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authorSiddha, Suresh B <suresh.b.siddha@intel.com>2005-07-15 22:17:44 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-16 01:56:11 -0400
commit9fb1759a3102c26cd8f64254a7c3e532782c2bb8 (patch)
treeb14426c49283b114594454c19168b84fd6cee4d8 /arch/x86_64
parentd6e1860312cd8c33ad1f17d1af22fb6aa1f2cf83 (diff)
[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>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/ia32/syscall32.c7
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)
57 int npages = (VSYSCALL32_END - VSYSCALL32_BASE) >> PAGE_SHIFT; 57 int npages = (VSYSCALL32_END - VSYSCALL32_BASE) >> PAGE_SHIFT;
58 struct vm_area_struct *vma; 58 struct vm_area_struct *vma;
59 struct mm_struct *mm = current->mm; 59 struct mm_struct *mm = current->mm;
60 int ret;
60 61
61 vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL); 62 vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
62 if (!vma) 63 if (!vma)
@@ -78,7 +79,11 @@ int syscall32_setup_pages(struct linux_binprm *bprm, int exstack)
78 vma->vm_mm = mm; 79 vma->vm_mm = mm;
79 80
80 down_write(&mm->mmap_sem); 81 down_write(&mm->mmap_sem);
81 insert_vm_struct(mm, vma); 82 if ((ret = insert_vm_struct(mm, vma))) {
83 up_write(&mm->mmap_sem);
84 kmem_cache_free(vm_area_cachep, vma);
85 return ret;
86 }
82 mm->total_vm += npages; 87 mm->total_vm += npages;
83 up_write(&mm->mmap_sem); 88 up_write(&mm->mmap_sem);
84 return 0; 89 return 0;