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mm: usercopy: move the virt_addr_valid() below the is_vmalloc_addr() 

The is_kmap_addr() and the is_vmalloc_addr() in the check_heap_object()
will not work, because the virt_addr_valid() will exclude the kmap and
vmalloc regions. So let's move the virt_addr_valid() below
the is_vmalloc_addr().

Signed-off-by: Yuanzheng Song <songyuanzheng@huawei.com>
Fixes: 4e140f59d2 ("mm/usercopy: Check kmap addresses properly")
Fixes: 0aef499f31 ("mm/usercopy: Detect vmalloc overruns")
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220505071037.4121100-1-songyuanzheng@huawei.com
This commit is contained in:
Yuanzheng Song 2022-05-05 07:10:37 +00:00 committed by Kees Cook
parent 710e4ebfba
commit a5f4d9df1f
1 changed files with 3 additions and 3 deletions
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6
mm/usercopy.c
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@ -163,9 +163,6 @@ static inline void check_heap_object(const void *ptr, unsigned long n,
{
struct folio *folio;
if (!virt_addr_valid(ptr))
return;
if (is_kmap_addr(ptr)) {
unsigned long page_end = (unsigned long)ptr | (PAGE_SIZE - 1);
@ -190,6 +187,9 @@ static inline void check_heap_object(const void *ptr, unsigned long n,
return;
}
if (!virt_addr_valid(ptr))
return;
folio = virt_to_folio(ptr);
if (folio_test_slab(folio)) {