wrote:
> The platform_uevent() callback called via
>   show_uevent()
>   dev_uevent()
>   platform_uevent()
> forgot to set NULL to the last envp pointer and this caused the
> show_uevent() oops while printing all the envp pointers like this:

> The last hunk in this patch fixes this.

Looks like the right fix, yes.

> The other problem is that the envp passed to bus, type and platform callbacks
> from dev_uevent() is the same, so the callbacks can overwrite the info, written
> by the others. Did I miss something important?

Sounds like a bug, yes.

But we still don't update the remaining buffer size and the remaining
array fields which are left after the call. Shouldn't we instead just
change the:
   int (*dev_uevent)(struct device *dev,
                                char **envp, int num_envp,
                                char *buffer, int buffer_size);
to:
  int (*dev_uevent)(struct device *dev,
                               char **envp, int num_envp, int *cur_index,
                               char *buffer, int buffer_size, int *cur_len);

like we do for:
  int add_uevent_var(char **envp, int num_envp, int *cur_index,
                                  char *buffer, int buffer_size, int *cur_len,
                                  const char *format, ...)

and along with the change of the callers, we would update the values
properly, so the next call has the correct numbers? There are 6
classes and something like 12 buses using this method, so it shouldn't
be too much trouble.

Thanks,
Kay
-
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/