Re: Security: Replace dac_mmap_min_addr to mmap_min_addr in cap_file_mmap()
From: Eric Paris
Date: Tue Apr 13 2010 - 23:02:12 EST
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@xxxxxxxxx> 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@xxxxxxxxxxxxxxx>
>
> ---
> 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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