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| author | Siddha, Suresh B <suresh.b.siddha@intel.com> | 2005-07-15 19:17:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-15 22:56:11 -0700 |
| commit | 9fb1759a3102c26cd8f64254a7c3e532782c2bb8 (patch) | |
| tree | b14426c49283b114594454c19168b84fd6cee4d8 | |
| parent | d6e1860312cd8c33ad1f17d1af22fb6aa1f2cf83 (diff) | |
| download | blackbird-op-linux-9fb1759a3102c26cd8f64254a7c3e532782c2bb8.tar.gz blackbird-op-linux-9fb1759a3102c26cd8f64254a7c3e532782c2bb8.zip | |
[PATCH] x86_64: TASK_SIZE fixes for compatibility mode processes
A 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 <suresh.b.siddha@intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/ia32/syscall32.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86_64/ia32/syscall32.c b/arch/x86_64/ia32/syscall32.c index 01d8db1a1c09..816a3b89f13d 100644 --- a/arch/x86_64/ia32/syscall32.c +++ b/arch/x86_64/ia32/syscall32.c @@ -57,6 +57,7 @@ int syscall32_setup_pages(struct linux_binprm *bprm, int exstack) 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 @@ int syscall32_setup_pages(struct linux_binprm *bprm, int exstack) 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; |
