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2.6.23-stable review patch. If anyone has any objections, please let us know. ------------------ From: Eric Paris <eparis@redhat.com> patch ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5 in mainline. 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 <eparis@redhat.com> Acked-by: Alan Cox <alan@redhat.com> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: James Morris <jmorris@namei.org> Cc: Chris Wright <chrisw@sous-sol.org> Cc: maximilian attems <max@stro.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- mm/mmap.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1938,6 +1938,10 @@ unsigned long do_brk(unsigned long addr, 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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