Very small patch to 0.99pl12
I hate to put out patches this soon after a release, but there is one
potentially major problem in pl12 which is very simple to fix.. I'm
including patches: both in plain ascii and as a uuencoded gzip file
(it's the same patch - the uuencoded one is in case there is any
newsserver that messes up whitespace).
The main patch is just the change from __get_free_page(GFP_BUFFER) into
get_free_page(GFP_KERNEL), and the two minor patches just add checks
that actually enforce the read-only nature of current file mmap'ings so
that any program that tries to do a write mapping at least will be told
that it won't work.
I'd suggest anybody compiling pl12 should add at least the file_table.c
patch: thanks to Alexandre Julliard for noticing this one.
Linus
diff --git a/fs/file_table.c b/fs/file_table.c
index 8542dd9..df0ae4a 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -45,7 +45,7 @@
struct file * file;
int i;
- file = (struct file*) __get_free_page(GFP_BUFFER);
+ file = (struct file *) get_free_page(GFP_KERNEL);
if (!file)
return;
diff --git a/fs/nfs/mmap.c b/fs/nfs/mmap.c
index e1b13fb..24df306 100644
--- a/fs/nfs/mmap.c
+++ b/fs/nfs/mmap.c
@@ -50,6 +50,8 @@
{
struct vm_area_struct * mpnt;
+ if (prot & PAGE_RW) /* only PAGE_COW or read-only supported now */
+ return -EINVAL;
if (off & (inode->i_sb->s_blocksize - 1))
return -EINVAL;
if (len > high_memory || off > high_memory - len) /* avoid overflow */
diff --git a/mm/mmap.c b/mm/mmap.c
index 60942be..cec3eb2 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -197,6 +197,8 @@
extern struct vm_operations_struct file_mmap;
struct buffer_head * bh;
+ if (prot & PAGE_RW) /* only PAGE_COW or read-only supported right now */
+ return -EINVAL;
if (off & (inode->i_sb->s_blocksize - 1))
return -EINVAL;
if (len > high_memory || off > high_memory - len) /* avoid overflow */
