The patch titled
VM/Security: add security hook to do_brk
has been added to the -mm tree. Its filename is
vm-security-add-security-hook-to-do_brk.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: VM/Security: add security hook to do_brk
From: Eric Paris <eparis@xxxxxxxxxx>
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@xxxxxxxxxx>
Acked-by: Alan Cox <alan@xxxxxxxxxx>
Cc: Stephen Smalley <sds@xxxxxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/mmap.c~vm-security-add-security-hook-to-do_brk mm/mmap.c
--- a/mm/mmap.c~vm-security-add-security-hook-to-do_brk
+++ a/mm/mmap.c
@@ -1946,6 +1946,10 @@ 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);
_
Patches currently in -mm which might be from eparis@xxxxxxxxxx are
git-selinux.patch
vm-security-add-security-hook-to-do_brk.patch
do_wait-cleanup-delay_group_leader-usage.patch
do_wait-fix-security-checks.patch
do_wait-fix-security-checks-fix.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
