NOMMU: Optimise away the {dac_,}mmap_min_addr tests

In NOMMU mode clamp dac_mmap_min_addr to zero to cause the tests on it to be
skipped by the compiler.  We do this as the minimum mmap address doesn't make
any sense in NOMMU mode.

mmap_min_addr and round_hint_to_min() can be discarded entirely in NOMMU mode.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells 2009-12-15 19:27:45 +00:00 committed by James Morris
parent dd880fbe8e
commit 6e14154676
4 changed files with 12 additions and 1 deletions

View file

@ -95,8 +95,13 @@ struct seq_file;
extern int cap_netlink_send(struct sock *sk, struct sk_buff *skb);
extern int cap_netlink_recv(struct sk_buff *skb, int cap);
#ifdef CONFIG_MMU
extern unsigned long mmap_min_addr;
extern unsigned long dac_mmap_min_addr;
#else
#define dac_mmap_min_addr 0UL
#endif
/*
* Values used in the task_security_ops calls
*/
@ -121,6 +126,7 @@ struct request_sock;
#define LSM_UNSAFE_PTRACE 2
#define LSM_UNSAFE_PTRACE_CAP 4
#ifdef CONFIG_MMU
/*
* If a hint addr is less than mmap_min_addr change hint to be as
* low as possible but still greater than mmap_min_addr
@ -135,6 +141,7 @@ static inline unsigned long round_hint_to_min(unsigned long hint)
}
extern int mmap_min_addr_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
#ifdef CONFIG_SECURITY

View file

@ -1214,6 +1214,7 @@ static struct ctl_table vm_table[] = {
.proc_handler = proc_dointvec_jiffies,
},
#endif
#ifdef CONFIG_MMU
{
.procname = "mmap_min_addr",
.data = &dac_mmap_min_addr,
@ -1221,6 +1222,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = mmap_min_addr_handler,
},
#endif
#ifdef CONFIG_NUMA
{
.procname = "numa_zonelist_order",

View file

@ -221,6 +221,7 @@ config KSM
config DEFAULT_MMAP_MIN_ADDR
int "Low address space to protect from user allocation"
depends on MMU
default 4096
help
This is the portion of low virtual memory which should be protected

View file

@ -8,7 +8,8 @@ subdir-$(CONFIG_SECURITY_SMACK) += smack
subdir-$(CONFIG_SECURITY_TOMOYO) += tomoyo
# always enable default capabilities
obj-y += commoncap.o min_addr.o
obj-y += commoncap.o
obj-$(CONFIG_MMU) += min_addr.o
# Object file lists
obj-$(CONFIG_SECURITY) += security.o capability.o