linux-kernel - Re: Security: Replace dac_mmap_min_addr to mmap_min_addr in cap_file

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Date:	Tue, 13 Apr 2010 23:02:02 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	wzt.wzt@...il.com
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, jmorris@...ei.org
Subject: Re: Security: Replace dac_mmap_min_addr to mmap_min_addr in 
	cap_file_mmap()

NAK NAK NAK

go back and reread the whole purpose for the separation.

-Eric

On Tue, Apr 13, 2010 at 10:48 PM,  <wzt.wzt@...il.com> wrote:
> cap_file_mmap() comments said "If the process is attempting to map
> memory below mmap_min_addr", if CONFIG_LSM_MMAP_MIN_ADDR is set,
> dac_mmap_min_addr is not equal mmap_min_addr, so replace dac_mmap_min_addr
> to mmap_min_addr seems to be better.
>
> Signed-off-by: Zhitong Wang <zhitong.wangzt@...baba-inc.com>
>
> ---
>  include/linux/security.h |    1 +
>  security/commoncap.c     |    2 +-
>  2 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 233d20b..61fd9e7 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -101,6 +101,7 @@ void reset_security_ops(void);
>  extern unsigned long mmap_min_addr;
>  extern unsigned long dac_mmap_min_addr;
>  #else
> +#define mmap_min_addr          0UL
>  #define dac_mmap_min_addr      0UL
>  #endif
>
> diff --git a/security/commoncap.c b/security/commoncap.c
> index 6166973..878cf89 100644
> --- a/security/commoncap.c
> +++ b/security/commoncap.c
> @@ -942,7 +942,7 @@ int cap_file_mmap(struct file *file, unsigned long reqprot,
>  {
>        int ret = 0;
>
> -       if (addr < dac_mmap_min_addr) {
> +       if (addr < mmap_min_addr) {
>                ret = cap_capable(current, current_cred(), CAP_SYS_RAWIO,
>                                  SECURITY_CAP_AUDIT);
>                /* set PF_SUPERPRIV if it turns out we allow the low mmap */
> --
> 1.6.5.3
>
> --
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