diff options
| author | Eric Paris <eparis@redhat.com> | 2007-12-19 13:59:32 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-08 12:01:43 -0800 |
| commit | a0209f336a1dff0363b558a972eb71eef74e0084 (patch) | |
| tree | 4f2afc5e7f0ac562a27ea9ba6c46fda7ca72997e | |
| parent | f6055bdd46a2b964f09d02056a251bbf5a8ce9ef (diff) | |
VM/Security: add security hook to do_brk (CVE-2007-6434)
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>
| -rw-r--r-- | mm/mmap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 0d40e66c841b..5c214334d89e 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1938,6 +1938,10 @@ 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); |