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authorDave Kleikamp <shaggy@linux.vnet.ibm.com>2008-07-08 00:28:51 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-09 16:30:45 +1000
commitb845f313d78e4e259ec449909e3bbadf77b53a6d (patch)
tree03239e77dbc43f627ce112963736c8b4c53117e6 /mm
parente5093ff05d36c64e8f36a9ddb26358256dc133ea (diff)
downloadop-kernel-dev-b845f313d78e4e259ec449909e3bbadf77b53a6d.zip
op-kernel-dev-b845f313d78e4e259ec449909e3bbadf77b53a6d.tar.gz
mm: Allow architectures to define additional protection bits
This patch allows architectures to define functions to deal with additional protections bits for mmap() and mprotect(). arch_calc_vm_prot_bits() maps additonal protection bits to vm_flags arch_vm_get_page_prot() maps additional vm_flags to the vma's vm_page_prot arch_validate_prot() checks for valid values of the protection bits Note: vm_get_page_prot() is now pretty ugly, but the generated code should be identical for architectures that don't define additional protection bits. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mmap.c5
-rw-r--r--mm/mprotect.c2
2 files changed, 4 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 3354fdd..1d102b9 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -72,8 +72,9 @@ pgprot_t protection_map[16] = {
pgprot_t vm_get_page_prot(unsigned long vm_flags)
{
- return protection_map[vm_flags &
- (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+ return __pgprot(pgprot_val(protection_map[vm_flags &
+ (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) |
+ pgprot_val(arch_vm_get_page_prot(vm_flags)));
}
EXPORT_SYMBOL(vm_get_page_prot);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index a5bf31c..ecfaa58 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -239,7 +239,7 @@ sys_mprotect(unsigned long start, size_t len, unsigned long prot)
end = start + len;
if (end <= start)
return -ENOMEM;
- if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM))
+ if (!arch_validate_prot(prot))
return -EINVAL;
reqprot = prot;
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