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| author | Rusty Russell <rusty@rustcorp.com.au> | 2013-04-22 14:10:38 +0930 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2013-04-22 15:31:36 +0930 |
| commit | 93a2cdff98243df06bafd3c4f3b31b38f0d0fe3e (patch) | |
| tree | cfda9a918a92ac0308e1c888489c83c0b243138a /drivers/lguest/core.c | |
| parent | 856c608827928d29f80605e85fc3f8f0ab3af4fb (diff) | |
| download | linux-93a2cdff98243df06bafd3c4f3b31b38f0d0fe3e.tar.bz2 | |
lguest: assume Switcher text is a single page.
ie. SHARED_SWITCHER_PAGES == 1. It is well under a page, and it's a
minor simplification: it's nice to have *one* simplification in a
patch series!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/core.c')
| -rw-r--r-- | drivers/lguest/core.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index 211d8267992b..4209065b9b1e 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -52,6 +52,13 @@ static __init int map_switcher(void) * easy. */ + /* We assume Switcher text fits into a single page. */ + if (end_switcher_text - start_switcher_text > PAGE_SIZE) { + printk(KERN_ERR "lguest: switcher text too large (%zu)\n", + end_switcher_text - start_switcher_text); + return -EINVAL; + } + /* * We allocate an array of struct page pointers. map_vm_area() wants * this, rather than just an array of pages. @@ -326,7 +333,7 @@ static int __init init(void) goto out; /* Now we set up the pagetable implementation for the Guests. */ - err = init_pagetables(switcher_pages, SHARED_SWITCHER_PAGES); + err = init_pagetables(switcher_pages); if (err) goto unmap; |