Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5
Commit:     ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5
Parent:     294a80a8ed004b383ab214837e1c05ca4098a717
Author:     Eric Paris <[EMAIL PROTECTED]>
AuthorDate: Tue Dec 4 23:45:31 2007 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Dec 5 09:21:21 2007 -0800

    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 virtual 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]>
    Cc: Stephen Smalley <[EMAIL PROTECTED]>
    Cc: James Morris <[EMAIL PROTECTED]>
    Cc: Chris Wright <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 mm/mmap.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index facc1a7..acfc13f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1934,6 +1934,10 @@ unsigned long do_brk(unsigned long addr, unsigned long 
len)
        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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