On Fri, Jul 15, 2005 at 10:53:33AM -0500, Justin M. Forbes wrote:
> That said, I will be testing this patch a bit further
Thanks. Let me know if you see any issues.
> myself, and because it does address a real memory leak issue, we should
> consider it or another fix for stable 2.6.12.4.
Appended patch will just fix the memory leak issue. Atleast, we should
apply this.
thanks,
suresh
--
malicious 32bit app can have an elf section at 0xffffe000. During
exec of this app, we will have a memory leak as insert_vm_struct() is
not checking for return value in syscall32_setup_pages() and thus not
freeing the vma allocated for the vsyscall page.
Check the return value and free the vma incase of failure.
Signed-off-by: Suresh Siddha <[email protected]>
--- linux-2.6.12.2/arch/x86_64/ia32/syscall32.c.orig 2005-06-29 16:00:53.000000000 -0700
+++ linux-2.6.12.2/arch/x86_64/ia32/syscall32.c 2005-07-15 18:09:06.684409144 -0700
@@ -57,6 +57,7 @@
int npages = (VSYSCALL32_END - VSYSCALL32_BASE) >> PAGE_SHIFT;
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
+ int ret;
vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
if (!vma)
@@ -78,7 +79,11 @@
vma->vm_mm = mm;
down_write(&mm->mmap_sem);
- insert_vm_struct(mm, vma);
+ if ((ret = insert_vm_struct(mm, vma))) {
+ up_write(&mm->mmap_sem);
+ kmem_cache_free(vm_area_cachep, vma);
+ return ret;
+ }
mm->total_vm += npages;
up_write(&mm->mmap_sem);
return 0;
-
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