Commit:     5a211a5deabcafdc764817d5b4510c767d317ddc
Parent:     7cd94146cd504016315608e297219f9fb7b1413b
Author:     Eric Paris <[EMAIL PROTECTED]>
AuthorDate: Tue Dec 4 11:06:55 2007 -0500
Committer:  James Morris <[EMAIL PROTECTED]>
CommitDate: Thu Dec 6 00:25:30 2007 +1100

    VM/Security: add security hook to do_brk
    Given a specifically crafted binary do_brk() can be used to get low
    pages available in userspace virtually memory and can thus be used to
    circumvent the mmap_min_addr low memory protection.  Add security checks
    in do_brk().
    Signed-off-by: Eric Paris <[EMAIL PROTECTED]>
    Acked-by: Alan Cox <[EMAIL PROTECTED]>
    Signed-off-by: James Morris <[EMAIL PROTECTED]>
 mm/mmap.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index f4cfc6a..15678aa 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1941,6 +1941,10 @@ unsigned long do_brk(unsigned long addr, unsigned long 
        if (is_hugepage_only_range(mm, addr, len))
                return -EINVAL;
+       error = security_file_mmap(0, 0, 0, 0, addr, 1);
+       if (error)
+               return error;
        flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
        error = arch_mmap_check(addr, len, flags);
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