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Staging: android: binder: Fix use-after-free bug

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binder_update_page_range could read freed memory if the vma of the
selected process was freed right before the check that the vma
belongs to the mm struct it just locked.

If the vm_mm pointer in that freed vma struct had also been rewritten
with a value that matched the locked mm struct, then the code would
proceed and possibly modify the freed vma.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arve Hjønnevåg 2012-03-08 15:43:36 -08:00 committed by Greg Kroah-Hartman
parent 06caa4174e
commit 2a90957f2c
1 changed files with 4 additions and 1 deletions
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5
drivers/staging/android/binder.c
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@ -288,6 +288,7 @@ struct binder_proc {
struct rb_root refs_by_node;
int pid;
struct vm_area_struct *vma;
struct mm_struct *vma_vm_mm;
struct task_struct *tsk;
struct files_struct *files;
struct hlist_node deferred_work_node;
@ -633,7 +634,7 @@ static int binder_update_page_range(struct binder_proc *proc, int allocate,
if (mm) {
down_write(&mm->mmap_sem);
vma = proc->vma;
if (vma && mm != vma->vm_mm) {
if (vma && mm != proc->vma_vm_mm) {
pr_err("binder: %d: vma mm and task mm mismatch\n",
proc->pid);
vma = NULL;
@ -2776,6 +2777,7 @@ static void binder_vma_close(struct vm_area_struct *vma)
(vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
(unsigned long)pgprot_val(vma->vm_page_prot));
proc->vma = NULL;
proc->vma_vm_mm = NULL;
binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
}
@ -2858,6 +2860,7 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
barrier();
proc->files = get_files_struct(proc->tsk);
proc->vma = vma;
proc->vma_vm_mm = vma->vm_mm;
/*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n",
proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/