[CVE-2009-0029] System call wrappers part 13

[~andy/linux] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index f3555fb806d39f17fa663de470a3a08a765133a3..23acefe51808fdf0b8ed7ec3a7a5c92ee424cad1 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -460,7 +460,7 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
        VM_BUG_ON(!PageLocked(page));
 
        error = mem_cgroup_cache_charge(page, current->mm,
-                                       gfp_mask & ~__GFP_HIGHMEM);
+                                       gfp_mask & GFP_RECLAIM_MASK);
        if (error)
                goto out;
 
@@ -741,7 +741,14 @@ repeat:
                page = __page_cache_alloc(gfp_mask);
                if (!page)
                        return NULL;
-               err = add_to_page_cache_lru(page, mapping, index, gfp_mask);
+               /*
+                * We want a regular kernel memory (not highmem or DMA etc)
+                * allocation for the radix tree nodes, but we need to honour
+                * the context-specific requirements the caller has asked for.
+                * GFP_RECLAIM_MASK collects those requirements.
+                */
+               err = add_to_page_cache_lru(page, mapping, index,
+                       (gfp_mask & GFP_RECLAIM_MASK));
                if (unlikely(err)) {
                        page_cache_release(page);
                        page = NULL;
@@ -950,7 +957,7 @@ grab_cache_page_nowait(struct address_space *mapping, pgoff_t index)
                return NULL;
        }
        page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~__GFP_FS);
-       if (page && add_to_page_cache_lru(page, mapping, index, GFP_KERNEL)) {
+       if (page && add_to_page_cache_lru(page, mapping, index, GFP_NOFS)) {
                page_cache_release(page);
                page = NULL;
        }
@@ -1367,7 +1374,7 @@ do_readahead(struct address_space *mapping, struct file *filp,
        return 0;
 }
 
-asmlinkage ssize_t sys_readahead(int fd, loff_t offset, size_t count)
+SYSCALL_DEFINE(readahead)(int fd, loff_t offset, size_t count)
 {
        ssize_t ret;
        struct file *file;
@@ -1386,6 +1393,13 @@ asmlinkage ssize_t sys_readahead(int fd, loff_t offset, size_t count)
        }
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_readahead(long fd, loff_t offset, long count)
+{
+       return SYSC_readahead((int) fd, offset, (size_t) count);
+}
+SYSCALL_ALIAS(sys_readahead, SyS_readahead);
+#endif
 
 #ifdef CONFIG_MMU
 /**